With her husband away on a long business trip, Mariko lives alone with her adult son Kazuya. She grows fond of his new classmate Atsushi, but the young man, starved of maternal affection after being raised by a single parent, turns that longing into lust and forces her down. His greedy caresses awaken pleasure Mariko has not felt in years. Overwhelmed by the youth and force of a cock unlike her husband's, her body remembers what it is to be a woman, and she can no longer suppress the ache building inside her...