The river was empty that afternoon, just the way we liked it. I floated ahead on my tube, the cheap black rubber squeaking against my bare thighs every time I shifted. My bikini bottom had ridden up on the last rapid, and I didn’t bother fixing it. Dad was right behind me, his deeper voice cutting through the sound of rushing water.
“Spread your legs a little, baby. Let the water hit you right.”
I did it without thinking, knees falling open. The cold current rushed straight between my thighs and over my pussy lips. A sharp gasp left me. I heard him chuckle, low and dirty.
“Fuck, look at that. Your cunt’s already wet and we haven’t even touched yet.”
We’d been doing this for months. Every weekend we’d drive out, rent tubes, and find a quiet stretch where no one else floated. The first time he’d pulled my tube against his and fingered me under the water I’d come so hard I nearly fell off. Now we didn’t pretend anymore.
I reached back and grabbed the rope tying our tubes together, yanking him closer until his big hand could land on my thigh. His fingers slid under the wet fabric of my bikini and straight into my slick hole.
“Jesus, you’re dripping,” he growled. “Been thinking about Daddy’s cock all morning, haven’t you?”
“Yes,” I panted, rocking back on his two thick fingers. “Want it in me out here. Want you to fuck me while the river pulls us.”
He didn’t waste time. With one rough tug he dragged my tube flush against his, our legs tangling. His swim trunks were already shoved down, his fat cock standing up thick and veined. I climbed over, straddling him on the unstable rubber, and sank down in one wet slide.
The stretch burned so good. I moaned loud, not caring who might hear over the water. His hands gripped my ass, spreading me wider as he thrust up hard.
“That’s it, take every inch. My little girl’s pussy was made for this.”
The tubes bobbed and spun in the current while he fucked me. Water splashed over my tits every time he drove in deep. I leaned back, hands on his knees, letting him watch my cunt swallow his cock over and over. The sun was hot on my skin, the river cold on my clit when it splashed just right.
He reached down and rubbed my swollen nub with his thumb, rough circles that made my thighs shake.
“Come on it,” he ordered. “Come on Daddy’s dick like the filthy little slut you are.”
I came hard, cunt clamping down, body jerking so violently the tube almost flipped.

He held me tight and kept pounding through it, grunting filthy praise.
“Fuck yes, milk me. Gonna fill this pussy up right here on the river.”
He slammed up one last time and stayed buried, cock pulsing hot and thick inside me. I felt every spurt, felt it leak out around his shaft and mix with the river water.
We floated like that for a while, his softening cock still twitching inside me, my head on his shoulder. The current carried us lazily downstream.
“Next rapid,” he murmured against my ear, already getting hard again, “I’m bending you over the tube and taking that ass.”
I smiled against his neck and rocked my hips, feeling him swell inside me once more.
The river had miles left. So did we.