A Terrible Mistake
Copyright© 2025 by Knobbie Knows
Chapter 4
Incest Sex Story: Chapter 4 - A brother gets caught spying on his sister, resulting in confrontation, a new relationship and blackmail.
Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa Reluctant Heterosexual Fiction Incest Brother Sister Masturbation Safe Sex Voyeurism BBW AI Generated
Chloe’s legs carried her towards the kitchen on autopilot, the cheerful morning birdsong outside feeling like a grotesque parody. The scent of Leo’s burnt toast, usually a comforting mundanity, now choked her. He stood hunched over the counter, shoveling cereal into his mouth, eyes glued to his phone. Oblivious. Safe.
“Hey,” he mumbled around a mouthful, barely glancing up.
Chloe managed a strangled noise, grabbing a glass and filling it with water she didn’t want. Her hands shook, sloshing water onto the counter. She could feel Gemma’s presence like a physical weight, a phantom camera lens already pointed at her back, dissecting her every micro-expression.
“You okay?” Leo finally looked up, a flicker of concern crossing his face, still soft with sleep. “You look kinda pale.”
“Didn’t sleep well,” she lied, the words sandpaper in her throat. The urge to blurt everything out, to shatter this fragile peace with the sledgehammer of truth, warred with the icy terror Gemma had instilled. He’d hate you. He’d be destroyed. Gemma’s words echoed, drowning out the fragile tendril of hope that maybe, just maybe, he’d understand. No. This shame was theirs alone. Or rather, theirs and Gemma’s now.
She forced herself to meet his gaze. She saw the lingering haze of desire she recognized from the past few weeks, a familiar heat that momentarily pushed back the cold dread. He leaned in slightly, his voice dropping conspiratorially. “Later? After Gem’s shift at the library?”
The question, once a secret thrill, now felt like a trap springing shut. Gemma’s demand reverberated: Amplify it. Provoke him. Document his desperation. Chloe swallowed hard, summoning a ghost of the reckless desire that fueled their encounters. Perform. For her.
She let her gaze drop deliberately to his mouth, then back to his eyes, holding it a beat too long. A faint blush crept up her neck, only partially feigned. “Maybe,” she murmured, her voice huskier than she intended. “If you can actually tear yourself away from that game for five minutes.” She added a slight challenge, a teasing edge Gemma would approve of.
Leo straightened, blinking. A slow, familiar hunger ignited in his eyes, the nerdy gamer instantly replaced by the predator who had prowled her bedroom nights. He abandoned his cereal box, taking a step closer. The air crackled, thick with their shared secret and the unspoken third presence listening intently. “Try me,” he breathed, a smile playing on his lips, oblivious to the wires tightening around them both.
Chloe offered a small, tight smile, grabbing an apple she wouldn’t eat. “We’ll see.” She fled the kitchen before her mask could crack, the phantom camera burning into her skin. The performance had begun.
Gemma sat perfectly still in her armchair, bathed in the cool, grey light filtering through her meticulously organized bookcases. Before her, the laptop screen glowed, split into two views. One showed the doorway to Chloe’s bedroom, angled towards the bed. The other, a lower, more intimate angle from a device hidden within the base of Chloe’s reading lamp – reactivated, repositioned. A faint hum emanated from the laptop, the only sound beyond the rapid thudding of Gemma’s own pulse.
Anticipation, cold and sharp, coiled within her. It wasn’t lust, not the messy, hormonal kind Chloe and Leo drowned in. It was the thrill of witnessing raw, unfiltered need. Observing the breakdown of taboo, the dissolution of morality into pure, compulsive hunger. Leo was her subject, his obsession a fascinating pathology she intended to map.
The door opened. Chloe entered, looking deliberately at the lamp’s base – a silent acknowledgment to the eyes Gemma knew were watching. Leo followed, his gaze already locked onto Chloe with a predatory intensity that made Gemma lean forward. He pushed the door shut, the soft click echoing loudly in the tense silence of both the room and Gemma’s study.
“Promised you five minutes,” Leo murmured, his voice thick as he crowded Chloe against the door.
“I said maybe,” Chloe countered, but her voice lacked its usual defiance. There was a breathiness, a tremor that spoke of fear, but also, Gemma noted clinically, a terrible, answering excitement. She was doing it, playing into Gemma’s script.
“Didn’t look like a ‘maybe’ in the kitchen,” Leo pressed closer, his hands finding Chloe’s hips. Gemma watched the screen, rapt. Chloe closed her eyes for a second, gathering herself. When she opened them, Gemma saw the shift – forced bravado mingling with a desperate kind of surrender. Amplify it.
“Get on the bed,” Chloe ordered, her voice lower now, rougher. A flicker of surprise crossed Leo’s face, quickly replaced by heated obedience. He moved, his movements charged with pent-up energy.
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