GVG-781 - The son-in-law's trap targeting his mother-in-law's obscene breasts

Eri, a mother-in-law suffering from a sexless marriage, receives a mysterious package containing erotic lingerie and a vibrator. Believing it to be a free trial, she innocently uses them, unaware that it's a trap set by her son-in-law, Hideki, who has been lusting after her massive breasts. Hideki, who has been filming the entire scene, finally makes his move!