Stepmother Satomi and college student Yuichi live together in a house while her husband is stationed overseas. One day, Satomi witnesses her sleeping son's erect penis. Having lived apart from her husband for a long time, she is helplessly drawn to her son's hard, standing cock and finally crosses the line. Satomi devours the hard, throbbing penis. In a house where the husband is absent, their forbidden, lustful life together cannot be stopped.