I wanted my little brother's first time to be mine. Ever since we were little, I couldn't help but find my little brother cute, chasing after me and shouting "Big sister! Big sister!". My sister loves her little brother so much that she even gets jealous of his favorite AV actress and interrupts his masturbation many times. During summer vacation in college, I had a fight with my boyfriend and had nothing to do, so I went back to my parents' house... Oh, my little brother has a girlfriend!? But when I asked him about his troubles, I found out that he was still a virgin. Apparently he hadn't even kissed her. He didn't know how to create the right atmosphere. So, I wanted to take his virginity... "I'll be your practice partner," I said, as if for my little brother's sake, but I actually wanted his virginity. "It's hard to cum if you use a condom, so it's okay to do it raw." I wanted to give him a first experience he would never forget. And even though we're brother and sister, we even came inside each other... but it felt great. My little brother was climaxing inside my vagina... He looked so happy... I became a 'woman' that my little brother would never forget.