I live in Tokyo away from my hometown, and I returned to my hometown for the first time in a long time, taking advantage of a long holiday. My parents and grandfather live in my hometown. My grandmother passed away, and my mother is caring for my grandfather, who is depressed and half bedridden. My father is not interested in the family and is always out. One day, a strange voice leaked from my grandfather's room. It sounded like the meowing of a stray cat. Concerned, I quietly opened the shoji screen. Then... In the room, there was my mother's vulgar figure, moaning while having her breasts greedily devoured by my grandfather, and my grandfather lovingly playing with his cock... I couldn't help but touch her, even though I knew it was wrong.