That JAV

One day, he stumbled upon a DVD that contained a video of his wife and father having sex. The son was puzzled, but he was fascinated by the video. Why would his father have sex with his wife? The father, who is ill, comes up with the idea of continuing to film his son having sex with his wife until he dies. The father rapes his wife, putting her to sleep with sleeping pills, and films the whole thing. Then, he uses it as a story to further...