Ayaka, who has spent most of her life alone with her husband, who goes on business trips all year round and doesn't come home. Because of this, her son Shinsuke is often spoiled by Ayaka and she worries about his future. At that time, I saw Shinsuke passionately masturbating. As a mother, Ayaka teaches her about sex, but Shinsuke, who is aware that her mother is a woman, cannot bear it and pushes her down. She laments that she did something irreparable, but since that day, Shinsuke has tried to hug Ayaka every now and then...