The Offer
Copyright© 2026 by Tharnoren
Chapter 14
Incest Sex Story: Chapter 14 - 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 a raw, guttural groan that rumbled up from deep in his chest as he drove into Rebecah with one savage thrust. The first stroke was pure instinct—violent, unstoppable.
Rebecah cried out at the exact same moment, a sharp, desperate sound that died against Madison’s lips because she still hadn’t broken the kiss. Their mouths stayed fused, tongues sliding and twisting in a frantic, sloppy tangle while Rebecah’s back bowed sharply under the impact. “Fuck...” Alan hissed through clenched teeth, voice ragged, almost pleading. His hands clamped down on Rebecah’s firm, rounded ass, fingers digging deep into the flesh, and then he really started to move.
The rhythm took over fast and hard, no hesitation, as if his body had seized control.
Rebecah’s pussy was tight, scorching hot, and every pull back, every slam forward dragged another rough growl from him.
The mattress was already creaking beneath them, a steady, heavy beat that matched the wet, sharp slap of his hips against her ass.
For Madison, lying on her back with her legs spread wide to make room, it was sensory hell.
There was no escape from the sounds. Alan’s low, animal grunts.
The rhythmic, slick smack of his pelvis crashing into Rebecah’s cheeks. Rebecah’s high, broken moans spilling straight into Madison’s mouth because she refused to stop kissing her.
Rebecah’s tongue pushed deeper, greedy, claiming, as if trying to swallow every muffled cry.
Madison could barely breathe; each inhale was stolen between bruising kisses, each exhale smothered by the mouth covering hers. And yet, even with the panic twisting tight in her throat, she kept her eyes wide open.
She saw everything. Alan loomed above them—tall, overwhelming, muscles taut and gleaming with sweat. Broad shoulders flexing, arms bulging with every thrust, abs clenching hard on every withdrawal.
His face was twisted in raw pleasure, mouth open on hoarse groans, eyes half-lidded. He was lost in it, completely unrestrained, and the sight hit her like a slap. Every thrust rocked both their bodies.
Madison felt the shockwaves travel up her spine as if she were the one taking the full force of him. It was a sick, shameful illusion—she felt like he was fucking her.
Not Rebecah. Her.
Even though nothing of him actually touched her, even though it was Rebecah’s body absorbing every brutal stroke. Still, the power of his movements rolled through her. The mattress dipped and rose, shaking her in perfect sync with him.
Worst of all, she couldn’t look away. Rebecah kept devouring her mouth, but her moans were growing wilder, less controlled.
At one point she almost broke the kiss, just long enough to let a choked cry escape against Madison’s lips before diving back in, unable to stop herself.
Her focus was fracturing—split between the thick cock filling her and the mouth she was ravaging.
Madison couldn’t think anymore. Too much noise. Too much sensation.
Too many stolen glances at her brother looking this feral, this unhinged, this utterly primal.
The thought terrified her as much as it seared through her. She was pinned beneath them, naked, exposed against her will, jolted by her brother’s relentless thrusts through another woman’s body—and powerless to close her eyes.
Madison kept getting rocked like a broken doll, the mattress passing on every brutal jolt without mercy. Rebecah had completely come undone—she wasn’t herself anymore, just a bowed, surrendered body riding the surge that tore through her.
The kisses slowed to scattered brushes, then stopped entirely; she slid sideways, chest still crushed to Madison’s, head hanging loose, mouth wide as raw, piercing moans spilled out unchecked, jagged and helpless.
The shift opened everything up.
Alan was right there, inches away, his whole frame owning the space above them.
He drove into Rebecah with unrelenting force—hips snapping forward like machinery, thighs flexing hard with every deep plunge, veins standing out on his forearms as he clamped tighter on her ass. His growls rolled low and guttural, swallowing almost every other sound.
Each thrust shoved both women backward in perfect time, a rolling motion that ground Madison’s breasts against his chest and forced her spine into an unwilling arch.
It was unreal—this rhythm that chained them together, unbearable in its closeness, yet thick with a sick strangeness that clung like cold sweat. As if Alan were hammering into both of them at once, his pelvis dictating the tempo for their stacked bodies.
Then, without warning, Alan’s thigh grazed Madison’s.
Barely a touch at first—just a shift of weight as he angled deeper into Rebecah, a simple, mechanical adjustment.
But skin on skin, slick and fever-hot, turned the moment razor-sharp. Forbidden heat.
She felt the rigid muscle of his thigh press against the soft inside of hers, right at the most tender stretch of flesh. No one else registered it—Rebecah too lost in her own cries, Alan too locked in his rhythm—but for Madison it was an electric shock, a brand that pinned the nightmare to her body. Still, she didn’t move her leg.
Not yet. Some invisible thread held her in place; she let the pressure build with every stroke.
The friction settled into a steady pulse—his thigh sliding along hers on the withdrawal, grinding harder on the drive in, smearing shared sweat between them. She realized, with a jolt, that she’d been staring at him for minutes: eyes fixed on his flushed face, on the sweat tracing down his clenched jaw, on shoulders working like pistons.
Caught in the thick haze, rocked by her brother’s relentless hips, she’d forgotten to blink, forgotten to breathe.
Then his gaze locked on hers. Sudden, piercing, pupils blown wide in the middle of a growl.
Madison yanked her leg away in one sharp jerk, heart slamming into her throat.
The contact broke, but the ghost of it burned.
Too late. He’d seen.
His eyes flicked down for an instant to the place their thighs had met, then lower—lingering on Madison’s exposed sex, glistening against her will under the harsh light.
When he dragged his gaze back to her face, holding the stare she couldn’t break, his rhythm stuttered—just a heartbeat—hanging in the raw, wordless current between brother and sister.
A treacherous jolt—unintended, undeniable—slammed into Alan’s gut. In one blinding instant he knew exactly what he had brushed, what he had kept pressed against his skin.
The knowledge speared straight through him. He lifted his eyes. Madison hadn’t looked away once.
Her pupils were huge, glistening with tears she refused to let fall and something else she wouldn’t name.
They stared at each other, suspended in a silence that roared louder than everything else.
Alan’s rhythm faltered. His thrusts turned slow, deliberate, as though he wanted to stretch this moment where nothing existed but their locked gazes.
Less savage. Deeper. Each stroke lingered, almost aching in its restraint.
Rebecah didn’t agree.
A frustrated, almost whining moan escaped her, and she started rocking her hips herself—faster, greedier—chasing the lost pace. She arched harder, driving herself onto him with frantic urgency.
Madison felt her brother’s gaze drifting, returning, lingering on her heaving breasts, on the clench of her stomach, on her face flushed with shame and surrender.
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