My stepsister's surprise at my lack of interest leads to an unforgettable encounter

I was in my room when my stepsister came in, and I could tell right away that she was surprised by my lack of interest in her. She's always been a bit of a wild one, but I just can't get into it with her. She's not my type, you see. Anyway, I decided to have some fun and see if I could get her to do something crazy. I told her I wanted to fuck her, and at first, she was taken aback. But then, after a bit of persuasion, she agreed. What happened next was nothing short of mind-blowing. She's got a big ass, and it was amazing to watch her get fucked. It was a bit taboo, what we were doing, but it was worth it. She's not my sister, but she sure did act like one. The way she squirmed and moaned as I pushed my dick into her ass was enough to make anyone cum. And when she finally squirted all over my cock, I knew I had done the right thing.