Amateur step-sister challenges me to last longer than 2 minutes

I've been trying to last longer than two minutes with my step-sister for a while now. Every time we're alone, I try to keep it up, but she's always too busy to pay any attention to me. But the other day, after a long talk, she finally decided to give me a chance. She challenged me to last longer than two minutes in her mouth. It was a tough one, but I managed to do it. As a reward, she let me take her to the dorm room and we had a wild sex session. She was a total amateur, but she knew how to ride my cock like a pro. We started off with a missionary position, but then she wanted to try riding me while I was lying on my stomach. That was when things really got crazy. She was a hot, sexy girl with a body that was just begging to be fucked. I took her from every angle, including doggystyle and sideways, before I finally came all over her fat, curvy body.