Mistaken Identity

Cindy pounced on the figure as it shut the door, essentially ripping its trousers off and shucking its boxers down in a matter of milli-seconds. She took its cock in her hands and shoved it greedily into her mouth, feeling it harden inside with great satisfaction. Her head bobbed wildly back and forth, Cindy wanted this to be the blowjob of a lifetime, or at least the blowjob of the year, and to that end twisted her tongue furiously around the head, along with the shaft. Once or twice, she even dared stick the tip of it up the owner's urethra, making it writhe and corkscrew there at the entrance (or, rather, exit) to the proud penis she was currently sucking on. It felt a little different to what she'd come to expect from Bradley, but then again he had been sucked and fucked to hell and back today...most likely, she thought, he was just tired.

She continued unabated, slurping at it more and more desperately as the minutes passed, while up top he groaned madly, his left hand eventually coming down to rest on top of her head and push her further into him, while the right fondled one of her tits. Cindy obliged, letting his cock tickle the back of her throat and trying not to gag in the process. This was out of this world! One of the best-tasting dicks she'd ever found herself in a position to suck, and it was all hers! She went on happily as ten, fifteen, twenty minutes passed...and then the countdown to cumming began. Cindy worked his head with reckless abandon, his cries of bliss becoming louder and louder as the big moment approached. Suddenly, five seconds before the end, he spoke, "Daisy...if that's you? I take it all back, you're fucking amazing."

Cindy frowned, looking up and squinting to try and get a look at Bradley's face in the gloom. Why did he think she was Daisy? And come to think of it, now that he was speaking less quietly, why did he sound...different? "Lemme see you," he said. "I wanna see that beautiful red hair, and that face...fuck, that face!" She heard his hand scraping against the wall, and then the dull slapping of skin on plastic, and then, in the last two seconds before he achieved liftoff, the light came on.

Cindy looked up, and Bradley looked down. Except...it wasn't Bradley. Cindy's eyes bulged as she found herself staring into the face of her brother, and Justin looked like he'd seen a ghost, as his expression of contentment and lust fell away to be replaced by one of shock—understandable, given the fact that his sister was kneeling naked in front of him with his cock in her mouth. He looked down at his own trembling hands, the black locks of Cindy's hair were between his fingers, and in his other hand the soft flesh of Cindy's boob was there beneath his palm, these fingers splayed across the wide space of her E-Cup, the ring finger resting tartly on her nipple. Justin gulped, taking in the horrendous sight of his little sister deepthroating him with her great, big tits on display, one of which he was currently groping. He knew he shouldn't be seeing this, he knew that none of this should even be happening...but he couldn't help his gaze travelling downwards, past her chest and to the dark, sparse patch of pubic hair jutting rudely out from between her folded up knees. Both of them froze, and that was enough to seal both of their fates. Justin was too late to even contemplate pulling out, and Cindy was similarly so stunned she couldn't think straight. Justin's dick was so very big, and so very long...

Their stunned horror allowed Justin's orgasm to roll on, and right before he came, he gave Cindy a pleading look, and choked out an apology, "Lil' Sis..." That was all he could manage, as right then, a thick load of hot cum shot up through his urethra and blasted out into Cindy's mouth. She blinked, then blinked again, pupils dilating fully. Her brother's semen was heavy on her tongue, and the salty taste was unmistakable...but she couldn't quite compute that what was happening was, in fact, happening. The reality of it came to her in fragments; she allowed his cock to slide out of her mouth, her cheeks ballooned to comical proportions by the size of Justin's load, a small bit of it dripping out from between her lips and slowly running down her chin. Justin had cum in her mouth, she'd jumped on Justin and started sucking his dick in his own bedroom, while Bradley was downstairs! She couldn't swallow, but then...where the fuck could she spit it out?!

His cock was already softening, and he was gesturing at her futilely, trying to communicate how sorry he was in the absence of words. Cindy let out a muffled scream, trying to communicate how badly she needed his cum out of her mouth. She got up as quickly as she could, holding her hands under her chin to catch any stray bits of semen now falling down under it. Justin flinched as her breasts brushed against him. He stole a glance down at her and immediately saw it was a mistake; her nipples were pink, why were they so damn pink? They made him think thoughts—bad ones—the kind you didn't ever think about your sister. He reminded himself that they were Cindy's nipples, trying to keep his dick as flaccid as possible. Cindy's nipples. Cindy's big, pink nipples. Cindy's big, pink nipples on Cindy's equally big tits. Justin closed his eyes, screwing up his mouth and trying to remove the image of his little sister's big, pink nipples from his memory. But then the questions started coming to him, the intrusive thoughts. How could her nipples be so big and so pink when she was supposed to be his little sister? When had this happened? Why hadn't he noticed, but then on the other hand why would he?

Cindy meanwhile was looking around frantically for a way to dispose of the cum filling her mouth. Justin's semen was now dribbling down over her chest, despite her best efforts, pooling around her titties, bits of it catching on her nipples. She turned and spotted a waste-paper basket under a small desk, and hurried over to it. Justin heard her footsteps and the subsequent clattering of the bin as she grabbed it and bent over to spit into it. His guilt at what he'd done was eating away at him, so he opened his eyes and went to ask if she needed any help, but the words died in his throat when he beheld his sister's heart-shaped arse. Cindy leaned over the rim of the bin, hocking a great glob of cum out into the bottom, and continuing to spit out whatever remained for several seconds afterwards. As she was bent over, Justin had a view of everything, and with a great outpouring of shame, he pressed his hands tight over his hardening cock. That was his sister's heart-shaped arse, and now he had the image of it and her pussy lips burned into his brain along with that of her big, pink nipples. Why did she have to be naked? Why did she have to have nipples that were so very big, and so very pink? He couldn't stop himself from recalling how her nipple had felt in his hand, and with a shiver of revulsion, he felt his cock stiffen once more, if only the smallest bit.