Imaoka and Yokoyama are being tutored by their friend's wife, Ayumi, in order to get a license as an administrative scrivener. Perhaps because she is a friend's wife, Imaoka is seduced by Ayumi's erotic pheromone. Reaching his limit, Imaoka begs Ayumi, "If sex isn't okay, at least give me a blowjob!" and she gives him a blowjob. Later, when Yokoyama finds out about this and is unable to concentrate on his studies, Ayumi gives him an erotic lesson.