Rena is a married woman who lives with her son while her husband is away on a business trip. One day, her son's friend, who came to stay with her to write a report, witnesses her masturbating. When she pretends to be sick and the two of them are left alone, Rena is raped. Even though she was raped... her body responds to a long-forgotten pleasure, and she becomes intoxicated by the orgasm that comes. Her friends' desires run wild, and they caress her right next to her son, and she eventually becomes immersed in their affairs...