Eriko has been aware of Daisuke, her son's friend, as a man for a while now. One day, the feelings that had been building up can no longer be contained. Eriko changes into her usual flashy underwear, which she wears when the moment calls, and finally succeeds in seducing Daisuke. She starts off as a warm-up... and milks his long-desired semen with some lewd oral sex, but Daisuke feels awkward and runs out of the house. The next day, Daisuke visits the Sakai family again to retrieve his forgotten cell phone. Eriko then puts on even more stimulating and seductive lingerie and waits for Daisuke...