A married woman who has been married for three years lives with her husband's father. Her busy husband is often away on business trips, and the frustrated wife masturbates without any marital activities, but her father-in-law watches and grins at her. One day, the courier with whom she was having an affair comes and they have sex, but her father-in-law is once again spying on her. Then, the father-in-law asks for his wife's body, using the fact that he witnessed her masturbating and cheating on her. A wife who is threatened by her husband and can't refuse and opens her crotch. Furthermore, she is made to cum many times by her father-in-law, who hates being fucked and fucked at night.