This role-play is performed by adults. My husband had a stepchild. His name was Yuta-kun, and at first he was an obedient and good boy. However, after they started living together, he started missing school a lot, started playing around with girls, and his behavior gradually worsened... One day, Yuta saw a photo of me masturbating. Maybe it's my fault that Yuta-kun has changed...? Just as I was thinking that, Yuta pushed me down while my husband was asleep... and we started having a physical relationship.