The husband sneaked around with his sister-in-law while his wife was pregnant. By chance, while the wife was sleeping, the husband went out and passed by the sister-in-law's room and discovered her masturbating.
The next day, this guy was also sitting in the room watching sex movies and masturbating when his sister-in-law saw the two of them masturbating together just a door away from each other. Even when he saw his sister-in-law embarrassed, he kept putting his penis in front of her face, making her unable to stand it and the two secretly fucked each other from that day on.
