After retiring, he spends his days in agony, but he has a secret pleasure... That pleasure is peeping into the "nightly activities" of his son and his wife, who are now of childbearing age. His son's wife, who is serious and pretty, is lewd and passionate in the bedroom as she rides him with her peach-buttocks... While watching her diligently do the housework during the day, he remembers that time and feels an inappropriate excitement. Tonight, as he is peeking, the father-in-law is suddenly given a provocative look by his son's wife during sex...!