I went out and realized that I had left my wallet at home. I went back and heard screams from the bedroom. My step sister was having a seizure on the bed so I ran to her to help. She seemed irritated and asked what was I doing there. I noticed that she wasn’t wearing any panties. She explained that she is fine and was just having an orgasm. She asked me if I’d want to watch her. Then she started kissing me and rubbing my dick through my jeans. She started sucking my huge dick and very soon we were fucking. I fucked my stepsister hard until we both cum.