A married woman who has been married for 4 years. She lives with her husband's father. Her busy husband is often away on business trips, and the frustrated wife masturbates without any activity as a couple, but her father-in-law doesn't see the scene. One day, the courier with whom she was having an affair comes and they have sex, but her father-in-law is once again peeping. Then, the father-in-law asks for his wife's voluptuous body, using the fact that he witnessed her masturbating and cheating on her. Her husband threatens to expose her, and she 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 raped at night, and reaches climax.