Skip to content I got home with my shirt plastered to my chest, that post-game sweat mixing with the grime and August air until it felt like my pores were leaking cement. I dragged my feet through the front door and could already hear Mom on her phone in the kitchen, barking out some work thing. I considered trying to slink past, but I never got that lucky. The minute my sneaker touched the tile, her voice boomed over the speakerphone.
“Alex, you smell like a gym sock. Please shower before you touch anything.”
I grunted a “yup” and headed for the stairs, using the banister to hoist myself up the first step because my legs were jelly. It wasn’t even a minute before the screen door slammed again and Sophie, my big sister and living, breathing thirst trap, came strutting in. I say strut, but she moved more like she was in a slow-mo TikTok, all long golden limbs and swaying her hips like a pornstar. Today she was still in her volleyball gear, which meant her absolute minimum coverage shorts, so tight and so far up her ass it was like the spandex had been tattooed on. She had a cropped sports bra on, navy blue and probably two sizes too small, squishing her D-cups into a shelf that jiggled every time she moved.
She caught up to me at the stairs and faked a hip check, knocking me into the wall. “Nice game, Alex. You miss another layup, or did you just trip over your own dick again?”
I scowled. “We won. And at least I don’t serve like a catapult with Parkinson’s.”
“Oooh, burn,” she said, ruffling my hair with one hand, like I was still twelve instead of a head taller than her. Even after college she never stopped acting like she ran the place.
We did the normal brother-sister jawing all the way up the stairs, but every time she jogged ahead I got a perfect view of her ass. It was an athletic marvel: round, high, so perfectly globed I’d once heard Mom call it “an injustice to mankind.” Which would have been funny if my brain hadn’t spent the last five years quietly cataloging every bounce, every new tan line, every memory of Sophie in a bikini, sports bra, or anything else revealing. Every time I started feeling normal, she’d show up wearing something like this and the cycle started again.
I was halfway to the bathroom when she cut in front of me and planted both hands on the door. “Shower’s mine,” she said, smirking.
“No way. I called dibs from the second I got home. Your hair takes like two hours anyway.”
She pushed back from the door and put both hands on her hips, the motion lifting her boobs enough that I had to look away or risk getting caught. “I was running five miles in this heat. My skin literally sizzles when I sweat. You can go after me, or you can use the hose outside, baby bro.”
“Stop calling me baby bro,” I muttered, but I was already halfway defeated. If Mom heard us bickering again, she’d assign a ‘random’ punishment, which always ended up being my job to take out the trash or mow the lawn.
Before I could answer, Mom hollered up the stairs. “Both of you, come down here!”
Sophie made a show of rolling her eyes. We tromped back to the kitchen, where Mom stood in front of her laptop, wine glass in hand. She was pointing at us with a face that meant business.
“The hot water heater is acting up again,” Mom said. “Plumber can’t come until tomorrow. You’ll have to take your showers together. Otherwise there won’t be any hot water left for either of you.”
I blinked. “What?”
Sophie didn’t even blink. “No biggie. We shared a bathroom for eighteen years, Alex. Pretty sure we’ll survive.”
“That’s not—“ I started, but Mom cut me off with a look.
“Both of you, just get it done. I need at least one of you to not smell like feet for dinner.”
She turned back to her computer, which was Mom for ‘conversation over.’ I shot Sophie a look, hoping she’d back me up. She just grinned wider and arched an eyebrow.
“Aw, are you scared to see a girl naked, Alex?”
I shot back, “I’m not scared. I just don’t want to see you naked. Like, ever.”
She snorted, and something about the sound made me break into a full body sweat all over again. Sophie never lost. She just circled her prey, waited for a sign of weakness, and then pounced.
We slouched our way back upstairs, Sophie swishing her hips so dramatically I thought she might actually dislocate one just to make a point. She ducked into the bathroom, then immediately popped her head out.
“Come on,” she said, smirking. “Or do you need an engraved invitation?”
I considered bolting for my room and waiting her out, but my brain was doing that horny panic spiral where every possible scenario ended with me getting caught jerking off to my own sister. So I walked in, keeping my eyes glued to the faded tile. I caught a glimpse of her tossing her sports bra in the hamper, then she shimmied the shorts down her hips and kicked them off like she was auditioning for a TikTok thirst trap challenge.
She was naked, and I mean, fully, absolutely, no-joke naked. Not even a towel or sports bra for coverage. I looked up, instantly regretted it, then looked again because there was no way not to. Sophie had the kind of body that made you forget your own name: long, tan limbs; toned arms; a stomach flat and hard enough to bounce quarters off. Her tits were huge and perfect, perky even without a bra, her nipples a bright bubblegum pink. She had a tiny landing strip above her pussy, otherwise totally smooth.
She caught me staring and just laughed, spinning around like a model on a runway. “See something you like?”
“Jesus, sis,” I said, turning away fast enough to pop my neck. “Can you at least try to be a little normal?”
She shrugged, unbothered. “This is normal. Maybe if you hit the gym more, you wouldn’t be so self-conscious.”
She turned on the shower and stepped in without waiting for me, water hissing over the curtain rod and her body. I lingered at the door, waiting for some miracle to get me out of this, but all I got was the sound of her humming while she shampooed her hair.
“Don’t be a wuss, Alex. It’s just skin.”
I stripped fast, not wanting to give her any more ammo. My dick was already halfway to standing salute, which was not ideal, but the only thing worse than getting a boner in the shower with your sister was her knowing you were trying not to. I yanked open the curtain.
Sophie was facing away from me, her ass the star of the show. The water made it glisten, beads rolling down her back, pooling in the curve before running down her legs. She looked over her shoulder and grinned. “Crowded in here, huh?”
I grunted and tried to keep my distance, which was basically impossible. The stall was made for one, and our bodies kept knocking into each other every time we moved. I turned so she couldn’t see my dick, but she saw right through it.
“Are you seriously shy?” she said, laughing. “You’re such a little prude.”
I muttered, “At least I’m not a nudist.”
She ignored that and handed me the body wash. “My arms are dead. Be a gentleman and scrub my back?”
I paused, but she wiggled her shoulders and the movement sent her tits bouncing sideways, her hips swaying enough that I almost forgot what air was. I squeezed a blob of soap into my palm, then started rubbing her back, fingers slipping over slick, warm skin. I’d seen her in a bikini a thousand times, but this was different: every line, every muscle, every mole and freckle, right there for me to touch. I caught myself lingering on her shoulder blades, then her lower back, and when she bent forward, my hand slipped lower.
She arched her back and looked over her shoulder, eyes bright. “Getting a little handsy, Alex?”
“Just trying to get all the sand off,” I lied, voice way too high.
She laughed, then reached behind and smacked my hand onto her ass. “Don’t be shy. I know you’ve been staring at it since you hit puberty.”
I jerked my hand away, but not before she pressed it deeper, making me grab a handful of her cheek. It was soft, but underneath the give was muscle like a coiled spring. I felt my dick go from half to full mast in one heartbeat.
She reached down and squeezed my thigh. “Looks like you’re enjoying yourself.”
“That’s not … it’s just a reflex.”
She spun around, trapping me between her and the cold tile. We were so close my dick almost brushed her stomach. She looked down, then back up at my face, smirking like the devil.
“That’s actually kind of impressive, Alex,” she said. “Have you been hiding that from me all this time?”
I didn’t know what to say. I tried to cover myself, but she grabbed my wrists and pinned them to my sides, leaning in so her tits squashed against my chest. Her breath was hot in my ear.
“You ever touched a girl before?”
I nodded, barely able to talk. “Yeah, obviously.”
She raised an eyebrow. “You ever fuck one?”
I shook my head. My face was on fire. She pressed even closer, and her thigh slid between my legs, right up against my cock. The contact was scorching hot, and I couldn’t help but twitch against her.
“Want to?” she whispered, lips brushing my ear.
Every cell in my body was screaming yes, but my mouth wouldn’t work. She didn’t wait for an answer. She pressed up, her hand snaking around my back and her nails digging into my skin, pulling me into her. Her tits slid up my chest and her lips found mine, soft and sweet, tongue forcing its way between my lips. I let out a low noise, somewhere between a gasp and a moan.
The next thing I knew, she was sliding down my body, fingers running over my chest and abs, then wrapping around my cock. She stroked me, water streaming between us. It felt way better than anything I’d done alone. She looked up at me, eyes half-lidded and hungry.
“You have no idea how long I’ve wanted to see you lose it,” she said, voice barely above the spray.
She pumped her hand faster, her other hand cradling my balls, rolling them gently. I groaned, unable to stop myself, and she giggled, the sound echoing off the tiles. She stood up, pressed her body to mine, and kissed me again, her tongue swirling against mine.
I couldn’t take it anymore. I grabbed her hips and spun her so her back hit the tile wall, and she laughed, throwing her head back. Her hands found my cock again and guided it between her legs, rubbing the tip against her pussy. She was already wet, and not just from the shower. I could feel the heat of her, the softness of her folds, as she nudged the head of my cock between them.
“Fuck me, Alex,” she whispered. “Do it.”
She jumped up and wrapped her toned legs around my waist. I caught her easily, pressing her back firmly against the cold tile as the hot water continued raining down on us. I lined up and pushed forward, and she bit her lip, eyes wide and locked on mine. The sensation was insane, hot, tight, slippery and most importantly, taboo. My whole body shuddered, and I had to bite my cheek to keep from moaning like a porn star. I went slow at first, afraid I’d finish too fast and humiliate myself, but she just rocked her hips back, taking more of me inside. I couldn’t believe it. I was fucking my sister … finally.
“You’re so fucking big,” she hissed, nails digging into my ass. “I knew you’d be big.”
I groaned and thrust deeper, burying myself to the hilt inside my sister’s tight, scorching pussy. The water beat down on us as I pinned her against the tile wall, her thick ass cheeks spread around my cock. Sophie’s legs wrapped around my waist, heels digging into my lower back, pulling me even closer.
“Fuck… Alex,” she moaned, her voice husky and dripping with lust. Her massive D-cup tits bounced heavily between us, pink nipples rock-hard and begging for attention. I leaned down and sucked one into my mouth, tongue swirling as I started thrusting harder.
The sound of wet skin slapping wet skin filled the shower. Every powerful stroke made her perfect tits jiggle and her round ass ripple against the wall. Her pussy was silky, hot and gripping me perfectly. Despite the hot water, I could feel every inch of her slick walls fluttering around my cock as I drove into her again and again.
Sophie’s head fell back against the tile, golden blonde hair plastered to her skin, mouth open in a constant moan. “Yes… right there, little brother. Fuck me harder!”
I lost all control. I grabbed her thick ass with both hands and pounded into her, the wet slap-slap-slap echoing louder than the running water. Her juices coated my balls and ran down her thighs, mixing with the shower spray. Every deep thrust made her big tits bounce wildly against my chest.
She reached between us and rubbed her clit furiously, her breath coming in sharp gasps. “I’m gonna cum… don’t you dare stop. Fill your big sister up!”
Her words pushed me over the edge. I fucked her with raw, animalistic need, slamming my cock into her dripping pussy as deep as I could go. Sophie’s body suddenly tensed, her walls clamping down around me like a fist. She cried out, shaking violently as her orgasm ripped through her. Her pussy spasmed and gushed around my cock, milking me relentlessly.
That was it. I buried my face in her neck and thrust as deep as possible. My balls tightened and I exploded. Thick, powerful ropes of cum blasted straight into her vagina, pulse after pulse of hot seed flooding her. I kept thrusting through it, grinding deep, pumping every last drop into her clenching pussy. The feeling was mind-blowing: warm, wet and insanely taboo.
Sophie moaned loudly as she felt me filling her, her nails raking down my back. “Fuck yes… give it to me. I want all of it.”
We stayed locked together, my cock still buried deep inside her as the last spurts drained into her. Cum mixed with her juices and the shower water, leaking out around my shaft and running down her thighs. I could feel her pussy still fluttering around me, greedily taking everything I gave her.
For a long moment, the only sounds were our heavy breathing and the water still raining down on us. Sophie finally lifted her head, her blue eyes glassy with satisfaction. She gave me a wicked, breathless smile and kissed me slowly, her tongue teasing mine.
“Goddamn, baby brother…” she purred against my lips. “You just came so much inside me.”
I stayed buried in her, not wanting to pull out yet. She gently rocked her hips, milking the last drops from me with a soft, satisfied moan.
“We’re definitely doing this again,” she whispered, nipping at my bottom lip. “Next time I want it even rougher.”
I let go of her. “Do you think Mom heard us?”
“Hardly … if you want our mommy to hear us, you have to fuck me harder,” she said with a coquettish wink, making me roll my eyes.
*****
After the shower, we cleaned up, toweling off and pretending nothing happened when we went down for dinner. But every time Sophie looked at me, she had that look … the one that promised this was just the beginning.
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