I had just turned twenty-two when it happened. My sister Lisa was twenty. We were both home from college for the summer, stuck in the same house we'd grown up in. Mom and Dad were gone for the weekend, and the place felt too quiet, too empty. We'd always been close, but something had shifted since we'd both left for school. The way she looked at me had changed. Longer stares. Lingering touches when she passed me in the hall.
That Friday night we were drinking in the living room. Cheap vodka mixed with soda, music low on the speaker. Lisa wore a thin tank top with no bra and tiny shorts that barely covered her ass. Her tits pressed against the fabric every time she moved. I tried not to stare, but my cock was already half-hard just from sitting next to her on the couch.
"Remember when we used to wrestle as kids?" she said, grinning. Her eyes were glassy from the drinks.
"Yeah," I answered. "You always lost."
She set her glass down and shoved my shoulder. "Try me now."
We started roughhousing. It was supposed to be playful, but it turned fast. Her body pressed against mine, her tits rubbing my chest, her thigh sliding between my legs and brushing my dick. I grabbed her waist to pin her, and she ground back against me on purpose. My cock went fully hard in seconds.
"Fuck, Lisa," I muttered, trying to pull away.
She didn't let me. Her hand slid down and squeezed my erection through my jeans. "You're hard for your sister. That's dirty."
I should have stopped. Instead I yanked her tank top down. Her tits spilled out, nipples already stiff. I sucked one into my mouth while she moaned and rubbed my cock harder. She unzipped me, pulled my dick out, and started stroking it with a tight grip.
"I want you to fuck me," she said, voice low and filthy. "I've been thinking about your cock for months."
We didn't make it to a bedroom. I shoved her shorts and panties down, spread her legs, and pushed two fingers into her pussy. She was soaked. I finger-fucked her fast while she jerked my cock, both of us breathing hard and swearing.
"Put it in me," she begged. "Fuck your sister."
I lined up and slammed into her. She was tight and hot, her cunt gripping every inch. I fucked her hard right there on the couch, her legs wrapped around me, her nails digging into my back. The sound of skin slapping filled the room.
She kept talking dirty the whole time.
"Harder. Fuck me like you mean it. Fill your sister's pussy."
I pulled out, flipped her onto her knees, and took her from behind. Her ass bounced with every thrust. I reached around and rubbed her clit until she came, her cunt pulsing around my cock. Then I unloaded inside her, pumping thick ropes of cum deep while she pushed back against me.
We didn't stop there. We moved to the floor, then her bedroom, then the shower. She sucked my cock until I was hard again, swallowing most of my load and letting the rest drip down her chin. I ate her pussy until she screamed, then fucked her standing against the wall. Every time one of us came we kept going. By morning we were sore, covered in sweat and cum, and still touching each other.
The rest of the weekend was the same. We fucked in every room, on every surface. She rode me on the kitchen table. I bent her over the washing machine. She let me fuck her ass for the first time, moaning that she wanted her brother to own every hole. We didn't talk about stopping. We just kept going until our parents' car pulled into the driveway Sunday night.
After that we snuck around whenever we could. Quickies in the garage, quiet fucks in her room with the door locked, even once in the back seat of my car while our parents were inside. It never felt like enough. The dirtier it got, the more we wanted it. Her pussy belonged to me and my cock belonged to her. We both knew it was wrong, but that only made us fuck harder.
We still do it when we're home together. No one else knows. It's our secret, raw and constant. Every time she looks at me with that hungry smile I know we're going to end up naked again, her begging for her brother's cock and me giving it to her until we're both spent and satisfied.
