I live in a dormitory and came back to my parents' house for the first time in a long time during the long holiday. My parents and grandfather live in my house. My grandmother passed away a year ago, and my mother was taking care of my grandfather who was bedridden. My father was just a drunkard, and was interested in his family. One night, a strange voice came from my grandfather's room. Did a stray cat get in? It was a sweet voice. I was curious, so I quietly opened the sliding screen. Then...inside the room, my mother was happily stroking my grandfather's dick while my grandfather was sucking her milk.