The mother-in-law's disillusionment is discovered by her son-in-law, who finds her masturbating, who in turn finds her committing adultery. Her son-in-law demanded possession of her body for a variety of reasons, and she could not refuse as he did whatever he wanted, climaxing again and again. "I don't deserve to be a mother," she whined, climaxing again and again under the huge cock of her daughter's husband, but she eventually succumbed to the unbearable pleasure. She begins to crave it herself. This is the fourth episode of an immoral erotic drama.