Asking my stepdaughter to rub Daddy's feet

I asked my 18-year-old stepdaughter to rub my feet. Lil did I know she was feeling experimental, she felt that my cock was hard in bulging, and next thing you know, she went for it and started rubbing and stroking it. I could not resist, but let her do it. Next thing you know I was fucking my stepdaughter! She just turned 18 a couple weeks ago. She really got sick and filled out everywhere. It counts, I don't know how she is so thick and curvy. Her ass is so big and her tits are perfect!