I ended up staying home alone with my father's new wife's daughter. I was looking at my stepsister's sexy body while she was doing stretching exercises in tight tights when I was found and she asked me to give her an oil massage. It was my first time to touch a woman's body and my dick was hard as a rock. My cock was digging into her tights and she was panting with excitement and I could feel her slit getting wet. She massaged my dick and took it in her mouth and I couldn't hold it in any longer. We started having sex before the family got home.