Chapter 35

Alan and Madison’s breathing was gradually settling, still ragged and uneven, as if their bodies refused to accept what had just torn through them. The orgasm was fading, leaving behind a sticky, humid warmth and a silence that felt anything but empty. Something thick and almost solid hung in the air between them—the forbidden, the line they had crossed, the knowledge that there was no stepping back now.

They looked at each other. Not with the frantic, animal hunger of minutes ago, but with a steady, burning intensity that hadn’t dimmed. Alan could still feel the brutal, barely-leashed want coiled inside him. His fingers were locked around the crumpled sheets, knuckles bloodless, the only thing keeping him from dragging her under him again.

His cock, which had softened against his stomach, was already thickening once more. Slow at first, then with a stubborn, almost spiteful insistence. He couldn’t stop it. Madison lay sprawled naked on the narrow bed of her childhood room, skin gleaming with sweat and the wet evidence of what they’d done—his and hers. Every inch of her was laid bare to him: the heavy sway of her breasts with each breath, nipples tight and dark, the smooth plane of her belly leading down to her cunt, still parted, glistening, offered. He could picture his tongue there—dragging along the soft inner skin of her thighs, dipping into the small of her back, flicking over the swollen clit he’d watched pulse and twitch only moments earlier. The thought alone made him swallow a groan.

Madison watched him too. Her eyes kept dropping, helpless, to her brother’s cock as it rose again—thick, veined, already straining upward. A treacherous heat coiled low in her belly, insistent and traitorous. She wondered, with a cold, frightening clarity, exactly how far she was ready to go. How far she wanted to go. The excitement was raw, threaded through with something darker, more dangerous. The forbidden was no longer a wall. It had become a hunger.

She moved. Silent. Onto her hands and knees, the old mattress groaning under her weight. She crawled toward him, slow, deliberate. Every inch she gained was another boundary crossed, another limit pushed aside with a dark, guilty thrill. Her gaze never left his. The future—whatever came after this room, after this night—didn’t exist yet. There was only the bed, their bodies, and the electric quiet where every breath sounded too loud.

Alan stayed perfectly still. He let her come. He watched her approach, mesmerized, time stretched thin. She stopped close enough that he could feel the heat of her breath on his cock, arched like a cat, back dipped, breasts hanging heavy beneath her. He had a perfect view of the round curve of her ass, the deep line of her spine, the way her thighs were already parted. He didn’t speak. He didn’t reach for her. He gave her the lead.

And in that exact second he understood, truly understood. It was her. Madison. His big sister. The same girl who used to snap at him when he was little, who used to cover for him when he stumbled in late, who knew every fucking thing about him. She was on all fours in front of him now, offered, eyes dark with want, ass lifted, her whole body begging for more. Every part of him screamed that this was wrong. Sick. That she was his sister, for Christ’s sake. And yet the realization didn’t cool him—it made him harder, thicker, the ache almost painful. It sharpened every detail, made everything more obscene, more real.

He couldn’t hold it in. His voice came out low, rough, almost broken.

“Madi...”

Madison didn’t answer. She stayed frozen for a moment on all fours, eyes locked on his. Then, without a word, without warning, she leaned in closer. Her warm breath brushed first against the tight skin of Alan’s stomach. And then her tongue came out. One slow, tentative lick at first—as if even she was surprised by what she was doing.

The rough drag of it swept over smooth skin, gathering a thick, warm streak of dried cum that had been left there. The taste hit her hard: salty, sharp, deeply intimate. She frowned slightly, not from disgust, but from the raw intensity of the act itself. She looked up at him. Straight into his eyes. Mouth still full of that white fluid, glistening on her tongue. Then she swallowed. Slowly. Deliberately. Madison’s throat worked visibly, and the quiet, wet sound of it echoed in the room.