I lived in a dormitory during school days and returned home for a long holiday. At home, my parents and grandfather lived together. My grandmother had passed away a year ago, and my mother was taking care of my grandfather who was shocked and bedridden. My father, on the other hand, had no interest in the family and was always absent. One evening, I heard strange noises coming from my grandfather's room. It sounded like a wild cat had gotten in. Curious, I quietly opened the sliding door. Inside, I saw my mother, her breasts being sucked by my grandfather, and she was lovingly stroking his cock.