My first girlfriend... I couldn't muster the courage to face the difficult task of losing my virginity. "Don't you want to have sex with me?" I felt pressured, knowing that she was driving me into a corner, and then my sister, who is a brocon and loves me too much, asked me, "Do you want to practice sex? You're scared, aren't you?" She forcefully kissed me and groped my dick... Her soft breasts were rubbed and I got an instant erection! I let her do it and inserted it raw in a cowgirl position! I couldn't hold back and came inside her... It was supposed to be practice, but I got addicted to having sex with my sister...