Hitomi Enjo, a married woman, suffers a head injury after a fall and suddenly transforms into an aggressive, domineering personality. Her husband is at a loss, while her son cowers in fear of her tyrannical behavior—slapped without reason and forced to give oral sex against his will. Despite the chaos, he obeys out of filial duty, and the acts grow increasingly intense. Bound tightly with ropes, he becomes her submissive plaything in a full-blown BDSM session. Used as pleasure for his mother's desires, he's ridden in the cowgirl position as she grinds her pussy on his erect cock. As her son's face twists between pleasure and guilt, Hitomi relentlessly rides him until she squeezes out every drop of his cum.