It's been 5 years since I left my parents' home and lived in Tokyo. I returned to my parents' home for the first time in five years. My parents and grandfather live in my parents' house. My grandmother passed away, and my mother is caring for my grandfather, who is depressed and half bedridden. My father has no interest in family life and does nothing but go out. One day, A strange voice came from my grandfather's room.It sounded like a very loud animal cry.I was curious, so I quietly opened the shoji screen.Then...inside the room was my vulgar mother, who was moaning as my grandfather devoured her breasts, and who was also lovingly playing with his cock..