I held as still as possible letting her do all the work, I wanted her to practice because there was no way in hell I would just fuck her one time. I m...ved my hands down to her hips and told her I would help give her tips. As she pushed up I pulled her hips slightly towards me, as she went back down I pushed her away. Then she began to ride me like this, moving her hips forward and backward as she went up and down. I then felt her push herself down on me completely and start to move her hips in. She didn't wait for my answer, she sat up a little and pulled my boxers down. I returned the favor and slid her panties down her long legs and threw them to the floor. She sat up and pressed her warm lips to mine. "Let me do it." She said, pushing me over. I looked up at her ceiling as she slid her hot tongue over the tip of my penis. She licked from the bottom of my shaft to the head while caressing my balls. I held back loud moans but couldn't help but thrusting into her mouth. She gagged. I didn't know what todo. I didn't want to tell him I was a boy dressed like my sister. I wasreally freaked out. Just then the phone rang and it was my sister. Shetold me that she was going to be late and to tell her date that she wouldreschedule for another night. I told her that he was already here and sowas she. She got really confused. I told her that I put on her clothesand when I answered the door her date thought I was her. At first she wasreally mad at me, then when I told her why I did. “Um… Yah, I’m sorry but… you are so sexy,” Adam said. I felt really good and proud on my beauty that, this young guy was fantasizing me always, but he was my best friend’s son, so it was a bit awkward too. “So its like you see me in your house having coffee sitting next to your mom, then you look at my cleavage or may be legs, and then go to your room and masturbate?” I said mentioning that, I had noticed him looking at my legs too. “Not all the time, but most of the time…” Adam was not hiding.