In order to help her step-son gain confidence after being dumped by a girl, Mao decides to have sex with her in one go. Mao has the special belief that if she wears a condom, she won't get into sex while she has sex, and although she is in law, she can't open her legs and invites her in with her son, a parent and child... When my son secretly removes the condom, his attitude suddenly changes...