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My sister, Molly, had refused to get involved, but when she came to check on the four of us, she saw me, on Andy's back, pounding my huge horse cock into her unprotected cunny and letting 'er rip. For my brown-furred centaur sister, this would seem unbelievable - she'd left the stables when we'd been planning to simply mate (with condoms) a few feral mares, but when she came back, she found two of us getting knocked up at the same time.

Of course, her attention was on me and Andy, but in the awkward pause, we all heard Janine shudder and moan, and then the loudest spurt we'd ever heard as the huge, palomino draft horse on her back dumped his nuts into her fertile, virgin womb, all but ensuring a nice, feral foal or two. Janine squealed, the blue roan bucking her hindquarters up and down around the Clydesdale's enormous tree trunk of a cock, her equine belly filling out even rounder than Andy.

Molly gasped, "Janine, you too!?"

The dazed teenager could only stare over at my sister and shrug, panting and gasping for breath as a veritable river of cum spilled out her cooch. Her stallion grunted and bucked, grinding the five-inch wide cock all the way in, his huge, spasming balls churning up against her rump.

I was pretty out of breath myself after the best orgasm of the night. We'd just discovered that if you could stimulate both our cocks AND our pussies at the same_time, the feeling was _out of this world, and I knew first hand. With a dopey smile, I said, "Things...may have gotten a little out of hand, but you have no idea what it feels_like. You've _got to try it, Molly."

"And end up lust-drunk like you four? No thanks," she nickered. "You seem to have forgotten that you were planning not to knock up the horses, much less each other. Andy, Janine - you're going to get expelled for_sure!_ Do you want to go to public school, and raise a foal?"

Janine moaned, and said, "It was worth it."

Andy said, "We might not get expelled. They can't prove we fucked each other, and the rules don't specifically bar fucking horses."

"You're insane," Molly explained carefully.

Andy shook her head. "No, we're seeing clearly and you're insane. And you won't know it until you try it. Look, Molly, there's one more condom. I was saving it for Millie, but let me fuck you with it. Then you'll see."

"No fucking way," she yelled, exasperated. "There's only an hour left. We have to put these horses away and get cleaned up or we're all fucked."

Janine was groaning, her Clydesdale finally backing off of her to leave her sopping wet and covered in sweat. Still, she managed to glance over at Molly and say, "Except you. Don't you get it? It's worth it. You won't do_anything, sure, but will you at least _watch? I promise it will make a lot more sense."

Molly said, "I've seen more than enough."

Janine walked slowly over, her legs bowed from the huge weight she'd had on her shoulder. "And you liked what you saw," she said, pointing beneath my sister at her bright, pink mottled shaft. There was no doubt that she was turned on, but unlike the rest of her, she refused to act on it.

"No..." Molly whined.

Janine said, "You turned me down once already, Molly. At least do this one thing for me." She took Molly's hand, and pointed her over to the spotted draft horse. The beast was insatiable, but his next target wasn't Alex or Andy or me. He was sniffing at the young, black mare that Alex had pounded. But her black teardrop was spotless thanks to the condom. The stallion knew that no filly should go unimpregnated, and with one quick nip at her hocks, she had spread her hind legs for the massive creature.

"Watch them with me. Please?"

Molly looked from the horses, to Janine, and back. "O-okay," she agreed. "But only to prove that you're wrong."

While the two girl-crushes walked closer to the oncoming horse-and-pony show, Andy looked over at me, holding the condom. "Ready to get it up the cunt?"

I'd wanted it to be Janine, but I understood. Besides, Andy had just let me fuck her bareback, I at_least_ owed her turnabout. We both looked at Alex.

She said, "This I want to watch."

It didn't take long for Alex to secure the condom onto Andy. I couldn't believe it, I was finally going to feel something more substantial than just Alex's entire arm. I'd fucked a horse, and Janine, and Andy, but I was drooling at the thought of getting it from one of them. As Molly watched the Clydesdale mount the black filly, I was spreading my legs and waiting for Andy to make me a woman.

Only, she had other plans in mind. Looking over my shoulder, I watched as the chestnut roan sat down and rolled over onto her back in the dirt, her front hooves tucked up against her chest, and her hind legs dangling in the air. I stared down at her naked body, wondering what exactly she meant to do. She couldn't mount me from down there, and she was too low to the ground for me to fuck her again.

"Come on - ride me," she grinned.

Now I understood. With a smile, I stepped gingerly over the red-furred centaur before lowering my rump as far as I could, sitting on her belly. "Is this going to work?" I asked, feeling her unflared tip bouncing up against my leg. Could she possibly aim that rubber-coated rocket for my cunny?

"I've got this," Alex said, from the side. "Don't you little lovebirds worry about a thing."

Andy groaned as the blonde teenager trotted behind me and grabbed her swollen cock. Alex slid her soft hands up and down the thin layer of plastic - all that would protect me from a baby (or two) in eleven months. Alex patted the cock appraisingly. "You sure you don't want this one raw dog, Millie? After all, Andy did just let you breed her."

I shook my head. "Not ready to be pregnant - by a horse or by a person. Sorry."

"Fine," Alex groaned, directing Andy's cock like a firehose toward my dripping wet hole. In front of me, I watched as my sister Molly stood, dumbstruck, looking at the huge Clydesdale make a dam out of the black filly. Janine was finally getting through to her, running her hands across Molly's flanks and back, and my sister was definitely sporting the rigidest, throbbing cock I'd ever seen.

"Alright, you're going to have to do most of the work, Millie," Alex explained, as she pressed the huge tip against my virgin opening.

It was huge. Compared to Alex's slender arm, Andy's cock was like three arms all at once. Raising my tail, I grunted and pushed downwards, whinnying as that monstrous organ finally pierced my quivering teardrop. "Oh, Andy, that feels so good!"

The chestnut just groaned as I slid down her dick, gazing up at me. Despite being connected in the most intimate way imaginable, we were surprisingly far apart. With me straddling her belly, but mostly standing upright, and her flat on her back, our heads must have been seven feet away from each other. Grinning, Andy slid her hands up to her ample breasts, squeezing and fondling them for me.

I returned the favor, groping myself as I continued to slowly lower myself onto her piston shaft.

"Too bad you're not Molly," Andy said, rudely. But she followed it up with, "But I gotta admit, I'm starting to get a pretty big crush on you, Mills."

"Molly's just shy," I grunted, pushing down past her medial ring. I was so stuffed! "Maybe she needs me to break her in."

Andy smiled. "I'd love to watch you pump your sister full." Was she actually drooling?

I laughed. "With no condoms left, that's not going to happen."

"Doesn't mean I'm not going to imagine it," she replied.

I was getting down to it now, my tight pussy stretched wide, but not hilted just yet. I had to sit back and really press down to manage to get that centaur cock all the way in. But I was a determined teen. Pressing down with almost my full weight, I schlorped down until my tail was flush with Andy's huge balls. "Ffuck!" I gasped, biting my lip.

Andy bucked up against me, but she couldn't generate much force on her back. "Faster, Millie!" she pleaded.

With a grin, I flexed my hind legs and started to raise and lower my rump, slow at first, sliding up and down her wet rubber. If it weren't happening, I'd never have believed I could fit her pink monster, but here it was.

Alex was tired of just watching. She'd been more than accommodating for Andy and me, and now she needed a little something-something of her own. The Paint centaur walked over to Andy and stepped in front of her human torso, her own massive cock dangling toward the athletic broodmare. I put my hands on Alex's rump, watching as her tail raised, revealing her caramel-spotted rump. How I wanted to stain that whole thing white! "Looking for a little cock of your own?" I teased.

Alex laughed. "Good luck getting it in while you're impaled on that one. Besides, I'm not looking for offspring any more than you are. But Andy here owes me." With that, she mirrored my position, only shifted up along Andy's body, her massive cock resting and running along the entire length of the girl's human torso. Andy was face to face with the tip of Alex's cock, and she wrapped her arms around it, hugging it to her.

Andy said, "You just want to give me a face full of cum, don't you."

Alex laughed, but didn't deny it. I was watching from behind, grunting and straining with my own situation, but I still wished I could inch forward just a little and slam my big dick into Alex's nearby hole. I could always pull out when I got close... But she was right, mechanically, that just wasn't possible.

The show was pretty good, though, as I rode Andy like I was at a rodeo. If I leaned to my right, I could just make out how Alex's mottled pink, throbbing cock lay out over Andy's chest like a sausage plate, her organ resting neatly between Andy's large, perky breasts. The tomboy didn't seem to mind, reaching forward with both hands to caress the massive meat, even as Alex began to hump against her. If only my penis weren't lying uselessly across Andy's barrel!

I couldn't lie and say this felt as good as fucking Andy with Alex's hand rubbing my cervix, but it felt damn good to feel so full. And I had full control over the pace and depth. Soon, I was bucking up and down, lifting my rump until just the huge tip of Andy's cock spread me apart, before slamming back down to the hilt, each time neighing in ecstasy. Alex was pounding at those boobs with the same vigor, pre visibly spilling out of her onto Andy's face and neck.

"This is gonna be a huge mess," Andy gasped, biting her lip. I could feel her starting to flare in me, but it wasn't her dick that would cause a mess. That is, unless the condom broke. She was staring straight down the barrel of loaded shotgun and the spread would be magnificent.

Alex grinned, "You'll never get cleaned up before our next class."

Meanwhile, I noticed that Molly was really getting into now, thanks in large part to Janine. She still stood there, mesmerized in silence, each heavy thrust of the draft horse as it prepared to make the black filly a mother flashing through her brain, but Janine was crouched beside and beneath her, one hand on Molly's head, and her mouth suckling eagerly on the tip. Did Molly even realize what her crush was doing, or was she too distracted wishing she were the filly?

Or the stallion?

"Fuck, Andy, I'm gonna cum!" I gasped, and with that, I slammed down so hard I was nearly vertical, my mouth open in a loud squeal. My tail rested against her balls so I felt when she erupted inside me, though instead of stick warmth, I felt the condom ballooning up inside me. I kept my ears sharp for any sound of a burst bubble, but nothing yet. Then I moaned, and moaned, and moaned again, thrashing about eagerly on her raised rod.

"Such a silly O-face," Alex taunted, looking down at the quivering Andy. "Let's add some dressing." Without waiting, Alex rubbed her dick back and forth across Andy's smooth skin, tail hiked and dick flaring. Andy was too distracted and moaning to ever see it coming when a blast of hot, bubbling cum hit her full in the face, turning her moan into garbles. A thick load went straight into her open mouth before the second blast spread wider, splashing her face. Still ejaculating, Alex pulled back, painting Andy's breasts, before pushing even farther forward until her tip rested right at Andy's open, gaping mouth.

The next shot was true, launching straight down Andy's throat. She just gulped and gulped, balls shuddering as she filled her condom near to bursting. I slammed down hard, giving her cum nowhere to go, pressing down on the ballooning end, wishing beyond hope that I could make that rubber burst and get a fresh, fertile batch of centaur baby right in my spasming womb. It wouldn't have been a good idea, but I think I'd have cum again right there, if she had.

The rubber held, though, leaving me well-satisfied but depressingly dry inside.

No one else noticed the thoroughbred. The other stallion wasn't going to just sit around waiting. There were unbred fillies to breed. But me and Alex were a bit busy. I watched as the black stallion walked casually up behind Molly, Janine too busy sucking her off to notice. The stallion ignored Molly's heavy balls, looking instead at her winking vulva. He was sniffing her, and she didn't even know it! I bit my lip, knowing I should warn my sister. But when I tried to speak, I just couldn't.

Even when the stallion snorted and backed up a single pace. Even when he shifted his weight, lifting off his feet. Even when he mounted my shocked sister.

"Hey!" she gasped, looking over her shoulder to see the feral beast clambering onto her. "Get off!"

The stallion wasn't about to take silly orders from silly fillies. Janine let go of Molly's cock, pushing herself away as the brown-furred centaur mare was shoved forward. She struggled to get to her feet, but I was there faster.

I was done with Andy anyway, and I ripped myself off her dick, hooves clattering as I reached my endangered sister. I grabbed the stallion's reins, but I hesitated. Looking fully, honestly at my sister, I said, "Let him do it."

"What!? No!" she gaped at me.

"Come on, you know you want to," I said again, giving his reins slack. We could hear his cock slapping up against his belly as he searched for her wet teardrop. If he found it, there wouldn't be a polite 'are you ready'. He would just claim my sister.

She stared at me. "No - and I'm in heat!"

"Give yourself to him, Molly. He wants you." He was getting closer, his fat tip rising to the right level. Any second now...

"Millie, stop! Someone help!" she whinnied.

I realized that I wasn't going to help her. I was going to hold the reins steady as the big horse pounded my helpless sister, watching in awe as he pumped away, until he filled her like the rest of us, then grunted, and walked away. In my head, she would thank me for it. I knew the stallion would. I'd raise my tail for him and Molly and I could have his foals together, like we were always meant to.

Alex saw things differently. She came up behind me and slapped the reins out of my hand before pulling the horse headfirst off of Molly. He struggled, but the angle was weird, and the stallion hopped off her back just as he was about to hit his target. Molly was saved.

"Millie!" she gaped, turning to me. "How could you?"

"I - I just froze. I swear. I thought you wanted it," I lied.

"After all that you've heard me say today, you thought I wanted it?" She shook her head, incredulous. "That's it - I'm out of here!"

She wasn't kidding, either. Nothing was left of the chubb that Janine had manage to coax out of her. My sister was as limp as a wet biscuit, and I was to blame. I just didn't understand it - how could you take one look, one feel_of that stallion on your back and _not be turned on?

Janine gasped, "Molly, wait -"

"I don't want to hear it," she said, tossing her hair and stomping toward the exit.

Janine sighed. "I just wanted to know if you wanted, y'know, to fuck me? You don't know how long I've wanted to do that with you."

Molly turned to her and said, "I...have a crush on you, too, Janine, but we're just kids. I'm not ready for any of this!"

The blue roan looks crestfallen, trying one last gambit. "I could fuck you...there might be another condom around here."

That's when I saw it - hesitance. Molly hesitated! The problem wasn't that we were all too young. She wasn't interested in fucking a mare because she was a bottom! She knew the stuff she wanted was out of reach because of her heat. How could I not know that - her own sister!

"N-no," she stammered, flustered. "I mean - not now."

Foolishly, Janine took 'no' for an answer. She just nodded and said, "Then if you won't...Alex, you better fuck me right now on that table, or God knows what I'll do!"

The blonde centaur perked her head up, still recovering from blasting Andy all over the face. The chestnut was still wiping cum out of her eyes, licking her fingers clean. "As you wish, my lady," Alex grinned.

But I knew better. As Molly was leaving, I jumped in front of her. "Molly, wait."

"Are you going to apologize?"

"I'm sorry, Molls. I really am," I lied. It wasn't my fault she just wasn't getting it. "But I need you to understand just...how...good it feels. I mean look at how much fun the others are having?"

Molly glanced back to see the dark-blue-furred centaur filly lifting herself onto the stable's observation table. It was a few feet off the ground, and just long enough for a whole centaur. Janine lay back, scooching her rump until just her tail draped over the edge, her hind legs in the air. Molly couldn't help but notice her crush's cum-drenched pussy staring right at her, at least until the Paint centaur blocked her view. First Andy, then Janine had given themselve to that fucking draft horse, and then Andy, and now Janine were about to get it bareback from another teen. There was always a chance that one of my or Alex's swimmers hit their mark.

I already knew I was going to be a parent, inside that tight little Pinto, but what if I made a baby in Andy? That was a lot more commitment than I was ready for. I glanced up at Molly.

"But how can it possibly be worth all this?" she asked.

"That's just how good it is," I explained. Now I knew the angle to take. Molly wanted it up under the tail, but she wanted to be safe. "Let me show you."

Molly said, "That's gross, Mills. And besides, I'm in heat!"

I shook my head. "Not that hole.Higher."

She paled, realizing what I was suggesting. "You've gone out of your mind."

"C'mon. It's safe and you can still get a feel for it. C'mon," I said, grabbing her arm.

She pulled away from me, backing up - toward the Pinto's stall. I said, "I know you want to know what it feels like - to submit to a male? This is your chance, Molly."

She retreated a step more. "I - yes, but..."

"You're just scared, and I get that. But I promise I'll be safe. You'll love every minute of it."

Hesitating, she minced her back feet. "You promise...?" she asked. But she shook her head, as if shaking off the intoxicating lust that filled the stable. "I've...I've gotta go," she gasped, and turned to run.

Straight into the Pinto's stall. It was only wide enough for one horse, and now I had her - trapped. With me standing in the doorway, and her facing a wall, there was no escape. I said, "When have I ever steered you wrong?"

Glancing over her shoulder, she said, "Right fucking now. Millie, let me go!"

Taking a step forward I put a hand on her rump. Her tail reflexively flagged, showing me a perfect, clear view of her rump, her dripping teardrop winking at me. Oh, she_wanted_ it.

"Don't make me kick you," she yelped, realizing the precarious position she was now in.

Gently, I slid a hand down her buttocks then back up in the middle, cupping her wet pussy with my fingers. She clenched down around me, and when I pulled away, I saw Molly whinny, spread her legs, and pee, like she had before, right in front of me. She was in heat, and from the smell of it, she was ready. "You were saying?"

Molly whined, "Stop it, Millie, I mean it. We're making a big mistake!"

"We?" I asked pointedly, lifting a hoof as I readied myself to mount.

"Y-you," she stammered, but she wasn't very convincing. "We...we're like twins!"

Though I came from Cammy, and she came from Stephanie, we were both the same mix of genes, and we were born only a day apart. I just grinned and said, "That just makes it hotter."

She neighed, looking back at me, looking lost. With a grunt, I hopped onto my sister's back, my weight pushing her forward into the wall. "Ready?" I asked, grabbing her right arm as I slapped my huge dick up, searching for her tailhole.

"Millie..." she groaned, but she didn't pull away. Her tail was still splayed.

It took too long, but I got it up all the way, just past her wet teardrop. My tip rested there in the crevassed of her pucker. "Say goodbye to your black cherry," I grinned.

"No," she gasped. "Not there..."

"Then you want it here?" I asked, pulling back just enough for my fat tip to slide down to her heat-swollen pussy.

Her eyes widened, moaning. "Millie...please don't!"

I wouldn't have done it. I swear. If she'd just started with 'don't'. But as soon as I heard her whimper 'please', I slammed it in. How was I supposed to know she wasn't done? Before I knew what I'd done, I'd already plunged my swollen tip right into my sister, spreading her wet, swollen teardrop wide. She tossed her head back and squealed.

This was it - I was in her. My own sister, rawdogging her tight pussy. It felt incredible. So far, I'd only been bare inside Andy, and she'd been completely drenched. That was nice and all, but the slick, warm clenching of my sis's virgin cunt was even better. Every inch I plowed into her was resisted by her pink folds, dragging across my fat cock. I whinnied in triumph!

"Millie!" she moaned.

Was that - was that encouragement I heard in her voice? I hilted myself inside her, my hips flush with hers. "Oh, Molly," I groaned.

"W-we...we can't...!"

I slid my hands up to grasp hers by the biceps, holding her firmly. "Why not?"

She bit her lip, hands pressed against the wall until her knuckles were white. "You'll knock me up!" she managed to pant.

Grunting, I realized she hadn't told me to get off of her. Just not to get off. I shifted my hooves, giving her a second heavy thrust that send her whimpering. "I'll pull out."

"S-soon," she begged.

I grinned. "But not now?"

She looked over her shoulder and gave me a sharp look. "Just hump me already!"

That was it. I'd done it. All her protests, her 'no' and her 'stop', it was all just an act. What she really wanted was a thick, fat horse cock up her cooch. Never mind that I knew I was leaking pre-cum like a sieve. I pumped back and forth, smearing small amounts of sticky seed deeper and deeper until I was sure I'd painted her cervix. Every second was another risk, but Molly just bucked her hips and moaned.

We weren't the only ones starting to make some seriously bad decisions. A glance back at the other three showed Janine on her back, taking it hard from Alex. The blonde's belly pressed down against Janine's cock, rubbing her so hard she was gasping and shuddering, a sticky flow leaking onto her fur. But behind Janine, I watched in awe as Andy stepped up behind Alex.

She wasn't looking to use her arm, either. The chestnut filly climbed slowly onto Alex's back, making the teenager gasp and glance back. "What are you doing?" Alex asked.

Andy said, "You don't think I'm going to let you get out of here without a bun in the oven, do you? If I'm going out, I'm taking you with me."

Alex shuddered. "But you just have a foal..."

Andy said, "Then I guess I've got the upper hand."

Alex shivered, but made no move to get off Janine or to kick Andy away. On the contrary, she spread her legs, knowing full well that Andy meant to make her a mother to a little, baby centaur. No amount of endowment from Alex's mothers would prevent that from getting her expelled.

Andy grunted and thrust into Alex so hard that Janine yelped. "Get ready, broodmare."

I humped into Molly again and again, sweat pouring off our bodies, but still no demand that I pull out. Didn't she realize I was leaking all over her? If the past was any indication, when the time finally came, she'd be begging me to make her a mom. She grinded up and down on my cock, gasping for breath. Sliding my hands forward, I cupped Molly's breasts, squeezing them hard as I pounded her from behind. She just tossed her head back and neighed, clenching down around my fat cock.

"Not...yet," she stuttered, still maintaining that she was going to actually ask me to pull out.

"God, Molly, you're so tight and wet. I just...I can't..."

"Wait, Millie! Are you flaring!?" she gasped.

Twelve thrusts. That's all I could manage before the sheer ecstasy of fucking my sister made me hike my tail and tense my muscles, readying for the end. "Unnngh!" I moaned.

"Get out! Get out!" she yelped, kicking backward with her hooves. So she really meant it! God damn it! I couldn't exactly ignore her. Not now. Squeezing back my tip, I managed to spurt only a little bit of the oncoming flood.

"Please..." I begged.

"No!"

With resignment, I pulled out of my sister, drawing my enormous cock out of her sopping tunnel.

Until - thwump!

In shock, I felt a heavy weight on my back. The thoroughbred that had almost bred Molly! The white star on his forehead was right behind me. He'd grabbed my hips just as firmly, but now no one was around to pull him off! His weight shoved me forward, sinking balls-deep into Molly again.

"Millie!" she complained.

"I'm kinda - stuck!" I explained.

Molly looked over her shoulder to see my predicament and paled. "But - you gotta pull out!"

I squeezed hard on her breasts reflexively as my untried pussy met his first heavy thrust. Alex's arm could do nothing to prepare me for the huge cock pushing through my swollen vulva like a nail through a too-small pilot hole. He pinned me even tighter against my sister, her fertile pussy squeezing my flaring head - her mind might not want it, but her cunt surely did! She was milking me! Worse, I could only toss my head back and moan as he made me a broodmare. All three unbred holes were filled now, Molly's, Alex's, and mine.

"I - ah! I can't!" I wailed.

Molly pushed back, as if she could somehow shove not only me, but the thoroughbred off of her with one push. All it did was turn me on more. "Millie, no! I...can't get pregnant!"

"I'm kinda in the same boat..." I yelped, taking a second and third thrust into my unprotected vagina. He was drilling deeper, and all I managed to do was buck my hips and splay my tail. Our only hope was for one of the other three to pull him off. "Oh fffuck!"

"Oh, shut up!" Molly yelled. "Don't pretend this isn't what you wanted!"

She stared back at me, and I gave her a sheepish grin. "Well...kinda..."

Together, we glanced over at our only chance of savior. No luck - Janine was really pumping up against Alex now, moaning inconsolably, and Alex was even more out of it. With her dick stuffed in blue roan, and her pussy barely managing Andy's fat bulge, the blonde centaur was completely out of it, begging weakly for Andy to make her a mother.

Andy was the only one to notice our predicament, but she just shrugged, and said, "I'm not blowing this chance, guys."

Molly and I shared a glance, realizing that there was nothing we could do. We were both trapped in the stable now, and the black stallion was about to ensure that each of us left here with a parting gift. With a reluctant sigh, Molly said, "Might as well get it over with..."

I gave her my best, shit-eating grin, and redoubled my efforts. How sweet her pussy was - sliding in and out of my sister, her spasming chamber squeezing down and _throbbing_around me. My heavy balls quivered in anticipation, knowing exactly where I was aiming my half-flared head. Again and again I _thumped_up against her defenseless womb, doubly hard with the thoroughbred slamming me forward like the randy stallion he was. I held Molly tight, my hands squeezing gently around her sweaty breasts as I rested my head on her shoulder and whispered, "Feels good, don't it?"

She had to spend a few seconds cutting off her repeated moans, pushing back against me, her tail shoved off to the side. She slid her hands up to meet mine, directing the gentle tugs and presses. "I - I can't believe we're doing this!" she panted, the sharp thwack of my balls punctuating her whines.

"Molly, I love you," I said, and she turned to look at me. Like that, we were kissing, heads tilted, mouths open, our tongues wrestling together, first in her mouth, then in mine, even as I pounded her.

I was in the greatest ecstasy of my life. The first cock I'd taken was good, but as before, when both my dick and pussy were sending electric shocks to my brain, it was all I could do to keep from collapsing on top of her. He drilled me,hard, his bare cock ravishing my heat-swollen pussy. There was only one outcome - I was about to become his broodmare. As crazy as it was to be knocking up my sister, I realized just how _real_this all was; I was going to be waddling away from the stables with a belly full of foal. At least mine wouldn't be Clydesdale-sized, like Andy and Janine. I broke our next kiss to say, "He's getting close..."

"Don't even complain," she warned me. "You deserve a taste of your own medicine." She moaned again, and said, "How many times are you going to be a parent, Mills?"

It was hard to concentrate with all the fucking going on, but I counted for her. "Ahhh! The uh Pinto," I started. "Possibly Andy... you and him."

Molly bit her lip. "If I'd known I was just going to end up - Nnngh! - under you anyway," she started, bucking her hips up and down, "I wouldn't have waited outside!"

"It's freeing, isn't it?" I asked, grunting as I leaned into her. The thoroughbred was really going to town now, shoving me so hard I was pushing Molly into the wall. "Once you know it's too late..."

Molly gasped, digging her hooves into the ground. "You won't - you won't mind if I...ah!...raise my tail for Janine, will you?"

"Go for it, Molls, I know you always wanted her."

"A-and you," she panted.

Wait, what? "You wanted me?"

"I knew we couldn't but...oh God, I've had a crush on you since we were foals!"

I slammed her harder. "And now," I panted, "you'll be having mine." I had no idea she felt that way! I grunted and flagged my tail, biting my lip as I changed our lives forever. Massive tip flaring up against her cervix, I_whinnied_ into the air and claimed my sister's cunt with first one, then two frothing splurts of cum straight into the baby chamber, then an unstoppable flood.

Molly erupted into her first orgasm, jumping around in every direction and tugging and yanking on my huge cock. I was so deep I stayed neatly inside her, dumping my nuts completely into my sister's womb. "Fffuck, fuuuuuuuck me!" she wailed.

I was already feeling pretty good, but then the same thing happened to me. With a satisfied grunt, the stallion on my back rammed forward, warm, bubbling cum battering against my untried walls until with a squelch I heard him breach my walls. I could hear the sloshing as he drained himself into me, what felt like buckets of cum filling my womb until there was simply no room left. At the same time, our dams burst, and seed gushed out of Molly and me onto the straw-floor. Our fevered thrusts kept pressing me harder against my sister, until my balls and his quivered together, thrumming against Molly's rump.

Behind us, we watched as Janine's cock, pinned against Alex's belly, erupted, shooting ropes of cum across Janine's breasts and face. Her moaning mouth took the brunt of it, forcing her to gag and gulp her own seed down, even as Alex took a shot at the blue roan's belly full of swirling draft horse cum. But it was Andy that was surely doing the deed now, hammering Alex bareback and pumping her clean pussy full of little swimmers. "Breeeeeed meeee!" the blonde moaned, despite her earlier care.

Molly and I gasped and panted together, shuddering with the realization of what just happened, but the stallion didn't seem to know or care. With a satisfied snort, the black stallion hopped off of me, letting his fresh seed cascade out of me. I stayed put, rubbing and cradling my beloved sister, and the mother of my seed. "I told you so."

She just smiled and squeezed my hands.

Sure enough, now that we were all_painted beneath the tails, things _really got crazy. While Janine and Molly got together, Alex and I showed Andy just how good it felt to be the meat in a sandwich. Then, since there weren't enough pussy's bred, we opened up the rest of the mares. I got to watch first hand as my meek little sister knocked up a tight little pony, just as the draft horse picked me. I couldn't _believe_how big he was! I could barely move after he pumped me full, and I wondered if the thoroughbred would even manage to claim an egg after that.

We got the rest of the stallions out, which at first seemed like a mistake. Some wanted to fight over us, but there was more than enough horse cunt to go around. You haven't really experienced pleasure until two massive stallions compete over you, and the winner stuffs your cooch. I think I saw Andy fight off a stallion to claim Molly, only to get plugged by that same stallion! Alex, who had been so careful not to get pregnant, ended our time together with the most cocks under her tail. I swear she set a goal to take every last dick in the room, until her Paint rump was completely white.

And that, of course, is how the next class found us. We totally forgot about the time, and the need to clean up, and the hope of keeping this all quiet. It was a lost cause. There was fucking to do! Mrs. Vera was always late to anatomy at the stables, so the first people to catch us were the underclassmen. The look on their faces when they saw what was happening!

But I saw something else in there - envy. With a grin, I said, "Well, what are you waiting for? Come in!"