During my wife's pregnancy, my mother-in-law Yuna came to Tokyo to support her. My wife forbids me from smoking or masturbating, so I couldn't take my eyes off the beautiful and attractive Yuna. Then one night, my wife found me masturbating in secret and we got into a fight. After my wife went to bed, I was sneakily sniffing Yuna's underwear when she saw me. Yuna didn't blame me, but instead reached for my crotch and said she'd help me relieve it...