ROE-381 When I went home, I found out that my grandfather and mother were having an affair. What I s

I'm a working adult living in Tokyo away from home, and I took advantage of my days off to return to my parents' house for the first time in a long while. My parents and grandfather live there. My grandmother passed away a while ago, and my mother is caring for my grandfather, who is depressed and semi-bedridden. My father is uninterested in his family and is just a drunkard. One night, I heard a strange voice coming from my grandfather's room. Could it be a dog in heat that had snuck in? It sounded like that. Curious, I...