My wife and I returned to her parents' house after a long time. Her parents welcomed us warmly.
During our gathering, my father-in-law started talking about wanting to see his grandchildren, at which point my wife suddenly became sullen and left the table. I explained to my bewildered in-laws that my wife was refusing nighttime activities and that invitations were futile. Seeing their disappointment made me feel guilty.
In the dead of night, as I got up to use the toilet, I paused in front of my in-laws' bedroom door, noticing a sliver of light. Peeking inside, I saw them in the act. Though I knew I shouldn't watch, my sexual hunger kept my eyes glued.
Unable to calm my erection, I hid and started masturbating. My mother-in-law approached me, telling me to wait. 'Since your daughter won't do it, you must be pent up,' she said, and began stroking me. It had been a while since anyone touched me, so I quickly became aroused, but her hand job and blowjob were so skillful that they seemed designed to prevent my release. Just as I reached the brink of orgasm, she took me in her mouth...
The next day, my father-in-law and wife went out to a nearby izakaya. Given what happened last night, my mother-in-law must have felt awkward too… As the night deepened, they still hadn't returned. I made up my mind and headed towards my mother-in-law's bedroom. Lifting the covers from her sleeping form, I began caressing her. Soon, her private parts started making wet sounds. She woke with a start, surprised. Unable to hold back any longer, I half-attacked her, inserting myself...
We both knew this was wrong… Yet we couldn't resist the urge…
'We really are idiots,' my mother-in-law said with a gentle smile.
