The sun beat down hard on the private stretch of sand as our family stripped off the last bits of clothing. Mom's big tits bounced free first, nipples already stiff from the breeze. Dad's thick cock hung heavy between his legs, half-hard already. My sister Lisa, twenty-one and shaved smooth, kicked her bikini bottom aside and grinned. I was twenty-two, my own dick twitching as I watched them all.
"Fuck, this feels good," Mom said, spreading her legs a little as she sat on the towel. "No one around to judge. Just us."
Dad grunted and stroked himself once, slow. "Been waiting all year for this." He looked at Lisa and me. "You two gonna stand there or join in?"
Lisa dropped to her knees in front of Dad without hesitation. She wrapped her hand around his cock and started pumping. "God, Dad, you're so fucking hard already." She leaned in and licked the head, tasting the salt and precum. Dad groaned and pushed his hips forward.
I moved behind Mom. My hands slid over her ass, spreading her cheeks. Her pussy was already wet, lips puffy and glistening. I rubbed two fingers along her slit, then pushed them inside. Mom moaned and rocked back on my hand. "That's it, baby. Finger your mother's cunt."
Lisa took Dad's cock into her mouth, sucking noisily. Spit ran down his shaft as she bobbed her head. Dad grabbed her hair and fucked her throat in short thrusts. "Suck it deep, girl. Show your brother how it's done."
I pulled my fingers out of Mom and lined my cock up. One hard push and I was buried in her hot pussy. She was tight and slick, gripping me as I started pounding. The wet sounds of my balls slapping her ass mixed with Lisa's slurping. Mom reached back and spread her own ass wider. "Harder. Fuck me like you mean it."
Dad pulled out of Lisa's mouth and flipped her onto her back on the sand. He spread her legs and slammed into her in one stroke. Lisa cried out, legs wrapping around him. "Yes, Daddy! Stretch my pussy!" He fucked her rough, sand sticking to their skin, his cock driving deep with every thrust.
Mom turned around and pushed me onto my back. She climbed on top, sinking down on my cock again. Her tits swung as she rode me, grinding her clit against my pelvis. "Look at your sister getting railed," she panted. "You like watching Daddy fuck her while you fuck me?"
I grabbed her hips and thrust up hard. "Yeah. Love seeing her cunt full of his dick." Lisa was moaning loud now, Dad's hips slapping against her ass. He reached down and rubbed her clit while he pounded her.
We switched positions fast. Dad pulled out and had Lisa get on all fours. He slid back into her from behind, gripping her hips. I stood in front of Mom, who was on her knees sucking me clean of her own juices. She took me deep, gagging a little, spit dripping onto her tits.
"Trade," Dad said after a minute. He pulled out of Lisa and I moved behind her. Her pussy was red and dripping. I shoved my cock in and started fucking her the same way Dad had. She pushed back, meeting every thrust. "Brother's cock feels so good after Daddy's."
Mom got on her back and spread wide for Dad. He mounted her and drove in, fucking her missionary while Lisa and I watched. Mom's tits shook with every slam. "Fill me up," she begged. "Give me that load."
Dad came first, groaning as he pumped cum deep into Mom's pussy. It leaked out around his cock when he pulled free. Lisa crawled over and buried her face between Mom's legs, licking up the mess. Mom held her head there, moaning while her daughter ate her out.
I kept fucking Lisa from behind until I felt my balls tighten. I pulled out and shot thick ropes across her ass and lower back. Lisa reached back and rubbed it into her skin, then turned and sucked the last drops from my cock.
We stayed naked on the beach the rest of the afternoon. Dad fucked Mom again while Lisa sucked me back to hardness for another round with her. Cum and sweat mixed with sand, everyone talking dirty and switching partners until the sun started to set. No one was in a rush to leave.
