Mike had been my best friend since college, but the night everything changed started at our family barbecue. My wife Lisa was 32, thick in the hips with big tits that always bounced when she walked, and her younger sister Amy, 28, was staying with us for the week. I knew Mike had been eyeing both of them for months, the way he grinned when Lisa bent over the grill in her tight shorts.
After everyone else left, it was just the four of us in the living room. Lisa had been drinking and she was already flushed. "Mike, you always stare at my ass," she said straight out, laughing but not hiding it. I sat there on the couch, my cock twitching even though I tried to play it cool. Mike didn't laugh back. He just stood up, walked over, and grabbed Lisa by the waist.
"Damn right I do," he said. "And tonight I'm gonna fuck it while your husband watches." Lisa looked at me, her eyes dark. She didn't say no. Instead she pulled her top off, those heavy tits spilling out, nipples hard. Amy sat in the armchair, legs spread a little, watching.
Mike yanked Lisa's shorts down and bent her over the arm of the couch right in front of me. Her pussy was already wet, shaved smooth. He dropped his pants and his thick cock slapped against her ass. "You ready to get cuckolded in your own house?" he asked me, voice low and rough. I nodded, dick straining in my jeans.
He slammed into her hard. Lisa moaned loud, pushing back on him. The sound of skin slapping filled the room. "Fuck, Mike, your cock feels bigger than his," she gasped, looking right at me. I pulled my own cock out and stroked it, watching my best friend pound my wife. Her tits swung with every thrust. Mike reached around and rubbed her clit, making her cum fast, her pussy clenching around him.
Amy stood up then, stripping fast. She had smaller tits but a tight little ass. "My turn," she said, climbing onto the couch beside her sister. Mike pulled out of Lisa, his cock shiny with her juice, and shoved it straight into Amy. She cried out, gripping the cushions. "Oh shit, yes, fuck me too." Lisa watched, fingering herself while Mike railed her sister.
I couldn't stay quiet.
"Fuck her harder," I muttered. Mike grinned and did, pounding Amy until she was shaking. Then he switched back to Lisa, making her take it doggy style again while Amy knelt and licked his balls. The whole room smelled like sex. Lisa came again, screaming my friend's name.
Mike looked at me. "Get over here and watch up close." I dropped to my knees beside the couch. He pulled out and stroked his cock, shooting thick ropes across Lisa's back and ass. Some landed on my shirt. Lisa turned and kissed me deep, tasting like sweat and lust. Amy crawled over and licked the cum off her sister's skin, then sucked Mike's cock clean.
We didn't stop there. Lisa rode Mike on the floor while Amy sat on his face. I jerked off watching, finally shooting my load onto Lisa's tits. By the end of the night both women were sore and dripping, and Mike had claimed them in every room of the house. The next morning at breakfast nobody pretended it was a one-time thing. Mike was coming back every weekend, and I was going to watch him fuck my wife and her sister until they couldn't walk straight.
