Wife's Wet Betrayal: A Cheating Skinny Dipping Sex Story You Can’t Resist

The lake was deserted, still warm in the early evening as the sunlight danced on the water. Cassie, petite with freckles dusting her tanned shoulders and honey-blonde hair twisted up in a loose bun, stood at the dock and toed off her sandals. She cast a glance behind at Mark—her husband’s best friend—tall, broad-shouldered, jet-black hair always falling into his sharp blue eyes. She grinned, mischievous, pulling her shirt over her head. No bra. Her tiny pink nipples peaked in the fresh air, and Mark’s pulse hammered.

“C’mon, Mark. Don’t be shy,” she teased, wiggling out of her shorts and panties, bare ass gleaming, her trimmed blonde patch just visible as she dove into the water with a splash. He hesitated for a moment, glancing nervously toward the house up the hill where Cassie’s husband, Brad, was passed out on the couch after too many beers. But Cassie’s laughter carried over the water, her head bobbing, eyes daring him.

He stripped down, cock already twitching in anticipation, and leapt in. The cool water wrapped around his naked body, and he surfaced near her, close enough to see water beads glistening on her breasts.

Cassie glided closer. “You ever skinny dipped with someone else’s wife?”

He smirked, heat in his voice. “Never. You?”

She grinned, flicking water at him. “No. But I’ve always fantasized about breaking rules.”

They floated silently, tension thick as Cassie’s foot brushed his calf, slid up between his thighs under the water. He shivered, cock swelling, nerve endings set on fire as her toes traced his length.

“You’re hard already,” she whispered, breathless. “Let’s see if you can keep up with me.”

He swam forward, grabbing her by the waist. She wrapped her legs around him, body slick and hot even in the cool water.

“Your cock feels so good between my thighs,” Cassie moaned, hips rolling. “I want you to fuck me under the sky—while Brad’s inside.”

Mark’s lips crashed on hers. She opened eagerly, tongue sliding against his, biting his lower lip. He slid a hand down, fingers slipping over her soaked pussy, feeling her clit throbbing against his touch. She gasped, grinding down on his hand.

“God, Mark. Rub my clit. Get me even wetter. I need your cock in me—right now.”

He obeyed, thumb circling her clit as he pressed two fingers inside her, feeling her walls clench tight. Her nails raked down his back under the water, her whimpers muffled by his mouth.

She broke the kiss, breath ragged. “Don’t you dare stop playing with my pussy.”

Mark groaned, his own need overwhelming him. He shifted, positioning her at the edge of the dock. Cassie gripped the wood, tits hanging heavy as he guided his cock to her dripping slit, gliding the head up and down her folds.

She arched her back, desperate. “Put it in. Make me your dirty little slut. Fuck me while he sleeps.”

He thrust in hard, burying his cock inside her tight, slick pussy, both of them crying out. Her legs locked around him, the water cool against their hot flesh.

“God yes, stretch me out. Your cock feels so much bigger than his. Fuck me harder, Mark. Don’t be gentle.”

He pounded into her, every thrust sending shockwaves up her spine, water sloshing around their bodies. Cassie’s tits bounced, nipples stiff, her cunt swallowing every inch of him.

She raked his hair and bit his shoulder, moaning, “Rub my clit while you fuck me. I want to cum all over your cock.”

He obeyed, circling her swollen clit as he drove into her pussy, feeling her start to quake, body shuddering around him.

“I’m gonna cum! Fuck, don’t stop! I need it, I need it so bad!”

Cassie screamed as her orgasm ripped through her, pussy clamping tight, juices gushing out around his cock. Mark barely kept it together, groaning as she milked him with every pulse. He pulled out just in time, flipping her over so her ass perched out of the water over the dock.

He gripped her hips, spreading her cheeks to reveal her perfect, glistening pussy and tight little asshole. He pressed his cock to her slick folds and buried it again, thrusting from behind while Cassie screamed his name into the open air. Her fingers dug grooves into the wood.

“Take my ass. Fuck it. I want your cock everywhere,” she begged, panting, looking over her shoulder with wild eyes.

He spat on her asshole and rubbed his thumb over the puckered hole, working her open as his other hand slapped her ass, leaving red marks. Cassie bucked, gasping for more.

“Get me ready. I want your cock in my ass. I want to feel you stretch me until I can’t think.”

He pressed a finger in, heard her moan, then another, gently scissoring until she was writhing. Then, lining up, he pushed his cock against the tight ring, letting the wetness from her pussy trickle down to ease the way. He pressed forward, inch by inch, until her ass swallowed him up.

“Oh fuck, yes—fill my ass! Fuck me harder!”

He pounded her, his balls slapping against her slick pussy. Cassie went wild, her hand reaching down to rub her clit while he slammed into her ass, her whole body bouncing as the dock creaked under the rhythm.

“Give me all your cum. Fill me up—fuck, Mark!”

He grunted, close, her ass so tight he could barely hold on. She reached a second orgasm, pussy spasming again. Mark lost control, thrusting deep, cock pulsing as he shot rope after rope of hot cum deep into her, filling her ass until it leaked out and mixed with the lake water below.

Cassie slumped against the dock, spent, cum dripping from both holes, body trembling with aftershocks. Mark leaned over, kissing her neck, both of them still shuddering.

They floated together in the darkening water, secret lovers under the stars—sated, dirty, and aching for more.