Big Butt Punishment.

Tomiko, a housewife, composes Tanka as a hobby. Tomiko's husband, Nobuo, who thought she was submissive, is surprised to find that Tomiko's tanka is radical. Nobuo takes the contents of her tanka seriously and suspects that Tomiko is cheating on her, so he ties her up with a belt and punishes her, but he becomes lustful at the sight of her tied up...