ERDM-169 - Watching AV with mother-in-law!! Seeing my son-in-law's erection right in front of me aroused desire, leading to 4 hours of intercourse.

I paused the AV and went out to the convenience store for a moment, but the screen was off due to power-saving settings. When I returned, my mother-in-law was folding laundry in the living room and asked me, "Would you like to watch TV?" and turned on the power at the same time, the screen showed the erotic video I was watching! Out of curiosity, my mother-in-law said she wanted to continue watching, and reluctantly we decided to watch it together. Mother-in-law and son-in-law, can they maintain their sanity?