ADN-556 I'm having sex with my stepson.

My husband had a child from a previous marriage. His name was Yuuta, and at first he was a good, obedient boy. But after we started living together, he started skipping school, learned to play around with women, and gradually his behavior became bad... Then, I saw Yuuta masturbating to a photo of me. Could it be my fault that Yuuta had changed...? Just as I was thinking that, Yuuta pushed me down while my husband was sleeping... and we ended up having a physical relationship.