All performers are adults in a mother-son role-play scenario. Fumiko, a woman in her fifties treated like a servant by her husband, develops forbidden feelings for the adult son who sympathizes with her. After his engagement, she spends her lonely days clutching his underwear while masturbating. On the day he is due to move in with his fiancée, Fumiko can no longer suppress her desire and makes her move on the son she loves.