FSE

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Sebastian stood before the bathroom mirror, hip cocked with a bottle of wine resting against his thigh. It wasn't some oversized thing of Yellow Tail, but a merlot an ex of his used to drink. Still, the rabbit's half-hard cock dropped the length of most the bottle, their girths matching. Sebastian's flat stomach and slim pecs, all covered in downy white fur, took up the rest of his camera. In his other hand he took a bathroom selfie with his phone.

He snapped the pic, then sent it to a girl he'd been sexting: Care for a sip? the message read.

His phone vibrated before he even got the chance to button up his jeans. Hey? Uh, I kinda need a place to stay. You have a basement right?

His younger sister Penny. Definitely a mood killer. She was still in college, staying in an apartment with roommates. Sebastian had already bought a house at twenty-five, having scored a cushy IT job out of college. The place wasn't a McMansion, but definitely a step up from the studio apartments he lived in through his early twenties.

Sebastian adjusted his jeans, which only came up to his tuft of a tail, sagging slightly, exposing the side of his hips and the beginning swell of the bubblebutt all rabbits seemed to have. He set the wine bottle down in the kitchen, still shirtless. He texted Penny back: Drama with your roommates?

Something like that. I just need a place to stay.

Fuck, you have plans tonight? this message from his potential Tinder hookup.

He took a screenshot of his conversation with Penny and texted back: Legit getting cucked by my family rn. Another night?

Well, shit, came the response, then, Listen, you hit me up any time, hun.

Word, word, just keep that pic between us ;-)

No promises~

An angry buzz wiped the smile from Sebastian's face. His sister: Well???

Yeah, yeah you can stay over. For how long? Also you know you don't have to stay in the basement, right? I have a guest bedroom.

He sighed and went into his living room. It was a nice, if still sparsely furnished home. A TV stand, a couple of home consoles with it, and a couch, a half furnished kitchen, an office he invested actual money in, his bedroom, bathroom, guest bedroom, and a basement that he just used to do his laundry. On his couch was the navy-grey-black plaid button-up he wore to work. He started putting it on--sister had seen him shirtless plenty of times but no sense in being awkward. In the kitchen, his phone buzzed on the counter. Before he even got his shirt entirely buttoned, he got a knock on the door.

His ears cocked to it. Penny? He went to it and checked the peephole. Grumbling, he unlocked it and swung it open, saying, "What would you have done if I told you no?"

Penny had been waiting at the porch. Unlike her brother who inherited the rare tall, handsome athletic gene, Penny was like the rest of their family: brown furred rabbit with a short, stocky build. Even with her tall ears up they only went to Sebastian's snout. She was pudgy and liked to wear baggy clothing to hide her otherwise pear-shaped figure.

She cringed at her brother's scorn, looking like a child with their relative height difference, her backpack on over her raincoat, and a small suitcase next to her. "I'm sorry," she said. "I, uh, I just couldn't spare any time and I forgot tonight was--"

"Was what?"

"It doesn't matter," Penny said, pushing her way inside with her luggage. Sebastian shut the door and locked it. She looked around and asked, "Where's the door to the basement again?"

"In the kitchen, around the corner near the backdoor," Sebastian said. "You know you don't need to stay in--"

"Nope," Penny said. "Best I stay down there."

"I..." Sebastian didn't finish the sentence because Penny had already left the room. He was shocked. Not that he did, but he could usually bully his sister into doing something if he needed to, but today she just totally blew him off. He heard the basement door swing open and shut. "Dammit, Penny."

Sebastian went to the door and found it locked. Without a key it only locked from the inside. It was to keep people from breaking into the house through the basement windows. Not that he usually kept the door locked, but--

He threw open the door and said, "Penny! What the hell is going on?"

Lugging her suitcase downstairs slowed her down enough that she hadn't reached the bottom step yet. She turned her head and said, "I'll text you. Just, shit, look I can explain later, just please lock the door, and whatever you hear keep it locked for the rest of the night."

Sebastian stared at her in horror, but Penny's bottom lip and black button nose both quivered. She clearly held back tears, so Sebastian said, "Alright, but text me about this, okay? There should be an air mattress packed up down there, at least unroll that will you?"

She said, "Thanks Seb."

"Fuck, don't thank me for this, weirdo." He shut the door and locked it, stomach in knots about this whole arrangement. He considered going upstairs and getting her some pillows and blankets. Was she going to kill herself?

Shit. No. No. He could not assume the worst. Sure his sister had an anxiety disorder, but she never once self-harmed. There was no way she went here to--

His phone vibrated. He crossed the kitchen and grabbed it. Texts from his sister:

Okay, I'm walking up the porch right now. Thank you. I don't want to go out after dark.

That was from five minutes ago. More recently:

I swear everything will be okay. I'm not crazy or anything. I lost track of time with midterms and forgot what time of the month it was.

Sebastian scowled. What? Are you about to go into heat or something?

Something like that.

Gross.

Just leave me alone for the night, k?

Alright, alright. Can't I at least get you a blanket or something?

I packed one, don't want me stinking up yours, right?

Fair enough. Night, I guess

Night night, Seb

Sebastian rolled his eyes. He now lounged back on his couch, toying with the idea of inviting that other girl back over. Nah, night was busted. Nutting felt weird with Penny around, so he opted to hop up, grab a controller, and game until bedtime.

***

A howl made Sebastian startle awake, groping at the night stand till he found his phone. 2 A.M. He'd been asleep for about 2 hours. He groaned and rolled over in the bed. Below, in the basement, he heard something skitter and scrape over concrete. That could not be right. If not for his sister, he'd pretend he was hearing things, but no chance of that here. He rolled on his back, sheets still tangled about his thighs. Ambient light from a streetlamp cast his room in a reddish black haze. His chest rose and fell. Deep breath. Ear twitching: more skittering and... panting, whining? It could not have been his sister. Had she let in a feral dog somehow?

She better not have been smuggling animals into the house while he slept.

Cursing, Sebastian rolled out of bed. He clicked on his lamp, grabbed his phone and went to the kitchen, being sure to flip on lights all the while. He couldn't help but be a little scared--prey animal instinct and all. He knocked on the basement door and called out, "Penny?"

The skittering stopped.

He wanted to respect her boundaries, so he said, "Text me or say something or I'm coming down."

A heavy pant, followed by a growl. A deep, rumbling voice said, "I'm... fine." Their voice had a struggle in it when they spoke. Whoever it was, it lacked Penny's high pitch whine--deep enough to be a guy's voice.

Their response only put Sebastian on alert. He darted over to the counter and yanked his chef's knife out a drawer. He went back to the door, 911 one touch away from being dialed on the phone he held in his other hand.

"Alright you fuck, if I don't hear from Penny I'm--"

"Go away!"

Brandishing the knife, he worked open the other door with two fingers so he still held his phone, all while the stairs creaked from some heavy weight. He swung the door open, only to find a monster halfway up the stairs. He jumped back into the backdoor, and the mass of shaggy brown fur bulled towards him. Sebastian dropped his phone and thrusted the knife; it sunk into the creature--the wolf's side, below the ribs. Only a few inches before a paw big as his head grabbed his wrist and slammed it against the door. Her--for it was a she-wolf--slammed an elbow into his collarbone.

She was massive. Seb, not counting his ears, was an even six-feet tall and this wolf had nearly two feet on him. Her triangular ears flattened against the ceiling a little as she hunched over him, blocking the narrow vestibule with her bulk. Her eyes were wild and yellow, full of fury. Her jaw hung open, lips curled, teeth exposed. The heavy wash of her breath rolled across Sebastian who, dressed only his PJ's, froze up, pinned and exposed in the predator's grip.

"Seb," she growled. "I... I.. won't hurt Seb."

And it clicked. "Penny?" Sebastian asked.

She answered with a keening whine.

"Fuck... you're... you're a werewolf?" This close, fear receding, Sebastian's whiskers twitched. She smelled completely different. A harsh, feminine musk laced with spice. A sting of heat to her scent that made his heart thump.

"I should..." her new, lupine muzzle struggled to get out the words, "kick your as-as--butt for this."

And he realized he had stabbed his sister. "Shit." The knife, which he had a death grip on till now, clattered to the ground. "Are you okay? Is there anything I can do?"

"I... I need... yes." She let him go and he got a look at her wound. It had already scabbed over, matted blood tangling up her much coarser, much thicker fur.

"Fuck, let's go into kitchen and I can look at that."

"No," Penny said. She grabbed him by his elbow and dragged him like a ragdoll into the living room, flinging him onto the couch. Her bulk surrounded him, paws grabbing at his chest, sliding down his sides. Sebastian tried to push her off, feeling awkward since she was completely nude; he did not want to touch her breasts, but he might as well been trying to shove a landside off him. Everywhere he touched he got palms full of fur ending at soft skin and hard muscle. Her scent, her need was more present and stronger than ever. Stronger than any girl he had been with. She was not lying about the heat thing, at least.

Penny nuzzled into his neck, broad tongue dragging thick saliva through his fur. He shivered when she breathed in his ear, "Need you, Seb."

Gasping, he said, "No--ah!--get off Penny you can't, we're siblings, we're--"

Werewolves were rare but not uncommon. Sebastian knew enough about them to know baser needs often overrode more complex ones like incest taboos, but had his sister always been? Come to think of it, her monthly trips back to their parents made more sense. They lived a four hour drive away, which was why--

All these thoughts swirling in Sebastian's head were terminated when Penny's paw rubbed his crotch. He squirmed underneath her, but she was everywhere. "Heat..." Penny whined. "So bad. Seb, Seb, Seb smells," that paw rubbed faster, and Sebastian felt his whole body growing hot. Her more wild scent combined with her touch, her heat, the feeling of her tongue dragging across his chest, it made it impossible not to get hard. "Seb smells good," Penny finished, nostrils flaring right after.

His head spun. Penny smelled good, too. He found his hands no longer tried to shove her away, but bunched her fur into fists, pulling her closer. Her tongue dragged from the bottom of his Adonis belt up to his navel, making his back arch, fur matted by hot drool of this beast who might kill him anytime. Her paws found the hem of his pajamas and tugged them down, her claws carelessly raking his flesh. He did not mind. Not when she shoved her snout into his thatch of curly white pubes, fur thicker there. His dick, fleshy and pale skinned, dropped to his mid thigh. The smell of his musk hit both of them hard. Penny took a deep breath into his pubes, whining, "So good. So big."

Sebastian grit his teeth as her tongue dragged across his cock. Most girls didn't have the muzzle needed to take his wine-bottle-thick dick, but Penny's tongue, broad and hot and firm, rubbed across the entirety of it. Those smooth taste buds licked up his sweat, dragging back his foreskin to expose the mushroom head and a meatier musk. His hands grabbed her by the scruff of her neck as she kept licking. Her lapping urgent, coated his cock, balls, and thighs in a layer of lupine spit. She had to taste every part of him, eventually lifting his cock up so she could nuzzle into his heavy sack. Her tail wagged as she licked there, tongue reaching, exploring, sampling his musk everywhere. He was a virile male in his prime, and her heightened senses made it impossible to ignore him. Even if he fought her every step of the way, she would take what she wanted--needed from him.

But Sebastian did not fight. He spread his legs, stroking his cock idly while her paws grabbed his cheeks and spread them. He huffed as that big, oral muscle spread explored his taint, then tongued his rim. He shuddered, relaxing as she ate his ass. He certainly did not expect that, but he simply moaned when his entrance yielded. She frenched his asshole, nose rubbing into his taint, tasting and scenting his earthier musk. Sebastian was no stranger to getting ate out, and as that tongue lapped in and out, his walls clenched. He arched his back, dick throbbing in his hand and spurting a shot of precum across his chest.

He felt his nuts draw up. He could not stop touching his cock, could not protest. This scent, her heat, had him flushed and nearly drooling. His longs ears twitched, taking a few deep breaths before he mumbled, "Fuck Penny, I'm gonna... cum... I'm gonna--"

She released him and with a deft paw swung him back up. She sat on her knees on the floor before the couch, already resting her heavy bust on his lap. Her chest fur thicker, softer as she squeezed his cock between her tits. "Mark me," Penny pleaded. Sebastian could not refuse. He let her bust envelope his cock, the last few inches throbbing outside it. Like some practiced whore, she leaned in and took his cock in her muzzle, sucking and stimulating the tip. He grabbed the back of her head and shoved her face down, groaning, shuddering. His head craned to the ceiling, balls drawing tight. She hugged her breasts and rocked up and down, nursing on his dick. She suckled, tongue dragging up and down his tip, the stimulation almost too much as he fought off his nut long as he could.

Sebastian, eyes shut tight, mouth hanging open, came in his sister's mouth with a long groan. This Penny echoed with a moan. She opened her maw so he could watch his dick throb and shoot sticky ropes of seed across her tongue. She quivered, shuddered, her scent growing stronger, and Sebastian realized his sister must have cum as well. She did not swallow, but let his seed drool off her lips, pearly rivulets of sperm dripping from her chin into her breasts. Sebastian huffed, amazed as she just took it. Her maw and lips and chest coated in a messy slurry of his cum until, on the twelfth shot, his orgasm finally began to taper off. He'd cum like he spent the entire weekend edging.

And she... Penny, his sister...

He couldn't not kiss her. He grabbed her by the scruff of her cheek and tugged her into a sideways kiss. The strong, virile taste of his cum filled his mouth in an instant. She moaned, tail wagging as she happily kissed him back. Her tongue filled his mouth, that muscle practically smothering his, but he gladly swallowed the messy mixture of her drool and his cum--totally lost in the debauchery of it all. Sebastian's cock didn't even go flaccid, but remained throbbing against her seed smeared bust while they exchanged tongues. Even the touch of her fangs on his lips excited him. Penny had become an apex predator, but somehow Sebastian still knew she was totally at his mercy.

She proved this when she broke the kiss, telling him, "I need your cock."

Gasping for breath, the now naked rabbit wiped drool from his chin and asked, "Need your big bro's cock."

She whined, ears splayed back.

He grabbed his fat shaft and smacked her tits with it. "This what you need, Penny?"

"Please Seb..."

"Say it."

"Fuck me, Seb. I need it. Fuck your baby sister."

"Heh," Sebastian bit his bottom lip, smirking. "Come on, turn around and hike your tail."

She did, ass pushed up nice and high for him. She was so big he could mount her standing without too much trouble, but what gave him pause was when she exposed her nethers. No longer an anthro's slit, but instead her cunny was a heat swollen spad, the dark brown flesh flushed with heat. A sizable wet spot had gathered on the carpet where she came before, and still she dripped. Her pussy drooled almost as liberal as her maw. He gawked, surprised at the alien and erotic sex.

Sebastian groped her ass, squeezing palmfuls of that flesh and spreading her. It opened her spade ever so slightly, honey-colored filaments of arousal hanging in the now open space. Cherry red and oh so inviting, and when that scent hit him his toes curled, tailed twitching. Without a second thought, he leaned into the feral looking sex. His button nose rubbed against the puffy spade. It was hot. Hotter than her maw. A furnace. The taste of her was sharp, acrid but alluring. A sweetness laced through it. The way she shook when he nosed her cunny made it irresistible. With both thumbs he spread her spade wide as possible. Heat, like a hot breath, flushed past him. He saw her tunnel clench on nothing, his sister whining, trembling from this barest of touches.

He moaned a little at that ripe scent, and, like a man dying of thirst, buried his face in her cunt. That spade wrapped snugly around his button-nosed muzzle. His tongue, much smaller than hers, still made his sister whine as he tasted her vent. That heat, his tongue felt colder than her sex, and he wondered if she felt it, too, as his palette became soaked in her juices. Her nectar, pungent and thick, became his world. He practically quaked against her as he lapped up her fluids--muzzle and whiskers quickly becoming sticky with her arousal. He swallowed it as it pooled in his mouth, and she just quivered and whined beneath him. Her whole body was one long string of tension, her brother totally lost in her taste, scent, heat...

"Seb!" was Penny's only warning before she came with a keening whine. That spade clenched so tight it forced him out. He could only tongue that puffy sex while nectar leaked in spurts. A few, shuddering seconds of sweet climax that he devoured before she growled, "I need your cock!"

The harsh, guttural sound broke Sebastian from his worship. He got up, knees a little wobbly as he did. This time he did not bother wiping off his muzzle. He loved the way her scent and taste soaked into his fur and flesh. He wanted to be smelling her for days.

His slutty sister wagged her bottom. She pushed her knees together, raising her butt higher, and he mounted her, practically straddling her rear as he lined his cock up with that spade. Despite how big she was, his dom nature had come out in full force. He grabbed a thick tuft of fur along her back as a handhold and vowed, "I'm gonna fuck you senseless, slut."

Penny opened her mouth to respond, but his cock cut her off. His massive endowment more than made up for their size difference; her spade almost too tight. He forced the entire length of his cock inside her in a single downstroke, feeling the spongy barrier of her cervix. His balls and hips came flush with her messy butt, spade, and thighs, smearing her cum into his fur. She was hot, insides practically wriggling across his length. He grit his teeth and started rutting her.

Thank fuck she already made him blow his load once. Sebastian was pretty sure he wouldn't have lasted a minute otherwise. Instead, the wet plap plap plap of his pendulous balls smacking her spade went on and on. He collapsed across her back, fucking her like an animal, and Penny lost it. Her cunny rippled and clenched, squirting around his cock when he pulled out. She drooled on the carpet, tongue lolled out as he bred his sister's hips. He had no idea if he could knock her up like this, but, with the ripe smell of heat only growing stronger and stronger, he wanted nothing more. He needed to knock his sister up. A deep, instinctual hunger. This big fearsome bitch had totally submitted to his cock, and he would reward her properly.

Penny's body rocked back and forth on the carpet as her brother fucked her rough enough to bruise most women's cunts. Not hers. That stabbing, fearsome prick only stirred pleasure in her spade. The flushed mound clenching so tight it threatened to shove him out at times as orgasm after orgasm wracked her body. Her brother fucked so good. She'd known for years he had a big dick, but had she known he was this good? She might have let this happen sooner. Not that she meant for it to happen now, but she could not complain. Her heats could be so bad, but she had no doubt the next fews days would be hazed and riddled with pleasure.

Her heated sex was too good. Teeth grit, rutting her furiously, his cock churned up her sex till both siblings were sloppy messes. Her cum matted both their thighs, left a pool on the carpet, and Sebastian could not take it. He buried his face in her back, his quavering moan muffled by her fur. His nuts drew tight and he came hard.

Penny felt her brother's beast taming cock flex inside her. Seed, fertile and thick sprayed inside her. Rich gouts of virile spunk, her brother's flooded her vent, spurted against her cervix, and spilled into her ovulating womb. She whimpered, feeling it, feeling him. Her whole world his body quivering against hers, his nuts lifting in a rhythmic clench, desperate to sow life in her spade. She clenched him tight to hold him there, seeing white, feeling a moment of relief as her brother's heavy, productive balls dumped their thick load inside her. His sperm, her brother's sperm, practically swimming inside her. Despite her best efforts, it leaked around her yawning spade, that fat meat not enough to seal in all that cum. So much. Her brother... such a stud... her stud.

***

Sebastian was not sure how many times they fucked that night. He came inside his sister another two times before they both had the sense to move to his bedroom. There she rode his cock while he lay back, shaft practically aching from overuse, as she coaxed another load to mark her cum-filled womb.

It happened in a blur of pheromonal passion. He might have been convinced it a dream, if he did not wake late on Saturday, a Penny shaped lump under his sheets and between his thighs. He sighed, light filtering in through the blinds, and tugged off the covers. Penny had her much smaller body pulled up against him, his morning wood cradled in both her hands. She needed both to heft his girth while she gently licked up the tip of the shaft.

"P-Penny..."

"Mmm, morning big brother."

"I... fuck last night was real?"

She kissed the tip of his cock, thumb rubbing against his urethra, digit getting slick with precum. "Do you not want it to be?"

"Fucking hell Penny. Are you on the pill?"

"Hehehe, no," she said it like a child caught doing something naughty.

"Shit."

"Are you mad at me?"

"Yeah?"

"I have a way to make it up to you," Penny said, getting up and crawling around him. She swung her hips over his face, getting into a sixty-nine position. "We've already gone this far, why not just revel in it?"

He stared up at her cunny. Her anthro labia had puffed up, clit exposed. She did have this nice, round ass, and he could like a chubby girl. Especially if they were as slutty as him. Horny as him. And what better match to his libido than his sibling?

"Well Seb?"

Just like last night, he barely fought it, succumbing to his lust. He buried his snout into her muff, which still carried his cum, and took deep breath of their combined, succulent sex. Consequences be damned--wolf or rabbit, he needed her as much as she needed him.