I live with my parents and my grandpa, the four of us together in my father's family home. Grandpa's dementia has progressed; he says the same things over and over, does the same actions repeatedly, and mistakes my mom for my late grandmother, touching her ass and breasts. But mom takes care of him with gentle and devoted care. One day, when I came home, I heard voices from the kitchen. When I peeked in, grandpa was having sex with mom while calling out grandma's name, and I couldn't take my eyes off that shocking sight. Since that day, it seems the relationship between the two of them has become even more intimate.