I ended up living with the daughter of my father's new wife. My stepsister has a strong sexual appetite and goes out drinking every night, coming home in the morning. I'm a shut-in, so I happened to bump into her on my way back from a trip to the convenience store, and she noticed me as I was staring at her panties on the stairs to their apartment. It was early in the morning, and everyone in the family was fast asleep, so she invited me to take a bath, and my hard cock pressed against her big ass, and we both started panting uncontrollably. My stepmother woke up and we were about to get caught, so we continued having sex in my room.