Momo Is An Onahole Little Sister

With your father's abrupt disappearance from Kurogaya to be with some new woman, you no longer have to worry about him learning that you've stolen away his wife and mistress and made them your own lovers. The downside, however, is that Kimiko has to work much harder to make up for his absence, and you have to study far more on how exactly to take over the business to get into it as quickly as possible, rather than some vague future when your father retires.

As such, you're in your room working over the past few years tax forms to try to get a handle on things, consulting online as you pour over the forms, when Momo enters the room.

"Hi, Nana-kun," she says, waving her fingers a little as she approaches. "What are you doing?"

"Work stuff," you tell her, absently, trying to nonverbally tell her to leave you alone.

"It must be hard, having to do work stuff all day with Dad gone," she says, her voice soft and somehow having a hint of seduction. "I bet you're really pent up, from working so hard."

"I'm not that pent up," you tell her.

"Are you suuuuure?" She asks. "I bet you reeeeally want some relief, Nana-kun. All that work... Dad really left you with a lot of responsibility, didn't he? But he also left you with his daughters and his wife and his mistress, and me." She leans over to kiss your cheek, her lips dainty as they press against it. "If you think about it, it's almost like I was born just to please you," she explains.

"I don't think that's true," you start, but rather than responding, Momo simply slides in between your thighs without any further ado, pulling out an onahole from her back pocket, starting to unzip your pants. You briefly rub the brow of your nose as you consider just telling her to stop and leave, but in truth you actually are a bit pent up and having a little relief from Momo doesn't seem like that bad an idea. She pulls out your cock, stroking it for a little bit with her own small hands, before putting the onahole in place atop it, starting to jerk you off. It's open ended, so each time she pulls it all the way down, the tip sticks out, and she leans forward to kiss or lick it, staring up at you with her lovely eyes.

"Does the onahole feel as good as a real pussy?" Momo asks, staring up at you breathlessly, her lips parted. "I bet it doesn't," she notes, kissing the tip. "I bet it's all plasticky and cool, not like a real woman's pussy, which would be all wet and warm. Maybe you should call in Minori, and I can use her to jerk you off instead?" She has a teasing note to her voice, but you don't doubt she'd gladly do that if you gave her the opportunity. Her fingers continue to stroke the onahole along your cock, her lips wrapping around the tip, slurping and drooling as she does so, letting drool fill up what parts of the onahole aren't full of your cock as she jerks you off like that.

You can't really focus on your work by this point, so you just lean back in your chair and stare down at her, the smile in her eyes making you reach down to dotingly run your fingers through her hair as she slurps on your cockhead like it was the tastiest thing in the world, drool slobbering out onto your dick. You just watch her work your dick over like that, little fingers squeezing and relaxing the onahole, letting the endless cascade of drool soak into it as she does so, her soft hums and moans adding to your pleasure as her tongue laps at the tip of your cock as it rests in her mouth.

"That's good, Momo," you breathe out, smiling down at her. "You're my favorite half-sister," you tell her, making her blush and smile before she realizes that she's your only half-sister.

When she does, rather than getting mad, she gets aggressive, tongue lapping rapidly at the tip of your cock, making you groan, fingers digging into the armrests as you enjoy the hot feeling of her mouth on your cock. It doesn't take much of that for her to come, moaning around your dick, trying to slurp more of it in as she slumps forward, her nose lewdly pressing into the onahole as it squishes up to accept her sudden forcefulness. She squirms and moans around your cock, eyelashes fluttering as she lewdly stares up at you, until she pops off just as suddenly as she took it in.

"Are you sure you don't want Minori to come in and get used as your little sister onahole?" Momo asks, breathlessly, staring up at you. "Maybe Sumiko could come, she really likes being a human sheath, doesn't she?" Your cock twitches in the onahole, some of the drool splashing out onto the floor as she jerks you off. "This onahole can't compare to them, can it?"

At that point, you release, groaning as you ejaculate, splattering a thick load of cum onto her waiting features. She smiles and closes her eyes, basking in your scent and your thick cum as it smears all over her face, painting her skin with your sticky seed. She breathes through her nostrils as she takes it, eyes closed, and when you're completely spent, she starts to lick and lap it up from the region around her tongue, her eyes forced closed by the semen that's sprayed across them too.

You could scoot her out of the room, now, or even just have her lie down on the bed, but seeing her like that, face lewdly stained with cum, makes you grab her under the arm and drag her over to the bed, practically tearing off her skirt and panties to reveal her dripping wet sex, which you promptly slam your still-hard cock into, enjoying as she squeals in surprise, eyes opening wide behind the lewd staining of cum that's coated her features. You grunt as you slide up her shirt a little to take hold of her hips, starting to simply fuck her like it was all she was good for, and she squirms on your dick in pleasure, panting noisily.

"You make a much better onahole than Minori or Sumiko," you breathe out, as you pump in and out of her with increasing force, enjoying her body writhing on your cock, her fingers digging into the bed, her heavy breathing accompanying each squirming movement of her butt on your cock as you fuck away with relentless force and power.

She nods quickly. "I'm your half-sister onahole," she agrees. "Mom basically made me just to have sex with you!" She says it without a hint of hesitation, and you just groan as you start to fuck her harder, pumping in and out of her tight cunt, making her slide forward and backward on the bed, her legs hanging off it as you fuck away. She can clearly tell how much you're enjoying the lewd words, because she keeps going. "Do I make a nice sister sex toy for my big brother boyfriend?" She asks, wriggling her ass on your cock.

"You do," you growl, your fingers digging into her skin, increasing your pace inside her, fucking her ever more roughly, the bed squeaking as she slides around. "You love being a little sister sex toy, don't you?" Momo's cheeks burn, but she nods quickly, closing her eyes as you fuck her. You reach up for her hair, gripping it and shifting her weight, clambering onto the bed with her still on your cock, forcing her along, her back arching in a way that makes your cock twitch inside her wet cunt.

As you fully get on the bed, the treatment has pushed Momo over the edge, and she orgasms on your cock, moaning as her juices cascade around your cock, coming out thick and fast as you fuck her, your own dick lodged firmly inside her waiting sex, your fingers squeezing down tighter and tighter onto her hips. She pants and squirms on your cock, as you groan. "Ah, fuck, your onahole pussy feels really good on my cock," you tell her, as her cunt squeezes and grips and massages your dick, and she just pants and nods, eyes rolling up. You reach around for the front of her blouse, undoing the buttons as you continue to fuck her into the bed, enjoying the smear of cum that's left on the sheets as she scrapes along the surface of the bed.

She licks her lips again, panting, leaning up a little as she recovers. "It's the best," she breathes out. "It's custom-made for you, Nana-kun," she adds, glancing back over her shoulder at you. "It's been personally shaped to your cock, making it the best onahole pussy in the whole house." You groan at those words, driven to increase your pace inside her in response, her fingers clawing at the bed as she squeaks and tries her best to take it all. "It's always available for you!" She manages to squeal out before her next orgasm, her body collapsing back down onto the bed, her pants noisy, her butt wiggling around on your dick as you fuck away at her.

"I definitely love my little sister sex toy," you tell her, as you pull her blouse off, your hands going up to her modest breasts, still not having yet grown in, your fingers squeezing at the flesh of them, while she just drools on the bed a little from the sheer force and roughness of your cock. "I can't wait for you to get your tits in, so I can use them as another hole to fuck, just like I can with your mother."

She nods rapidly, swallowing audibly as she struggles to speak, under the assault of both pleasure and the simple force of your cock pounding her over and over again. Her body squeaks along the bed as she swallows and claws at the bed sheets, before she finally manages to speak up. "M-Mom made me, to be, your personal, onahole," she explains, breathlessly. "She'd be so, h-h-happy, you love, my onahole pussy!" She then squeals out in orgasm, her cunt convulsing on your dick, a hot splash of her juices raining down on the bed as you fuck away like that.

From that point on, she starts to come too quickly to offer any commentary on your rough treatment of her sexy nubile body, your cock just relentlessly pounding away as you fuck her, your fingers digging into her waist as you use her like your personal sex toy. She squeaks and squeals in each progressive orgasm, a smear of cum rubbing on the bed sheets, a puddle of her juices forming between her knees, and all the while you feel her up, playing with her tight little butt and her cute breasts.

When you finally do orgasm inside her with a low groan, she wears a sleepy, fucked senseless smile, and your fingers dig into the flesh of her hips as you hold yourself down inside her, spraying a thick load of cum all over her insides, your semen desperately trying to make a passage into her womb that's doomed to failure.

You pull out, and she simply breathes, a satisfied smile on her lips as you flip her onto her back, dragging her up to rest her head on the pillows. By the look on her hot cheeks, she clearly expects that you're done with her, but you're definitely not. You soon position yourself between her legs, take a firm hold on her thighs, and slam your cock into her once again, making her squeal in pleasure, eyes rolling up, her cute face lewdly smeared with your cum as you pump in and out of her well-used pussy.

"Make a show," you tell her, panting. "Since you're my sex toy sister, show off all your features, make me want to keep fucking you."

She nods rapidly, fingers coming up to her face first, capturing your semen with her fingers and then feeding them into her mouth, which she opens wide, tongue bouncing around in an enticing fashion as you fuck her tight body. The whole time, she's bouncing on your cock, your fingers dug firmly into her thighs as you abuse her hot young body. "Nana-kun," she breathes out, with bedroom eyes, once she's slurped down every drop of your semen she can get to. "Nana-kun, your little sister onahole, she loves you, and she loves your cock," she says, speaking about herself in the third person, pushing you on in that manner.

"She loves being marked with my cum too, doesn't she?" Momo nods quickly, orgasming at the mere thought, her cunt convulsing on your dick. You take hold of her hips, lifting her partly up off the bed, her legs soon snapping around your hips as you start to fuck her directly into the pillow and headboard. Her body twitches in ecstasy in the glow of her orgasm, as you enjoy the view, her soft stomach, her lovely skin, her petite breasts, her perky nipples, her light bush, all put on lewd display as you fuck her into the bed, her pants growing noisier.

When she catches her breath, her face now clean, she opens her mouth wide, letting her tongue dance around invitingly in her mouth, seeming to beg you to fuck her cute little mouth. Her fingers even come up to her mouth pressing against and playing with her tongue, an act that simultaneously combines masturbation and sexual display, showing off the mouth you could be fucking if only you took your cock out of her cunt.

You don't, though, focusing on fucking her into the bed, letting her head bonk lightly against the head board as she slides forward, before yanking her back, still on your dick, and startnig the process again. She comes again and again like that, each time taking a little less time, her sex squeezing your dick, splashes of her juices raining on your stomach. You pull off your own shirt, and her eyes go a little wild as she takes it in, her fingers still toying with her tongue in one of the lewdest sexual displays you've ever seen.

When you finally do ejaculate inside her waiting sex, she squeals around her fingers, her hips bucking, another fresh squirt of her juices splashing onto you as you unload inside her, filling her up to the brim, so much that plenty squirts out from just how tight and full she is. When you pull out, some spills out, creating a lewd little mess between her thighs as she drunkenly stares up at you, licking her lips invitingly.

You're not done with just that, though. You move over to her face, grasping her hair, and unceremoniously force her mouth down your cock, silencing her even as she twitches in pleasure, panting and moaning around your cock. "That's a good little sister onahole," you breathe, fucking her mouth. "Good onaholes don't talk, they just suck and get used," you tell her, running your fingers through her hair as her throat bulges with each progressive thrust, as you profane and defile her throat and mouth with your thick cock, as you roughly and crudely use and abuse her.

She gurgles around your dick, a fresh orgasm sending a small spray of your cum and her own juices out of her cunt, and you grip her, dragging her around on the bed until her head is hanging off the side, your cock never leaving her mouth for a moment as you get her in a better position to fuck her throat. You pump yourself in and out of her mouth, your balls slapping against her nose, your hands running along her naked body, her bare tits, her stomach, even squeezing her thighs and ass occasionally. She's on lewd display, ready to be used, and she's absolutely happy to be so used - eager, even, by the way her tongue dances around on your cock, by the way she slurps on your dick.

You just fuck away like that, playing with her breasts, your breathing growing heavier. She comes around your cock, her legs kicking into the air as she gurgles out her pleasure. Your hands tweak her nipples as you fuck her wonderfully tight throat, pounding away, your balls slapping at her nose as she takes it all, struggling even to moan as your cock plugs up her throat again and again.

"You want to be my little sister onahole, don't you?" She nods around your dick, twisting it in her throat, adding to your pleasure as she sputters around it. "You're my happy little sister onahole. Give me a thumbs up," you order, and she raises her hands up, giving you thumbs up. "Now give me a double peace sign, put them next to your head." She does that too, and the sight of her lewd little body, naked and eager, pushes you over the edge, and you pull out of her throat, splattering a thick load all over her face. You groan as you ejaculate, enjoying the feeling, and the sight of her newly messed up features. While you're coming, she retains the double peace sign, but once you're done, her fingers come to start scooping up the cum again. You stop her. "Don't," you say. "I want to leave my little sister sex toy a total mess."

She nods drunkenly, panting as she recovers from your rough use of her mouth, and you take hold of her thighs and drag her further onto the bed, shifting her to rest on her side, one leg draped over your shoulder, and angle your cock at her butt. When you push your way inside, she squeals in pleasure at your sudden intrusion, panting and jerking beneath you, her gaze turning limply to you, her cute face still coated in a thick load of cum. "Go ahead and talk," you tell her.

"I'm your, little sister, onahole," she pants out, fingers clawing the bed as she takes all of you inside her tight ass, before you begin to pull out to slam again. "All my holes, are made, for your cock," she pants out, breathless as you fuck her tight ass, her cute little body squirming on your cock before she orgasms on it, her eyes rolling up, her face stained white with your seed as her cheeks grow hot with arousal, her hips bucking against you as her toes wiggle next to your ear.

Your fingers slide gently along her bare stomach, feeling the taut little thing as you fuck her ass. "And I really like my little sister onahole," you tell her, as you fuck her harder. "I like using it like a cute little masturbation aid." She moans in pleasure at that, her fingers clawing at the bed to help keep her on her side like this, trying their best to hold her in position as you fuck her rough and hard. "Do you like being my little sister onahole? Tell me how much," you say, as you give her a particularly rough pound, rooting around inside her ass with your cock.

"I luh, love being Na, Nana-kun's-" she swallows, her voice stuttering from the feelings in her butt, "-little sister onahole," she manages to moan out, before orgasming again, her eyes rolling up. You start to slowly pull out, holding her by the ankle as you do so, enjoying the feeling of her hot cunt on your cock. You fuck her harder at that point, fingers digging into her leg, your other hand grasping her by the hip to hold her in place as she shudders and twitches on your dick, her hot breaths interrupted by the repetitive movement of your cock inside her.

You root around in her ass for a while more, before shifting her back onto her back, enjoying the delirious look on her face as she drunkenly stares up at you. "I'm fucking my little sister onahole's ass," you breathe out, gripping her thighs, pulling them up again, resting her ankles on your shoulders. "All your holes are my personal masturbation aids, for me to use to jerk off, isn't that right, Momo?" Momo just pants and nods, unable to verbally respond as you pound her tight little butt over and over again, enjoying the feeling of it wrapped taut around your dick.

You fuck her ass like that for a while more, making her come again and again, her tight sphincter getting tighter each time she convulses on your cock, some of her juices spraying out of her cunt from time to time, bringing with them a little splatter of the thick loads you filled her up with. When you finally unload in Momo's ass, she's a panting, sweating wreck on the bed, shivering beneath you, her expression lewd and sexy as you stare down at her, brushing your fingers along her young, nubile body, your cock remaining firmly in her butt, her legs resting on your shoulders.

You take a long moment to stare down at her as she lies like that, her breathing heavy, her cheeks hot, before she speaks to break the silence. "I hope my onahole body is good," she says, softly. "Are you done, Nana-kun? I only want to make you feel good..." She says it in a way that makes it sound like what she really wants is for you to keep fucking her.

You growl at that, grasping her by the thighs and shoving your cock in between them, pushing them together fucking between them like they were her cunt, rubbing her clit with the underside of your cock as you do. She pants and squirms in response, her cheeks hot, her eyes rolling up as you start to fuck her, fingers digging into the bed as you give yourself a thighjob with her body, orgasming soon enough on her own. "I can't wait for you to get tits like your mothers," you breathe down at her, and she just quietly nods, panting. "I'll be able to use them as onahole breasts, fuck your tits just like I do your mom's," you growl out, and she nods.

"Suh, sorry," she sputters out, panting, as you fuck her thighs, grinding your balls against her cunt, teasing her clit with the tip of your cock, as you fuck in and out of her.

"Don't worry," you tell her, your voice soft and soothing. "I like you just like you are, and am happy I'll get to see your breasts come in, and use them every step of the way." You hold her legs together with your upper arms, your hands reaching down for her perky little nipples, playing with them as she bites her lip and moans. "Getting to watch my little sister onahole grow into the role is better than having one that is already filled out."

She moans as she comes, fingers digging into the bed, thighs quivering around your cock and massaging it in an interesting and pleasurable way, your dick jerking a little back and forth. You've already come a number of times, though, so you're not about to orgasm just yet. It takes a lot of fucking her thighs, teasing her cunt all the while, making her orgasm a good dozen times, before you finally let go all over her stomach, splattering yet another thick load across bare skin, marking her as your own.

Then you flip her onto her belly - or, more accurately, onto her shoulders, careful to keep her stomach above the bed as you grip her by the hips, shifting her so that she rests on her knees and shoulders, her head turned to one side, leaving a thick smear of cum along her cheek as she glances up at you out of the corner of her eyes. You press your cock between her butt cheeks, gripping them in either hand and starting to fuck her ass. "You do have these, and they're fun to play with too," you tell her, and she wiggles her butt just a little as you do so.

She swallows and pants. "Ah, Nana-kun," she moans out. "Thank you for finding all these ways to use your little sister onahole. It makes her feel special to get used like this, rather than fucked once and discarded like a normal onahole."

You give her ass a quick spanking. "You're a very special onahole, don't you ever forget it," you tell her, pumping in and out of her ass. "Your mother only came into my household because she was pregnant with you, and I still remember her belly swelling with you in it. A home-delivered onahole, just for me, and I didn't have to do anything to bring you into the household, did I?" She whimpers and shakes her head. "You had a crush on me before I ever approached you, and do you know why? It's because you were born to be my onahole, and deep down, you always knew it."

She mewls and comes at those words, her fingers digging into the bed, while you keep hotdogging her lovely little rump, squeezing her butt cheeks around your cock as you pump up and down. You have to work pretty hard to get yourself to come like that, fucking away, your balls slapping against her sex as you use her butt just like you used her ass, pumping away roughly at her tight little body. She orgasms several more times, panting and moaning, before at last you come, spraying out your ejaculate all over her back.

You pull back, panting yourself, admiring her body as she rests there. "Rub it in," you order. "Rub my cum all over your body, get your skin slick and shiny with your big brother's cum, so you look like the sister-onahole you were born to be," you tell her. Her hands start to move, slowly and languidly rubbing along her stomach, smearing the cum there in thoroughly. Then she reaches for her back, doing the best she can to rub it in, but you wind up having to help her, smearing cum all over her bare skin until she looks nice and shiny and slick.

Once that's done, you offer your hands up to her to quietly lick and suckle, while she just quietly pants on the bed, limp and pliant, sucking and slurping at your fingers as her own rub all over her face to smear in your cum, her eyes closed.

It's only once your hands are clean that you grab her by the thighs, shifting and twisting her around so she rests her head over the edge of the bed, her mouth popping open. You thrust into it, taking a firm grip on her throat and just fucking away, making her gurgle and pant, legs kicking at the air, an orgasm soon rushing through her body and making her moan around your cock. You groan, pumping harder and harder at her tight little mouth, balls slapping against her nostrils, and she keeps coming, orgasm hitting after orgasm, her nostrils drinking in the thick smell of your cum and musk as you fuck her cute little face, as you stare down at her slick young body, as you practically jerk yourself off with her mouth and throat.

You're rough with her, pounding away at her little onahole throat, groaning as you fuck her, enjoying as she twitches and writhes from your forceful work in her mouth. You just use her, grinding into her throat, fingers occasionally tensing around it, and she just gurgles and jerks in pleasure, occasionally orgasming, sending a splash of her juices out between her thighs as she kicks at the air.

"You make a really good onahole, Momo," you breathe out, as you fuck her face, enjoying her little hum of happiness - cut off by your cock ramming its way back into her throat - as she's glad to hear that she makes a good onahole for you. "When I'm finished with you today and get back to studying, I want you to just lie in bed and wait for me to relieve myself with you again." She moans as best she can, your cock cutting her off again and again, clearly delighted at that idea. "I have so much pent up energy from all this damn work and study, and your hot little onahole body is pretty much made for me to fuck, isn't it?" She nods around your dick, massaging it in her throat, sputtering a little as she's choked by your constant facefuck.

You just groan, enjoying yourself, enjoying the feeling of sexual power and domination as Momo's cute little legs kick at the air, then after a good dozen orgasms go lax, resting on the bed, her body seeming to relax into a state of endless pleasure. Some mix of ecstasy and asphyxiation work together as you keep going at it, and she simply passes out, only letting out occasionally breaths through her nose as you fuck her unconscious throat.

Seeing her like that, feeling her like that, enjoying the pliant feeling of her throat now that she's passed out, pushes you over the edge, and you pull out, splattering a fresh load of cum all the way from her tits to her face, the spray coating her neck and chin alike. Once you're spent, you quietly rearrange her on the bed, gently kissing the top of her head.

Then your cock finally starts to go down, and you shove it back in your pants and go back to the desk. If you get hard again, well... that's what your little sister onahole is there for. Even if she's still sleeping, looking restful on the bed, you're sure she won't mind you relieving herself with you. She pretty much told you as much.