Kyouko, a mother whose husband is away on a trip, agreed to go on a date with her friend Touka and Touka’s lover, not knowing that he is her younger brother. During the date, Kyouko felt uncomfortable, especially when Touka left her alone with Yoshiya. When trying to go back home, Yoshiya took her to a room and showed her his erect penis, to Kyouko’s surprise.
