Our protagonist enjoys his little step-sister's throat. She's not so keen.
Squeezed in on both sides by a hot, sweaty flagrant display of nubile, half-naked teenage flesh, it’s difficult to focus on which of your lovely siblings are most deserving of refreshment. You use the word lovely in the purely physical sense, because whilst you've always gotten along with Marie in the typical sibling ‘looking out for but riffing on each other’ way, your relationship with Rose was rocky at best. That’s entirely her fault of course, she just turned into a grade-A bitch since she hit puberty. She didn't used to be all that bad though - as you recall, the two of you used to get along well enough as kids until pretty much overnight, she became distant and annoying. Hormones, am I right?
Although... if you were a little more honest, she might have noticed you perving on her perky little tits and barely legal, tight little teen ass once or twice. Maybe a few times. Okay, okay! …Maybe literally every time she was in the room. You were discreet, of course (Clara would beat the shit out of you if she found out you were letching on her little angel) but come on! It was obviously her fault for wearing either nipple-pokies and cameltoe tight, skimpy slutwear or cleavage revealing loose pyjamas around the house all the time. When you can see the bottom of a pair of perfect, tight as fuck ass cheeks right there on display or braless nipple bumps under a tiny pink crop top, what else is a guy gonna do but sneak a peek? Creepy misogyny and incestuous undertones be damned, when a sex starved body full of horny hormones has barely legal tits and ass shoved in its face every day, a guy is gonna stare. That’s just biology, man.
So, what used to be innocent tickle fights and lounging around playing comfy video games together quickly became rolled eyes and insults - then sneers and texting on her mobile behind doors slammed closed. Ironically, the widening emotional distance between the two of you actually degraded any empathy you had for your formerly cute little sister and made it easier to sexually objectify the little brat. By the time you’d rejected the world and begun working on an escape route to a fairer world where your cock could express itself, any familial restraint had been completely eroded to dust and replaced by pure sexual frustration and undue resentment.
What had begun as the occasional guilty, late night spank session whilst browsing her social media bikini pics on your phone followed by immediate post-nut guilt and self-loathing had progressed to a conscious decision to listen at your door for the sounds of the bathroom door opening so you could sneak harmless photos of her half-naked wet teen body walking down the hallway, fresh out the shower and wrapped in a damp towel whilst pretending to text. Eventually, the relentless injustice of being the stereotypical basement dwelling loser with a weak moral compass surrounded by hot unattainable women pushed your wank sessions to a new extreme. Shortly before the Entity graced you with the promise of limitless deviancy, you had become comfortable with fantasising about fully dominating your little sister against her will, slapping her perfect little butt, twisting her cute little nipples, pushing her up against the wall and exploring her mouth with your tongue - and then grabbing her by the throat, pinning her down and putting her in her place by fucking the ever loving shit out of her. Usually whilst jackhammering your lubed up cock with a tight grip that you imagined was her broken in cervix, imagining her screams of pain turning into moans and incomprehensible babbling and drooling as you force orgasm after involuntary orgasm out of her tiny body as you rearrange her feminine organs with your frustrated cock.
Yeah, you were just the best brother alright. Whatever, it was always just an idle dark fantasy, nothing you had ever entertained the idea of actually doing. I mean come on, you weren’t an actual psychopath incapable of distinguishing reality from fiction. As much as she might piss you off, Rosaline was still your little sister, and you really did love her, even if her teen bitch phase made it difficult to remember that sometimes. You simply enjoyed enhancing your jerk off sessions by harmlessly fantasising about forcibly stretching out her womb with your massive cock on occasion, that’s all.
Except… you were in a different timeline now. And the girl sitting to your left wasn’t Rose, was she? Not really. The real Rosaline was back at home in her room and wouldn’t remember any of this. Hell, none of this would really happen, not really. The Entity said as much, this was just for data collection. Just one possible unlikely timeline. The whole universe is offering everything and anything you want with zero consequences. The girl to your left might be a real person, a real version of Rose, but one without a future if this timeline never happens. So anything you do to her is fine, right? And if the universe saw fit to trap you between skimpily clad, porno versions of your sisters in a hot, sweaty car, with tits and legs on display, and a raging hard on that apparently only one of them had noticed, then what’s a guy to do but accommodate it? It's not like you have a choice anyway... right? If you don't act, you'll only have to at some other point in time. It's out of your hands.
You look your little sister up and down, openly perving on her exposed skin. Whilst her tits are on the small side, your eyes are drawn to her slender, cute tummy with a hint of toned abs, currently glistening in droplets of sweat. God, you could probably fit both hands around her waist if she sucked it in. It would be so easy to manhandle her.
She gives you the stink eye and mutters something about a fucking pervert under her breath before huffing and leaning in, yanking the water bottle out of your hand and jerking it away. She scoots over on her seat as far away as the cramped space will allow and smirks at you. You hadn't even decided which of your sisters you wanted to be nice to yet!
"Fucking loser. Think with your brain instead of your dick next time." She uncaps the water and starts to chug. Before you can react, Marie speaks up on your behalf.
"All you've done for the past two hours is bitch and whine and moan! David was kind enough to share the last bottle out of the goodness of his heart, but noooo. You just had to be a greedy little bitch like always, didn't you? You know what? Fuck you."
Marie unbuckles her seat belt and leans over you, crushing her pendulous tits against you in the process. She grabs the water bottle and squeezes it hard, forcing water down Rose's windpipe and all over her top. Her nipples poke little bumps in the wet cloth as the jolt of cold water seeping into her top and bikini freezes them. Rose starts hacking and coughing, spluttering droplets all over the place as she coughs up the forcefully inhaled water.
Her eyes watering, she looks over at Marie with hurt indignation on her face. Coughing into one hand, she frowns and slaps at the both of you. The sudden movement locks her seat belt, and she huffs as more air is forced out of her lungs. Her attempts at smacking the two of you thwarted, she lashes out with her legs. You grab her by the ankle as she attempts a kick to your groin and can't help but laugh at how feeble her attempts are. Come to think of it, didn't the Entity say something about you being unable to come to harm? You could just let your little sister have her tantrum without fear, but then again...
With your hand grasping her firmly by the ankle, you do have a clear view up her smooth, slender legs to her panties. Beyond even attempting to pretend not to stare, you wait for her to lash out with the other foot before grabbing that, too. Lifting her legs up, you pull them across your lap as she continues to struggle to unlock her belt. The latch is twisted up and pinned underneath her.
Keeping hold of one leg, you run your hand up her calf to the underside of her knee. Moving past the softest skin on earth, you lick your lips as you slide your hand up and grope her thigh.
"Holy shit, dude", Marie says. "You're my kind of freak!"
You feel your big sis's giant tits pressing against your back as she reaches around you to grab Rose's legs and help hold her in place.
"I've had about enough of this little brat, you finally gonna teach her a lesson? Great. Let me help." Her breath tickles your ear as she whispers conspiratorially. "We're gonna need to keep her quiet though, Clara's an oblivious cunt at the best of time, but even she'd notice her precious little angel screaming the house down."
Marie lowers the little plastic sunscreen on her side of the window, and you quickly follow her lead and do the same on Rose's. With the front passenger seat filled with camping gear, the only way somebody could see in is through the back or front windscreens, though you plan for all the action to be below head height so the only thing to worry about is your step-mom looking into the back seat. Not that you're particularly worried. If you get caught, it's some other version of you who'll have to deal with it.
Marie reaches under her step-sister and fidgets for a second as she unfastens the buckle acting as a makeshift harness, before grabbing her by one of her twin-tails and yanking her across your lap. Before Rose can yell, she finds the palm of her elder step-siblings hand firmly clasped over her mouth.
"Keep quiet, you little bitch. This is payback for all the time's we've had to put up with you," Marie hisses. "Keep quiet, or you'll just make it worse on yourse- AH! Fucking cunt just bit me!"
Marie jerks her hand away, sucking on the red semi-circle of bite marks around her thumb. You're about to replace her hand with your own, comfortable that Rose will be unable to repeat the trick, but Marie acts first.
"Right. That's it. I've had enough. You want to be a little bitch? You want something to drink? Want to bite me? I'll GIVE you something alright! Choke on this, you little rat!"
Marie grabs Rose by the back of her head and twists her fist into her hair, yanking her head up at an uncomfortable looking angle. You stare on, your erection rubbing against the struggling girl's tummy as your sibling-in-crime hovers above the poor girl's head. With her neck craned back 90 degrees, Marie spits into Rose's mouth and grabbing her wrist, shoves her fingers back inside her step-sister's open maw. She leans in close, inches away from her face.
"Go ahead, bite me again. I fucking dare you. See what happens. I want you to do it. Give me the excuse. Fucking do it."
Rose just sobs, still writhing on your lap and failing miserably to fight off either of you. God, she's so weak. So fuckable.
"No? Didn't think so," Marie sneers, shoving her fingers deeper into Rose's mouth. You watch her throat pulsate as she gags on the intrusion.
She smiles and winks at you before whispering in your ear. "Enjoy your reward. You earned it, and the little slut deserves what's coming." Rose tries desperately to shake her head and mutter her objections through a mouthful of digits and drool, but Marie ignores her and gives you a big wet kiss on the side of your cheek. The last thing you see before focusing on the imminent blowjob is Rose's helpless, drooling and tear streaked little face looking up at you in a silent plea for help before being lowered down onto your throbbing erection.
Rose is no match for her elder sibling. Marie is stronger than she looks, and utterly determined to remain in control here. You've never seen this side of your sister before, and you don't know whether to be scared or aroused. Scaroused? Was that a word?
Either way, you keep your hands to yourself and one eye on the ever present risk of the driver - whilst you technically have nothing to fear from your step-mom discovering the utter debauchery being committed in the back seat of her car, the last thing you want right now is for the experience to end after only a few seconds. The greatest threat right now is a premature end to the scenario. Whether by luck or fate however, Clara remains utterly oblivious as Marie pushes Rose's head inch by inch towards your dripping, throbbing erection. Rose groans, attempting to twist her head sideways at the last second. Your cock head bounces off her cheek.
"This is happening. Deal with it you little fucking brat," Marie spits venomously at her little sister. "Get. On. That. Cock."
She twists Rose's face back towards you and pushes it down. Rose grabs the seat on either side of your legs and attempts to push back and for a tantalising second, the siblings are at equilibrium as Rose's lips hover over your shaft. A small bead of saliva slowly trickles down over her bottom lip and hangs in the air until it makes contact with your cock. You twitch in anticipation. Oh, god. Your cock was going to be inside your little sister's mouth. This was really happening.
Finally, quivering in exertion, Rose's slender arms can hold her back no more. Straining to the last, they cannot protect her innocence forever. Her stamina drained, they give out and her head is slammed at full force onto your shaft. Your groans of pleasure are met with harsh, guttural sounds of discomfort as the head of your cock slides across your little sister's tongue, up against the roof of her mouth and finally comes to a braking halt as it slams up against the entrance to her throat.
"No no 'leeease s'op Mhh! N-mmmmmnnn! GAAACKKKKKHHHH!"
With zero regard for Rose's wellbeing, any fears you had about a less than satisfactory blowjob are cast to the wind as Marie flexes her biceps and pushes down hard on Rose's skull, grinding her tonsils onto your cock.
Okay, this timeline's Clara must be either half-deaf or oblivious to the extreme, because there is no way in hell anyone could miss the horrendous noises now coming from your new oral fuck-toy. Rose sounds like she's attempting to regurgitate a gallon of jelly, and your crotch is immediately bathed in a thick syrup of clear gag-spit. Your cock and balls are soaked in a soft, warm coating of feminine oral lubrication.
"Yeah that's it, you little slut. Gag on that cock. Lube up that mouth-pussy, nice and wet." Marie laughs.
"Fuck, Marie," you whisper. "I want to teach her a lesson too, but maybe ease up on the girl a little?"
Marie frowns. "Why?" she asks, confused. "I mean, if you really want me to, sure. But-"
Rose's head is extracted from your shaft, the poor girl coughing and moving to wipe her chin. No sooner have her lips left the tip of your cock before they're slammed back down, full force. And this time they don't stop when your bell-end starts knocking at the front door to her throat.
"Do you really want me to?"
Rose's lips slam into your pubes with considerable force as she is brutally skewered on your dick. Embedded deep in her tight teen throat, any objections you had disappear in an instant. You look down at your spread legs and the little blonde head occupying the space your cock would usually be. Your little sister's head.
"Uhhh... oh fuck..." you mutter.
"Yeah. Didn't think so." Marie grins. She leans in and gives you another wet kiss, this time right on the lips. Her tongue slips inside your mouth and you find yourself returning the gesture. Alternating between sucking on her thick black lips and exploring the inside of her mouth with your tongue, the waxiness of her black lipstick coats your lips and teeth.
Meanwhile, she's easily holding Rose's head in place as her throat spasms milk your cock. You feel ripples up and down your shaft as she gags, then a wet explosion of fluid splatter across your belly as she exhales a mouthful of spit and pre-cum from both nostrils.
Her head is permitted to withdraw from your crotch long enough to allow her to suck in a half-breath before prematurely being pushed back down. You moan in pleasure, breaking your deep kiss and breathing heavily, face still pressed up against your big sister's pretty - and now somewhat smeared - face. Marie responds by moving your hand to her breasts, encouraging you to push it deep into the soft tissue as she uses her own hands to manhandle your makeshift sex-toy.
Pulling and pushing with increased speed, your cock pops out of Rose's throat with a wet shluuuurkkkk before being pushed against the inside of her cheek. Twisting her head back and forth, her cheeks bulge obscenely as she's forced to pleasure her brother. After thoroughly coating the inside of her mouth with her own gag-spit, you're finally treated to the main course.
The blonde teen's head is yanked back by her twin tails before being slammed back onto your cock, but this time, she's given no reprieve. No sooner has she finished retching, Marie pulls her back and drives her in deep again.
Slowly building up speed to a frantic pace, Rose has her pretty little head violently skull fucked on your cock for the next several minutes straight. Taking quick breaths when she can, her pleas for mercy soon give way to coughs and gasps as the ordeal she's enduring drains her energy. Finally, she stops taking breaths, instead only able to cough reflexively. Marie doesn't let up the pace, dredging her throat with your cock with savage relentlessness. As the last of the air is expelled from the girl's lungs, Rose resorts to slapping at your thighs.
Marie does not relent. The slapping gets more frantic, but it's not until she starts to turn a deep red and twitch that Marie permits her a chance to breathe.
Yanking her head back by the hair to an uncomfortable looking angle, Rose horks up a giant wad of plegm and cock-spit into the air, which rains down in splatters on her now destroyed face. She takes one ragged breath before coughing horrifically.
"Rose, are you causing a fuss again? Be quiet back there please, or I'll confiscate your phone for the rest of the trip." Clara admonishes her but has yet to turn around, distracted by the length of the traffic jam and currently exchanging some unsavoury finger gestures at the driver in front.
"You heard mom," Marie whispers. "Back to work, slut."
Rose's eyes are lidded and her mouth sags, all the fight gone from her as she's pushed back down onto your shaft. Marie pushes down on the top of her head hard, fully hilting you balls deep in her throat. She grips her on either side of her skull and jerks you off with her face in small, quick and forceful pushes like she's giving CPR, milking your cock in your tight, teen little sister's throat. As you're milked by her rhythmic throat spasms, a watery mix of pre-cum, snot and water dribble from her loose lips and her flared nostrils. Her half-lidded eyes are leaking a constant trickle of tears and look bloodshot from the strain. She looks utterly defeated.
"Uuuhh, gonna cum soon!" you moan.
Marie smiles. "Hear that, you cunt? You wanted a drink, so fucking drink up! Drink your brother's fucking load!" Rose's eyes squeeze shut and fresh tears coat her cheeks as you pump strand after strand of thick baby batter directly into your baby sister's stomach.
“That’s right, chug it you little fucking whore. Chug that thick fucking jizz. Take it all!”
Marie pushes down firmly on Rose’s head, forcing her flush against your crotch until her nose is crushed into your pubes. Rose spasms and snorts. Two strings of thick nut juice spew from her nostrils into your crotch where it pools around her face. Marie giggles softly as Rose squirms and vainly tries to free herself. Cum bubbles froth and foam around the base of your cock as the last of the air is pushed from her lungs into the puddle of slop. Her mouth opens wide as she tries to pull in fresh air, only to suck in a mouthful of testicle sweat, spittle and cum.
Her hands are slapping your legs again now, her movements frantic and panicked but much weaker than before. Marie loosens the pressure on her head enough to allow her to grab the car seat and push herself halfway off your shaft before suddenly and violently slamming her head back down with force. Rose's tear streaked face makes a wet splat as it impacts your crotch. Cum and throat slime splatters across her entire face, soaks her hair and even covers her panicked bloodshot eyes as she bucks wildly, kicking and slapping at anything in reach. For your part, you groan and also kick out wildly, on the extreme opposite of the pleasure spectrum to your poor abused little sister. The post-nut sensitivity combined with an unexpected thrust deep inside a tight sloppy throat forces a second, uncomfortably intense ejaculation out of you. This one is dumped directly down your sibling’s throat with little fanfare - she has no more breath or strength left to expel it.
Marie finally lets go, and Rose immediately jerks back her head with force, taking a deep, wet ragged breath - slamming her head against the back of the driver’s seat with a loud crack.
“What the fuck is going on back there?” Clara yells as Rose winces and rubs her head whilst coughing up an ungodly river of her brother's nut juice all over the back seat floorboard.
“It was Rose!” you and Marie say in unison, before looking at each other and sharing a smirk. Clara glances over at Rose's empty seat on your left and for a moment you worry that she'll notice that you're naked from the waist down and drenched in Rose's gag spit.
“Stop fucking around and get back in your seat Rose, or I swear to god you’re grounded for a week!” says your step-mom, wonderfully oblivious to the deep, violent incestuous throat dredging her daughter just received less than a foot away.
You hear a gentle tinkling, like wind chimes. Blinking away the weird symbols flickering over the surface of the front car seats like holographic stickers, the world around you slowly fades away. You turn to look at Marie, but she's already cast in shadow and alien runes. You raise your hands only to find you have none. The noise of the traffic dims until you find yourself standing back in the corridor where endless doors await you.
---
For an alternative timeline where Marie gets her thicc lips on that cock, see Ch.2A.
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