OGPP-019 - Father-in-law, it's itching so much... My daughter-in-law's secret seduction

A couple decides to live with the husband's elderly father. However, the father-in-law becomes obsessed with his beautiful daughter-in-law, Kaori, constantly peeping at her. One day, after watching his son and Kaori, he catches her masturbating beside her sleeping husband, clearly unsatisfied. Realizing she isn't getting enough from his son, the father-in-law decides to pay her a visit the next day.