I was living in a school dormitory, but I came back to my parents' house during spring break. My parents and grandfather live in my parents' house. My grandmother passed away a year ago, and my grandfather was so shocked that he was bedridden, so my mother was taking care of him. Speaking of my father, he had no interest in his family 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 what it sounded like. I was curious, so I opened the sliding screen. And then...in the room, my mother was sucking her breasts and lovingly stroking her grandfather's dick...