And how!

You looked at Bonnie’s scantly clad body, the way her tits threatened to burst out of her shirt, the way the thong disappeared into her ass. You were so aroused that your body physically ached with desire.

“C’mon,” you breathed, leading her down into one of the darker aisles. “We’ve got to be quick…”

Bonnie giggled with excitement, dumping her items and leaning over one of the shelves and sticking her ass out proudly. Your heart began to beat so furiously it threatened to bounce up, out of your throat as you took in the sight of her glorious ass.

Reaching behind her, Bonnie parted the thong to the side and spread the beautiful pale globes of her ass to reveal her dripping cunt. You also took note of her tiny, puckered asshole and for what felt like an eternity you could think of nothing else but jamming your dick as far up there as it would go.

But, of course, even as clouded by lust as you were, you knew it would take more than a quickie to properly enjoy that bout of sodomy. Instead you undid your pants and took up your throbbing cock, absently noting that it had grown slightly in girth as you began to line it up with Bonnie’s pussy.

You sank in all at once, bitting down hard on your lip to stop the deep groan of joy you felt when fully sheathed. Her velvety walls felt like a furnace around your dick, the muscular flesh of her ass so wonderful against your groin and thighs.

Bonnie was breathing heavily as she turned to look at you. A delirious insane smile on her face as she rhythmically clenched herself around you.

“C’mon,” she groaned, “get to work little brother!”

You didn’t need to be told twice, pulling back slowly before slamming in with a burst of aggression. You repeated the process, pulling out and then slamming back in, again and again working as much of yourself inside the squirming, clenching body of your sister as you could.

“Aaahhahahafuck,” she gasped, laughing like a drunkard as her body was thrust forward over and over. “How..ahh…how the fuck did I go so long without a taste of this good dick!?”

Your hands gripped her hips hard enough to bruise, but neither of you seemed to care. “ Like that sis? Like how a man fucks you?”

“Ohhhshityes,” she hissed in a blissed out voice, “C’mon little bro, fuck my lesbian cunt, fuck it until I can’t walk!”

The sound of flesh slapping flesh grew louder as you picked up the pace. Her whole body shook with the impact of your thrusts, items cascading from the shelves around her as she held on for dear life.

“THATS IT” she growled, “right THERE!”

Looking over her shoulder at you Bonnie reached out suddenly and pulled you forward into a deep kiss, trying to consume you with her mouth simultaneously with her cunt. When you broke away she still held your face close to hers, the delirious look in her eyes worse than ever.

“I love you so fucking much bro,” she breathed, face flushed red with effort, “the only man…ahhhh I’ll ever …fuuuuuaaarrgh!”

The genuine passion in her voice, the way her sweaty, sexy body looked as you rammed into her, the feel of her body squeezing you...it was too much. Your hips worked overtime spearing into her again and again until suddenly your dick was caught her the tight vice of her orgasm, which in turn wrung out your own as you emptied inside of her.

It took every ounce of your remaining strength not to collapse against her, instead you opted to stumble backwards and leave a trail of cum oozing down her legs. Your heart was pounding and for a moment you had a touch of vertigo, having to lean against a shelf for support.

In that daze of post-orgasmic bliss you found yourself staring as cum slowly drooled out of Bonnie’s pussy. It suddenly occurred to you for perhaps the first time the reality of the situation. Your sister was sane(ish) and it was because she was currently carrying your child inside of her.

She had adjusted her thong back into place, preserving what shred of modesty she could and was about to say something when you suddenly drew her into a hug.

“Oh!” She squeaked in momentary surprise, but settled into your arms with a little laugh. “When did you become such a cuddle bug?” Her playful smile faded into concern when she saw the expression on your face, “...seriously, are you ok?”

“Yeah, I just...” you felt a swell of emotion, “I love you sis, you know? Even without everything else that’s happened. And I promise I’ll always take care of you.”

Bonnie looked into your eyes searchingly before melting into your hug and pressing her head against your chest. The two of you remained together like, luxuriating in each other’s presence until a sudden crash from the other end of the aisle caused you both to snap to attention.

Exchanging glances, the two of you slowly crept in the direction of the sound. It was sporadic, but unmissable as you moved through the maze of the store. You glanced around the corner of the aisle and froze.

Three tall men were looking through one of the shelves, muttering to each other in an foreign language you didn’t understand but could recognise from the other day at the garage. Your breathing picked up and panic began to grip your heart when you saw that one of them was gripping a very long, bloodied Katana...