I was twenty-two and home for the summer when it happened. My sister Emily had just turned nineteen and was back from her first year at college. We had the house to ourselves for a week while our parents were on their anniversary trip.
Emily had always been the quiet one, but something changed that first night. She came out of her room wearing nothing but one of my old T-shirts that barely covered her ass. Her tits pushed against the thin fabric, nipples hard. I couldn't stop staring.
"Fuck, you look good," I said, not even trying to hide it.
She smirked and walked over, pressing her body against mine in the kitchen. "You've been looking at me like that all day. Want to do something about it?"
I grabbed her hips and pulled her closer. My cock was already stiff in my shorts.
"You sure about this? We're family."
"Shut up and fuck me," she whispered, reaching down to squeeze my dick through the fabric. "I've wanted your cock for years."
That was all it took. I spun her around and bent her over the kitchen counter. I yanked the T-shirt up and slapped her bare ass hard. She moaned and spread her legs. Her pussy was already wet, glistening. I dropped my shorts, grabbed my thick cock, and rubbed the head up and down her slit.
"Put it in," she begged. "Fuck your sister."
I slammed into her in one thrust. She was tight and hot, her cunt gripping me like it was made for my dick. I started pounding her right there, the sound of skin slapping skin filling the room. Emily pushed back against every thrust, moaning louder.
"Harder, big brother. Fuck me harder."
I reached around and rubbed her clit while I drove into her. Her juices coated my balls. After a few minutes I pulled out, spun her to face me, and lifted her onto the counter. I shoved back inside and sucked on her tits through the shirt before ripping it off. Her nipples were pink and perfect. I bit one while I fucked her deep.
We moved to the couch next. I laid her down and spread her legs wide, watching my cock disappear into her pussy over and over. She came first, screaming my name, her walls clenching around me. I kept going until I was close, then pulled out and shot thick ropes of cum across her stomach and tits.
That was only the beginning. We spent the whole week naked. Morning blowjobs in the shower, quickies on the stairs, her riding me on the living room floor while we watched porn. She loved when I called her my dirty little sister and told her how good her cunt felt. I loved how she begged for my load every time.
By the end of the week we knew every inch of each other's bodies. Emily could take my cock in her ass by the third day, moaning like a whore while I stretched her. We didn't stop until our parents came home, and even then we snuck around for months after.
Nothing ever felt as raw and filthy as fucking my own sister. It was the best sex either of us ever had.
