Natsumi can't get enough of her husband's light sex. She is restrained when she looks at the erotic site, fantasizes about herself being squid, and indulges in masturbation by thrusting a thick dildo. One day, her husband's younger brother, Yoshio, will stay at the house, and in front of the young man, Natsumi fantasizes about herself screaming and writhing like a beast while being put to sleep by Yoshio.