Hirokazu visits his classmate Yosuke's house and accidentally catches Yosuke's mother, Akari, while she's bathing. Overcome with excitement, he starts jerking off on the spot. Caught in the act, he is gently scolded by the embarrassed Akari, who then provocatively suggests they pleasure each other. Hirokazu refuses, not wanting to damage his friendship with Yosuke, but Akari—frustrated from her husband's constant business trips—persuades him by insisting that just the tip is practically harmless. Eventually, he reluctantly gives in.