I walked into the cabin and knew right away something was off. Mom was already in the kitchen wearing nothing but an apron, her big tits hanging out the sides, nipples hard from the cold air. My sister Lisa was on the couch with her legs spread, fingering her shaved pussy while Dad watched from his chair, stroking his thick cock.
"About time you got here," Mom said, turning around. She bent over the counter and spread her ass cheeks. "Your sister's been teasing us all morning. Get over here and fuck your mother."
I dropped my bag and walked straight to her. My cock was already rock hard. I grabbed her hips and slammed into her wet cunt in one thrust. She grunted and pushed back, taking every inch. Lisa crawled over on all fours, her mouth open.
"Give me some of that too, big brother," she said, licking my balls while I pounded Mom.
Dad stood up and fed his cock into Lisa's mouth. She sucked him sloppy and loud, spit running down her chin. Mom's pussy clenched around me every time I bottomed out. I reached under and squeezed her heavy tits, pinching her nipples hard the way she likes.
"Fuck yes, use that family pussy," Mom moaned. "We've been waiting for you."
I pulled out of Mom and shoved my cock straight into Lisa's throat. She gagged but didn't pull back. Dad moved behind Mom and started fucking her from behind, his balls slapping against her ass. The cabin filled with the sound of wet skin and heavy breathing.
Lisa pulled off my dick and turned around, presenting her ass. "Fuck my ass, brother. Stretch it out." I spit on her hole and pushed in. She was tight but took it. I reached around and rubbed her clit while I fucked her ass raw.
Mom and Dad switched positions. Mom sat on the counter and spread her legs so Dad could eat her while he jerked himself. Lisa was moaning nonstop, pushing back on my cock. "Harder. Fuck your sister's ass like you mean it."
I grabbed her hair and yanked her head back, pounding deeper. Her asshole gripped me like a fist. When I felt close I pulled out and told everyone to get on the floor. We piled together in a sweaty mess. Mom sucked my cock clean while Lisa rode Dad's face. I came first, shooting thick ropes across Mom's tits and Lisa's open mouth. Dad followed right after, filling Lisa's pussy while she came on his tongue.
We didn't stop there.

After a quick break we moved to the bedroom. Mom got on all fours again and told me and Dad to take turns on her. Lisa sat on Mom's face and ground her cunt down while we switched holes. Mom's pussy and ass were dripping by the time we finished. Lisa sucked both our cocks at once, her cheeks bulging.
By the end of the weekend every hole in the cabin had been used. Mom swallowed load after load. Lisa begged for double penetration until she was shaking. Dad watched me fuck his wife and daughter and got off on it every time. We didn't bother with clothes after the first night. It was just raw family fucking whenever anyone got horny.
When we packed up Sunday night Mom kissed me at the door. "Next month at the lake house," she whispered. "Bring the lube." I already knew I would.