A son who is thrilled when his father remarries and Yui, who is the same age as himself, becomes a mother-in-law. She shows off her stuffy crotch as if to provoke her son and makes an obscene appeal. Her son picks up Yui's man hair that had fallen and tries to masturbate while smelling her in her room. Yui suddenly appears there. Her son was in a hurry to confess that he was fascinated by her Yui's man hair.
