The Offer
Copyright© 2026 by Tharnoren
Chapter 12
Incest Sex Story: Chapter 12 - College siblings Alan and Madison meet wealthy, provocative Rebecah at a wild night out. Her shocking offer—for them to indulge her taboo fantasy for cash—pulls them into a spiral of seduction, blackmail, and forbidden intimacy they can’t escape.
Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa Blackmail Coercion Consensual Romantic Heterosexual Fiction Incest Brother Sister Humiliation Light Bond Rough Group Sex Anal Sex Analingus Cream Pie Facial Masturbation Oral Sex Spitting Slow Violence Illustrated
Madison watched the scene from mere inches away from Rebecah, her face so close she could feel the heat of her ragged breathing, the subtle vibrations in her throat as she took him deeper.
She was shocked, outraged, caught off guard by this raw brutality in Alan—those sharp, violent thrusts driving his cock deep into Rebecah’s mouth without any restraint. And Rebecah took it all without a flinch, eyes half-lidded, even moving on her own to meet him, picking up the pace as if she relished this twisted reversal of dominance.
She lifted her gaze to Alan, searching for his face above them, and what she saw hit her like a punch: his features twisted in ecstasy, mouth hanging open on guttural groans, veins bulging at his neck. In that moment, a strange compassion washed over her—almost pity, seeing him just as helpless under Rebecah’s spell, reduced to this mindless beast lost in sensation, strung along like a puppet.
But it didn’t last; disgust flooded in right after, tangled with a dull fear that knotted her gut.
She didn’t recognize the man looming over them, or at least not this side of him—so intimate, so brutally exposed, something a sister should never brush against, let alone witness laid bare like this, unfiltered.
She stayed there on her knees on the carpet, embarrassment sinking into her bones, unsure what to do with her hands, her naked body that suddenly felt too exposed, too fragile.
At one point, Alan tore his focus from Rebecah—just for a second, his hips slowing—to lock eyes with her. Madison instinctively hoped to find her brother in that glance, to share some simple, knowing look, not necessarily tender or loving, just something familiar to ground this madness in reality.
But what stared back froze her in place: his bloodshot eyes raking over her with perverse hunger, scanning her face, her still-parted lips, then dropping shamelessly to her breasts, her kneeling naked form, as if she were nothing more than another object in the room.
No hesitation, no shame—just that raw lust pinning her down.
Rebecah had seized control of the blowjob again, her hand at the base guiding the rhythm, even daring to glance up and watch the exchange between them. She almost smirked around his cock, a triumphant gleam in her eyes—she’d won her bet, and Madison realized it in the same instant, the truth twisting her stomach like a knife.
Madison pieced together what Rebecah had been aiming for all along—not entirely certain, but Alan’s face and body screamed it clear: she could be next, that hazy line the three of them had been skirting had just shifted dangerously closer to her. She saw his gaze linger on her mouth, fixate on her heaving breasts as her panicked breaths made them rise and fall, all while he moaned under Rebecah’s tongue, which was clearly toying with the moment, speeding up just to push him further over the edge.
Alan was gone, lost in that haze where nothing had names anymore, identity dissolved. And Madison knew full well she was reduced to a naked body in front of him, an unwilling offering, and the knot in her belly erupted—the unease exploding into visceral terror that multiplied until nausea clawed at her throat. ---
Rebecah finally slowed, releasing Alan’s cock with a wet pop that echoed through the room like a temporary period at the end of a sentence.
She caught her breath, jaw aching—from Madison earlier, those endless minutes spent lapping at her until she shattered, and now from Alan, the prolonged thrusts that had left her lips swollen and the muscles in her neck taut.
She smiled at Madison, a wicked, conspiratorial glint in her eyes, before diving back one last time onto his throbbing shaft, her tongue diligently gathering as much of the slick mix of saliva and precum beading at the tip as she could, collecting the thick, sticky fluid without any rush.
Then she turned to Madison, still kneeling beside her, and leaned in to kiss her—mouth dripping, loaded with that heavy, salty load that spilled immediately onto Madison’s lips on contact.
Madison jerked back instinctively, a sharp twist of her head, eyes wide with pure revulsion, but Rebecah gripped her hair firmly, pulling her close by force and deepening the kiss without giving her any way out.
Inside Madison’s mind, everything blurred: Rebecah’s tongue, hot and insistent, invading her mouth with treacherous wetness, then that salty taste exploding across her tongue—viscous, intimate, something she refused to name but recognized anyway as her brother’s arousal, the precum harvested from Alan.
She could only respond timidly, lips trembling, a passive surrender heavy with gut-deep shame, feeling defiled to her core, as if that fluid branded her in some irreversible way. Rebecah finally pulled back, grasping Madison’s jaw in a firm but not brutal hold, fingers tight just enough to make the message clear: swallow.
Madison gulped it down, throat constricted, the lingering taste searing her tongue, a wave of nausea she forced back along with the tears welling up. Breathing hard, eyes shimmering with unshed tears, she lifted her head to Alan—and this time, his face showed raw surprise, embarrassment creasing his features, even as he kept jerking himself off frantically while watching her, hand sliding over his glistening cock without slowing, as if his body refused to heed what his expression betrayed.
He hadn’t missed a thing, eyes glued to them like he couldn’t even blink.
His lust had surged despite himself, a new sensation twisting his insides—this pure taboo, the adrenaline pumping alongside his blood, something he’d never felt before, raw and electric. He couldn’t lie to himself: it was the hottest thing he’d ever witnessed, the sight of his sister swallowing against her will, soiled by what he’d left on Rebecah’s tongue. He was rock-hard to the point of pain, hand pumping furiously without pause, but some hazy awareness lingered—the fear in Madison’s face, the sadness, tears at the corners of her eyes—and it plunged him into a conflicting storm, arousal and shame warring inside him like feral animals.
It was Rebecah’s laugh that snapped them both out of it, a low, naughty burst that sliced through the thick air.
“Wow, just say the word if you want me to leave you two alone,” she teased, voice playful, as she licked her lips slowly with the back of her tongue, like she was still savoring the flavor.
She turned to Madison, still on her knees, panting and frozen, and added with a smirk: “He was clearly eye-fucking you hard earlier. You noticed, right?”