Kouichi, who came to play at Youuke's house, a classmate, starts fucking her on the spot in excitement when he finds out that Youuke's mother, Akari, is masturbating while bathing. Akari, who noticed this, gently chastises the embarrassed Kouichi and proposes an unexpected relationship, saying, "Let's feel good together." Kouichi, who fears damaging his relationship with his best friend, reluctantly accepts Akari's forceful proposal that "If it's just the tip, it's the same as doing nothing," as Akari wants to somehow relieve her frustration because her husband is on a business trip...
