Fumiko has a relationship with her only son, Katsu. In order to hide it from her husband, she was meticulously interacting with Katsu, but adolescent Katsu becomes obsessed with the pleasure of sex and becomes bold. Fumiko isn't worried about the situation where it's okay for her husband to find out at any time. However, while Fumiko's body continued to be embraced, she could not suppress her libido. Even today, the moment the husband went out, the two exchanged a hot kiss ...