Alex trudged through the front door, his shirt clinging like a second skin from the brutal August heat and post-game sweat. His legs felt like lead as he gripped the banister, hauling himself upstairs. Mom's voice echoed from the kitchen, sharp on speakerphone about some work deadline. He grunted a reply and kept moving, desperate for a shower to wash away the grime. Before he could reach the bathroom, the screen door slammed. Sophie sauntered in, all golden limbs and swaying hips, still in her volleyball gear—those tiny spandex shorts riding high on her ass and a cropped bra barely containing her D-cups.
She hip-checked him into the wall with a laugh. "Nice game, Alex. Miss another layup, or trip over your own dick again?" Her voice dripped with that signature big-sister sarcasm. Alex scowled, firing back, "We won. And at least I don't serve like a catapult with Parkinson's." Sophie ruffled his hair, unfazed. "Oooh, burn. Still acting like the baby bro even after I went to college." They traded barbs all the way up the stairs, but every time she jogged ahead, his eyes betrayed him, locking onto the hypnotic bounce of her athletic ass.
At the bathroom door, Sophie planted her hands and claimed it. "Shower's mine. Your hair doesn't take two hours." Alex protested, but she arched an eyebrow, lifting her chest in a way that made him look away. "I ran five miles in this heat. Skin's sizzling. Use the hose outside, baby bro." Their bickering hit a wall when Mom called them down. "Hot water heater's busted. Plumber tomorrow. Shower together or no hot water for dinner." Sophie shrugged, unfazed. "No biggie. We've shared space before."
Alex's stomach twisted as they headed back upstairs. Sophie stripped first, tossing her bra and shimmying out of the shorts with zero shame. Naked, she spun like a runway model, her toned body glistening—flat stomach, perky pink nipples, a tiny landing strip above her smooth pussy. "See something you like?" she teased. "Jesus, sis," Alex muttered, turning away. "Try being normal." She laughed, stepping into the shower. "This is normal. Don't be a wuss—it's just skin."
Stripping fast, Alex joined her, his cock already half-hard despite his efforts to hide it. The stall was cramped; their bodies brushed constantly under the spray. Sophie caught him staring and smirked. "Seriously shy? You're such a little prude." He shot back, "At least I'm not a nudist." She handed him body wash. "Scrub my back, gentleman. Arms are dead." His hands slid over her slick skin, lingering on her lower back until she arched and pressed his palm to her ass. "Don't be shy. I know you've stared since puberty."
His fingers gripped the firm globe, feeling muscle under softness, and his cock sprang fully hard. Sophie reached back, squeezing his thigh. "Looks like you're enjoying yourself." "It's just a reflex," he stammered. She spun, trapping him against the tile, her tits pressing to his chest. "Ever touched a girl? Fucked one?" He nodded then shook his head. Her thigh slid against his throbbing cock. "Want to?" she whispered, lips brushing his ear. Before he could answer, she kissed him hard, tongue demanding, then dropped to her knees for a quick, teasing stroke along his length.
Sophie stood, guiding his cock between her legs, rubbing the head against her wet, dripping pussy. "Fuck me, Alex," she ordered, strong legs wrapping around his waist as she jumped up. He thrust inside her tight heat, pinning her to the wall. She moaned, nails digging into his ass. "You're so fucking big. I knew it." Water cascaded over them as he pounded harder, her ass rippling with each slap, her D-cups bouncing against his chest. She was panting, horny, and in control, rocking her hips to take him deeper.
"Harder, little brother," Sophie demanded, rubbing her clit. Her pussy clenched around his cock, dripping with arousal. He felt her cum first, walls spasming and gushing, milking him relentlessly. The sensation pushed him over; he buried deep and came, thick ropes of cum flooding her pussy as they both panted and sweated under the spray. She milked every drop, grinning wickedly. "We’re definitely doing this again—next time even rougher."
After toweling off and a tense dinner where every glance promised more, Sophie leaned close in the hallway. "If you want Mom to hear us next time, fuck me harder." Her wink left him aching for what came next.
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