With her husband away on a long business trip, Marina lives alone with her adult son. She sympathizes with his classmate Koume, who was raised by a single father and longs for maternal affection, and begins treating him with special kindness. Koume exploits her sympathy and forces himself on her. Though unwilling, Marina is reminded of her sexuality as her son's adult classmate caresses her deep inside and pounds her hard. She continues resisting the repeated humiliation, but her body begins craving the pleasure.