My first girlfriend... Facing the daunting challenge of losing my virginity, I couldn't muster up the courage. "Don't you want to have sex with me?" As I felt the pressure of being backed into a corner, my sister, who has a brother complex and loves me way too much, said, "Want to practice sex? You're scared, aren't you?" She gave me a forceful kiss and started groping my cock while I was hesitating... I got an instant erection from rubbing her fluffy tits! Then, she just let me raw insert into her in cowgirl position!? I couldn't hold back and exploded with a creampie... It was supposed to be just practice, but I've become completely addicted to fucking my sister...