We washed up on the beach together, me and my sister Emily, both of us soaked and half-naked after the yacht went down. The storm had hit fast, and the crew never stood a chance. Just the two of us made it to that stretch of sand, her tiny bikini ripped open at the side, my shorts clinging to my cock like a second skin. We were alone, no rescue coming, and the heat hit us hard from day one.
Emily was nineteen, tight body, perky tits, and an ass that bounced when she walked. I was twenty-two and had always jerked off thinking about her. Now there was nothing stopping us. The first night we huddled under palm leaves, her body pressed against mine for warmth. My dick got hard against her thigh. She felt it and didn’t pull away.
“Fuck, Mike, you’re poking me,” she whispered, voice shaky.
I grabbed her hip and pulled her closer. “You feel that? Been wanting to shove this cock in you for years.”
She didn’t slap me. Instead she reached down and squeezed my shaft through the wet fabric. “Then do it. We might die here anyway.”
I ripped what was left of her bikini off and spread her legs. Her pussy was already wet, lips puffy and slick. I shoved two fingers inside her, pumping hard while my thumb rubbed her clit. She moaned loud, hips bucking. “Yeah, finger-fuck your sister’s cunt.”
I yanked my shorts down and lined my thick cock up with her hole. No condom, no pulling out. We both knew what we wanted. I slammed in balls-deep on the first thrust. Her tight walls gripped me like a fist. I fucked her raw right there on the sand, grunting with every stroke while she clawed my back and begged for more.
“Harder, brother. Breed me. Fill my pussy with cum.”
I pounded her until my balls tightened and I unloaded deep, rope after rope of thick spunk flooding her womb. She came hard around my cock, pussy milking every drop. We didn’t stop there. That first load was just the start.
Days blurred into weeks. We built a shelter, found food, but the real survival was the constant fucking. Every morning I woke her by sliding my morning wood into her sloppy, cum-filled cunt from behind.
She’d push back, moaning, “Pump another load in me, Mike. Knock me up so I can have your baby on this island.”
I bred her constantly. Bent over logs, against trees, in the shallow surf. I’d eat her pussy first, tongue-fucking her hole and sucking her clit until she squirted, then flip her over and drive my cock home. No mercy. Deep, rough strokes that made her tits bounce and her ass ripple. I’d hold her legs wide and watch my shaft disappear into her, coated in our mixed juices, then bury myself to the hilt when I came.
“Take it all,” I growled, grinding against her cervix. “I’m gonna put a baby in this belly.”
She loved it. Begged for it. “Impregnate your sister. Make my stomach swell with your kid.”
Her periods stopped after the first month. Her tits got heavier, nipples darker and sensitive. I sucked them while I fucked her, tasting the changes, knowing my seed had taken root. Every time I came inside her now it was with the knowledge that she was already carrying my child. That only made me fuck her harder, longer, filling her again and again so the pregnancy would stick and grow.
We lived like animals. Naked most of the time, bodies always touching. I’d wake in the night, roll on top of her, and slide into her pregnant pussy while she was half-asleep. She’d wrap her legs around me and whisper dirty shit like, “Cum in your knocked-up sister. Give me more.”
By the time her belly started to show, we had a rhythm. Morning fuck, afternoon fuck, night fuck. I’d bend her over, spread her cheeks, and watch my cock stretch her hole while my cum from the last round leaked out around my shaft. Then I’d add another load, pushing it deep so it wouldn’t escape.
We never talked about rescue. We didn’t want it. This island was ours now, and the only thing that mattered was keeping her bred. My sister, my cumdump, the mother of my child. Every thrust, every spurt of hot seed inside her was a claim. Shipwrecked or not, we had everything we needed right between her legs.
