Son becomes obsessed with his stepmother, Hitomi Enjo, going so far as to spy on her bath times and the couple's intimate moments. While her husband is present, she wears lewd outfits, writhing from toy play, yet clearly aroused by having her anus licked and subjected to aggressive lesbian-style sex. Her depraved acts continuously fuel the son's lust. When the father announces a business trip and leaves the house, the son secretly watches his stepmother masturbating—until he gets caught. Furious at first, she confronts him, but then softens, whispering, "I'll be sweet to you," and proceeds to dominate him: licking his anus while finger-fucking him, moaning filthy titty-fuck talk, jerking his cock, straddling him in a wide-legged cowgirl position, and forcefully extracting creampie after creampie in an incestuous frenzy.