Single mother Emi has raised her son alone, cherishing the days as she watches him grow. One day, after her son graduates and decides to live on his own, Emi feels a deep sense of loneliness. Wanting to create lasting memories together, she plans a hot spring trip. During their journey, Emi begins changing into a yukata, and her son offers to help. As he assists her, he suddenly buries his face into his mother's ample breasts and passionately confesses his feelings. Surprised yet longing to retain her allure as a woman, Emi takes her son's cock into her mouth, surrendering to the forbidden pleasure of incest. Their bond deepens as they repeatedly indulge in this taboo relationship, fulfilling each other's desires. A story of intimacy and forbidden passion intertwining between mother and son.