Midnight Fling: My Wife's Sister at the Rooftop Pool

I told myself I wouldn’t go. Sarah had been gone three days on that Denver conference, and the apartment still smelled faintly of her perfume on the pillows. Jenna had been crashing in the guest room for a week while she looked at condos, all sunny smiles and stretchy yoga pants, my wife’s younger stepsister who had always been a little too flirty for comfort. Twenty-six, flexible as hell, that wicked little mouth that said things just this side of inappropriate at family dinners. I’d buried it for years. Married men don’t notice how their wife’s stepsister’s ass looks when she bends to load the dishwasher. Except I did. Every fucking time.

My phone lit up at 11:47 p.m.

Pool’s empty. Come swim. Harmless. Promise. —J

Harmless. Right. I stared at the message long enough for the screen to dim, cock already stirring against my sweatpants like it had been waiting for permission. Sarah trusted me. Sarah was across the country closing some deal. And Jenna was three floors up on the rooftop deck of our building in nothing but whatever scrap of fabric she called a bikini.

I went anyway.

The elevator ride felt endless. Cool night air hit me when the doors opened onto the deserted pool deck—city lights glittering beyond the glass barrier, the water glowing an unreal turquoise under the underwater LEDs. No one else. Just the soft slap of water against tile and Jenna floating on her back in the shallow end like she owned the night.

Jesus Christ.

The string bikini was black, tiny, criminal. Two triangles of fabric that barely covered her nipples, tied with thin cords that disappeared into the valley between her full, firm tits. The bottoms were worse—little more than a V of cloth that vanished between the toned cheeks of her ass when she rolled over and stood. Water sheeted down her body. Yoga had carved her into something lethal: flat stomach with that soft little shadow of definition, hips flared just enough to grip, long legs still beaded with droplets. Her dark hair was slicked back, makeup-free face glowing, lips parted in a slow smile when she spotted me.

“Took you long enough,” she called, voice low and teasing. “I was starting to think you’d chickened out, Mark.”

I walked to the edge like a man approaching a cliff. “It’s late. You shouldn’t be up here alone.”

“I’m not alone now.” She waded closer until the water lapped at the tops of her thighs. Those nipples were hard from the cool air, poking blatantly against the wet triangles. “Sarah would want you to keep me company. Big protective brother-in-law and all.”

Brother-in-law. The word tasted like ash. We both knew the truth of it—the looks that had lingered too long at Christmas, the accidental brush of her hand against my cock that one Thanksgiving when she hugged me goodbye and pressed her whole body in like she was testing something. Years of it, banked heat neither of us had ever lit.

“You’re trouble,” I said, and my voice came out rougher than I meant.

She laughed, soft and knowing, and climbed the submerged steps until she stood dripping in front of me. Up close she smelled like chlorine and coconut sunscreen and pure bad decisions. Water traced the line of her collarbone, slipped between her breasts, soaked into the fabric until it clung transparent. I could see the dark circles of her areolas, the stiff peaks. My mouth went dry.

“Am I?” She tilted her head, eyes dark under the string lights. “Or are you just finally admitting you’ve thought about this?” One finger traced idle circles on her own stomach, just above the waist of those pathetic bottoms. “I’ve seen you looking, Mark. When I do yoga in the living room. When I wear those little shorts to make coffee. You watch.”

My cock was fully hard now, tenting the front of my sweats without shame. I didn’t bother hiding it. The deserted deck, the locked elevator access after eleven, the fact that Sarah was a thousand miles away—it all stacked into something reckless and hungry.

“Looking isn’t the same as touching,” I said, but it sounded weak even to me. “You’re her sister.”

“Stepsister.” She stepped in closer. Wet heat radiated off her skin. “And she’s not here. It’s just us and this big empty pool and whatever dumb promises we make ourselves.” Her gaze dropped deliberately to the outline of my dick. “God, you’re hard already. Does Sarah know how big you get when you’re thinking filthy things about me?”

I should have turned around. Should have gone back downstairs, jerked off in the shower thinking about my wife’s mouth, pretended this never happened. Instead I watched a drop of water slide from her collarbone straight down into the cleft of her tits and disappear.

“This is a bad idea, Jenna.”

“The best ones usually are.” She reached out—slow enough that I could have stopped her—and laid her palm flat against my chest. Her fingers were cool, damp. They slid down, over my abs, and stopped just above the waistband. “I’ve wanted to know what you feel like for years. Every time you and Sarah left the room at family stuff I’d touch myself thinking about your hands. Your mouth. Whether you’d fuck me rough because you felt guilty or slow because you wanted to make it last.”

Heat punched through me. I grabbed her wrist—not hard, just enough to stop the descent. “You can’t say shit like that.”

“Why not? It’s true.” She didn’t pull away. Instead she pressed closer until her wet stomach brushed the head of my cock through the fabric. A soft, filthy little sound escaped her. “Feel that? That’s years of pretending I don’t get wet every time you walk into a room. I’m soaked right now, Mark. These bottoms are useless.”

I looked down. The black triangle between her legs was darker, clinging. I could make out the soft outline of her pussy lips, the way the fabric had ridden into her slit. My free hand flexed at my side, dying to yank that string and watch the whole sorry excuse for a swimsuit fall away.

“Sarah—”

“Isn’t here,” she whispered. She rose onto her toes, lips brushing the underside of my jaw. “And I’m right in front of you, aching. You can keep being the good husband. Or you can put your hands on me the way you’ve always wanted and see how loud I get when nobody’s around to hear.”

The tension crackled like a live wire. I could feel her heartbeat against my chest, fast and eager. My thumb stroked once over the inside of her wrist where I still held her, feeling the flutter of her pulse. She shivered. Not from cold.

I let go of her wrist and set both hands on her waist instead. Bare, wet skin. The curve of her hips fit my palms like they’d been measured for it. She made a tiny approving noise and arched, pressing those barely-covered tits against me. One stiff nipple dragged across my shirt. My cock jerked hard enough that she felt it and smiled against my throat.

“That’s it,” she murmured. “Touch me. I won’t tell. Neither will you.”

I slid my hands higher, thumbs brushing the undersides of her breasts, testing the weight of them. They were fuller than they looked, heavy and perfect, the wet triangles doing nothing to hide how hard she was. When I finally cupped them fully she moaned, soft and shameless, head tipping back.

“Fuck, Mark… your hands are so big. I’ve imagined this exactly—”

I pinched one nipple through the fabric, rolling it between thumb and finger, and her words broke into a gasp. Her hips pushed forward, grinding that soaked little bikini bottom against my cock. The friction was filthy, fabric on fabric, heat searing through.

“We can’t do this,” I said even as I yanked the left string of her top. The bow came undone. The triangle fell away, exposing one perfect breast, nipple dark and tight and begging. I bent and sucked it into my mouth without thinking, tongue lashing the peak while she clutched my hair and whimpered.

“Oh god—yes—don’t stop—”

I switched to the other side, teeth grazing, hands sliding down to grip her ass and haul her tighter against me. She wrapped one leg around my hip, opening herself, riding the thick ridge of my cock through our clothes. The water lapped at our calves. Somewhere below us the city kept moving, oblivious. My wife’s stepsister was grinding on me under the open sky, top half-off, moaning my name like a dirty secret.

I pulled back just enough to look at her face—flushed, lips swollen, eyes glassy with want. The remaining string of her top hung loose. One hard tug and she’d be bare to the waist. The bottoms were already useless, rucked to the side enough that I could feel the slick heat of her bare pussy lips kissing the head of my cock through the thin cotton of my sweats.

“Jenna…” My voice was wrecked. “If we keep going I’m going to fuck you right here on this deck. I’m going to bend you over that lounge chair and bury my cock in you until you forget both our names. And tomorrow we’ll have to look Sarah in the eye.”

She reached between us, bold as sin, and wrapped her fingers around my shaft through the fabric, stroking once, twice, thumb circling the wet spot already darkening the front.

“Then stop talking,” she whispered, “and do it.”

The night held its breath. My hands were full of her ass, her hand was full of my cock, and the only thing standing between us and the point of no return was the last fraying thread of loyalty I still owed the woman who wasn’t here. Jenna’s free hand found the remaining string at her neck. She pulled. The top fluttered to the wet tile. Her bare tits pressed against me, nipples dragging, and she looked up at me with pure invitation and zero regret.

I was going to ruin everything.

And I couldn’t bring myself to care.

I groaned low in my throat as her fingers tightened around the thick outline of my cock, but Jenna only laughed—that soft, wicked sound—and shoved me backward with both palms flat on my chest. We toppled together off the edge. Cold water swallowed us in a rush of turquoise light and bubbles. I broke the surface sputtering, sweats plastered to my thighs, and she was already treading water two feet away, bare tits bobbing, dark hair streaming, grinning like the devil who’d just stolen my last scrap of sense.

“Race you to the deep end,” she called, voice bright with challenge, and kicked off hard. I lunged after her on pure instinct. Water churned white between us. My hand snagged her ankle; she twisted free with a shriek of laughter and splashed a glittering arc straight into my face. I caught her around the waist instead, hauling her slick body back against my chest. Her ass nestled perfectly into the cradle of my hips. The head of my cock nudged between those firm cheeks through the soaked cotton, and we both went still for half a second, breathing hard.

“Cheater,” she panted, but she didn’t pull away. She rolled her hips once, deliberate, grinding that tiny black triangle against me while city lights smeared across the glass barrier above us. My hands slid up her wet ribs, thumbs brushing the undersides of her bare breasts again. She shivered and tipped her head back onto my shoulder.

“You’ve been waiting for an excuse to put your hands on me like this,” she said, quieter now, the teasing edge still there but thicker, hungrier. Water lapped at our collarbones. I felt every inch of her spine pressed to my front. “Don’t lie. Not tonight.”

I should have shoved her away. Instead my mouth found the wet curve of her neck. “Years,” I admitted against her skin, the word tasting like surrender. “Every fucking family dinner. Every time you stretched on our living-room floor in those tiny shorts. I told myself it was harmless. Looking. Nothing more. But Christ, Jenna—I’ve jerked off thinking about bending you over the kitchen counter more times than I can count. Wanted to know how wet you’d get if I just… took.”

She turned in the circle of my arms, legs floating up to wrap loose around my waist so we drifted together in the glowing water. Her tits mashed soft and slick against my soaked shirt. Those dark eyes locked on mine, no games left in them—just raw, open want. One hand came up to cup my jaw; the other slid under the waistband of my sweats and wrapped bare around my cock at last. Cool fingers, tight grip, slow stroke from root to tip that made my hips jerk.

“I’ve wanted you since the first Christmas I stayed over,” she whispered. The confession spilled hot against my mouth. “Sixteen months of lying in the guest bed listening to you fuck my stepsister through the wall and hating how wet it made me. Touching myself with three fingers shoved deep, pretending they were yours. Waiting for a night exactly like this—empty pool, Sarah gone, you finally too weak to keep pretending. I’ve been soaked for you since you stepped out of that elevator, Mark. These bottoms are ruined.”

I believed her. The way her thighs trembled around me, the way her nipples scraped my chest with every breath, the filthy little circles her thumb kept drawing over the leaking head of my cock underwater—none of it was performance. Heat punched through the cool water and settled heavy in my gut. My hands dropped to her ass, gripping hard enough to bruise, yanking her tighter so the ridge of my dick split those puffy pussy lips through the soaked scrap of fabric. She moaned, open-mouthed, eyes fluttering.

“We’re really doing this,” I said, voice wrecked. It wasn’t a question. “Crossing every line. Cheating. Right here where anyone could ride that elevator up and see my wife’s stepsister riding my cock in the shallow end.”

“Yes.” No hesitation. She stroked me harder, twisting her wrist just under the waterline so I felt every ridge of her palm. “I want the guilt. I want you ruining me while you still smell like her sheets. I’ve waited too long to keep being good.” Her free hand fisted in my wet hair and she pulled—sharp, demanding—until our mouths crashed together.

The kiss was nothing like the soft ones I shared with Sarah. It was deep and filthy from the first second, tongues sliding, teeth catching her lower lip hard enough to make her whimper into me. She tasted like chlorine and pure hunger. I growled and backed her against the pool wall, water surging around our hips, my cock throbbing in her tight fist while she sucked on my tongue like she wanted to climb inside my skin. Her legs locked higher around my waist. The soaked bikini bottoms had ridden completely aside; I felt the scalding bare slit of her cunt kiss the underside of my shaft, slick and swollen and ready. One shift of my hips and I’d be notched at her entrance.

But I didn’t push in yet. I kissed her harder instead—punishing, claiming—one hand sliding up to pinch and roll her stiff nipple while the other stayed locked on her ass, spreading her open underwater so the cool water teased her clit. She arched and moaned into my mouth, grinding shamelessly, painting my cock with her juices. Every rock of her hips dragged those plump lips along my length. The friction was insane. Wet fabric, bare skin, the forbidden pulse of her heartbeat against mine.

“Fuck, you’re soaked,” I rasped between kisses, biting her bottom lip. “Dripping down my cock already and I haven’t even fingered you.”

“Then stop teasing and put them in me,” she begged against my mouth, voice cracking. Her hand left my dick just long enough to shove at the waistband of my sweats, shoving them down far enough that my cock sprang free, thick and flushed and bobbing between us in the water. She wrapped both hands around it this time, pumping slow and tight, smearing the precome that beaded at the tip. “I want to feel how big you are when you stretch me. Want to know if you’ll fit all the way. God, Mark—I’ve dreamed about this exact cock splitting me open while Sarah’s across the country thinking you’re home alone being loyal.”

Guilt flickered, hot and sharp, but it only made my dick harder in her grip. I thrust into her fists once, twice, water splashing up between our bodies. Then I slid two fingers between her thighs, found her bare entrance, and pushed in deep without warning. She was molten inside—tight, silky, clenching hard around the sudden invasion. Her head fell back against the tile with a broken cry that echoed off the glass. I curled those fingers and rubbed firm circles over the swollen spot that made her thighs shake.

“Like that?” I growled, fucking her slowly with my hand while she stroked me in the same rhythm. “This what you’ve been waiting for? Your stepsister’s husband’s fingers buried in your greedy little cunt on a public rooftop?”

“Yes—oh fuck yes—” She kissed me again, messier this time, all tongue and desperation, hips riding my hand shamelessly. Water slapped louder around us. Her free hand scrabbled at my shoulders, nails digging in. I added a third finger and she keened, walls fluttering, so close already I could feel it. My cock jerked in her grip, aching to replace my fingers, to bury every inch inside that heat until she forgot how to form words.

But I pulled my hand free instead—slick fingers shining under the underwater lights—and brought them to her mouth. She sucked them clean without being asked, eyes locked on mine, tongue swirling like she was tasting the future. When I finally dragged those wet fingers down to yank the side string of her bottoms completely loose, the tiny scrap floated away. She was naked against me now. Completely. Bare pussy grinding along the underside of my cock, clit dragging, both of us shaking with the effort not to slam together and finish it right there against the wall.

Jenna’s breath hitched. She reached between us, notched the fat head of my cock right at her entrance, and held still—just the barest kiss of heat and pressure. Her eyes were black with lust, lips swollen from our kisses, chest heaving.

“Last chance to be good,” she whispered, though we both already knew neither of us was taking it. “Or you slide into me right now and we stop pretending this was ever going to end any other way.”

The night air cooled the water on our shoulders. Somewhere far below, traffic hummed. My wife’s face flickered through my mind one last time—trusting, smiling, a thousand miles away—and then I crushed my mouth back onto Jenna’s, tongue plunging deep as my hands locked on her hips and I started to push.

I pushed in.

Just the head at first, the fat crown stretching her open under the water while she bit my lip and shook. Jenna’s cunt gripped me like a fist—scalding even through the cool pool—and I sank another inch on a ragged groan that vibrated between our mouths. She was tighter than I had any right to hope, walls fluttering and sucking, so wet the water couldn’t wash the slick from my shaft. One more thrust and I would have been buried to the root against the tile, fucking my wife’s stepsister raw in the glowing turquoise like the cheating bastard I already was.

Instead she tore her mouth away, eyes wild. “Not here. Lounge. Now. I want to taste you first.”

We half-climbed, half-fell out of the shallow end, water sheeting off us in sheets that slapped the deck. My sweats tangled around my thighs; I kicked them free and left them in a sodden heap. Jenna’s naked body gleamed under the string lights, tits bouncing, bare pussy shiny with more than pool water as she dragged me by the cock toward the nearest cushioned lounge chair. The fabric was thick, dark, still warm from the day’s sun. City lights smeared across the glass barrier. No one. Just us and the moon and the knowledge that Sarah’s side of the bed was empty three floors down.

Jenna shoved me onto the edge of the chair and dropped straight to her knees on the wet tile. No teasing now. She looked up at me with those wicked dark eyes—pupils blown, lips already parted—and swallowed my cock in one greedy slide. Heat. Wet. Tongue. I barked a curse and fisted her slick hair as she took me deep, throat working, spit already overflowing. She bobbed messily, sloppy and eager, cheeks hollowing, the wet sounds filthy under the open sky. Her free hand cupped my balls, rolling them while she moaned around the thick length stretching her mouth. Every downward glide she locked eyes with me, pure triumph and hunger, like she wanted me to watch my wife’s little stepsister choke herself on the cock that was supposed to stay loyal.

“Fuck—Jenna—your mouth—” I thrust up into it, shallow, watching spit string from her lips to my shaft. She pulled off with a lewd pop, stroked me fast with both hands, and licked a long stripe up the underside before diving back down, gagging herself deliberately so her eyes watered and she still didn’t look away. The guilt hit in waves—Sarah’s perfume still on my pillows, the wedding band glinting on my finger as it tangled in Jenna’s hair—but my hips kept fucking her throat. She wanted the ruin. She sucked harder, tongue swirling the head every time she rose, until I was dripping and throbbing and seconds from flooding her mouth.

I dragged her off by the hair. “Turn around. Over the railing.”

She scrambled up, bent herself over the metal arm of the lounge, ass high, back arched, feet braced wide on the deck. Moonlight painted the wet curve of her spine, the full sway of her tits hanging, the glistening pink of her pussy lips already parted and puffy. I stepped in, gripped her hips hard enough to leave marks, and slammed home in one brutal stroke. She cried out—my name, broken—and the chair scraped an inch across the tile. I didn’t ease up. I fucked her hard and deep from behind, every thrust punching wet sounds into the night, my cock splitting her open while I watched it disappear between those toned cheeks. Her ass jiggled with the force. I slapped one side, then the other, reddening the skin, and she shoved back to meet me, moaning “Mark—fuck me—harder—yes—” like a prayer and a curse.

I leaned over her back, one hand sliding under to pinch and roll her clit while I pounded. “This what you needed? Getting railed on a rooftop by your sister’s husband? Feel how deep I am?” She clenched around me, gushing, dripping down my balls. I gripped both hips and snapped into her faster, the chair creaking, water still dripping from our bodies onto the cushions. Every slap of skin on skin was a betrayal I could taste. She came first like that—sudden, violent, thighs shaking, my name a choked scream she muffled against her forearm while her cunt milked me in rippling waves. I almost followed. Almost. Instead I pulled free, cock glistening and angry, and dropped onto my back on the lounge.

“Climb on. Reverse. I want to watch that ass bounce while you ride the cock you stole.”

Jenna straddled me facing away without hesitation, knees bracketing my hips on the cushions. She reached between her thighs, notched me, and sank down in one long, filthy glide that made us both groan. From this angle I saw everything: the stretch of her pussy lips around my thick base, the way her ass cheeks spread and bounced as she started to ride. She rose and dropped, rose and dropped, hands on my thighs for leverage, fucking herself on me reverse cowgirl with dirty abandon. I gripped her hips and thrust up to meet every descent, watching my cock vanish and reappear shiny with her cream. Her ass jiggled beautifully. Moonlight caught the sheen of sweat and pool water on her back. She looked over her shoulder once, wicked smile flashing, and clenched deliberately on the upstroke just to hear me curse.

“God, look at you taking it,” I rasped, sliding one hand up her spine to fist her wet hair and yank her arch deeper. “Bouncing on your stepsister’s husband’s dick like you own it. Feel how hard you make me? Every time that ass comes down I’m closer to filling you up.”

She rode harder, faster, the wet slap of her cheeks against my hips echoing off the glass. Her tits swayed out of sight but I felt every jolt through her body. Precome and her juices frothed at the base of my cock. I was lost in the visual—her hole stretched pink and greedy, the dimples at the base of her spine, the way she ground down and swirled her hips when she wanted me deeper. Guilt and lust braided tight in my gut. Sarah trusted me. Sarah was closing deals while I watched her stepsister’s perfect ass bounce on my lap under the stars. I slapped that ass again and she moaned louder, slamming down harder, chasing it.

When her thighs started to tremble I sat up, wrapped an arm around her waist, and tumbled us. We rolled. I pinned her under me on the cushions in one smooth move, cock still buried, her legs immediately locking around my waist. Missionary. Face to face. No more hiding. Jenna’s dark eyes were glassy, lips swollen, chest heaving as I started to grind deep and slow—then hard, desperate, the full weight of what we were doing crashing down with every thrust. Her heels dug into my lower back. I kissed her like I was starving, tongues sliding, teeth clashing, swallowing every broken moan of my name while I fucked into her with short, brutal strokes that rubbed her clit on every grind.

“Mark—oh fuck—I’m gonna come again—don’t stop—kiss me—”

I did. Harder. Deeper. Our bodies slapped wet and frantic, the lounge creaking under us, the moonlit pool lapping softly a few feet away like it was keeping our secret. Her walls fluttered and seized. I felt the orgasm rip through her—tight, pulsing, milking—and it dragged mine out of me like a confession. I buried myself to the hilt, grinding through the peak as I spilled inside her in thick, hot pulses, every spurt a fresh betrayal while we kept kissing and rocking and whispering filthy broken things against each other’s mouths. Her legs stayed locked. My hips kept stuttering. The intensity blanked everything except the wet clutch of her cunt and the taste of chlorine and sin on her tongue.

We stayed locked together afterward, breathing like we’d run miles, my cock still twitching inside her as the last aftershocks faded. Sweat cooled on our skin. Somewhere far below a car horn sounded. Jenna’s fingers traced lazy circles on my back, but her eyes had gone thoughtful, almost sharp, when they met mine again.

“That was only the first round,” she whispered against my lips, voice rough from moaning. “Sarah’s flight lands tomorrow night. We’ve got hours left before the sun comes up… and I still haven’t decided how many more times I want you to ruin me.”

My phone, abandoned in the pocket of the discarded sweats by the pool edge, lit up with a soft blue glow. A new message. I didn’t need to look to know whose name would be on the screen.

The blue glow of the phone cut through the afterglow like a knife, but I didn’t reach for it. Jenna’s legs were still locked around me, my cock still half-hard and buried inside her, her cunt giving those soft little flutters that milked the last drops of cum deeper. Sarah’s name was probably on that screen—some sweet good-night text from the hotel in Denver—but the only thing I could feel was the wet heat of her stepsister and the way my wedding band glinted when I brushed a strand of damp hair from Jenna’s cheek.

“Ignore it,” she whispered, rolling her hips in a slow circle that made me hiss. Fresh slick mixed with my load and eased the glide. “Hours, Mark. Remember? I’m not done stealing you.”

I kissed her hard, tasting chlorine and my own sweat on her tongue, and thrust up. The lounge creaked. She moaned into my mouth and pushed me onto my back again, straddling me properly this time—facing me, tits full and heavy as they swayed above my chest. Her hands planted on my shoulders. She lifted until just the head stretched her entrance, then sank down in one long, greedy drop that forced a groan out of both of us.

“Fuck, you’re still so thick,” she panted, grinding her clit against my base. “Feel that? That’s your cum and my pussy making a mess all over your balls. Sarah never gets you like this, does she? Never rides you bare on a rooftop while the whole city watches and doesn’t even know.”

Guilt twisted hot in my gut, but my hands locked on her hips and I drove up into her. Hard. Deep. The wet slap of skin on skin filled the night air. Her tits bounced with every thrust; I leaned up and caught a nipple between my teeth, sucking hard while she rode me like she was punishing us both. Interior monologue wouldn’t shut up—every filthy slap of her ass against my thighs was a confession I could never take back. I’d already come inside her once. I was about to do it again. And I wanted it more than I wanted my marriage intact.

She rode faster, thighs quivering, head thrown back so moonlight painted the arch of her throat. I slid a hand between us and rubbed tight circles over her swollen clit. She clenched instantly, walls fluttering, voice cracking on my name.

“Mark—oh god—right there—don’t you dare stop—”

“Come on my cock again,” I growled against her breast, fucking up into her in short brutal strokes. “Soak me. Let me feel how bad you’ve needed this for years.”

She shattered with a broken cry, cunt seizing around me in hard rhythmic pulses that dragged me right to the edge. I flipped us without pulling out, pinned her wrists above her head on the cushions, and pounded through her orgasm. Her legs clamped my waist. Her mouth found mine in a desperate, open kiss. The lounge scraped another inch across the tile. Water from the pool lapped softly a few feet away like it was laughing at us.

I felt my own climax coil tight at the base of my spine—heavier, thicker than the first. “Jenna—fuck—I’m gonna fill you again—”

“Do it,” she begged, heels digging into my ass, nails raking my back. “Come inside me. Breed your wife’s little stepsister while she’s still gone. I want it dripping out of me when I swim.”

That filthy permission wrecked me. I slammed home one last time and unloaded in long, pulsing jets, grinding deep while her walls milked every drop. We came hard together—shaking, gasping, kissing through it like the world outside the glass barrier had stopped existing. Spurt after thick spurt flooded her. I kept rocking slowly until the last tremor faded, cock twitching inside the hot mess we’d made.

For a long minute we just breathed. Sweat cooled on our skin. Her fingers traced lazy patterns on my shoulders. Then Jenna kissed me softly—slow, almost tender, nothing like the filthy claiming of minutes before. Her lips brushed mine once, twice.

“This is our secret,” she whispered against my mouth. “No one ever knows. And I want it again. Every time Sarah’s gone. Midnights. Afternoons. I don’t care. You bend me over whenever she’s out of town and you fuck me like you just did. Promise me.”

I nodded, still buried inside her, already hardening again at the thought. “Every chance I get.”

She smiled that wicked little smile, kissed me one more time, then carefully lifted off. My spent cock slipped free with a wet sound; a thick trickle of our combined cum immediately ran down her inner thigh. She didn’t wipe it away. She just stretched, gloriously naked under the string lights, and padded barefoot to the pool edge.

I propped myself on my elbows and watched her slip into the glowing turquoise water. She dove under, surfaced sleek and glistening, and began a slow, languid lap. Water sheeted off her bare tits and the curve of her ass each time she turned. My cock twitched against my stomach, already wanting more. I knew—bone-deep, marriage-ending certainty—that I would betray Sarah every single chance I got from now on. Jenna’s body, Jenna’s mouth, Jenna’s secret midnight flings… I was already calculating the next conference, the next girls’ trip, the next empty apartment.

She floated on her back again, smiling up at the sky, cum still slowly washing from between her legs into the chlorine. I sat up fully, reaching for the sodden sweats just to check the time—

The elevator chimed.

Soft. Clear. Final.

The doors slid open with a quiet mechanical sigh. Footsteps sounded on the deck—heels, unhurried, familiar. A voice I knew better than my own cut through the night air, bright with jet-lag surprise and the leftover smile of a successful trip.

“Mark? Baby, I caught an earlier flight—figured I’d surprise you. Why is Jenna’s bikini—oh my God.”