Shenanigans 
By DarkFox

BEEP BEEEP BEEP BEEEP BE- Crack.
	Jake groans as he pushes himself upright, a paw coming up to brush his long black hair out of his face to shoot a glare at his alarm clock before he slips out of his bed. He takes a moment to stretch, his white tipped ears flicking towards the bathroom.  He could hear the shower running already. Jalie, his serval step-sister, must have woken up before him, and was already hogging the shower.  Too bad he didn’t have time to wait for her if he intended not to miss the bus to school today. She’ll just have to put up with him brushing his teeth and getting ready while she showers. His white tipped tail flicks with irritation at the thought, even as the black fox makes his way to the bathroom.
	Jake would come to regret that decision almost the moment he pushes open the door. Jalie doesn’t notice him standing there in shock, to busy stifling her soft moans as the pulsating jets send pleasure shooting through her every time they strike her clit, the puffy lips of her heated sex on full view to her astonished brother. Her obliviousness doesn’t last long before she opens her eyes and sees her brother standing there. With a scream, she nearly pulls the shower curtain off its rings as she tries to wrap it around herself, far too late to conceal what she had been doing. The silence lasts nearly a full minute, with the curtain doing little to conceal her black spotted brown fur and soft breasts, glistening with water from her shower. Even the steam around her seemed to frame her curvy frame. Green eyes, same as her step-brothers, wide with horror at having been caught. 
“Uh… That… That bad sis?” Jake asks jokingly, barely able to tear his eyes away from her almost fully exposed body. 
“S-shut up!” 
	Jake is forced to duck as Jalie throws a shampoo bottle at him, her cheeks burning bright red with her embarrassment at having been caught in such a compromising position. Her expression, though, is one of fear, more horrified at the thought of her brother possibly telling their parents what he’d seen, or worse saying something at school. She was supposed to be on suppressers for her heat, to prevent this very sort of thing, but she hated how they made her feel. They always made her feel sick, so she had stopped taking them just 2 days into her heat and had started using the shower to sooth the itch between her legs. That was even why she had been up before her brother! Each day it had been worse, and taken longer to sooth the heat in her belly, and today it seems it had taken to long… Now what would she do?!
	Her brother reaches up to rub the back of his head, a flush crossing his own cheeks as he nearly voices her fears for her. “Do uh… Does mom know you’re off your suppressors? The whole bathroom reeks of your heat sis…” 
“N-no… Don’t tell her Jake, please! They make me feel sick! If she finds out she’ll probably start putting them in my food or something!”
	Jake sighs at his sis, shaking his head just slightly “What will you do if your uh… showers, aren’t enough? You know it’s going to get worse right? What if you lose control at school and some dumb jock takes advantage of you?!”
	Jalie flushes even deeper at the thought, and for just a second the image flashes through her mind of some strong, muscled jock leaning over her. Those toned muscles and sweaty fur… of what it might feel like with him between her legs. Jalie stifles a moan, her thighs clamping together and rubbing against each other. Damn him, with her shower interrupted it was worse. A lot worse. Why did he have to be right all the time?!
	Jake doesn’t miss that moan, his eyes narrowing almost the same time she shoots a glare at him as if blaming him for the thoughts shooting through her head. “Right, you better stay home or-“
Jalie cuts him off, “Dad will KILL me if I skip school and you know it!”
“Hah! They’ll BOTH kill you if some boy you don’t even know knocks you up!”
“Not gonna happen!”
Jake steps into the bathroom as he shuts the door behind him before walking up to his sis, his paw coming up to set a single fingertip against her chest. “I heard you moan when I said it the first time, do you think you could even resist if they tried something? Your heat is in full swing sis! I don’t want to see you get hurt like that!”
Jalie looks like she’s about to yell at him again, only to pause at his last words. “… I won’t let them, I just… need to take the edge off first and I’ll be fine…”
Her brother just folds his arms at her words, his eyes lingering on her for a moment. As the fight and embarrassment had gone out of her she lowered that shower curtain, so he could see most of his sis now. It wasn’t like he hadn’t seen it before, several times since their parents had gotten married a few years before, the scent of her heat still affected him and he had to admit… she looked nice. “That shower head isn’t going to help and you know it. You’re too far in your heat for that, am I right?”
Jalie nearly growls at him, but she can’t refuse his words either. Her ears fold back as she glares “T-then I’ll borrow one of mom’s toys!”
“She’d kill you” Jake states bluntly. “Then put suppressors in your food anyways.”
“Then what do you suggest?!” Jalie nearly yells, before shooting a look at the door for fear their dad would hear them. At least mom was at work; she’d have come check on them by now! Jake’s was a lot more laid back, as long as they weren’t late out the door.
Jake would hesitates, glancing at the door as well, but for different reasons. He steps over to it again and reaches up to lock the door, earning a confused look from Jalie before he speaks “I can help you…” he murmurs in a hesitant and low voice.
“WHAT?!” Surely she’d misheard him? He wouldn’t really suggest that! “You’re my brother!”
“STEP-brother.” Jake replies forcefully “At least I won’t knock you up! I can take the edge off, pull out and finish outside you. It’ll give your body what it needs a lot better than that showerhead, I bet I can get you off a lot faster too!” His arms folding as he tries to summon that confidence he’d been practicing for so long. He’d intended to try it with a girlfriend, but so far at least, hadn’t found one.
Jalie stares at him in shock, mulling over the idea in her mind. The hormones of her heat certainly made it sound like a good idea… It would take the edge off, he wouldn’t get her pregnant, and she’d feel good too! “… IF I let you, you can’t tell a SOUL or I’ll kill you myself! IF I let you, you have to be careful not to knot me or we’re BOTH dead.”
It was Jakes turn to flush again, just nodding to each of her demands. As if he’d ever tell anyone he’d fucked his own sister. He’d be a pariah; they both would… and yet, as she slowly lowers that curtain and he looks her over again, he can’t help but think it might even be worth it. 
Jake steps into the shower with his sis, glancing down at the still running shower head before murmuring “You won’t need that anymore then…” His paw comes up to rest on Jalie’s hip, embarrassed, hesitant, but before he can even get any further Jalie turns around and places her paws against the shower wall, her eyes half lidded while she tries to pretend she wasn’t about to let her brother be her first 
Jalie growls softly at her brother, “Just shut up… and do it. Before dad comes looking for us…” 
Jake huffs to himself, yet as his sisters bushy tail draws to the side and exposes the puffy lips of her sex, his disappointment at her response vanishes in an instant. He hooks his thumbs into the sides of his pajamas, pulling them off and tossing them out of the shower unceremoniously before stepping up behind his sister once again. This time both of his paws move to her hips, curling his fingers around those perfect curves to draw her back against him just enough to wedge his sheath between the cheeks of her soft rump. His hips rock slowly, grinding his half hard length against her with a low groan under his breath, and it wouldn’t take long for the rest of that length to start sliding out of his sheath. Anticipation building in him with every passing second. He was about to fuck his sister… just an hour before he would never have believed it.
“Pervert…” Jalie murmurs softly, yet there’s no anger left in her voice. It felt good, even when he was just rubbing against her ass, each grind making a small shiver shoot through her. She can’t help but rock her hips back against him, meeting her brother’s motions while she tries to hold back the soft moans in her throat, not wanting to show how much she was enjoying his touch. She keeps telling herself it’s just her heat making her want this, but part of her knows that’s not true. She’s always known her brother was attractive, but he was, after all, her brother and had always been off-limits… and now here he was, inching closer to her fertile sex.
Slap. That length had finally slipped off her ass and slapped up between her legs, making her gasp and utter a moan she couldn’t hold back the first time his length touched her puffy sex. Her head turning down to see it, and her eyes would go wide at the sight “You’re huge!” She turns bright red, realizing what she’d just said, but she can’t take her eyes off that length now, easily 9 inches long and an inch and a half thick, before the knot. It was bigger than the jock she’d imagined moments before and was now grinding between her legs, against her sex. Each rock of their hips against one another was now sending pleasure shooting through her, she couldn’t stop now even if she wanted to…
Jake can’t help but grin at her words, pride and ego swelling even if it was his own step-sis who said it. The tapered tip of his length wedges against her sex as he leans over her, his chest pressing against her back while he whispers into her ear “I’ll go slow… you can take it…” his fangs brushing the very edge of her ear when he starts to push forward into her. His groan escapes him low and soft while he inches deeper inside of her with each second, sinking that thick, turgid spire past the outermost lips of her sex and into the sweltering heat of her velvet folds. God it felt good. 
The moans of his sweet sister are like music to his ears, she couldn’t hold them back anymore when she finally felt the thick, warm length of a real cock sliding into her for the first time. It was so big, and stretched her walls to fit him inside her, but it felt… incredible. He goes deeper and all she can do is push back against him for more. She knows it should hurt for her first time but… she doesn’t feel anything but bliss with him inside her.
Their bodies meet with a soft slap as that first stroke finally ends, just as his tapered tip nudges her cervix and his unformed knot, little more than a bump at the base of his length for now, slips into his sister for the first time. It feels incredible, indescribable, to be deep in the wet heat of her body. His hips draw back and that next thrust comes much more quickly than the first, the thump of his hips against her own rocking her forward against the shower wall while she just moans for him. Again and again their bodies meet with lewd, slick sounds as his length plunges in and out of her. That spire twitching in her depths, painting her walls with precum. Neither of them are thinking clearly enough to remember that even his pre could get her pregnant.
As Jake hilts in his sister each time, that knot at the base of his length would grow thicker, and somewhere in the back of his mind he remembers he is supposed to be careful not to tie her, but the velvet grip of her sex rippling around him makes it hard to think of anything else. He could even feel his tip nudging her cervix with each stroke, wedging into her womb a little bit at a time. The heat around him was amazing, the way her folds suckled on his length and milked him was unlike anything he had ever imagined. He wanted- no, needed more. 
The slaps of his potent balls against her clit only send more pleasure rushing through Jalie, she’d known sex would feel good but had not guessed it would feel this good. The showerhead was nothing like this, no toy she’d tried felt like this either. It was warm, and twitched inside her every time he hilted. The bulb at his base applied such heavenly pleasure against her clit as it popped inside her again and again, making her forget the risks they were taking every time it slipped inside her quivering depths. She feels a subtle ache of being stretched and molded to fit her brother’s cock, deeper inside too as her cervix slowly gives way to the tip of his length pushing into that sweltering and dangerously fertile womb…
Jake almost yelps when his knot catches that first time, making him pull at it for a moment longer before it comes free again. That should have been his warning, his cue to stop. The feeling had even been enough to make his sis cry out for him, those walls squeezed so tight and god they felt good as they rippled around him, milking his cock while his sister cums on his length, her juices gushing down her thighs even as her brother plunges forward. She forgets to tell him to pull out, and a moment later as his knot pops inside her once again and her spasming walls clamp down on that bulb, it wouldn’t matter if she did. 
He didn’t stand a chance after that. He tugs back, only to find himself stuck, lodged deep inside Jalie. His tip pushed just slightly into her womb, every inch of his bare cock claimed by his step-sister. He cant pull out, and is no longer thinking clearly enough to remember why he should. His hips jerk forward against her and pull back in hard, rapid strokes, rocking her body beneath him each time he tugs at his knot just to shove a little further into her. Once, twice, almost making it to five strokes before his cock pulses.
Jalie almost screams, barely remembering their dad might hear and biting her lip as she cums HARD on her brothers cock for the second time. She feels that pulse, had felt something splash in her belly. Jake just erupts inside her with rope after rope of potent cum flooding into her womb. She swears she can feel the sticky thump of sperm soaking the walls of her womb, right in the middle of her heat, filling her to the brim and ensuring that her heat would be ending early this time… Each pulse of cum pumped into her womb sealing her fate to be bred by her own brother… and it felt so good. 
Jake pants heavily against her shoulder, leaning over her and bucking gently forward with each new rope of cum he empties into his sister’s belly, instinctively doing his best to knock her up. He groans softly against her throat as that flood of warm seed slowly tapers off, his knot keeping them both locked together. The two share a sinking feeling, knowing it would take nearly 15 minutes before his knot would shrink enough to pull from inside her, and their dad could come up to check on them at any minute…
Luck was on their side. The time passes in relative silence, save for the occasional moan when Jake or Jalie shift against one another, stirring the warm seed pooling in her womb and grinding his cock against the over stimulated walls of her sex. As Jakes knot shrinks he pulls back a little bit at a time, working himself out of his sister’s cum-stuffed snatch till they feel the soft pop of the bulb coming free. Jake can’t help but watch as his cum gushes from his sisters gaping sex, creamy white spilling across the shower floor. Some of his load even runs down along her inner thighs, staining her fur and marking her with his seed. Jalie’s gaze lingers on her brothers cum matting the fur around her pussy and thighs, her eyes glazed over with the lingering afterglow even as she whispers…
“We’re so dead…”