I still remember the heat of that summer night like it was yesterday. We were both eighteen, home alone for the weekend while our parents were away, and the house felt too quiet, too charged. I had always been close to my brother, but lately the way he looked at me had changed. His eyes lingered too long on my legs when I wore shorts, and I caught myself staring at the way his shirt stretched over his chest. We had never talked about it until that evening on the couch.
We started with a movie, but neither of us was watching. The tension had been building for months. I finally turned to him and said it straight out. "Do you ever think about us doing something we shouldn't?"
His face flushed, but he didn't look away. "Every fucking day," he admitted, voice low and rough. "I jerk off thinking about you, about how your body would feel under mine."
Hearing him say it out loud made my pussy throb. I shifted closer, my bare thigh pressing against his. "Show me," I whispered. "I want to see how much you want me."
He pulled his cock out right there. It was thick and already hard, the head shiny with precum. I wrapped my hand around it, feeling the heat and the way it pulsed in my grip. He groaned and reached between my legs, sliding his fingers under my panties to find me wet and ready. "Fuck, you're soaked," he muttered, rubbing my clit in slow circles.
We didn't rush. I stroked him while he fingered me, both of us breathing hard and watching each other's faces. When I couldn't take it anymore I climbed onto his lap. "I want you inside me," I told him. "First time. Right now."
He held my hips and guided his cock to my entrance. The stretch burned at first, but it felt so good as I sank down inch by inch. My brother was filling me up, and the wrongness of it only made me wetter. We moved together slowly at first, his hands on my ass, my tits pressed against his chest. Every thrust hit deep, and I moaned his name like a dirty secret.
"Harder," I begged. "Fuck your sister harder."
He flipped me onto my back on the couch and drove into me, skin slapping, sweat mixing. I came first, clenching around his cock, and he followed right after, pumping hot cum deep inside me. We stayed locked together afterward, breathing heavy, knowing this was only the beginning.
Later we moved to my bed. He ate my pussy until I was shaking, then fucked me again from behind while I pushed back against him. We talked dirty the whole time, saying all the things we had kept hidden. By morning we had used every room, every position we could think of, and we both knew we were never going back to the way things were before. It was ours now, raw and real and addictive.
