Directing your gaze below her now open mouth and long, thick drooling tongue, a strand of saliva hangs enticingly before dripping down between the deep valley of her cleavage. A steady dribble trickles like a little shiny brook between two giant, smooth pink mountains. God, her tits were definitely never this huge. Tenting her tight black t-shirt outwards, your sister’s breasts are just about the most perfect pair you’ve ever seen. Smooth, pale and with a hint of aureole peeking out from the world’s hardest working piece of cloth, her nipples form two prominent bumps under the thin material. No bra, the slut.
Rose slaps your leg, hard.
“Hey! Quit it!” you yell.
“I’m still waiting for that drink, John.” she demands. Come on already, hand it the fuck over!”
At the same time, somebody grabs you by the wrist and before you know it, your right hand is guided onto a huge, pillowy soft expanse of tit flesh. Your head snaps around to see Marie grinning and pressing your hand deeper into the softness of her chest.
Yeah, okay. No contest. You fumble to hand over the last bottle of water as you instinctively start groping and squeezing your big sister’s tits.
“What the fuck, John?” Rose screams. “That was miiiine! Mooom, Marie stole my drink, it’s like a million degrees in here, make her give it back!”
“I swear to God if I hear another word out of any of you, I’m turning this car around and vacation is cancelled!” Clara yells back. “Marie, learn to share with your sister.”
“Mmmm, thanks, bro” Marie says before licking her big, fat juicy lips and wrapping them around the rim of the bottle. You’re not entirely sure she needed to pucker them quite so much, or push the head of the bottle a couple of inches inside mouth until her lips are stretched into a wide circle. And as she tilts her head back and starts to chug, you’re quite certain that sticking out her tongue and licking the underside of the bottle is all for show. Her messy drinking style results in quite a bit dribbling down her chin.
You watch transfixed as a rivulet of water trickles off her chin and pools in the deep crevice of her cleavage alongside the trickle of drool from earlier, before over spilling and dribbling between her pressed together breasts and… yeah, okay. She’s just being a cock tease now. The sound of her giggling has you reluctantly rip your gaze away from her perfect, insanely giant orbs in order to re-engage eye contact only to find her grinning at you. Her arms are tucked in, pushing her tits up in a makeshift arm-corset. She wiggles her arms, causing them to jiggle, her pale smooth flesh rippling with wet slaps against her chest.
“Sorry, sorry!” she laughs. “You’re too cute when you’re horny. Here, let me make it up to you. And thank you for the water, even if I spilled most of it.” She runs her hands over her now wet t-shirt. Both nipples stand erect in the cool, wet cloth and one has nip-slipped entirely out of her shirt. She wipes the rest of the water from her hands across her legs. “It’s much cooler now though. All’s well that ends well!”
“Let’s make sure you get a good ending too, hmm?” she says, reaching for your painfully erect cock.
“Oh. My. Fucking. God. Could you two just not be fucking pervs for ten fucking minutes?” Rose snaps, slapping at your arm.
“Oh, shut up you little prude,” Marie replies, handing your little sister the remains of the water. “Here, you can keep the rest if you keep your bratty little mouth shut.”
Rose grabs the bottle. “Just keep it down or I’m telling mom”, she says before turning to her window with a huff.
“I, on the other hand, will be keeping my mouth very, very open”, Marie winks, sticking to her word and making a wide O with her thick, moist dick cushions.
God. The Marie you remember was always sexually active, always had a man or two on a string but this was insane. Was she just a complete slut, or was this a siblings-with-benefits deal or what? You’re not going to complain, especially since her body, and tits, and those lips were just… thank any and every deity that you broke the universe, because it doesn’t get any better than this.
Your big sister unbuckles her seatbelt, stretching in what limited space the car allows for. The gallons of milky breast tissue forming a deep valley of cleavage bounce free from the constricting strap and settle on her chest with a captivating ripple of smooth skin. Definitely no bra.
She leans over and presses her thick thigh up against you as she lowers her head to your crotch. Mouth agape, she holds your shaft at the base – your sister’s hand is on your cock! Holy shit! – and you watch transfixed as the shaft slowly disappears between her lips. She doesn’t make contact, not yet. Instead she holds her face directly above your shaft, breathing on it. She alternates between soft exhales, drooling, and blowing gently and then, right before you can grab her head and start to thrust, she does the honours.
Lowering her mouth completely and wrapping her plush lips flush against the skin of your crotch, the head of your cock finally makes contact with her mouth as she tilts her head to look up and wink. A split second later, she sucks like a vaccuum, her cheeks drawing in as the full length of your cock is instantly engulfed in a warm, wet embrace.
As soon as every millimetre of your cock is in contact with the inside of her mouth, she takes no prisoners, immediately engaging every skill in her impressive blowjob arsenal to get you off. Her tongue frantically swirls around your shaft, she bobs so the head of your shaft tickles her gag reflex, using it to coat the inside of her mouth in thick, warm saliva.
Once you’re sufficiently lubricated in her gag-spit, she makes a lewd slurping noise as her lips slowly withdraw up the length of your shaft, her cheeks starting to bulge a little as she sucks up all the precum and sloppy throat juice. Grabbing and tilting your cock vertically, she hovers her head over it and slowly drools all over the tip, allowing the warm spit to dribble down and coat your shaft. With her other hand, she cups your balls, pooling the runoff spit and gently rubbing it all back in.
As your testicles are treated to a sisterly spit-bath, Marie starts covering your shaft with sloppy kisses. Her thick lips leave black lipstick marks all over the place. Once your cock is completely smothered in smeared makeup, she dips her now wet and smudged face down into your balls, slurping and blowing spit bubbles like a pig at a trough. Alternating between sucking on your balls and spitting the increasingly frothy puddle of throat-juice back onto your shaft, your goth-lite sister-slut never stops working your shaft with her hands. Not content with the typical jerk-off you’d give yourself whilst indulging in your depraved fantasies, she expertly twists her wrists in alternating directions whilst jackhammering at breath-taking speed. Her grip is loose to prevent you blowing too early – a problem which is increasingly relevant as you look down at your new incestuous sex toy half-drowning herself in your crotch.
Your cock twitches as her head dips lower, her tongue swirling around your balls before tickling your gooch and circling your anus. You’re not sure how to feel about that, but the sheer nastiness on display in the backseat of your family car has you near to tipping point. You start to buck your hips involuntarily, desperate to reach climax at the hands of your talented sibling.
Marie, however, has other plans. Backing off before you can blow your load, her messy face emerges from under you.
“Not yet, buddy. Here, distract yourself with these” she smirks, grabbing your wrists and pulling them to her chest.
She guides your hands to her breasts and lets go. It takes you a second to realise you’ve been given permission to grope your big sister’s tits, but before long your fingers flex and sink into the thin cloth of her top. Even through the material, she’s so soft. You readjust your hands to cup her breasts from below, hefting them up to feel the weight. You have to exert some effort, these puppies are fucking heavy. Sagging around your hands, you bounce the sacks of tit-flesh up and down, relishing in their weight and size. The skin ripples as you jiggle them, wet and glistening from the spit polish she gave them earlier.
Before you can continue, Marie gives you a look that’s partway between slyness and confusion.
“You can get that thing out the way, you know?” she says, before grabbing your wrists again.
Annoyed at having your boob playtime interrupted, you’re about to object – but then your hands are making skin contact with her breasts as she slides them under her top. Shimmying the straps off her shoulders, she slides your palms down and under her clothes until your hands are covering her nipples. Thick, puffy and hard as diamonds, you can feel them digging into your skin.
“There you go! Enjoy!” Marie says with a grin, removing her hands from your wrists and leaving you groping her tits and covering her nipples like a makeshift bikini.
And grope them you do. Your fingers sink deep into soft, pale flesh, eliciting a soft moan from its owner. You rub your palms across her nipples, enjoying how hard they are. The fucking slut is loving this. You rub one of them gently between your fingers, and Marie grips your cock and pumps you a little harder.
“Oh fuck yeah, just like that,” she moans.
You oblige, twisting and tugging lightly on both her nipples as she starts to pump your shaft in earnest, fast and hard.
“Uhhh, yeah. It’s okay, you can tug on them. I’m a big girl, I wont break!” Marie giggles. “I like it a little rough.”
Your cock twitches at that, but you hesitate – it’s one thing to be told to molest your sister whilst knowing you’re in a fantasy timeline without consequence, and quite another to actually do it. You’ve never been rough with a woman before, but if that’s what she wants, then…
“Mmmmm!!!!!” Marie yelps as you grab both nipples and roughly twist them both. Pulling them towards you, you pull her stupendous, pendulous breasts up and out, their full and considerable weight hanging from the twisted nubs pinched between your digits. Letting go, they fall back to her chest with a wet SLAP!
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