Hikari, a dorm mother at a certain technical university, has a tomboyish personality and supports the students with strictness but love. Since technical university students are required to be dexterous with their hands, Hikari has been using her own nipples as a practice dummy as a 'part of practical preparation'... The perverted dorm mother, who cannot be satisfied by her husband, releases her sexual desires while having her large, grown nipples played with!