When her son's hand that was rubbing her shoulder touched her nipple, Chisato reflexively let out a nasty moan. It was the moment when the desire of a woman who had sealed to support a family of one mother and one child woke up. The backlash that she had suppressed for a long time was large, and Chisato's body was so sensitive that she could just by touching her nipples. Chisato, who can no longer control her desires, crosses the forbidden line with her son that night, and the next morning she exposes a potch to her chest and goes to work without a bra.