The Offer
Copyright© 2026 by Tharnoren
Chapter 8
Incest Sex Story: Chapter 8 - 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 and Madison froze on the bench, eyes wide, as if Rebecah’s words had just slapped them across the face. The splash of the fountain suddenly felt deafening—an absurd soundtrack for a suggestion that had tipped straight into the surreal. Alan was the first to snap out of it, his voice cracking through the heavy air like a whip.
“What—what? No. Fuck no. Are you out of your mind?”
Madison, cheeks burning, shook her head hard, her body tensing like a drawn bow.
“Absolutely not. That’s ... that’s disgusting. Just—impossible.”
Rebecah, still laughing, wiped a tear from the corner of her eye, her giggles spilling out as if this were all some massive joke. But there was a sharp gleam in her eyes that said otherwise—raw hunger tucked beneath the playfulness. She straightened, setting her bags at her feet with careless ease.
“Relax. I was just throwing it out there.”
Madison’s heart was pounding. She sensed an opening—or maybe a trap—in that apparent retreat. She drew a slow breath, trying to steady herself, and launched into an awkward negotiation, her voice low but set.
“Listen ... about the kiss—we could maybe talk about that. A ... a kiss between brother and sister ... that’s already huge, right?”
Rebecah stared at her for a beat, then burst out laughing again, loud and mocking, loud enough to draw a curious glance from a passerby.
“A kiss? Seriously, Madi? After everything we’ve shared today? Nah. Sorry. That doesn’t do it for me anymore.”
Madison pushed on, cheeks flushing with creeping humiliation, determination winning out—she needed the money, fuck, with the car wrecked and the bills stacking up like dominoes ready to fall.
“Okay, then ... half? Thirty-five hundred? Or even two grand, just for something quick...”
Rebecah shook her head, her smile widening, almost gentle, like she was explaining the obvious to a child.
“Madi ... this isn’t about money. What I want is more than that. Something real. Intense. Not some shy little peck on a park bench.”
She leaned forward, eyes locked on Madison’s, then on Alan’s, dropping her voice for effect.
“Let’s be honest. Twenty-one thousand dollars. Each. For a threesome with me. Picture it—both of you, me, one night where I make you forget everything. Just the images, the touches ... everything that gets you off.”
The number hit them like a sucker punch—twenty-one grand, holy shit, triple what they’d gotten last time. Enough to change everything: fix the car, wipe out debts, buy some breathing room in a student life that was squeezing them dry. Madison felt her pulse spike, dizziness washing over her. She turned to Alan, her look tight, almost pleading, already weighing the pros and cons in some dark corner of her mind. Twenty-one thousand ... fuck.
Alan caught that look—the flicker of doubt in his sister’s eyes—and his stomach dropped.
“Wait—Madi? You’re not actually thinking about this, are you?!”
Rebecah laughed again, a sly sparkle masking her inner triumph, like she was already pulling the strings of a show she’d directed herself. Then, with a theatrically annoyed sigh, she added,
“Alright ... my offer just dropped to ten grand. Because you’re taking way too long to decide.”
They both froze, stunned—the price slashed in half like a masterful bluff. Madison shot back instantly, a reflex that betrayed her completely.
“What do you mean, half?! Fuck, Beca, that’s not—”
Rebecah had them right where she wanted them, and she laughed again, a victorious sound echoing through the arcade.
“Hurry up—” ---
Madison’s heart was hammering so hard it felt like it might crack her ribs. She didn’t even glance at Alan. The words spilled out of her on pure instinct, her voice low and rushed, a rough whisper meant not to draw any more attention in the busy arcade.
“Twenty-one thousand. We agree to the threesome—but Alan and I don’t touch each other. Ever.”
Alan just stared at her, stunned, a guttural sound clawing up his throat like he’d taken a punch to the solar plexus. His eyes flew wide, shock ripping through him like a jolt of electricity, and he opened his mouth to object, the words already colliding on his tongue. But Madison snapped around on him, eyes narrowed into a savage warning, a look that screamed shut the fuck up without a sound. Her lips pressed into a hard line, pinning him in place.
Rebecah, still leaning against the bench with calculated ease, pretended to think it over, tilting her head, tapping a finger against her chin as if weighing every detail on an invisible scale. Her eyes sparkled, but she kept her face serious—almost businesslike—letting the silence stretch just long enough to tighten the noose. Then, with a subtle shrug:
“Twenty-one thousand for both of you. I’ll agree to no penetration ... but everything else—”
Madison shook her head violently, panic flaring, cheeks burning like she’d been dunked in boiling water, a sick, visceral knot twisting in her gut.
“No! Absolutely not! Nothing at all!”
Still reeling from his sister’s audacity, Alan tried to jump in, his voice rising for the first time, words tripping over each other.
“Wait, maybe I get a say—”
Madison cut him off cold, turning back to Rebecah before he could finish. Her voice cracked like an order, desperation driving her into one last reckless offer, like she was bargaining for her own survival.
“Twenty-one thousand dollars. One hour with both of us, but we never touch each other. You can do whatever you want to us.”
That’s when Rebecah smiled—slow, bright, victorious—like she’d been waiting for this exact moment. She straightened slightly, crossing her legs with practiced elegance, and countered in a soft but unyielding voice:
“Two hours. And you accept everything I want to do with you ... and I’ll agree that you don’t touch each other directly.”
A cold shiver slid down Madison’s spine. The word everything blared in her head like a siren, a dull fear clamping around her throat—what did that even mean, everything? She swallowed hard, shaken, her eyes flicking briefly to the bags at their feet before returning to Rebecah.
“Fine. But only one hour.”
Rebecah shook her head, her smile widening, triumph gleaming in her eyes.
“Two hours or nothing.”
Madison froze, trapped, suddenly short of air, like the bench had closed in around her.
“Fuck,” she spat under her breath, fists clenched tight on her knees, the word slipping out like an admission of defeat.
Rebecah knew she had it in the bag. A thrill of excitement ran through her; without even sparing Alan a glance, she extended her hand toward Madison, palm open, sealing the deal like an unspoken pact.
“Okay. Two hours.” ---
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