Yukako's son Takashi had failed his college entrance exams and was forced to repeat the year. One night, Yukako brought a late-night snack to his room while he was studying. As she entered, she noticed a suspicious book sticking out from under his desk—it was an adult magazine featuring mature women. Concerned that her son was becoming interested in such material, Yukako decided to take matters into her own hands. She stripped naked in front of him, masturbated to demonstrate, and then forced Takashi to masturbate as well. Her actions were a complex mix of maternal care and harsh discipline, driven by a mother's desire to guide her son through adolescence.