Big Bro, Little Sis

Cindy's spitting gave way to retching. After an extended period where she tried her damndest to get every last drop of her brother's cum out of her mouth, she finished with a great, spluttering cough, then turned and sat down with her back to the basket. She looked up at him, exhausted. Justin's eyes were locked onto her nipples—he couldn't help it, he really couldn't. He felt he should do something to help, walking awkwardly over to her with his hands over his cock, trying to push his boner down and out of sight. She looked apprehensively up at him as he approached, pupils dilating when she saw the level of rigidity and girth he was attempting to conceal. "W-what are you—" she stuttered, scrambling up onto her feet. The basket clattered onto its side behind her, and Justin tried to reassure her, "N-no! Cindy, I didn't mean—" he brought one of his hands up to signal his peaceful intentions, but the sole remaining one proved not to be enough to keep his prick in check, and it sprang up out of his palm, bouncing up and down in front of his horrified sister.

Cindy shrieked, stepping back to get away from him, boobs bouncing as if in tandem with his cock. Those lovely pink nipples were threatening to hypnotise him all over again, preventing her big brother from properly gathering his thoughts; Justin was groaning inarticulately, trying to apologise even as his erect member appeared to flaunt itself before her. He went to put his hands on her shoulders, trying desperately to get her to calm down, but she was flailing beneath his grip, and wouldn't stop moving back. The basket got tangled up under her feet, and her eyes went wide as she felt them going out from under her. Cindy slipped and fell, Justin dragged down with her. Landing hard on the floor, Cindy was winded, breasts jiggling wildly from the impact. Justin followed, falling down onto Cindy. His hands were out beneath him to break his fall, and quite by accident where he landed on top of her they each perfectly secured themselves around one of Cindy's tits. She yelped at his touch, unable to truly believe her brother had just fallen on top of her whilst wearing not even the slightest bit of clothing.

"I...uh....I...Cindy, I..." he was barely able to articulate himself, the awful taboo of the situation was making the air thick with tension, and the terrified, confused series of emotions running through him weren't helped by how gorgeous her body was. Cindy's tits were soft and pliable beneath his fingers, he could see snatches of the rosy pink colour her areolas boasted through the gaps in them, and the hard points of her nipples jutting up and into his palms. Beneath him, his younger sister was breathless, an expression of palpable discomfort on her face. The dark-coloured hair they both possessed was fanned out on the carpet surrounding her head; he was painfully aware of the fact that his knee was pushing against her naked sex, the slit giving way slightly, the lips having folded inwards when he'd made contact with her. Justin's cock meanwhile was straining against her milky white thigh, the skin around the impact site pressing inwards, little stretch marks visible in the area around it. The thighs in question were thick, and sumptuous, the kind of thighs that just about rubbed together when she walked.

"Why...why..." she was whispering, eyes tainted with fear. Justin wasn't getting all of it, but when he went to move his knee out of her crotch, his stomach lurched as he realised what had happened. His knee came away sticky, and moist. "Why...why am I w-wet?" Cindy's mouth was open, and she was staring up at the ceiling, as if trying desperately to look past her brother. Justin felt another wave of guilt come over him, and he went to extricate himself from his nude sibling. Justin released Cindy's tits, a twinge of longing going through him the instant he felt his palms receding away from their intoxicating warmth and cushiony texture. Despite his conscious attempts to get up and away from his stark naked sister, his cock, it turned out, was still ready and eager for business. As he pulled himself up and away from her, he cringed, watching a long, gooey strand of pre-cum spool out from the spot on her thigh where his member had landed, continuing to link brother and sister like a gossamer-thin bit of web. "Aw, jesus..." Justin remarked, trying to break the strand with his fingers. There they were, Justin and Cindy, naked as the days they were born and marked by each other's juices. Neither of them could sort through what to even say to one another, let alone what to do to salvage the terrible situation in which they'd found themselves.

They both looked down at the places where they'd left sticky mementos on each other, and panic flared up between them. I have to fix this, they both thought. I have to get rid of that now! What will they think of me? What kind of sibling am I, to get wet from seeing them like...like this?! Cindy struggled to her feet, heedless to the intense wobbling of her bum, breasts and thighs, anxious to get that snail trail off his knee. At the same time, Justin tried to go over to her, hoping to redeem himself by cleaning the pre-cum off of his little sister's thigh—a horrifying objective for anyone to ever contemplate, let alone need to actually accomplish. They met each other in the middle, his hand rubbing at her thigh and hers at his knee, both trying not to let their eyes wander onto anything else, and yet...

Cindy gaze slid over to his fairly respectably-sized cock, its head was a deep pink, the shaft closer to a healthy cream colour. His balls were medium-sized, hanging a short distance down from the rest of it, festooned with coarse black hairs. It was, objectively, a nice cock. Not too dissimilar to Bradley's, save perhaps for the colouring. She told herself off silently, tearing her eyes away with some difficulty to focus back on his knee.

Justin was resisting every instinct he possessed to avoid looking at the pussy in his peripheral vision. It was a difficult ask. Despite everything, the fact remained that a naked girl's crotch was inches away from his face, and his body was very much aware of that fact. He felt his dick coming back for round two, rising further and further up toward Cindy. If she was seeing it, she was doing him a favour by pretending not to notice. Justin tried to keep his attention on the viscous patch of pre-cum stuck to her thigh, battling valiantly to keep it contained, but within seconds it had migrated acros his fingers, and his palms were sticky to the touch. He held them up to avoid dirtying anything else, and looked down when he heard Cindy gasp. She was staring, transfixed, at his cock, which by now had risen to obscure her view of his knee. Here, his animal brain saw its opportunity, and he stared recklessly at his little sister's pretty pink pussy. The lips were flushed—a gentle, rose-coloured tinge visible all around the edge of her slit, while the slit itself was bordered by a slight, glistening trail of the sticky treat she'd left on his knee. The whole picture was contrasted with and intensified by the dark hair located just above it, beneath which the skin paled significantly.

She looked up at him, appearing at once both distressed and awkward. Cindy had been seen naked before, many times, but this wasn't any of the boys at school or college, this was her brother; the boy who used to pick her up and give her piggy-back rides, the boy who used to blow raspberries into her stomach and play hide-and-seek wifh her. There was something deeply, skin-crawlingly indecent about this, about him seeing her boobs and her pussy, about him having touched her like that—even if by accident—it skewed all the fond memories they shared, making their relationship more and more into a seedy, perverted thing the longer his eyes stayed on her crotch, on the space between her legs...

Instinctively, Cindy wrapped her arm around her breasts and, with the other bunched into a fist, covered the small patch of hair and the enticing slit beneath it while looking away, embarrassed. "D-don't look. Don't look at me!" She insisted, pressing and pressing her tree-trunk thighs together. "Oh, god...what would Mum and Dad say?" Cindy groaned, casting her eyes around the room in search of even the smallest bit of fabric to cover herself. Justin wanted to hug her, tell her none of this was her fault...but the issue of his erect penis was still very much a factor. He held his arms up, then put them back down, dismissing the idea. "Cindy...I...wait!" He had an idea, there was something she could put on. It wasn't much, granted, but...

"W-what?" She kept shifting the position of her arm, keenly aware she had far too much tit for it to stand a chance of truly hiding.

"I have something you can put on. Just...just for now!" Justin turned his back to her, grateful to have an excuse to get his cock out of sight for a moment, and went over to his bed, kneeling to reach under it, then extracting a scrap of cloth. Cindy squinted, it looked small as he held it up, very small. To her dismay, she was right. Justin unfolded it, and she saw that it was some sort of white apron. It didn't even look like it would reach past her thighs. She thought of asking if that was all he had, but then, the longer she argued, the longer she'd be naked in front of her brother.