Kasumi lives with her husband and son. Her son is a repeat student and her husband is constantly telling him to study. One night, while they are having sex, her husband loses his erection. Feeling helpless, Kasumi starts masturbating in the kitchen. Her son happens to be passing by and asks, "Aren't you satisfied with sex with Dad?" as he thrusts his rock hard cock into her. From that day on, she is forced to have sex with her son many times. While desperately trying to hide from her husband...