Crushed by the pressure of her son's upcoming exams, a mother reaches her breaking point at home after work. Hiding in the bathroom, she begins masturbating alone, her frustration and anxiety toward her son growing stronger until she can no longer suppress her moans. Hearing her sounds excites her son beyond control, making studying impossible. Overcome by urges he doesn't understand, he suddenly lunges at his mother. In a single moment of tension and arousal, their relationship is irrevocably shaken.