"Lay out flat," you tell Rose softly as you rise to your knees on the mattress.
"Like this?"
She wiggles a bit, folding her arms beneath her so she can rest a cheek on them.
You lightly run your fingers up and down her body, like an actual masseuse trying to gauge her stress points or latent qi, or whatever is is licensed massage therapists do. Your fingertips trace the contours of her spine, her shoulders, her thighs, her calves, and even the soles of her feet. She's trembling like crazy. Her body is hot to the touch.
Rose's plaid skirt has a frilled hem that ends about 4 inches above her knees. Paired with this, she wears her floofy blouse tucked into the waistband. When you tug it free, and hike it up, so that her lower back is exposed, she shudders. Rose isn't fat, but she's what connoisseurs might call "healthy," and when she lies on her front as now, her waist is extra fleshy and squishy-looking.
"I-is this okay?" She asks.
"Why wouldn't it be okay? I'm just giving you a back massage."
"If this is because of..." Rose begins, and trails off. She tries again: "If this is because of how you saw me playing that game -- I'm not -- I'm n-not a brocon... it's just a game... you know?"
You glance to Rose's PC monitor, where the game is still running, its display asking which of the little sisters you would like to visit with today.
"Kids these days," you say. "Why would you play such a dirty game? Aren't you a bit young for stuff this racy?"
She shrugs. "I'm not a kid. I... have needs too, you know. I can be into ecchi stuff same as you."
You click the toy back on. As before, she winces when she hears it. But this time it's a bit more meaningful: she has no idea what you really intend to do with this thing. Frankly, neither do you. You'll let the feeling of the moment guide you.
The magic wand thrums with vibrational energy. The ridges in its domed end become blurred from motion. You use the heel of your free hand to soothingly rub tiny circles around Rose's back, prepping her. She coos and sighs at the firmness of your brotherly massage. Then you use the toy for its ostensible purpose: you press it against her skin and start to rub it back and forth across her vertebrae.
"That... feels really good..." Rose says. "Thank you, Ally..."
She wiggles some more to increase the pressure of the toy against her body. This has the effect of wagging her ass back and forth too. Is she enticing you on purpose, or is this an accidental side effect?
Rose's room is as clean as you've ever seen it; it's cozy in here. And it smells clean, too, her bubblegum scent now overpowered by the rustic aroma of Pinesol. But as you gently run the pulsing, buzzing sex toy around her spine, another fragrance joins the bouquet, one you know quite well from your time in another world. Rose is getting turned on. Her pussy is juicing up.
Your motions, therefore, become bolder. You add your hand back to the mix, squeezing her in random spots on her waist and hips as you continue to rub the buzzing toy around. Rose grits her teeth. "Alllyyy..." she sighs, not the petulant whine of earlier, but a dreamy one. You're teasing her so awfully. When your fingers slip past the elastic of her skirt, just barely, she jerks like she's been zapped with electricity.
"Are you absolutely sure you're not a brocon?" You ask her.
She's mute, and lost in a sea of conflicting emotions. So you force the issue by grabbing her butt, through her skirt, in the most unbrotherly way possible.
She chokes. "Ally--!! I -- I'm not a brocon! I swear! Stop!"
You lean way forward, so that you're practically lying on top of her. She makes a great pillow. Still massaging her with the toy, and squeezing her ass lecherously, you put a cheek to hers. You whisper in her ear: "Too late. You might not be a brocon... but I'm a siscon."
She gasps. At that very moment, you nip her ear.
"You say you're not into me that way," you add, breathing hotly against her, and rubbing her sensually, "but you were playing this game about a guy who has sex with his little sisters... while waiting for me to walk in on you doing it. Does the idea of that turn you on, Rose?"
"S-siscon..." she mutters, mind still stuck on the prior revelation.
"It's true." You glide your palm up and down the length of her well-formed thigh. She's so meaty, and rubbery, and thick... "I've always been a siscon, Rose."
"Ally... nii-chan... you're such a pervert..."
Your fingers push past the bottom of her skirt. As expected, she wears nothing beneath.
"Have you been playing with yourself?" You ask her. You poke at her infinitely-pliable butt under her skirt. "While you played that filthy game, were you masturbating?"
She nods timidly.
"That's no good. That means I interrupted you, doesn't it?"
She nods again. You rise back to your knees.
"Don't worry. I'll massage you down here, too."
You flip her skirt up. Her smooth, round ass is out in the open. Although she's shaking worse than ever, she doesn't fight or say no. With either palm, you knead her flesh like a baker kneading dough. That's what it feels like. Your massage grows firmer and more aggressive over time, so that eventually, you're pulling her ass cheeks repeatedly apart by the force of your circular rubbing -- baring her tender holes each time. Just as you remember, they look almost painfully tight, both of them.
You stealthily unzip, and free your own genitals too. From where she lies, she can't see it happen.
"Ally, are you sure this is really okay? Are you sure we should be doing th-- hhhh-- ahhhh~~"
Her indecisive questioning dissolves into high-pitched squeals of pleasure, as you jam the thrumming sex toy in between her legs so that it vibrates against the back of her cunt. In spite of herself and in spite of her remaining qualms over the incest taboo, she bucks repeatedly against the thing, unable to deny the raw erotic thrill of having her pussy played with. You undo the velcro holding her skirt together, and let it fall flat on the bed so that she's fully naked below her blouse.
"Turn around," you instruct.
Hesitantly, she rolls over. As she does, she squeaks: "Oh my gosh!"
Her eyes are peeled on your throbbing dick.
"Look at how much you turned me on," you tell her gently. You give yourself a few long, slow tugs. "See?"
"T-that was me?"
You nod. As much as she can't tear her eyes from your dick, you can't tear your eyes from her perfectly formed pussy. It's baby-smooth, shiny with her cream, with tucked-in lips and a cute pearl-pink clitty atop it. She lies there with balled-up fists to her huge chest, totally at your mercy. So you put the wand against her hole again, this time directly attacking that throbbing pink nub above it. What can you say? You love to bully her.
"Nn-nn-nn-nnnnn," she mutters incoherently. Her eyeballs roll to the back of her skull. She clamps her meaty thighs around the toy for added pressure, but you pry them apart again so you can see her orgasm in all its glory.
"Let your big brother massage you," you say soothingly.
"Y-y-y-y-y-essss..."
"That's my good girl," you say, as she cums herself stupid, and a geyser of her sweet-smelling cum erupts in a high arc. "That's my good little sister."
You pull the toy away for a moment to watch her multiply-spurting orgasm in all its obscene glory, before pressing the thing cruelly back against her cunt and bringing her off a second time. Her second ejaculation is just as forceful as the first; so are the third and fourth. Yeah, her room smells like lemon ramune again, all right. Her bedsheets are inundated with her girlcum. She's half-unconscious, tongue lolling out, and she's got her hands wrapped around your wrist to keep you from pulling the wand off her quivering fuckhole.
When you finally wring as many orgasms as she's good for out of her, and turn the magic wand off, and she gets enough of her braincells back online to form words, she takes some gulping breaths before asking: "Do you want me to... to do you, too?"
"Who's the pervert now?" You ask, as your dick oozes a dollop of precum from the piss slit, to intermingle with her fluids on the mattress.
"We both are," she giggles.
"Which of the little sisters are you romancing?" You ask, nodding at her game.
"...Aya. She's my favorite."
Of course.
"I didn't play Aya's route," you lie. "Want to read it together?"
A few moments later, you're sitting side by side at Rose's PC, reading the VN. This thing is a nukige of the first order -- almost zero plot. There's very little connective tissue between the hardcore sex scenes; and so the two of you are being overwhelmed by scenario after scenario of a slutty little sister with pink hair doing anything she can to please her cherished older brother by servicing his dick.
Rose is only half paying attention, though, because she keeps stealing glances at your cock jutting up in your lap.
"It's... it's so big..." she mutters to herself.
Right now it's wrapped in a lubed-up silicone onahole that has an open end, the outer lip of the dicksleeve clinging to the underside of your mushroom tip. You aren't tugging on it, because you're on a hair trigger. You know that the moment you start masturbating, you'll pop off. So instead you occupy your hands by holding Rose's Hitachi for her, against her slimy pussy. You're both breathing hard through your mouths, and trying to keep yourselves from orgasming. This pleasure is too good to end so soon like that.
"This is lewd... this is too lewd," Rose says. "You're making me lewd, nii-chan..."
"Am I making you lewd?" You retort. "Or are you making yourself lewd? I'm just keeping tabs on you. You're the one who was sitting in here playing with yourself while reading hentai."
"Because... because I learned it from you..." she stammers.
"How did you learn it from me?"
"You were right," she says, her voice nothing but a hoarse and breathy whisper as you strum her clit with the humming toy. "I do spy on you... I peek at you in your room, and look at the things on your computer... I watch you with other girls, Ally..." She throws her head back and moans in her girly way as the pleasure courses through her system.
"See?" You say. "You're lewd. You're a lewd little sister... and that's just how I like it."
She clutches at the arms of her chair, rolling her head side to side, humping the wand's dome.
"Play with me, too," you say. "Do lewd stuff with me."
As if she's reaching for the third rail, she haltingly brings her fingertips towards your waiting prick, and the tube of silicone wrapped around it.
"Just like that," you say encouragingly. "Massage me too."
Together, you and Rose, onii-chan and imouto, masturbate each other.
Her spindly fingers pressing down on your shaft, translated through the synthetic material of your pocket pussy, tease you just perfectly. The way she moves her inexperienced wrists is almost frustrating -- she doesn't maintain an even rhythm at all -- but it still feels great on your member, and brings you some much-needed relief. The vacuumy sluicing of the lube over and across your dick fills the room with indecent sounds, mingling with the wet buzz of the wand on Rose's cunt.
Your toes are curling and your tongue is wagging, but you want to make this orgasm perfect... you want to feel like your dick is really buried in a pussy.
"Rose..." you murmur. "Rose, can you use your mouth on me too?"
This is accelerating to something entirely new. Playing with each other's genitals is one thing... sucking you off, another.
You nod at her. "It'll feel good," you tell her, swiping a strand of her hair behind her ear. "You can drink onii-chan's cock milk..."
She slinks to her knees before you. "If-- if it's for you... if it's for you, then okay... I'll do my best."
She clasps both hands around the silicone onahole, down at the root of your penis, and wraps her lips around the tip. Staring up at you, her doe eyes are adorable.
Like this, she begins to bob up and down. She said she's been peeking on what you do with the other girls... you can believe it. Or maybe hentai really has made her precocious. Either way, her blowjob technique is strangely excellent. Her tongue swirls in fast circles around the inside rim of the cocksleeve as she jerks the thing up and down on you. She herself, sitting under the desk, has her bare pussy against her vibrating toy, getting herself off while she sucks you. She's gonna get her nut at the same time you do.
If what you have with the other Rose is me-time, then maybe call this one us-time: it's a mutual dive into perversion, each of you assisting the other towards your cum.
You try hard not to blow your load too quickly. You want to savor the sensation of Rose's first-time fellatio. But as you click through the lurid scenes of the hentai game, and stare down at Rose using her lips as an extension of your onahole... it's all too much.
"Rose-- it's coming-- I'm gonna cum--!"
She nods enthusiastically. She never breaks eye contact, either. You pet her, running your hands in random circles around her pink tresses.
"I love you!" You snarl. "Drink my milk!"
She exhales hard through her nostrils and sucks down your spurting seed. The messy orgasm you have inside the onahole leaves Rose perfectly positioned to get every single drop. She scrapes her tongue searchingly all around even as you spew, licking it all up like the obedient sex kitten she is. And when she pulls her mouth free from your dick, lips bridged to it by a mixture of saliva and sperm, she smacks her tongue against her soft palate and says: "please fuck me, onii-chan... take my virginity, okay?"
So you fuck her. You bring her to her feet, turn her towards her bed -- throw her down onto it, and mount her.
"I..." she says, all of a sudden a little unsure as you loom over her. "I -- popped my cherry for you, but--"
"You what? How?"
"Hairbrush..." she says, looking away. "But... I'm still not that stretchy inside... so be careful, please."
You're as careful as can be, as you sink your aching, cummy dick into the soft embrace of Rose's mostly-unspoiled pussy. Just like when you deflowered in her in the last world, it takes no small amount of force to push your cock past the stubborn barrier of her clamping twat lips. She doesn't want to keep you out, but she clamps her muscles down by instinct, and makes it almost hurt to bust her open.
Her irises are dewy, and shimmer with adoration. Those partially parted lips and welling eyes are too much. They fill your heart with glad feelings. As your dick finally pushes through her resistance and robs her virginity, you press your face to hers, and kiss.
From either end, you enjoy your little sister's soft body. The walls of her vagina cling to you with the tenacity of bubblegum and her mouth sucks on your tongue with the same fervor she used on your prick. She's so in love with you... and she's so over the moon to finally have her beloved older brother rutting inside her. She might be a little dim, and more than a little cringey -- and lazy, and weird... but she's your sister, and because of that, you find cuteness even in her faults. And also because of that, your bodies fit almost perfectly together. There's nowhere else, right now, that you would rather deposit a load, than inside your imouto's baby pink cunt. You grunt hard directly into her mouth, hunching your body up as you begin to fuck her hard. Her body acts as a shock absorber, the flesh jiggling wildly and making a thwapping sound as you nail her. The violent, incestuous mating lasts only a few moments, because you're both about to really fucking cum -- really, really fucking cum -- harder than any of the previous times today. You unleash a 100% raw, unsafe creampie into your little sister's body, and she squirts all over you as she receives it.