Mara, who is warped even when she is old, will change the fate of a harmonious family. Jun lives with her husband and her elderly father-in-law. While taking care of my father-in-law one day, my father-in-law's thing gets an erection. Gentle Jun performs compassionate sexual processing for his father-in-law, who has an erection unintentionally even though his body is inconvenient. Jun, who had been out of touch with her husband for a long time, noticed that her crotch was wet and her father-in-law's thing was nasty. The two escalate their unfaithful acts in the conflict of family love.