I stumbled upon my stepsister in a compromising position while watching a movie

After a movie, my stepsister and I found ourselves alone in the house. As I watched her from the couch, she caught me and, to my surprise, she didn\'t seem upset. She came over, took out my dick, and started sucking it. It was a wild ride, and when she was done, she let me fuck her right there on the couch.