I masturbate my juicy pussy while my stepdad showers in my bathroom because theirs needs to be repaired.

The bathroom in my stepdad's room needs repairs, and my stepdad asked me to let him use mine to shower. As I walked by, I saw a huge cock under the towel, and it looked erect. This turned me on so much that I couldn't help but masturbate, hoping he'd hear me and masturbate too. When he came out, he saw me in a thong.