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"We're going to have so much fun tonight..."

Jennifer twirled the coiled telephone cord around her finger as she lay on the pink sheets of her bed, the receiver pressed flush against her long equine ear. She was wearing nothing but a pair of pink panties, the bright color contrasting sharply with the Shire horse's light gray coat, mottled with white spots.

"Yeah. Doug's parties are always crazy. It'll be tight," came the reply from the other end of the telephone line.

Jennifer let the phone cord unspool from around her finger as she slid her hand up her bare stomach. She felt the longer fur around her wrist brush against her huge bare breast as she trailed her hand up her torso, up to her exposed black nipple.

"Mmhhh, Brad..." Jennifer sighed into the phone as she squeezed and fondled her bare chest, "Something else'll be tight for you tonight. Use your imagination, in case my mom or my asshole little brother are on the line..."

"Guh-huh-huh," she heard Brad chuckle. "Can't wait babe."

Babe. He called me babe.

Jennifer still couldn't believe she was talking to Brad on the phone. The_Brad, the most popular boy in their entire senior class, probably the most popular boy at all of Chester P. Hooferton High School. _Brad!

Her hand dashed quickly back down her stomach just thinking about it, past her navel to her pink panties. She ran her middle finger over the thin fabric, sliding it along her feminine groove.

"Nnnhh, me neither," she cooed as she vigorously rubbed herself through her underwear. "Wait 'til you see my costume. I'm going as a sexy witch. You're gonna flip."

"Guh-huh-huh, nice," Brad chortled. "Mine's lame as shit, dumb superhero costume 'cause I'm lazy as shit and waited until Halloween day like a dumb-ass. I'm going as SpiderHorse. Probably not 'sexy' like yours."

Sexy. He called me sexy.

Jennifer's hand darted underneath her panties. Unceremoniously she parted the puffy lips of her equine mound and sank her finger into her sex.

"I bet it is... you look sexy no matter what you wear..." she hummed into the receiver as she worked her finger in and out of her pussy.

"Uh-huh, sure," Brad answered brusquely, seemingly distracted. "You'll probably see it tonight anyway."

"_Yeah_I will. I can't wait to see--"

"Hey I'll talk to you later," Brad interrupted. "I'm getting another call on call waiting, see you tonight."

"Oh. Okay Brad, I'll--"

Jennifer heard the click through the phone line as Brad hung up on her.

Neither her mother or her little brother had been listening in on the call from the phone in the kitchen like Jennifer thought they might be, but if her mother had been listening she certainly would have picked up on the dismissive, almost rude way Brad spoke during the one-sided conversation. Even her little brother would have been able to tell Brad didn't feel the same way she did about him, and he was still in the 8thgrade.

But they wouldn't understand. This was Brad. Brad!

To say that Jennifer hadn't been a popular filly growing up would be an understatement. As a draft horse - a Shire no less - she'd always been the biggest girl in her class. This made her the subject or relentless teasing and ostracizing from the other girls when she was in grade school, and the butt of jokes for the boys into high school. They'd called her all kinds of names: Jenn-Heifer, Giant Jenny, Jumbo-fer, to name just a few. She'd spent most of the 9th, 10thand 11thgrades trying and failing to fit in.

By the time she was in the 12thgrade, a senior in high school, she was truly a giant. She was 7'10" tall and she weighed 350 pounds. That didn't make her overweight - she was actually very well proportioned for her size, and in a smaller frame would have been considered athletic and attractive. She just towered over most of her classmates.

But that year, something changed.

She'd reluctantly gone to the first football game of the season with one of her few friends. While they were in the bleachers one of the cool, popular boys in her class - a Friesian who it was widely known_smoked weed_ - started chatting with Jennifer's friend. Soon all her attention was on the boy and Jennifer was all but forgotten. Jennifer watched the game feeling ignored by her friend. She's the only reason I'm ever here, Jennifer thought, and she spends the whole game talking to that pot-head? Well, he is a popular pot-head... but still!

Jennifer tried to distract herself by watching the game, the rules of which she didn't even understand. In actuality she just spent most of the time ogling the boys on the team in their football tights, especially the quarterback - she'd had a crush on him since grade school, but he'd never paid the slightest bit of attention to her.

"A bunch of us are getting together at Brett's house after the game, if you wanna hang out," Jennifer overheard the Friesian saying to her friend, her equine ears twisting unconsciously towards him even as she pretended that she wasn't listening. "His parents are gone and we got a keg."

Ugh, Jennifer sighed. Give me a break, she's not going to...

"Yeah, that sounds great," Jennifer heard her friend say. "But only if Jenn comes too."

"Her?! Jumbo?!" Jennifer heard the Friesian whisper as she kept her eyes on the quarterback on the field. She resisted the urge to turn and give him a mean look. "Fine. But she better not drink the whole keg."

Jennifer found herself tagging along with her friend to the party after the game, protesting mildly on the way there. For the first few minutes she felt horribly out of place, but eventually her friend convinced her to try some beer. She hadn't tried alcohol once in her life before, but soon she was downing cup after red plastic cup of it. The Friesian hadn't been too far off about her and the keg. Within an hour of her arrival at the party she was drunk for the first time.

It ended up being the first of many firsts that night. Almost all the popular boys at Chester P. Hooferton High were at the party, and the more she drank the more it seemed like they actually were actually paying attention to her. Inebriated, her inhibitions abandoned, she found herself in a dark closet with one of them - she didn't know who - making out. Her first kiss!

Then she was in the closet with another. Then another. Then she was in a bedroom with one of them, and he wanted to go further.

In a bedroom at a party with one of the popular boys!

She let him. She sucked him off - her first time! He sprayed his thick seed all over her long equine face. She wiped herself with the bedsheets as he left the room, and as soon as he left another of the popular boys entered. Jennifer could see several more boys lining up outside the bedroom as he shut the door behind him. Was this what it was like to be popular? They were all paying attention to her!

She swallowed the loads of the next three colts, one of whom was the pot-head Friesian who had called her "Jumbo" at the football game and didn't want her to come to the party. She kept her lips wrapped around his thick shaft as the head of his cock flared and his cum poured into her mouth. Swallowing wasn't as messy as the first colt cumming on her face, at least, and she found she didn't mind the taste.

Finally the Friesian who'd both called Jennifer "Jumbo" and gotten a blowjob from her on the same night left the room. He gave a fist-bump to the colt who entered as he left, the last of the boys waiting outside. As he entered the room and shut the door behind him Jennifer couldn't believe who it was.

The quarterback of the football team! He's noticing me!

As he approached her, he slipped his hand into his back pocket and unceremoniously pulled out a condom. Jennifer had no doubt at that moment that he had more on his mind than just a blowjob. But she was still a virgin - well, if she didn't count the four guys whose dicks she'd just sucked. Was this really how she wanted to lose her virginity, to a guy she didn't even know, drunk on cheap beer at some party she wasn't even really invited to?

She didn't hesitate an instant. She dropped her panties, spread her legs and lifted her tail for the young stud. This was the quarterback of the football team! This was her chance! If she let him fuck her she'd be popular for sure!

He only lasted a few minutes before his cock flared in Jennifer's slick pussy, filling the condom with his cum. He didn't think a girl as big as Jennifer could be so tight. He was a big guy, but Jennifer was a giant. Big as the quarterback was, she had a foot and a half on him and a good hundred pounds. He felt like he'd slayed a dragon as he slid his cock out of her pussy, peeled off the full condom and dropped it on the floor, spilling his seed on the carpet. He pulled up his pants and left her alone in the bedroom without saying a word.

After that night things were different for Jennifer. The popular boys that used to make fun of her and call her names started talking to her,flirting with her at school. She started getting invited to parties. It was finally happening! She was one of the popular girls!

Not that the other popular girls seemed to want anything to do with her. They treated her worse, if anything. Instead of ignoring her or calling her Jumbo, they called her even worse names now. Easy Jenny. Sluttifer. Jenni-hoe.

Whatever, Jennifer thought. They're all just jealous. They're all bitches! Yes she had fucked a dozen of the popular boys in the month since that first party, that was true. But so what? That's not why they liked her, she told herself. No way! They just finally realized how cool she was and they all wanted to hang out with her! Even Brad!

Even Brad, she thought after he hung up on her. He actually called me! I was just talking to him on the phone! Just thinking about him had her soaking wet.

She clumsily dropped the phone back onto the receiver, her empty hand again finding her bare breast. She continued playing with herself underneath her pink panties, her fingers parting the black pussy lips that contrasted with the light gray and mottled white of her coat, exploring the soft pink inside.

"Fuck... Brad..." she sighed, thinking about what they would surely be doing tonight at the party. Brad wasn't the biggest or strongest horse in her class; far from it, he was actually rather small for horse his age and breed, a gray-coated Arabian thoroughbred. He was only 5'7" or 5'8", and he couldn't be more than 150 pounds wet. Jennifer absolutely dwarfed him. But he was the most popular boy in the school, the homecoming king, captain of the debate team, voted most popular three years in a row. He was incredibly charismatic and witty and just so cool, cooler even than the other popular boys. He played in a band. He drove a red sports car. His dad was rich. Really rich. All the popular girls wanted him - and most had had him. All the boys just wished they were as cool and popular as he was.

Brad!! He called me!! I was just talking to him!!

And tonight he's going to fuck me!!!

"Fuck me Brad... fuck my pussy..." she moaned with her eyes closed, imagining the diminutive colt's cock inside her as her fingers moved faster. Her pussy began winking - an involuntary genital spasm for female horses when they were extremely aroused - as she brought herself closer to climax.

"Fuck, fuck, fuck, fuck," she whined as she approached orgasm, her hips lifting off the bed. Her fingers slid out of her winking, dripping pussy and shot to her clit, rubbing frantically, almost violently. At the same time her other hand darted from her heavy, heaving breasts to one of the pillows on the bed.

"Ahhhmmmmmmmm!!!" she screamed into the pillow as she reached her crashing, quivering orgasm. Juices from her plump horse pussy squirted onto her hand and soaked her pink panties.

Jennifer moaned again into her pillow, then whimpered into it as her orgasm subsided. She panted heavily as she removed the pillow from her face. She turned her long equine face to the side, seeing the dozens of band posters she had tacked to the walls of her bedroom. Backstreet Colts, Notorious H.O.R.S.E., Spice Fillies, Dr. Neigh, Mare Lynn Manson - she didn't really like any of the music, but she listened to it anyway because it was what the popular group at her school listened to.

She looked down her immense body at her drenched panties. She'd be just that wet for Brad tonight at Doug's Halloween costume party. She'd be cumming with his cock deep inside her in a matter of hours.

Better get cleaned up, she thought.

• -

Matt heard the shower in the bathroom that connected his room and his sister Jennifer's room turn on.

"We just got home from school, why do you need to take a shower now..." he muttered as he sat on the edge of his bed, controller in his hands.

He was playing a new game on his Pretendo 64 that had just come out last month: GoldenRye. He'd beaten it on Agent and Secret Agent already, and he'd probably be able to beat it on the hardest difficulty tonight if nothing came up.

His friend Billy had talked about going trick-or-treating, but he was way too old for that now. He would be in high school next year! He was 14 years old! Come on, he'd told Billy at school today, we can think of something better to do on Halloween. Let's just play some GoldenRye or something. Billy said he might, but also that there might be something else going on tonight and that he'd call Matt later when he found out.

Ring-ring! Ring-ring!

The landline phone started ringing.

"I'll get it!" Matt yelled, even though his mom was still at work and his sister was in the shower. He paused the P64 and ran out of his room into the kitchen. He was hoping it was Billy inviting him over to his house to play some GoldenRye.

"Hello?" he said into the receiver.

"Hey, is Jennifer there?" the voice on the other end of the phone said. It wasn't Billy. It was an older-sounding boy... Matt's sister never got calls from boys until last month, but now they called all the time. Whatever, he thought.

"She's in the shower. This is Matt."

"Oh. You her little brother?"

"...Yeah."

"Okay well, can you give her a message? This is Brad, can you tell her I won't be at Doug's party tonight? I uh... something else came up and umm... can you just tell her I'm like, sick or something?"

"Sure," Matt said, only half listening.

"Sweet, thanks little dude, you rock!"

Matt heard the click as whoever that guy was hung up. Guys were always leaving messages for his sister now but he wasn't her messaging service. Disappointed that it wasn't his friend inviting him over to play video games, he went back to his room and picked up his controller. After a few minutes engrossed in the game he'd forgotten all about the phone call. If Natalya would quit running into the control room he could beat this level on the hardest difficulty!

Matt's equine ear swiveled as he heard the shower turn off. He paused the game and jumped over to his bedroom door, closing it quietly.

Matt had never really gotten along with his sister. They'd always had a sort of simmering disgust and dislike for each other going back as long as either of them could remember. In fact, it wouldn't be unfair to say they had an actual hatred for each other. But Matt was 14 years old, and like all 14 year old colts he was horny.

Like, all the time.

And his sister was hot.

He was aware that not everyone would agree_that his sister was hot. She was, undeniably, gigantic. But for whatever reason, Matt loved bigger mares. Not _fat_mares, which his sister most definitely wasn't. Just _big mares. Perfectly proportioned_big_ mares with enormous tits, a thick ass and muscular thighs like tree trunks. Mares that looked just like his sister.

He figured he probably liked big mares because of his breed. He was, obviously, the same breed as his sister: a Shire, one of the largest breeds of horse in the world. It was in his genes to like big mares, and that would have been fine and well if he was as big as his breed would suggest he should be.

But he wasn't. His mom said he wasn't finished growing, that he hadn't hit his big growth spurt yet. Maybe that was true, but at 5'7" and only 140 pounds he was way, way smaller than a draft horse should be at his age. He imagined how ridiculous it would look if he ever had sex with a large mare. And you've got to kiss one first, he reminded himself; you've never even done that.

He may have looked a lot like his sister, his light gray coat with mottled white spots nearly identical and their faces very similar, but she was more than two feet taller, and more than two hundred pounds heavier.

And hot as fuck.

He'd felt guilty about it the first time he'd done it, but now every time his sister took a shower he'd crouch down on his bedroom floor, press his face to the carpet and peek under the door to the bathroom they shared. If he timed it right, he could catch her stepping out of the shower and drying off with the towel. It was like a free stripper show! Stripper tease? He didn't know what they were called, but he got to see a naked mare!

Matt told himself that's what it was, that it was just the fact that he got to see a hot mare naked and that it had nothing to do with the fact that she was his sister. It's like looking at any other naked girl, he told himself. But more and more he found that when he jacked off, he wasn't just thinking about a mare that _looked_like his sister. He was thinking about his actual sister.

He couldn't deny that this was true last week, when Jennifer gave him the best show ever. She didn't just dry off after the shower, she spent a good 20 minutes checking herself out in the mirror, striking alluring and erotic poses. Matt may have been small for his age and his breed, but his equine cock certainly wasn't, and as he watched his sister from the crack under the door all 14 inches of it was rock hard. Even when compared to other horses - well known to other species for their enormous dicks - Matt's was huge. When paired with his diminutive body it was almost comically large.

He found himself unzipping his cargo shorts after most of his length had emerged past the waistband. Thick and black with mottled, irregular pink splotches, his horse cock was flush against his stomach, the cockhead almost reaching his own black nipples. It dropped heavily to the carpet when he freed it from his pants.

Matt jacked himself as he watched his naked sister, his heavy, leathery black ballsack jiggling with each stroke, each testicle the size of a tennis ball. Thoughts of how wrong this all was had long fled his mind. When she bent over with her ass facing him he got a good, long look at her slick black pussy, and under her raised tail he could see her black, donut-like equine tailhole that looked just like a larger version of his own. He'd immediately finished himself off at the sight of his sister's nethers, blasting an enormous pool of cum directly on the carpet as the head of his horse cock flared. But even then he couldn't stop ogling her until she went back into her room.

Now, a week later, he was peeking under the bathroom door again like he did every time he heard the shower turn off, hoping for another glimpse of his sister's ass, pussy and tits. He'd gotten a few brief glimpses since that amazing spectacle last week, but nothing that compared to that extended show.

And it was driving him nuts.

That strip-show was the last time he'd cum. He'd more or less been edging himself for the past week, hoping that he'd get another long look as his naked sister to masturbate to, but he never did. Every time she walked back into her bedroom and out of sight he thought about finishing himself off, but he kept telling himself that _next time, next time_she'll do it, and when he cums after so long without jacking off it'll be so, so good. Now that it had been seven days he was more pent up than he had ever been. He knew when he finally did cum it would be incredible, both in intensity and in quantity.

There she is!

Matt saw his sister's hoof as she stepped out of the shower. He was stroking his cock as he watched, face pressed against the carpet and door. Her leg came into view, hot water dripping off her meaty, muscular thighs.

"Come on, come on," he whispered, masturbating furiously now. Just walk over to that mirror. Do it again. Do it again!

No! She went straight for the towel!

Matt saw the side of his sister's ass, _maybe_a little side-boob, but that was it. And just as quickly as she had stepped out of the shower, she wrapped her towel around herself and went back into her room.

"No, no!" Matt whispered under his breath. "Bitch! fucking bitch..."

He was squeezing his glans, the very head of his cock, a technique that he knew could trigger his orgasm in seconds if he did it just the right way. His equine cockhead would flare wide like an opening umbrella if he went just a little further, shooting thick jets of cum into his palm. But that wouldn't be as good! He wanted to do it while looking at his sister! So while he wanted desperately to finish, he held off.

A_week_ since he'd jacked off, he thought as he stood back up. That's got to be some kind of a record. And not in a good way. But that last time had been so good - it would be worth it. Next time she put on a show, it'll be worth it.

He pushed himself up off the floor and stood up on his hooves before dropping his pants. He had to readjust; his erect shaft was still jutting straight up along his stomach. With his pants around his ankles he grabbed it and pointed the cumbersome shaft downward instead. He held his cock firmly to the side of his right thigh as he pulled his pants back up, directing it through the right pant leg before zipping and buttoning his pants again.

Ugh, it's going to stay hard for a while he thought as he sat back down on the edge of his bed and picked his controller back up, feeling the length of his enormous horse cock pressed against his shorts, desperate to swing free. But just as he was about to unpause the game and try again to finally beat this level, he noticed that the head of his rock-hard cock was actually sticking out of the bottom of his cargo shorts - it was all the way to his knee.

Shit, he thought as he wrapped his fingers around it again and started massaging it, maybe I should just crank one out real quick. This is getting ridiculous.

But he didn't have the chance.

The door to his bedroom began opening. Matt quickly lifted his hooves and crossed them, sitting cross-legged on the edge of his bed in an attempt to hide his erection and the head of his equine cock sticking out the bottom of his shorts. His hands shot into his lap to cover it with the large, three-handled P64 controller as his sister barged into his room.

"What are you doing..." she asked in a tone that was equal parts accusatory and dismissive, which was not at all atypical.

"Playing video games. What are you doing in my room?"

"Can I borrow 20 bucks?"

Matt sighed. Jennifer had 'borrowed' at least $200 from him over the past year, repaying none of it. What does she spend her money on, anyway? Probably booze, if the rumors he'd heard in the past month at school were true. Probably condoms if some of the other rumors were true.

He paused the game and turned to her, only then noticing what she was wearing. What she _wasn't_wearing. She had her bathroom towel wrapped around her body, the same one he'd seen her put on when he was peeking under the door. The hair of her mane was still soaking wet. His mind went blank at the sight of this gorgeous mare in his bedroom, but only for a second. This was still his mean, selfish sister, after all.

"No! You _cannot_borrow 20 bucks! You never paid me back for the last time!"

Jennifer eyed the nightstand next to his brother's bed where she knew he kept his money. She'd _borrowed_some of his money a few times before without telling him, the times she couldn't get to their mom's purse.

"Fine then, I'll just take it," she said defiantly as she confidently strode into her brother's room.

"Hey! You can't do that!" Matt yelled at her as she opened the drawer. He wanted to stand up, but his cock was still rock hard and partially protruding from his shorts, hidden only slightly by the controller in his hands.

"You gonna stop me?" Jennifer chided as she reached into the drawer and grabbed her brother's money. She knew he wouldn't. She knew he_couldn't_, to be more accurate. The last time he'd tried to stand up to her physically she all but threw him across the room. More than two feet taller and almost three times his weight, she could fling him like a ragdoll if she wanted to and they both knew it.

"I'll tell mom!"

"Aww, widdle baby brother gonna tattle to mommy," Jennifer mocked as she closed the drawer. "See? Twenty."

She held the money in front of Matt's face.

"I'll pay you back, quit being such a baby."

She turned to leave the room. Matt's mind again temporarily went blank - it had a tendency to do that when he was horny - as he watched her massive, meaty ass sway under the towel while she walked to his door. But then he snapped out of it, remembering it was his sister.

"Bitch!" He yelled at her.

"Dork!" She snapped back, turning around to look at him again.

"Jumbo!" Matt screamed. That would make her mad, he knew, but he was mad too.

"Loser! I'm hanging out with all the cool kids_tonight, and what are you doing? Playing video games? You're such a fucking pathetic lame-ass _loser!!"

Matt could see how pissed off his sister was, her nostrils flaring and anger in her eyes. But he was pissed too. She can't just come in here and steal from me!

He knew she'd probably kick his ass if he said it, but if these new rumors were true, if there was anything behind these new insults he'd heard about her...

"Jenni-hoe!"

Matt heard a frenzied bray as his sister lunged at him.

"Where did you hear that?!" she screamed as she grabbed his throat and pushed him down into the bed. "Who told you that?!"

"Grah... kk... can't... brea--" Matt gasped. Jennifer loosened her grip, loose enough to allow him to talk but still tight enough to keep him pinned to his bed. "Some k-k-... kids at school!"

Jennifer's nostrils flared again. She snorted hard enough for Matt to feel the hot air on his face.

"Don't you ever call me that again, you hear me! Call me that again and you're fucking dead!"

She let go of her brother's neck, but she was still pissed off. Ugh, she thought, my fucking idiot, asshole little brother! Little shit, I hate him! What can I do to really show him I mean business, to _really_get him back for what he just said...

She saw the Pretendo 64 controller laying on the ground, dropped by her brother when she grabbed his neck. She grinned deviously as she picked it up.

Matt was trying to catch his breath when he saw, all at once, his sister's immense ass crash down on his stomach and chest.

"Oof!" he winced as Jennifer dropped her full weight on him. Again he could barely breathe as the bed sagged under his sister's weight.

"Ooh, durr, look at me, I'm dumb dork Matt," Jennifer mocked in a silly voice as she unpaused the game. "Durr, durr, I play stupid video games all day because I'm a retard loser with no life, durr."

Jennifer hadn't really ever played video games before. She spun the P64 controller's joystick in circles while holding the-trigger button on the back, spinning the character around and shooting wildly.

"Durr I suck, durr-durr."

Matt barely heard her. He wasn't thinking about how she was ruining his progress on the level, getting his character killed in GoldenRye. He wasn't thinking about how much his chest and stomach were hurting with the weight of his sister on them. He wasn't thinking at all. His mind was blank.

In front of him, just inches from his nostrils, was his sister's bare, exposed ass.

Her towel must have hiked up when she sat on him. It was above her tail, which was lifted just enough for Matt to see the her huge black donut of a tailhole. And there, right below it, resting on his chest, was his sister's pussy.

Without thinking he reached up, grabbing his sister's enormous bare ass. He felt the heat of her skin underneath her short gray fur. His hand moved as if out of his control towards his sister's tailhole and pussy. It was right there, right there in front of his face.

"Durr, I died."

Jennifer lifted herself off of her brother after she got his character killed in GoldenRye. As she did, Matt got an even better look at his sister's privates before the towel covered it again. At the same time he felt her inner thigh brush against his erect cockhead, still sticking out of the bottom of his cargo shorts.

Had she not noticed at all? Matt watched as she dropped the controller to the ground and started to walk away, pulling his shorts down at the same time to cover his exposed cockhead. Did she not feel it? Did she not feel him groping her ass? Maybe she thought he was just trying to push her off?

"Thanks for the money, loser," Jennifer said to a bewildered Matt without turning around. She was about to leave his room, but paused for a second before she did.

"Whoops," she sneered as she pushed Matt's Pretendo 64 off the table. It crashed to the floor as the television screen blinked from the GoldenRye death screen to black.

Normally Matt would have yelled something at her as she left his room, but he was still in too much shock from what had happened to form any kind of response. He could only stare blankly at her huge, pert ass swaying underneath the bathroom towel as she walked away.

• -

Matt was glad he had a Pretendo 64 instead of a Pony NeighStation. The tumble that his gaming console took when his sister pushed it off the table would definitely have broken a NeighStation, but the P64 was built like a tank. It turned right back on like nothing ever happened.

It was almost 10 o'clock on Halloween night now. Matt was a little disappointed that his friend Billy had never called him about whatever it was that might be going on tonight, but it was fine. He'd spent a few hours helping his mom hand out candy to trick-or-treaters, and he had a lot more fun doing that than he thought he would.

As much as he hated his sister he loved his mom; he really was a momma's boy deep down, and he always enjoyed spending time with his mom when Jennifer wasn't there. Jennifer left for some sleepover at one of her friend's houses or something a few hours ago, so it was just Matt and his mom in the house now.

Their parents - high school sweethearts - had gotten divorced when Matt was still very young. Matt had only ever even met his father a handful of times. Now that Matt was a little older their relationship had turned more into a friendship than a traditional mother and son would be - if Matt was a little more observant or experienced with women he would notice that sometimes his mother took things to a decidedly inappropriate, flirtatious level with her only son who was rapidly growing into a young man.

The trick-or-treaters had stopped showing up about an hour ago and his mother was in the shower now getting ready for bed. Matt had made some more progress on GoldenRye and thought he might be able to beat the game on the hardest difficulty this weekend, maybe even tonight. He had almost totally forgotten about Billy calling him when the phone rang.

Ring-ring!

"I'll get it!" Matt yelled.

He ran to the kitchen and picked up the phone.

"Hello?"

"Hey Matt!" the voice on the other end of the receiver said enthusiastically.

"Oh, hey Billy! I didn't think you'd be calling this late."

"Yeah! Well hey that thing I was talking about earlier is happening!"

Matt was confused. Billy had told him there might be something going on tonight, but he'd never told him what it was.

"What are you talking about?" Matt asked.

"There's a party a few houses down from mine! A Halloween party! I scoped it out and it's a bunch of the cool high schoolers!"

"Billy, I don't know..." Matt started.

"And they have a keg! And there's lots of hot girls there!"

"And we're not invited," Matt rebutted. "They'd just kick us out."

"That's the beauty of it," Billy answered with a mischievous tone. "It's a _costume_party. If we're wearing costumes they won't know that we're still in middle school."

Matt thought for a moment. Maybe this _would_be better than spending the rest of the night playing video games. If it was near Billy's house, what did he have to lose? He could bike there in 10 minutes. And he _did_still have that old SpiderHorse costume in his closet from several years ago, the one that was basically a full-body suit that covered everything up, even his face.

He felt his horse cock pressing against his cargo shorts. He'd never really gone soft from what happened earlier with his sister, even when he was handing out candy with his mom. He hoped she hadn't noticed. Still, it had been a week since the last time he'd jacked off, and his lack of release was clouding his mind.

"And you said there's girls there?" He asked Billy, his other hand feeling his erection through his pants.

"_Lots_of girls. Really hot high school girls," Billy answered.

"Okay. I'm in," Matt said. "What's the address?"

• -

This might have been a mistake.

The trouble started for Matt almost immediately. The SpiderHorse costume he'd had in his closet was the one he'd worn trick-or-treating when he was a kid. It was way too small for him now. The mask was tight over his whole head and face. He could barely breathe in the thing, and it pinned his ears down and back so that everything he heard sounded muffled and distant.

Then there was his vision - there a kind of mesh material over his eyes and he could barely see anything at all through it. He crashed his bike twice trying to ride from his house to the party before taking the mask off entirely. He put it back on when he got to the party, but it was almost impossible to see anything with detail through the mesh.

He hid his bike in the bushes when he arrived, but as soon as he put the mask back on he realized another thing was wrong with his costume: it wasn't just tight, it was skin-tight. His fist-sized balls and enormous cock, still semi-erect from earlier events and a week without release, were plainly outlined underneath. He adjusted his huge shaft so that it trailed down one of his thighs, trying to curve it so it stayed on the side instead of the front underneath the thin fabric.

He cautiously walked to the front door. From the front yard he could hear the music playing loudly in the house. He could also hear muffled whoops, chatter, and laughter from the party-goers inside. The door was wide open. After one more look around he walked in.

He bumped into a table as soon as he was inside. The vase on it wobbled precariously before settling again. He hadn't even seen it through the mask! He was half expecting one of the high-schoolers inside to notice him and throw him out immediately, but it was far too loud inside the house and no one seemed to notice him.

He wandered through the foyer and into the living room. There were about a dozen high-schoolers playing beer pong and drinking games, all of them wearing alternately garish and skimpy Halloween costumes. One of the guys playing, a Friesian, nodded his head at Matt.

"Hey Spider-brah, we need another for beer pong, you play?" he asked as Matt nearly walked into a couch.

"No I... no thanks..." Matt replied, his voice distorted by his mask. He realized how it must have sounded as soon as he said it. No thanks? These are cool high-schoolers at a real party! They're going to know for sure that you're a dorky middle-school kid if you talk like that!

"All right little Spider-dude I feel you. You do you. Keg's in the back yard, help yourself. Get loose, shake off those cobwebs!"

Matt heard muffled laughter from the horses around the Friesian, but they turned back to their drinking game as he made his way through the living room to the back yard. That was where most of the noise was coming from - Matt figured if he was going to meet up with Billy then he'd probably be back there. If not... well, he'd probably just turn around and head home if he couldn't find Billy.

But as he opened the door to the back yard and stepped outside he had a realization: Billy had never told him what costume he would be wearing. How would he ever recognize him? Billy certainly wouldn't be able to tell who he was in his SpiderHorse costume. This was stupid, Matt thought. I should probably just go home. And he was on the verge of turning around and doing just that when he saw it. When he saw them.

Tits!

He couldn't be totally sure looking through the mesh of his costume, but he _thought,_he was _almost certain_that several of the horses playing in the pool were females, and that they were topless. There were dozens of high-schoolers partying in the back yard, lots around the keg but even more watching the shenanigans taking place inside the large swimming pool. When the young fillies in the pool squealed in delight, splashing and playing, he was certain.

Those are girls! Naked girls in the pool!

He took another few steps towards the edge of the pool in a lust-fueled daze, his hooves moving as if by themselves. He could barely see the naked fillies through his costume but he could see enough, their breasts bouncing in the water with every move. His semi-erect horse cock began firming again, slinking further down his leg and puffing the thin fabric of his costume. His mind was blank.

"_There_you are!" he heard from behind him as strong arms wrapped around his body.

• -

Jennifer was beginning to give up hope that Brad would show up to the party. He was habitually late to these parties of course - too cool to show up on time - but she'd been here for nearly two hours and he still hadn't arrived. Had he stood her up? Did she put on this sexy witch costume for nothing? Would she miss her big chance to fuck the most popular colt at Chester P. Hooferton High?

That wasn't to say she'd been idle at the party since she got there a few hours ago. Far from it. She'd had about 8 beers from the keg (it took a lot for someone her size to get drunk, she'd found) and made out with one of the football players she'd fucked at a party last weekend. He'd groped her all over, his hands feeling the form beneath the black costume corset she was wearing as part of her witch costume. He explored under her black skirt finding that she wasn't wearing any panties - a surprise intended for Brad. He'd asked her to go to one of the bedrooms, and she would have said yes if she wasn't waiting for...

Brad! There he is!!

Jennifer started trotting briskly from the keg towards him. Even in that SpiderHorse costume he told her he'd wear she could recognize it was Brad; his small stature was unmistakable among all the other high school horses. He must have just walked out of the house, standing by the pool watching the naked swimmers. That's so Brad!

She was just a few yards from him when she noticed the conspicuous bulge in his SpiderHorse costume. Her eyes fell on the obvious outline of his cock snaking down his leg beneath the skin-tight fabric of his costume. Oh my god, she thought the rumors are true! He's huge!

"_There_you are!" she cooed as she approached Brad from behind, wrapping her arms around his body. "I was worried you weren't going to come..."

"I... ummm...!" she heard the muffled, distorted voice behind the mask say.

"And you're almost ready to come for me again, I see..." she said as her hand trailed down Brad's stomach, down to the bulge in his costume. She groped his massive balls, feeling the heat of them through the thin fabric before her fingers gripped the base of his semi-erect shaft.

She felt her equine pussy wink involuntarily, a droplet of her fluid dripping down to the concrete next to the pool. She'd been wet for the past half hour, ever since that football player groped her. She was so horny that she was on the verge of saying yes to his imposition, leading him to the empty bedroom and lifting her tail for him before Brad got the chance. But then she saw Brad...

Brad! She could feel Brad's cock!

"Why don't you show me what you can do with this? One of the bedroom's is empty..." she whispered. She didn't want to tease, she was too horny and wet for innuendo or nuance. She wanted to make up for lost time. She had the most popular colt in the school in her arms and she wanted him to fuck her. Now.

Brad didn't say anything. That's so Brad, Jennifer thought. He's playing it cool. But his cock isn't lying.

"Come on," Jennifer said with a laugh as she grabbed Brad's hand, leading him back into the house, the small colt in the SpiderHorse costume being all but dragged along by the giantess in the skimpy witch outfit.

She breezed through the living room with Brad in tow, only the pot-head Friesian looking up from his game of beer pong to give them a glance before she was in the hallway. Second door on the right, she found the empty bedroom and pulled the colt in with her, shutting the door behind them.

She wasted absolutely no time, kneeling down on her knees as soon as the door was closed. Brad's costume had a zipper on the front, starting at the neck and running down the entire length of his torso. She inelegantly grabbed and unzipped it hastily as far as it would go, exposing the base of Brad's cock and his enormous balls. She wrapped her huge hand around the base of the shaft; most of it was still trailing down the SpiderHorse costume pant leg. She clumsily yanked up on Brad's cock until the entire, engorged member was free. The entire shaft rebounded when the head of his cock cleared the red and blue fabric, nearly hitting Jennifer in the face when it sprung upward and slapped loudly against the colt's stomach.

Oh my god, this is the biggest cock I've ever seen, Jennifer thought as she looked down at the tip. On her knees she was about at eye-level with the much shorter, smaller colt, though bent down looking at his cock she couldn't see Brad's face due to the wide-brimmed witch hat she was wearing. He was still wearing that mask anyway, so it wouldn't have mattered.

There was just a second of hesitation. There was something off - Brad's coat was gray, but she thought it was a lighter shade than the bare stomach and chest in front of her. She knew it was lighter than hers at any rate, but the color of his torso was almost exactly the same shade of gray as her coat. Maybe his arms were lighter than his body? But if he was a thoroughbred that wouldn't make sense. Then there was the coloration of his cock; as a thoroughbred she'd expected it to be solid black, but it was mottled with pink splotches. That was hot, for sure, but it wasn't what she was expecting for a thoroughbred Arabian.

But the hesitation was only passing. This was _Brad_after all, and she wasn't going to miss this chance. Maybe there was a different breed in his bloodline somewhere? It didn't matter. He was still the most popular colt in school. His dad was still rich. She bent down and took the tip of Brad's cock into her mouth.

She heard him exhale heavily through the mask he was wearing as she began bobbing her head. She tasted his pre as his huge dick slid in and out of her mouth, her lips wrapped around its girth as her tongue danced across the base and over the dimpled ridges. She'd expected Brad to be a little more dominant with her, but he seemed content to just let her do what she wanted with him. And in less than a minute, she'd had enough of just sucking on his cock. She wanted to feel it inside her.

The tip of his cock slid out of Jennifer's mouth and she stood, towering over the masked colt. She spun around as quickly as she stood, affording him no chance to see her face through the mesh material over his eyes. He wouldn't have noticed even if she had; she hiked up her black skirt as she took a step for the bed, exposing her bare, pear-shaped equine pussy to him. It dripped with her own fluids and winked several times as she lifted one leg, then the other onto the bed. She spread her legs, raising and presenting her ass with her knees on the bed.

"Fuck me," was all she said as she lifted her tail.

Jennifer smiled as she heard the clop of Brad's hooves behind her, coming towards her without a second of delay. The distance to the bed that had taken her two steps took him four, but as she crooked her neck and looked between her ample breasts and down her body, she saw Brad was already on his knees behind her, ready to mount her from behind. She felt his hands grab her ass firmly and saw his bare cock between her thighs.

There was another second of hesitation just then - his _bare_cock was between her thighs. She may have fucked a dozen guys in the past month, but she'd made every one of them wore a condom. She wasn't about to become one of those floozies that gets knocked up during their senior year!

"Wait... do you have protection?" she asked, staring down the barrel of his enormous shaft.

"I don't, no," she heard Brad's muffled, distorted voice reply, his face still covered by the SpiderHorse mask.

Shit, she thought. Shit. Should I let him fuck me without a condom? I've never let a guy do that before. But then again, this is _Brad,_and I'm horny as fuck. Do I really want to blow this opportunity? If I stopped him now, what would that do for my popularity? He'd never want anything to do with me again. And I'm sure he knows what he's doing, with all his experience. I'm sure he's fucked plenty of girls bareback. He won't cum inside me.

Still... what if he does? If all the stuff they talked about in Health class about monthly cycles is right, this is not a safe time for me. It's_definitely_not a safe time. It's actually the most _dangerous_time for me. What if he cums in me? What if I get pregnant?

What if Brad knocks me up?_It was wrong, but the thought was titillating in a profane way. He'd be forced to take responsibility. He might have to _marry_me._Brad and me, together! Of course she didn't _want_that, but if it happened...

"It's okay," Jennifer said as she looked at the mottled black 14-inch horsecock hanging down to the bed, dripping precum. "Just pull out."

Brad didn't respond. Jennifer felt his relatively small hands on her broad ass and saw his cock flex upwards. Brad was way too short to fuck her if they were both on their knees, and Jennifer watched between her legs as he scrambled to his hooves, the red and blue of his costume still covering both legs as he stood behind her in a crouched position, the only way to get her pussy and his cock in alignment.

She'd expected a lot more control and expertise from someone as experienced with women as Brad, but instead she felt his enormous cock bounding and bouncing off her ass. In rapid, shallow thrusts it poked her thigh and glanced across her black donut-like tailhole, smearing them with precum. It slid past her pussy and along her thigh, the dripping tip humping the air frantically, almost desperately. It was like Brad was a virgin, or even a feral horse, overcome by the insatiable and absolute desire for his cock to find a wet, tight hole, but without the experience or knowledge to find it, relying only on primal instinct and frantic prodding until he felt the slick heat around his manhood.

Definitely not what I expected from Brad, she thought. But it was pretty hot in a way, too. He must just be so overwhelmed he can't even think straight - he's not used to a mare like me! I'll show him what he's been missing out on. I'll help him find it...

With her ass in the air and her face down on the bed, she reached back under her body and between her legs. She grabbed the

dripping tip of the wildly prodding, unprotected horsecock and guided it towards her puffy equine pussy lips.

"Oh, Brad..." Jennifer moaned as she felt the first few inches of her little brother's cock sink into her.

• -

What the fuck is happening?!

The phrase kept racing through Matt's mind. One moment he had been standing next to the pool watching the naked babes - the next thing he knew he was being groped by giant hands and all but dragged into the house by a huge, strong mare. He could barely hear what she was saying with his ears pinned to his head by the mask, and he could barely see where he was going through the mesh over his eyes. He thought he caught a glimpse of the Friesian who'd wanted to play beer pong giving him a thumbs up, but he wasn't sure.

Without a word the giantess pulled him into the bedroom and shut the door behind them. Without giving him any chance to say no she unzipped his SpiderHorse costume and almost violently yanked his erect 14-inch cock from within. And without a second of pause, she wrapped her lips around it.

Matt's mind went blank, the warmth wetness around his cock unlike anything he'd ever felt. He looked down to see the face of this goddess slurping on his dick, but she was totally obscured by the wide brim of the costume witch hat she was wearing. He thought about taking off his mask to get a better look, but just as he was about to she stopped sucking him and stood up. Matt watched awestruck, his cock aching for the feeling that had just abandoned it, as she sauntered to the bed, knelt on her knees and lifted her black skirt.

"Fuck me," he heard her say.

Alarm bells should have been ringing in his head as he took in the sight - albeit still obscured by his mask - of the gigantic mare presenting herself to him. Even though his mask muffled his hearing, he should have been able to recognize the voice. The mask obscured his vision, but he should have been able to recognize the light gray fur mottled with white, the black tone of her slick, winking equine pussy and protruding tailhole. He should have been able to tell that this was the same rump, pussy and tailhole that he'd peeked under the bathroom door to see. That the mare presenting herself to him was his sister.

But his mind was blank. All he saw was a gorgeous mare begging for his cock.

He moved forward as if his legs and hooves were possessed, all conscious thought vacated from his mind, shoved aside only by the singular desire to breed this mare. He got on his knees behind her and shuffled forward until his cock dangled between her legs, the tip extending all the way down to the bed. He found his hands on her impossibly wide ass.

One of the alarm bells almost broke through the barrier of his lust and into his conscious mind. The view he was seeing was similar to the one he'd seen just a few hours ago when his sister sat on his chest and ruined his game of GoldenRye. No, not just similar - it was_exactly_the same. The pussy, the tailhole, the coloration of her fur, her_size_; what other mare did he know who was as big as his sister, let alone high school fillies? No one. Literally no one. Yet the filly presenting her enormous ass to him had to be just as big.

"Wait... do you have protection?" he heard the oddly familiar voice say. But his mind was too far gone for him to place the voice, or even register what she'd said.

"I don't... know..." he mouthed, eyes still down on the enormous mass of ass baring itself to him.

"It's okay..." he heard her say.

She said something after that too, but Matt didn't hear it. At that moment he saw her perfect black equine pussy wink hard, dripping with her feminine juices and exposing the warm pink flesh within, as if pleading for him to ram his cock deep inside.

Matt lost the last shred of self-control and lucid faculty he had remaining. His long black and pink-speckled horse cock flexed upwards, and when it failed to find the horse pussy it demanded to fill it compelled Matt's body to find it.

Matt lifted himself off his knees and his bare hooves planted down on the clean bedsheets. His hands gripped the mare's ass tightly as he began thrusting. The motion was totally out of his control, wild and frenzied humping commanded by the deepest animalistic part of his brain. His gaze remained focused on the mare's sex as the tip of his cock prodded desperately all around it, on her ass and across her tailhole. It slid across the lip of her pussy and past it - Matt's hips surged forward on their own, but his cock failed to find the hole it was so recklessly searching for.

He felt something tighten around the head of his cock, and in his lust-filled daze he thrust into it. But the strong fingers that had wrapped around his shaft held firm, instead guiding the glans of his equine penis to the prize it so roughly sought.

It was a feeling unlike anything he'd ever experienced, the impossible warmth and tightness and slickness that suddenly enveloping his sensitive member.

"Oh, Brad..." he heard the mare moan as he sank his cock into her. Into his own sister.

• -

Jennifer felt her brother's shaft - the shaft she thought was Brad's - deep inside her. Her tongue lolled out of her mouth as the gigantic horse cock filled her equally gigantic equine pussy. Her tail lifted higher and curled forward to give him unfettered access. Without warning he started thrusting into her in earnest.

She was worried at his erratic motions at first, but just seconds after he was inside her 'Brad' was fucking her like she'd never been fucked before, his pace almost unfathomable. It was strange; he was the smallest guy she'd fucked, but he also had the biggest cock, and it wasn't even close. Who knew an Arabian thoroughbred could have such a monster in his pants, she thought.

But it wasn't an Arabian thoroughbred. It was an adolescent draft Shire, just like herself. He had a lot more growing left to do, but his dick already matched his breed.

Breed. That was the only urge in Matt as he watched his blotchy black and pink cock pump rapidly in and out of his sister's slick, dripping cunt.

"Nnnnnhhh!!" Jennifer wailed into the pillow on the stranger's bed, not wanting the party-goers outside to hear as the colt less than half her size fucked her harder and deeper than she'd ever been fucked.

Maybe it was the knowledge that this was Brad, that the most popular boy in the school was giving her the pounding of her life. Or maybe it was that he was fucking her raw - doing it bareback added a whole new level of risk that she didn't even know she found erotic until now, and the feeling of bare flesh inside her instead of the latex of a condom was so good that she didn't think she could ever go back. Either way, in less than a minute of being railed by 'Brad' she was rapidly approaching orgasm.

So was Matt. Once his sister's fingers had guided his bouncing, prodding horse dick to her fertile slit he immediately rammed it deep into her, no hesitation and no thought for her well-being. He'd pushed until he couldn't any more, a week's worth of pent up lust and a lifetime of newly shattered virginity driving his hips forward. He'd been pumping into her from behind with fierce, reckless abandon for less than a minute, but he knew he couldn't hold out much longer. He was too inexperienced, his dick too sensitive. He was seconds away from cumming.

The bedroom door behind Matt and his sister opened suddenly. One of the colts from the party outside was leading a filly in, hoping to find an empty bedroom to do exactly what Jennifer and her brother were doing.

He had one hoof in the room before he saw the unwitting incest happening on the bed.

"Oh shit! Sorry!" he yelped.

Jennifer began scrambling up to her hooves. As she did, she lifted her brother off his own hooves and into the air. For a few thrusts Matt found himself clinging to Jennifer's back, ignoring everything except the need to release inside the giant he was fucking, like some tiny parasite latched on to its host. But as she lifted herself up he lost his grip - his 14-inch horse cock slid out of his sister's pussy with a loud, wet plop.

At the same instant, the colt who'd interrupted their inadvertent incestuous tryst ducked out of the room. He flipped the light switch next to the doorway out of habit before shutting the door behind him.

Jennifer found herself standing on the bed in total darkness, her pointed equine ears brushing against the ceiling.

The room was in absolute pitch black darkness now that the lights had been turned off. Jennifer crouched back down on her knees, careful not to put her immense weight down on the smaller colt she could no longer see.

"SpiderHorse caught him a bigass fly!" she heard from the hallway outside the bedroom, followed by laughter.

Fuck them. Fuck them all, she thought. They're jealous that they're not as popular as me. They're jealous that I was fucking Brad.

But then again, Brad was still wearing that ridiculous SpiderHorse costume. If that jerk had seen it was _Brad_fucking her he wouldn't be laughing.

"Take off that costume," she whispered. "I'll take off mine."

Matt pulled off his mask and his long equine ears flopped out. The mesh that covered his eyes was no longer obscuring his vision, but in the absolute darkness it didn't matter. He couldn't see a thing.

He felt the bed move and shake as Jennifer pulled down and removed her skirt, hat, and started unclasping the costume corset she was wearing. As she undressed, he pulled his arms, then legs out of the skin-tight SpiderHorse costume and tossed it on the floor. He was totally naked now as he leaned back onto the bed on his elbows, his legs spread and his mammoth cock laying on his belly and chest.

In the brief respite he realize there was something familiar about that voice when she'd told him to take off his costume. Where had he heard it before? He was just about to place it...

Jennifer crawled on the bed to her brother, the colt she thought was Brad. She felt his bare thigh in the dark with one hand, then the other, before lowering her equine head between Matt's knees. She pressed her nose against his huge, lemon-sized balls and exhaled sharply. Matt felt the hot exhalation from his sister's large flaring nostrils as she licked his cock slowly from base to tip.

She dropped her hands on the bed on either side of Matt's head and slid forward, her back arched like a great whale breaching the surface of the ocean. At the same time she lifted her knees over Matt's legs, straddling him. Matt felt her lowering her colossal body on top of his and he was powerless to stop it, 350 pounds of mare muscle pressing his 140 pound frame into the bed.

Neither of them realized it, but it was the second time that day Jennifer had sat on her brother's chest. Last time she'd been facing away from him instead of towards him. Last time she had his P64 controller in her hand to ruin his game, but now she was reaching down between her legs and wrapping her fingers around her brother's cock.

Matt stopped trying to mentally recall where he'd heard that voice, a minor concern that was forgotten instantly when he felt the mare's strong hand once again guiding his cock into her. His hands moved on their own up to her thighs, each one as thick as his entire torso, then further up. He felt the sexy curves of her unbelievably wide, child-bearing hips.

Jennifer bit her lip as she felt 'Brad's' relatively small hands groping her. She'd known that once Brad got a taste of her he'd fall for her right away, that he wouldn't be able to get enough of her strong amazon goddess body. His wandering hands told her she was right. His cock told the same story.

She lifted the tip of her brother's black shaft to her wet, winking, waiting sex. In a smooth motion she coaxed it between her thick equine pussy lips and inside her, sliding her body back into it until it filled her.

Matt's groping hands had worked their way to his sister's broad but toned stomach by that time. He gasped as their incestuous intercourse began again, and his thumb hooked needingly into his sister's navel - the scar from when she was born to the same mother as Matt.

Jennifer edged back into her brother until she was hilted, all 14 inches of his shaft snugly inside her and his immense black balls pressed against her puckered black tailhole. As she did, her large, pert breasts straddled Matt's face; the siblings' immense size difference meant that even when their hips were in line, Matt's head was at the same level as his sister's chest.

She smiled deviously when she felt 'Brad's' hands trail up to her breasts, squeezing and groping them without restraint. She began rolling her hips, riding his absurdly huge cock.

Matt tilted his head and opened his mouth. He explored his sister's bare breast with his lips and tongue as she rode him, searching in the dark for her broad black nipple. When he found it his dexterous equine lips latched on.

"Suck it... suck my titty... yes..." Jennifer whispered into her brother's pointed equine ear, her strong arm cradling his head from below as she bucked harder on his dick. Her equine nostrils flared again, blasting a strong gust of hot breath on the side of her brother's face.

Matt's hands instinctively went back down to his sister's hips, his arms stretched wide to grab both sides. He wanted to wrap his hands around to her ass, but his arms weren't long enough and her hips were just too thick. Each one of her ass cheeks was wider than his whole body. Instead he grabbed on tight to her, thrusting up in time with her quickening rocking pace.

In a few seconds she was bouncing quickly on his cock, his leathery black ballsack slapping audibly on her ass with each hilting thrust. It punctuated the wet squelching noise of Jennifer's sex as her brother's cock plunged in and out. Matt was again approaching his climax - there was no way he could hold out much longer.

His sister was too, but there was something wrong. This wasn't how she imagined sex with Brad would be at all. Sure, she was several feet taller than Brad and two-and-a-half times his weight, but despite her hulking size she much preferred being submissive during sex. Of course they both knew she could bench press him and throw him across the room if she wanted, but Jennifer loved giving up control during sex and just letting a stallion ravage her. Maybe it was _because_she had always been so big and so strong that she preferred being the passive, submissive partner in bed; it was a chance for her to feel more feminine, even if she had to pretend.

At the high point of her bounce she lifted her hips higher. Matt's cock slipped out of his sister's pussy, rebounding against his chest with a loud s __lap_ ,_a stream of his own precum and his sister's natural lubrication following it. In the absolute darkness he could see nothing, but he could hear and feel the giant mare leaning backwards onto her back. At the same time, he felt her huge hands trail down his arms. She didn'tgrab his hands or pull him on top of her; she gently tugged on his arms, as if to simply _urge_him to take the initiative, _encourage_him to lean forward and wedge himself between her legs.

Jennifer wasn't even laying flat on her back before her brother started lifting himself up. He'd been so close to cumming twice now only for his orgasm to be stolen from him. He wouldn't let it happen again.

In the pitch darkness of the stranger's bedroom he couldn't see the equine pussy he was chasing, relying instead on his other senses. He heard the giant mare laying on her back, he felt the bed heaving under her weight. But more than anything, and unbeknownst to him, he was following her scent.

It was the same scent his sensitive equine nose detected, barely perceptible, when his sister sat on his chest earlier that day. Her heat. It pervaded the room now, doing its part to help cloud Matt's reasoning and rid all thoughts except the desire to breed. It cleared all the hints and clues and screaming signals from his conscious mind that this wasn't just any mare he was fucking - this was his own sister.

Matt crawled toward his sister on his knees, his glistening horse cock extending all the way down to the bed and dragging on the sheets, leaving a slimy line of sexual juices on the sheets. His hands found her thick, meaty legs and trailed up them as his nose went straight for the source of the intoxicating scent. When his face was just inches away from his sister's fertile pussy, his head between her strong thighs, his upper lip curled up and he inhaled sharply. It was an involuntary action, the Flehmen response, common to all male horses when they encountered that scent. It told Matt's animal brain that the mare was ready to be bred.

Jennifer heard 'Brad' exhale and felt his breath on her dripping sex.

"Hahhh..." she moaned, feeling her brother's mouth press against her pussy lips and his tongue plunge deep inside. She reached down and grabbed his equine ears. His tongue probed deeper into her folds and she moaned again, closing her legs until Matt's head was wedged between her thighs.

Matt could hear the mare moaning as his long tongue twisted and curled inside her. With his head squeezed between her thighs, his nose full of her musk and his face buried in her pussy, his entire world was his sister's raw sexuality. But as heady and exciting this experience was, it wasn't what his body was screaming at him to do. He felt his erection throb, pleading with him to shove it back into the warm, tight crevice his tongue was flitting in.

Jennifer felt her brother's lips slipping from her mound, his tongue sliding out of her and licking up her body toward her navel. She began slowly spreading her legs again as Matt's hands moved forward, groping up her torso.

Matt shuffled his knees forward. At the same time he stopped licking his sister and lifted his head up.

Closer in he shuffled. His left hand found his sister's waiting pussy, his right went to his rock-hard cock. It had only been minutes since he'd lost his virginity, but he'd already learned that it was impossible for the tip of his unwieldy 14-inch horse cock to find purchase without a hand to guide it in. The previous two times it had been Jennifer's, but this time he used his own.

He felt his sister's equine pussy winking uncontrollably in his left hand, desperate to be filled by the enormous rod of horseflesh he held in his right. Slowly, carefully, he guided the head of his horse dick towards the quivering mound of femininity. He spread his sister's lips slightly, he eased forward. The first inches of Matt's cock entered his sister's pussy.

Jennifer heard 'Brad' make a cute noise, like a mix of a satisfied sigh and a pleasured whine as he slowly sank his shaft into her. It was a distinct change of pace from his previous wild humping; slow, deliberate, almost sensual. There was a familiarity to him that she couldn't explain.

She bit her lip again as Brad pushed his hips forward, feeling each one of his 14 inches slowly fill her. She felt his medial ring clear her threshold before sliding into her, then finally she felt the warmth of his body pressed against hers and the weight of his full ballsack as he bottomed out, filling her to the hilt.

"Nnnnh..." Jennifer cooed, laying on her back as the small young colt started rocking his hips. He barely withdrew his penis at all with his beginning thrusts, keeping nearly his entire length deeper inside her that any other colt she'd fucked had reached. It was a feeling Jennifer savored; she still couldn't believe how much better unprotected sex felt, the indescribable heat and texture of raw horse cock filling her.

"Yeah... just like that..." she whispered as she reached her long arms out in the dark to the young colt between her legs. He began thrusting faster and deeper as Jennifer gave his ass a firm squeeze, each of her brother's ass cheeks being fully covered by her huge hands.

"Mmm-yeah, fuck me..." Jennifer exhaled, gripping her brother's ass and coaxing him to fuck her harder, pulling him into her sopping sex. His pace quickened as she slid her strong hands up his back. He has such a slight frame - delicate, almost feminine, she thought, as she felt up her own brother's torso. His was nothing like the large, masculine, muscular frames of the studs she'd fucked who were on the football team.

She felt his ribcage under his skin and wrapped her powerful hands around his thin, undulating body. There was something perversely erotic to her about spreading her legs and giving herself to this colt that was barely a third her size - it wasn't just because she thought it was Brad, it was something else. It was the total submission required to let such a small, physically weak colt fuck her that turned her on. She could forget how big and strong she was, forget all the taunts of 'Jumbo' and 'Jenn-heifer' she'd heard her whole life.

There was something else too. Again, that intense familiarity... it was like she already knew his body and had known it for a long time. She couldn't explain it other than it must be a connection of some kind she'd never felt with another colt. What was Brad doing to her?

Then there was his cock. It was absurdly large, almost lewdly disproportionate to his body. He was the smallest colt she'd ever fucked, she had no doubt as her hand trailed up to his shoulder and arms; her fingers were able to wrap all the way around his upper arm and all but non-existent biceps. But his cock was by far the largest among that lineup of young studs, she was just as sure, as his thrusts became deeper and faster, his engorged balls beginning to slap audibly on her posterior as the sounds of wet sex filled the pitch dark room. God, his shaft is as thick as his arm, she realized. If that isn't hot I don't know what is.

"Yeah... give me that fat fucking cock... fuck my pussy... fuck me good..."

Matt heard a constant torrent of whispered filthiness coming from the goddess of a mare beneath him. He felt her huge hands groping his soft body, not forcefully pushing or strongly pulling but just_feeling_him up and down.

This was everything he'd ever dreamed of. Just minutes ago he'd been on the verge of heading home after a disappointing night. Now he was balls deep in the most gorgeous mare he'd ever seen, his virginity gone forever.

"Get it... get that pussy... fuck me... fuck me... fuck me hard..."

He hadn't _seen_her though, not really. When she was leading him from the pool and when she was sucking his dick her face had been obscured by his mask and her costume witch hat.

The best view he'd gotten of her was when he was riding her from behind, just before they'd been interrupted and the lights had been turned off. That view had been brief, but it seemed identical to the one he'd seen while peeking under the bathroom door at his sister. And now, fucking her more and more roughly, he began to imagine it_was_his sister.

His sister had the ideal body for him; maybe most stallions and colts didn't like bigger mares, but Matt sure as hell did. Matt almost hated his sister on a personal level, and she hated him, but she had the sexiest shape and size of any mare he'd ever met until now.

Until now. This mare had to be as big as his sister. Same size, same shape - she even had the same coloration. He hadn't seen her face and didn't even know her name, but everything he had seen was almost perfect. Everything he _felt_was too. A dream come true. In the absolute darkness of the bedroom it was easy to pretend it _was_his sister. The memory of her nude body seen from under the bathroom door flew through his mind.

Matt leaned his body down onto his sister without slowing the pace of his rocking hips. His chest barely made it above the giantess's navel, but his head aligned perfectly with Jennifer's huge breasts, heaving and bouncing in time with his thrusts.

"Fuck me, fuck me, fuck me!"

He felt her big hands on his back and his ass. At the same time he jammed his head between her tits, wrapping his skinny arms around them and pulling them to his face. Buried in a huge mare's tits with his cock buried deep inside her, fucking her senseless while she clung to him, almost holding him captive with her strong arms and legs, begging for him to fill her - if this wasn't heaven, Matt didn't know what was.

Jennifer's hands slid up her brother's back to his head, wedged between her tits. Matt became aware that her hands were on the side of his face, then on his snout, gently goading him to look up. His long equine face tilted obediently and Jennifer crooned her neck.

Matt's eyes widened as he unexpectedly felt his sister's lips on his and her tongue slide into his mouth, though in the pitch darkness he could see nothing. He closed his eyes as the initial shock of it wore off and he melted into the experience; he was actively fucking a mare, but this was his first kiss. How odd it was, the thought filtered through, that he lost his virginity before he had his first kiss?

Their tongues twisted and curled, their lips sliding against one another. It wasn't a new experience just for Matt, either - Jennifer had never felt this level of connection with anyone else she'd fucked before. She'd never felt such familiarity with anyone up to now, like they'd always known each other. Like they were meant for each other.

Matt was pumping his cock in smooth, steady motions as their tongues danced. He'd already learned so much in such a short amount of time, trading the wild, animalistic humping of his first mount for the sensuous rolling motion of his hips. Still, this was his first time, and he had a week's worth of pent up frustration from watching his sister under the bathroom door, edging himself close to orgasm but never cumming. His enormous balls were heavy with seed begging for release. With his cock plunging more that a foot deep inside a mare's sex, winking and eager to milk him, he was close. He could feel his orgasm building.

Jennifer could too. As she frantically made out with her brother, her hand shot from his head down to her loins. She could feel his huge shaft plunging in and out of her, sliding between the smooth folds of her sex. Her finger went to her clit, slick with their shared juices, which she began to rub vigorously. This was always how she brought herself over the edge to orgasm, just like she had earlier that day when talking to Brad on the phone.

Brad! He's all mine! He loves me!

Jennifer abruptly broke her sensuous kiss with 'Brad' as her climax was imminent. Their mixed saliva dripped from his mouth into hers as she pulled away, arching her back as she violently rubbed her clit.

"Fuck, fuck, fuck, fuck," she whinnied, the gigantic horse cock of her partner now pumping her like a jackhammer. She was on the crest of her orgasm. As her free hand slapped down on her brother's bare ass, all but spanking him, she went over the edge.

"Braaaaaad!!" she screamed into the darkness, tightly gripping her brother's ass cheek and pulling him into her. Her legs trembled and her hooved feet curled as waves of pleasure coursed through her body.

At the same instant, Matt was a hair-trigger away from his own explosive orgasm. When they were kissing he'd felt the tingling at the tip of his penis that told him he was on the verge of cumming. When she broke the kiss and grabbed his ass, pulling him as deep as he could go, he felt his knees shaking on the bed and his hips wobbling, the last erratic thrusts before his imminent climax. And when Jennifer moaned out in ecstasy, calling a name Matt didn't recognize, the slick muscular walls of her equine pussy contracted around his shaft.

Matt didn't call out a name or scream or moan. Whether it was his experience trying to stay silent while jacking off as he spied on his sister or just his personality, he couldn't say. But as his sister screamed Brad's name, Matt barely made a noise. He slammed his hips forward, clenched his eyes and gritted his teeth, hilted his sister and ejaculated.

Jennifer was still gripping Matt's butt tightly and screaming Brad's name as her brother's equine cockhead flared deep inside her, widening and expanding like a sprouting mushroom. The first powerful jet of cum erupted from the now-engorged tip, a broad stream of thick white seed pouring into his sister's unprotected pussy.

"Braaaaaad!!"

Matt's massive balls twitched and his black donut-like tailhole spasmed, his thick equine cock pulsing again. Another surge of her little brother's incestuous cum poured into Jennifer like water from a fire hose. Matt's flared cock expanded tightly against the inner walls of her sex, an evolutionary adaptation of equine anatomy that prevented any of the cum being pumped into Jennifer from escaping.

"Fuck, Braaaaaad!!"

Matt's arms were still wrapped around Jennifer's breasts. He pulled them together again and buried his face between them. Pulse after voluminous pulse, Matt dumped a week's worth of pent-up cum into his sister's winking pussy. While she quivered and screamed he remained silent and still, his body tense as he rode out his orgasm.

There was no rational thought in his mind, no thought for the consequences of this night. There was only the urge of his body. Leave your cock buried as deeply as you can inside her, it said. Don't move, just cum. Pour it into her. Fill her up. Fill her with your foals, the urge commanded. And Matt made no effort to resist.

After nearly a dozen pulses Matt was spent, the last weak spurt coming as he felt his orgasm subsiding. It was the most intense orgasm he' d ever had, and after a week of edging it was the most he'd ever cum - he'd pumped more than half a liter of his potent semen into his big sister. With his flared cock sealing it inside her and with nowhere else for it to go, most of it was now flooding Jennifer's fertile womb.

Jennifer had felt 'Brad's' cock flaring inside her when she was riding her own crashing orgasm and screaming his name. It was a feeling she was used to from all the other colts she'd fucked in the past month, but all the other colts had been wearing condoms. In that moment she'd forgotten that Brad was fucking her bareback.

As she came down from her orgasm, she felt something that she'd never felt before: a warmth deep inside her that seemed to be spreading, concentrated at the flared cockhead. At the same time she felt the flare just beginning to shrink, the hard horse cock inside her begin to soften. She realized it, then. He came inside her.

"You... came inside me?" she asked, knowing the answer.

'Brad' didn't respond. He began lifting himself up off her as his penis softened more, starting to retract out of her. A rivulet of cum found a gap between the siblings' flesh and squirted out of Jennifer's flooded pussy at high pressure, Matt's softening cock no longer sealing it inside her.

"You fucking came inside me? Are you fucking serious? I told you to pull out! What the fuck?!"

Matt froze, the only motion his still-softening cock slowly retracting from his sister's cum-filled pussy. He recognized that voice. He hadn't before, when it was soft and sexy and sensual and horny, but now it was angry. And he recognized that angry voice.

It was his sister, he was sure of it. He'd fucked his own sister.

The door to the hallway swung open. A colt and a filly stumbled into the room, drunk from the party and looking for a place to hook up. One of them flipped the light switch.

"Oh snap! My bad!" the colt yelled as he saw that the bedroom was occupied. He quickly pulled the filly out with him and slammed the door behind him.

But the lights stayed on.

Matt's eyes adjusted, the previously pitch-black room now bathed in light. He blinked several times.

He saw his sister's face.

"J-Jennifer?" he squeaked, terrified.

Jennifer's opened her eyes, which she's instinctively shut when the lights turned on; laying on her back the light on the ceiling was right above her. She looked between her boobs and down her body, down to the black and splotchy pink equine cock that was almost limp now and sliding out of her. With a wet _schlorp_it slid out of her like a slimy eel, followed instantly by a sound like flowing water as a flood of cum gushed from her pussy, flowing down her crack and coating her puffy black tailhole before being bifurcated by her tail and pooling on the bed.

She looked up Brad's body, up to his face.

But it wasn't Brad's face.

" Matt?!!"

Their world stood still for several seconds as they both looked at each others' horrified faces, the realization of what they'd just done and the implications of it leaving them paralyzed.

Then all hell broke loose.

" What the FUCK?!!" Jennifer screamed.

Jennifer's powerful hands slammed up into her brother's ribcage, knocking the wind out of him like a prize-fighter's punch. Before he even had a chance to wince from the pain he found himself flying across the room, thrown like a ragdoll. He crashed back-first into a dresser several yards away from the bed and fell painfully to the floor onto his shoulder.

" What the fuck!! What the fuck!!" he heard his sister screaming as he tasted blood in his mouth. " You sick fucking pervert!! What the fuck!! "

He opened his eyes and saw her jump up off the bed, spreading her pussy lips as his cum dripped out.

" What the fuck!! Get it out!!"

She plunged her fingers into herself, frantically trying to scoop out the incestuous cum that now filled her.

" Get it out!! Get it out!! Get it out of me!!"

From the floor Matt saw his sister turn her ass to him and run to the other door in the bedroom, the one that led to the bathroom. She slammed it behind her and, seconds later, Matt heard the familiar sound of the shower turning on.

Matt groaned as he pushed himself off the ground, his whole body aching from being thrown across the room by his sister and smashing into the dresser.

He was almost in a daze, in pain and unsure how to process what had just happened. He saw the clothes on the floor, his sister's witch costume and his SpiderHorse costume. A trail of his cum was visible leading from the bed to the bathroom.

Matt picked up his SpiderHorse costume and put it on. He didn't know what else to do. He opened the door to the hallway back out to the party. He could still hear the beat from the music playing in the backyard. The Friesian and his friends were still playing beer pong in the living room. He walked past them without saying a word, out the front door and to his bike, still hidden in the bushes. He pulled it out from the brush and began riding home.

• -

Matt lay in his bed as the clock struck midnight on Halloween night, trying to make sense of what had just happened. Just two hours ago he'd been here playing GoldenRye, he thought. Now he'd lost his virginity to his sister. He'd committed incest.

A few blocks away in a stranger's house, Jennifer was still crouched in the shower trying desperately to wash her brother's cum out of her. But she wouldn't succeed; there was too much, and it was too deep.

Matt stared up at his bedroom ceiling in the darkness. What would he say to Jennifer when he saw her tomorrow? What would happen? Things could never be the same, but what all that would mean he didn't know.

This had been the strangest Halloween of his life, that was for sure. His mind wandered, trying to think of anything other than what he'd just done; were all high school parties like that one? Were all girls in high school as promiscuous as his sister? That would be great if they were, wouldn't it?

Yeah, it would be, he told himself. And he'd find out soon enough. Next August he'd be a freshman in high school. All this will have blown over by then, right? Right. Right.

Matt turned over and closed his eyes, thinking it best that he try to get some sleep. But even as he tried to tell himself everything would be all right, his fate had already been sealed. By next August, on his first day as a freshman in 9thgrade at Chester P. Hooferton High School, Matt would be a father.