While cleaning the bath, Junko accidentally falls into the bathtub fully clothed. In a panic, she is rescued by her stepson, Tohru, but when he sees Junko's wet, ample breasts, he becomes aroused and approaches her. Junko is surprised, but her arousal from Tohru's fingering brings her to orgasm. Afterwards, Tohru takes advantage of the fact that her father is not around and makes advances on Junko...