Masaru decided to visit his grandmother Shizuko after his grandfather's death, worried about her as he had been close to her since childhood. Recalling her late husband, Shizuko told Masaru, "When you came to play as a child, we used to sleep together," inviting him into bed. Tempted by her words, Masaru agreed to sleep beside her. But when he woke up in the middle of the night, he found Shizuko sucking his cock. Surprised yet overwhelmed by her loneliness and the pleasure she gave, he couldn't resist and came inside her mouth. The next morning, tormented by guilt, Masaru tried to leave, but Shizuko tearfully begged, "Please, just this once." Shaken by her plea, he finally gave in and had sex with her.