The hot tub bubbled under the night sky as I watched my sister slide in across from me.
We were both adults now, home for the weekend with the parents asleep inside. She wore a tiny bikini that barely covered her tits, and the water jets made everything feel slippery and charged.
"Fuck, this feels good after that long drive," she said, leaning back. Her nipples poked hard against the wet fabric. I couldn't look away. My cock was already half hard under my shorts.
She caught me staring. "You like what you see, big brother?" Her voice was low and teasing. She shifted, spreading her legs a little so the bubbles hit right between them. "I've been thinking about this tub all week. Just us."
I moved closer, the water warm around my waist. "Don't start shit you can't finish," I warned, but my hand was already on her thigh under the water. Smooth skin, then higher, fingers brushing the edge of her bikini bottom.
She grabbed my wrist and pushed my hand right onto her pussy. Even through the fabric it was hot and swollen. "Who said anything about finishing early?" She ground against my palm, eyes locked on mine. "Finger me. Right here."
I yanked the bikini aside and shoved two fingers straight into her cunt. She was tight and slick, clenching immediately. She moaned low, biting her lip as I pumped them deep, thumb rubbing her clit in hard circles. Water splashed around us.
"More," she hissed. She reached under the water and freed my cock, wrapping her hand around the thick shaft. Her strokes were rough and fast, jerking me while I fingered her harder. "God, your dick is so fucking big. I want it in me."
I pulled her onto my lap facing me. The bikini top came off with one tug. Her tits bounced free and I sucked a nipple hard while she reached down and lined my cock up with her entrance. She sank down in one smooth motion, taking every inch into her wet pussy.
"Fuck yes," she groaned, riding me slow at first then faster. The tub jets pulsed against our sides as she bounced, water sloshing over the edge. Her cunt gripped me like a fist, hot and slippery. I grabbed her ass and thrust up to meet her, balls slapping against her.
She leaned in, whispering dirty in my ear. "Pound your sister's pussy, brother. Fill me up." I flipped her around, bending her over the side of the tub. Her ass was up, pussy exposed. I drove back in from behind, pounding deep and hard. Each thrust made her moan louder. One hand reached around to rub her clit while the other held her hip.
"Don't stop," she begged, pushing back to take me deeper. Her tits swung with every slam. I felt her start to come, cunt pulsing and squeezing around my cock. She cried out, body shaking, juices mixing with the bubbling water.
I wasn't done. I pulled out, spun her, and shoved my cock between her lips. She sucked greedily, tongue swirling the head, taking me to the back of her throat. I fucked her mouth while she fingered herself again. When I was close I pulled back and stroked myself, shooting thick ropes across her tits and face. She licked what she could reach, eyes half-lidded with lust.
We stayed in the tub a while longer, touching and teasing until I was hard again. This time she rode me reverse, leaning forward so I could watch my cock disappear into her over and over. We came together, her pussy milking me dry as I flooded her inside.
By the time we climbed out, the water had cooled and the sky was lighter. She kissed me hard before sneaking back to her room. "Same time tomorrow night," she whispered. "Next round in the tub."
