Yuichi, a college student and a mother-in-law Satomi, who lives together in a house where her husband is assigned overseas. One day Satomi witnessed her son's erection while she was sleeping. After her long separation from her husband, she finally crosses her line as she is helplessly drawn into her hard, erect penis of her son. Satomi devours her hard, pulsating penis. I can't stop the naughty lustful life alone in the house where her husband is absent.