My mother-in-law was coming to visit us for the first time in a while, so I asked my wife to have sex with me before that, but she refused as usual. I hadn't had sex with her for the past few months, and my desire was about to explode. Then my mother-in-law came to visit. I had always thought she was a beautiful woman, but she was still as beautiful as ever, and I was mesmerized. That night, I tried to get excited by my drunk wife, but she refused, so I sulked and went to my mother-in-law's bath. I couldn't calm my frustration, so I masturbated with my mother-in-law's underwear in the laundry basket, and she found me. I tried to cover it up by telling her that I hadn't had sex with my wife, and she comforted me. But my arousal wasn't cured, and late at night when everyone was asleep, I sneaked into my mother-in-law's futon...