You can't tear your eyes away as your stepsister pulls you closer, her breath hot against your neck, whispering those defiant words that shatter every taboo. "Why don't more people do this?" she murmurs, her voice a sultry challenge laced with forbidden thrill, her body arching into yours like she's been starving for this exact moment. Everyone else freaks out, calls it wrong, but fuck, the way her tight pussy grips your throbbing cock tells a different story: one of raw, addictive ecstasy that makes normal sex feel like a pale shadow. You thrust deep, filling her up with pulse after pulse of your hot cum, and she gasps, her blue eyes locking onto yours, wild and unapologetic. "Come on, give me that cum," she urges, her nails digging into your back as waves of pleasure crash through her, her walls clenching around you in rhythmic surrender. But it's not just the fuck: it's the transformation unfolding right there, intimate and obscene. Her stomach swells beneath your hands, rounding out with every load you pump into her, a slick, sloshing fullness that presses back against your palm. "Does my stomach seem bigger to you?" she asks, half-laughing, half-moaning, as another orgasm rips through her, her juices soaking you both in a messy, unrelenting flood. You feel it too, the addictive pull, like her body's rewriting your senses, every stroke hitting deeper, harder, turning your cock into a vessel for endless release. She rides you relentlessly, her long red hair cascading over tattooed skin, that wicked smile curving her lips as she begs for more. "I want more of that cum in my pussy," she pleads, the air thick with the wet sounds of your union, her curves bouncing with a rhythm that demands you lose control. The tension builds like a storm, her skin stretching taut over the burgeoning swell, every thrust amplifying the sensation until it's overwhelming. Orgasms stacking on orgasms, your Stepbrother's seed flooding her in impossible volumes. You hear the slosh, feel the heat radiating from her core, her body a vessel of pure, taboo indulgence. "Oh fuck, your cock feels so fucking good," she cries, grinding down harder, her pussy milking you dry even as she cums again. It's better than anything, a million times more intense, her addictive heat drawing out load after load until her skirt strains and snaps, exposing the soft, cum-bloated dome of her belly. You rub it, push against the tightness, and she shatters once more, her moans turning to desperate whimpers. "I can't stop... it feels so good, but my skin is so tight." Yet even as the fear creeps in: the way she spits up your cum, her body trembling on the edge of bursting. The pull is too strong, the fantasy too hot to deny. You keep going, lost in the grip of her swollen, insatiable form, every sensation heightened to the point of madness, leaving you both teetering between bliss and the brink.