After accidentally catching sight of his daughter-in-law Aoi changing clothes with her big round breasts and nude body, the desire in her father-in-law began to appear. He thought his son was getting married to take care of his family and his aging father, but he did not know that his wife was his sex slave. The times he went to work were also the times when his wretched old father tortured his filial daughter-in-law. Her screams and moans seemed to give him strength, increasing his intense desire. After enduring such humiliation many times, she still just kept quiet, perhaps because she was afraid of her old father, but maybe because she was feeling happy when she was having sex with her lecherous father-in-law. .