"I've already ejaculated several times..." The grandfather, driven to dementia by ejaculation, and his mother's secret, unconventional sexual encounter. Nozomi Tanihara DLDSS-560

My parents, grandfather, and I live together in my father's old home. My grandfather's dementia is getting worse; he often repeats the same things and misinterprets them. He mistakes my mother for my deceased grandmother and touches her buttocks and breasts, but my mother always takes care of him gently and selflessly. One day, when I returned home, I heard noises coming from the kitchen, so I peeked over and saw my grandfather calling out my grandmother's name while having sex with my mother. I was so shocked by this scene that I couldn't look away.