My wife was hospitalized, so my wife's mother came to Tokyo from her parents' home to help with the housework. Living alone at my daughter-in-law's house, the mother-in-law and the son-in-law became intimate and their lust for each other gradually grew stronger! Attracted by the lustrous skin of my fifty-year-old mother-in-law, I fell into a secret adulterous relationship with my daughter-in-law!