The Offer
Copyright© 2026 by Tharnoren
Chapter 13
Incest Sex Story: Chapter 13 - 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
Alan let out one final raw, guttural groan, his hips arching in a last desperate thrust as he stroked his still-swollen cock. Weak spurts of cum dribbled out, beading at the tip before spilling over his clenched fingers and splattering across Rebecah’s upturned face. She was still laughing, eyes narrowed in pure, unfiltered bliss.
In that moment, she looked almost ethereal, bathed in the dim glow of the hotel room light, her radiant smile cutting through the thick, sticky air heavy with shame and sweat that clung to everything. As if none of it was filthy. As if this was all just harmless fun.
She trailed a finger along her lips, scooping up a thick streak of white from her cheek, and licked it slowly, deliberately—her tongue dragging across her skin with exaggerated relish, a greedy “hmmmmm” humming deep in her throat, like she was tasting fresh frosting straight from the bowl.
But her eyes held nothing angelic. They locked onto Madison, kneeling there naked and shaking, with a twisted gleam full of dark promises, silently saying: your turn now.
Madison jerked back, her knees scraping the floor, heart slamming so hard she thought it might burst.
“N-no ... no, no!” she stammered, voice cracking, high and frantic, words tumbling out in a strangled rush.
It hit her all at once, brutal and undeniable—what was coming next.
The horror she’d sensed lurking from the start, but refused to acknowledge.
Rebecah didn’t answer right away.
She just smiled wider, conspiratorial, then let out a lower laugh this time—vicious, intimate, rolling through the room like a shared secret. She flicked her gaze up to Alan, quick enough to make sure he wasn’t missing a thing, that he was fully present as the unwilling witness.
And he was: eyes wide, bloodshot, breath caught in his chest like he’d been holding it for minutes.
He’d figured it out too. Fuck, how could he not.
Rebecah gathered more cum in her cupped palms, the thick, warm fluid oozing between her fingers, and brought it to her open mouth—an exaggerated “aaaah,” tongue lolling out obscenely, theatrical and filthy, as viscous strands dripped down her chin, coating her swollen lips.
She chuckled again, a muffled, satisfied sound, and beckoned Madison closer with a crooked finger, commanding, like summoning a frightened pet.
Madison couldn’t hold back a sob—a sharp, tearing hitch that wracked her shoulders.
Tears stung her eyes already, but terror pinned her in place, muscles locked, body refusing to bolt. She stayed huddled there, naked, exposed, gaze dropping to the floor as if she could sink into it and disappear.
Then Rebecah moved toward her, almost crawling, smile unwavering, mouth still full and glistening.
Rebecah knelt over her, looming above Madison with full commanding presence, her face still smeared and glistening. She smiled, and in a gesture that was almost tender, almost maternal, she slipped her fingers beneath Madison’s chin, gently but firmly lifting her head to pry open her clenched jaw.
Madison squeezed her eyes shut tight, eyelids fluttering wildly, as if darkness could erase it all, as if closing them might shield her from the nightmare unfolding.
The warm fluid came almost immediately, straight from Rebecah’s mouth—a thick, sticky stream poured in a deliberate flow, splashing onto Madison’s tongue with a wet, lewd sound. She coughed instantly, a violent spasm ripping through her chest, tears spilling from the corners of her sealed eyes.
But Rebecah held her steady, one hand gripping the back of her neck, the other cradling her chin, unyielding and merciless.
The first sensations hit like a blade twisting inside her—a brutal assault on every sense.
The taste came first: salty, sharp and bitter, laced with that unmistakable raw, almost metallic edge that could only belong to cum.
Then the texture—thick and clingy, heavy as it spread across her mouth, coating the roof, seeping between her teeth, flooding every crevice while she pressed her lips together desperately, refusing to swallow, fighting the swelling horror already puffing out her cheeks.
Rebecah eased back just a fraction, enough to give her a pointed nod—insistent, her lips still slick and shining with that smile—and through the blur of tears, Madison caught a fleeting glimpse of Rebecah’s hand sliding between her own thighs, fingers circling fast in tight, frantic motions, subtle but feverish.
She was touching herself, trembling with arousal, breath coming in shallow gasps, as if this twisted scene was the peak of her depraved ecstasy. Madison tried to protest—a low, muffled groan vibrating in her stuffed throat, a desperate “mmmh” that formed no words.
But deep down, she knew. No real choice.
Or at least, none that mattered—the money, that poisoned promise hanging over her, pinned her there more effectively than Rebecah’s hands ever could. Obey, or lose everything. The longer it lingered, the more her brother’s taste claimed her, sinking in like a permanent brand, scorching and inescapable.
The fluid seemed to swell, growing heavier, hotter, as if it were simmering in her sealed mouth, clinging to her tongue, saturating every taste bud with a flavor she’d never erase. Her stomach churned, nausea rising in sour waves, but she held it back still, jaws locked, body shuddering with silent convulsions.
Rebecah leaned in closer, her breath coming in sharp, ragged gasps, face hovering just inches from Madison’s.
“If you want your money,” she hissed in a rough, breathless voice, the words snapping like a command wrapped in a whisper, “swallow. Right now.”
She had slid down to the floor, sitting cross-legged, thighs parted just enough for her hand to vanish between them, working in a discreet, frantic rhythm—a dull, barely audible friction that gave away her raw, primal arousal.
Madison lifted her eyes one last time, tears spilling over in silence, and met Alan’s gaze. His expression was unreadable—a cracked mask, eyes red-rimmed and glistening with unshed tears, but laced with something else, a tangled mess she couldn’t name, a knot that twisted her guts harder than anything.
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