I was living in a school dormitory, but I came back to my parents' house during spring break. My parents and grandfather live there. 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 family life and was always out playing. I was just relaxing, but 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...