John slammed the door behind him after catching his wife Karen riding his best friend's cock on their living room couch. The image burned in his head—her tits bouncing, that slut moaning like a whore while she cheated. He needed payback, raw and filthy. His sister Lisa had been texting him all week about her own cheating husband. She was pissed too, and she was family. Blood. That made what he was about to do even dirtier.
He drove straight to Lisa's place. She opened the door in a tight tank top and shorts, her big tits straining the fabric. "Karen fucked around on you?" she asked, already knowing. John grabbed her by the waist and shoved her against the wall. "Yeah, and we're gonna make them both pay." He kissed her hard, tongue deep, hands ripping her top down to free those heavy tits. Lisa moaned and grabbed his crotch, feeling his cock already rock hard.
"Fuck me, big brother," she whispered, dirty and direct. "Make it hurt."
John didn't waste time. He pushed her to her knees. Lisa unzipped him, pulled out his thick dick, and swallowed it straight to the back of her throat. She sucked like she was starving, spit dripping down her chin while she gagged on it. "That's it, suck your brother's cock," he growled, fucking her face. She looked up at him with those slutty eyes, drool running everywhere.
He hauled her up, bent her over the kitchen table, and yanked her shorts down. Her pussy was shaved and dripping. John slammed into her from behind in one thrust, burying every inch in his sister's tight cunt. Lisa screamed and pushed back, taking it all. "Harder, fuck me harder! Revenge fuck this cheating wife's sister!"
He pounded her raw, balls slapping her ass with every stroke. The table shook. Lisa reached back and spread her cheeks so he could go deeper. "Your wife is a whore, but I'm your whore now," she panted. John grabbed her hair, yanked her head back, and drilled her harder. Her pussy clenched around him, wet and sloppy.
They moved to the bedroom. Lisa climbed on top, sank down on his cock, and rode him like she was possessed. Her tits bounced in his face.
He sucked her nipples hard while she ground her clit against him. "Come in me," she begged. "Fill your sister's cunt so we can send those cheating fucks a message."
John flipped her onto her back, legs over his shoulders, and fucked her deep and mean. He slapped her tits, called her a dirty incest slut, and she came screaming, pussy pulsing around his dick. He didn't stop. He kept slamming until he unloaded, pumping thick ropes of cum deep inside her. Lisa milked every drop, legs locked around him.
They didn't stop there. Over the next hours they fucked in every position—Lisa on all fours getting her ass smacked red, John eating her creampied pussy then fucking her again, her riding reverse so he could watch his cock stretch her. They talked filthy the whole time, planning how to rub it in their spouses' faces. Lisa even called Karen's phone and left a voicemail moaning John's name while he fucked her.
By morning they were spent, bodies covered in sweat and cum. John sent Karen a photo of Lisa's cum-filled pussy with the text: "Payback's a bitch, and so is your sister-in-law." Lisa did the same to her husband. The revenge was complete, dirty, and exactly what they both needed. Their cheating spouses could choke on it while they kept fucking.
