My step Sis, Jenna Star, needed help in her math class so she asked me for help. She was always so rude to me so I asked what I even got out of it. She assured me every girl would want me in college if I helped her. She finally decided to help and I didn’t know she meant turning me into a jock. She took off my glasses, clothes, and showed me how to fuck. I couldn’t believe what was happening, I mean she was my step Sis. I kinda had an idea from all the hentai I watched and gave it a shot. I fucked my step Sis so good that I made her cum on my nerdy cock. Finally, I came all over her big tits and covered her.