The son and his wife came to stay at the parents' house after a family get-together. The father-in-law is excited as he peeks at his wife naked while she is taking a bath. The devilish wife is excited by the father-in-law's erotic gaze and purposely shows it off, grabbing and playing with the father-in-law's erect penis while the son is sleeping next to her. The two are so excited that they end up having an affair right next to the son.