We hit the cabin on a Friday afternoon, the whole crew stripped down before the car doors even shut. Mom had found the place online, a private nudist retreat for "like-minded families," and she was the one who insisted we all try it. Dad laughed it off, my older brother Jake just shrugged, and I went along because I was twenty-two and bored with everything else. By sunset the four of us were sitting around the fire pit with nothing on but sweat and sunscreen.
Mom's body was fuller than I remembered, heavy tits swaying when she moved, dark nipples already stiff from the breeze. Dad's cock hung thick and soft between his legs, swinging as he poked at the logs. Jake looked like a younger version of him, leaner, his dick resting against one thigh. I kept catching myself staring at both of them and then looking away, heat crawling up my neck.
Nobody said anything about it at first. We cooked, we drank, we talked about normal shit. But every time Mom stood up her ass flexed and I saw the soft lips between her legs part slightly. Jake's cock started to thicken after the second beer. He didn't hide it. None of us did. That was the point.
After dark Mom suggested the hot tub. We all climbed in, the water bubbling around bare skin. Dad sat across from me, his cock floating up fat and half-hard. Mom slid in beside him and casually reached under the water. I watched her fingers wrap around him and start a slow stroke. Dad groaned and spread his legs wider.
Jake was next to me. His thigh pressed against mine. I felt his hand land on my knee, then slide up. "You good with this?" he asked, voice low. I nodded. His fingers found my pussy under the water and pushed two inside without any more warning. I bit my lip and rocked my hips.
Mom noticed. She smiled, slow and dirty. "That's it, baby. Let your brother feel how wet you are." She climbed onto Dad's lap right there, sinking down on his cock with a wet sound that carried over the bubbles. Her tits bounced as she started riding him.
Jake pulled me onto his lap facing him. His cock was rock hard against my stomach. He lifted me, lined up, and dropped me down onto it in one thrust. I gasped, full in one go. He grabbed my ass and started fucking up into me while Mom and Dad watched and kept going.
We switched positions a few times. Mom ended up on her back on the edge of the tub with Dad pounding her while Jake bent me over the side and took me from behind. Every time I looked over, Mom's eyes were on us, her mouth open, moaning louder when she saw her son balls-deep in her daughter.
Later we moved to the big bed inside. No one bothered with towels. Mom lay in the middle, legs spread, Dad eating her pussy while Jake fucked me right beside them. I came hard, clenching around my brother's cock, and Mom reached over to pinch my nipple while I shook.
By morning we'd stopped pretending there were any rules left.
Mom sucked Jake's cock while Dad fucked me. Then we swapped. Jake came on my tits and Mom licked it off. Dad filled Mom's pussy and I sucked his load out of her while Jake watched and got hard again.
We stayed the whole weekend. Clothes stayed in the bags. Every room, every surface, every combination we could think of. By Sunday night we were all sore, marked with hickeys and bite marks, and already talking about booking the cabin again next month. No one called it weird. It just felt like the most natural thing we'd ever done.
