John slammed the door behind him after work and found his sister Lisa already naked on the couch, legs spread wide. "Get over here and fist my cunt, big brother," she growled. "I've been thinking about your thick hand all day."
He didn't waste time. He dropped his pants, cock already hard, and knelt between her thighs. Her pussy was shaved smooth and dripping. He shoved two fingers straight in, then three, twisting them deep. "You want the whole fist tonight?" he asked, voice rough.
"Fuck yes. Ram it in me." Lisa bucked her hips. John curled his thumb and pushed. Her cunt lips stretched around his knuckles, then swallowed his whole hand with a wet squelch.
He made a fist inside her and pumped it hard, wrist-deep. Lisa screamed and grabbed her own tits, pinching her nipples.
"Harder, brother. Wreck that pussy." He punched his fist in and out, her juices running down his forearm. Every thrust made her belly bulge. She came once, squirting around his wrist, but he didn't stop. He kept fisting her sloppy hole until she begged for the other one.
"Ass now. Fist my ass too." Lisa flipped onto all fours, reaching back to spread her cheeks. Her asshole winked, already lubed from earlier play. John pulled his dripping fist from her cunt and pressed it straight against her tight ring. "Open up, sis." He pushed. Her asshole stretched wide, burning around his knuckles until his hand popped inside. He made another fist in her guts and started punching.
Lisa howled, pushing back onto both fists at once. One in her wrecked pussy, one in her stretched ass. John worked them in rhythm, feeling his own knuckles through the thin wall between her holes. "Take it, you dirty incest slut. Both holes fisted by your brother." He twisted and spread his fingers inside her, making her gape.
She came again, ass and cunt clenching around his wrists. John yanked his hands out, leaving both holes open and red. He slammed his cock into her gaping pussy first, fucking the loose, sloppy mess he'd made, then pulled out and drove straight into her fist-stretched asshole. He pounded her ass raw until he filled it with cum.
Afterward he shoved his fist back into her cum-leaking pussy while she sucked his cock clean, both of them already planning the next round of incest fisting.
