I walked into the old family house knowing exactly what was waiting. Mom had the candles lit in the living room, the same way she had every full moon since I turned eighteen. Dad was already naked on the big couch, his thick cock half-hard and resting against his thigh. My sister Lena stood by the fireplace in nothing but an open robe, her heavy tits and shaved pussy on full display.
“Strip,” Mom said the second the door closed. Her voice was low and direct, the way it always was during ritual night. I dropped my clothes on the floor and my cock sprang up fast.
Lena came over first. She wrapped her hand around my shaft and gave it two rough strokes. “Been thinking about this all month, little brother?” She sank to her knees and took me straight into her mouth, no teasing. Her tongue worked the underside while she sucked hard, cheeks hollowing. I grabbed her hair and fucked her face the way she liked it, deep and steady until spit ran down her chin.
Dad watched, stroking himself to full thickness. Mom moved behind me and pressed her big soft tits against my back. Her nipples were stiff. She reached around and cupped my balls while Lena kept sucking. “Save that load for my cunt,” Mom whispered. “Ritual rules.”
Lena pulled off with a wet pop and stood up. She bent over the arm of the couch, ass up, and spread her cheeks. “Fuck me first then. I want it rough.” I lined up and drove straight into her tight pussy. She was dripping already. I pounded her hard, hips slapping, while Dad moved in front of her so she could suck him at the same time. Mom sat on the couch beside us and fingered herself, watching.
Lena moaned around Dad’s cock every time I bottomed out. Her pussy clenched and fluttered. I reached under and rubbed her clit fast until she came hard, legs shaking, juices running down my balls.
I pulled out and Mom took my place on the couch, lying back and spreading wide. “Your turn, baby. Fill Mommy up.” I climbed between her thighs and shoved in. She was hotter and wetter than Lena, her cunt gripping me like it was made for my cock. I fucked her deep and steady while Dad moved behind me. He spat on my asshole and pushed two fingers in, working me open.
When he replaced his fingers with his cock, I groaned into Mom’s neck. The stretch burned good. He started fucking me while I fucked Mom, the three of us rocking together. Lena straddled Mom’s face and lowered her pussy onto Mom’s tongue. Mom licked and sucked Lena’s clit while I kept driving into her.
We moved like that for a long time, bodies slick with sweat, the room filled with wet sounds and grunts. Dad pulled out of my ass and fed his cock to Lena instead. She took it down her throat while Mom came hard under me, her pussy pulsing and squirting around my shaft.
I flipped Mom onto her hands and knees and took her from behind. Dad lay under her so she could suck him while I fucked her. Lena climbed onto Dad’s face and ground her pussy on his tongue. The ritual always ended the same way: everyone coming inside someone else.
Mom came again, then Dad flooded her mouth. Lena followed, soaking Dad’s face. I grabbed Mom’s hips and slammed in deep, shooting thick ropes of cum straight into her cunt. I kept pumping until every drop was in her, then pulled out slow so it could leak down her thighs.
Lena licked it up off Mom’s skin while Dad watched. Then Mom pulled me down for a long kiss, sharing the taste of Dad’s load with me.
“Same time next month,” she said, wiping her mouth. “Bring more energy.

We’re not done expanding the ritual.”
I nodded, already half-hard again at the thought. The family never skipped a full moon.