Late at night, the son sneaks into his stepmother's room to secretly watch her urinate. As she sleeps, he strokes her back and presses his face against her buttocks while masturbating. Suddenly, the stepmother awakens and murmurs to her son, "You're my son, yet also a man—being a man and a woman is complicated." Without regard for his inner turmoil, she allows him to experience her pissing while sitting on his face, and he accepts her act. From that moment, their taboo relationship grows even deeper.