I was living in a school dormitory, but I came back to my parents' house during the long holiday. My parents and grandfather live in my parents' house. My grandmother died a year ago, and my mother was taking care of my grandfather, who was so shocked that he was bedridden. My father, on the other hand, had no interest in his family and was always wandering around. One night, I heard a strange voice coming from my grandfather's room. Did a stray cat get in? That's the kind of voice it was. I was curious, so I opened the sliding screen. And then...in the room, my mother was sucking her breasts and lovingly stroking his dick...