My step daughter walked in on me jacking off and instead of freaking out she wanted to take a closer look and touch it. She said they were just learning about reproduction in school but they really never told you anything. I let her and she said that if mom (my wife) caught me "doing that" in the living room while we were home together she'd freak out. I said I'd keep it a secret if she would. When her curiosity was satisfied she pulled down her pants showing me her slightly hairy pussy and said that we were even now.

A few days later when her mom went out again she asked me if she could watch it get hard. I said it would be easier if she took off her top. She did and I pulled down my pants. I let her touch it and I got hard right away, faster and harder than I do with her mom. She asked me all these questions like Does it hurt when it gets hard and tight like that, and she wanted to know how long it would take me to cum again once I did the first time. I said I wasn't sure and she asked if I wanted to find out.

She watched me jack off and cum. I used her top to clean myself up then she started touching me and I got hard in a few minutes. She was pulling and squeezing my dick for at least 20 minutes before I came again. I asked her how many times she comes when she plays with herself and she said she didn't know if she ever came like that. I told her I could make her cum and she said just don't get her pregnant. I said I would use my tongue. She pulled off her pants and I ate her out. I could feel her cum and when I stopped she wanted to cuddle and not let go.

We started having our sexual relationship that way and it developed into a heavy sexual relationship behind her moms back. Her mom never found out but we broke up a couple years later. I still "date" my step daughter and my ex-wife hates for for it. She suspects we started back when I was married to her but she has no proof, and since her daughter is legal there is nothing she can do.