After a long time, my wife and I returned to her parents' home. Her parents welcomed us warmly. During a family gathering, my father-in-law started saying he wanted to see his grandchild soon. My wife suddenly became upset and left the table. I felt sorry for my in-laws' disappointment when I explained that my wife was refusing intimacy and couldn't be persuaded. Late at night, I woke up to use the restroom and stopped in front of my in-laws' bedroom door, where a light was leaking out. I peeked inside and saw them in the midst of their intimate moments. Although I knew I shouldn't be watching, my pent-up desire made it impossible for me to look away. Unable to control my erection, I was masturbating in secret when my mother-in-law appeared. She told me to wait, saying that since my wife wasn't around, I must be getting hard. She offered to help me out, and started teasing my son. I quickly became aroused by the unexpected touch, but my mother-in-law's skillful hand and mouth play wouldn't let me climax. Just as I was about to explode at my peak, she took me in her mouth... The next day, my father-in-law and wife went out to a nearby izakaya. I'm sure my mother-in-law was also feeling awkward after last night's events. As the night deepened, they still hadn't returned. I made up my mind and went to my mother-in-law's bedroom. I gently lifted her blanket and started caressing her. Soon, I heard the sound of her pussy getting wet. She woke up with a start and looked at me in surprise. I couldn't hold back any longer and forcefully inserted myself into her... We both knew this was wrong, but we couldn't resist the overwhelming urge. "We're such fools," my mother-in-law smiled gently...