A son who wears a chastity belt to force his mother to abstain from the abstinence of his own

Takuya is her son, peering into the body of her voluptuous mother, Yumi, from behind. His respect for his mother was gradually becoming more distorted, and he couldn't contain his desire to make her own as a woman. "It's a present for your mother." One day, Takuya attacks Yumi and wears a chastity belt on her crotch. "From now on, I'll manage my mother's sexual desires," Yumi is unable to consult with her beloved husband and her growing desires eventually reach her limit...