This role-play is performed by adults. Natsuko's son, Kousuke, who was raised single-handedly, has finally decided to get married. However, Kousuke, who had a secret admiration for his mother, was unable to shake off his feelings until the very end... On the night before their wedding, a mother gives her son one last lesson to Kousuke, who is worried about his new life: ``I just want them to be happy...'' Kousuke, who has experienced climax many times from unconditional love, continues to experience intense pleasure as he experiences pleasure for the first time. And the mother and child, who dabble in forbidden pleasure, are caught in a whirlpool of desire...