When I Returned Home, I Found That My Grandfather And Mother Were Having Sex. What I Saw That Day Changed Me Into A "mature Woman Lover" For Life. Fuyuka Hoshi

I left my hometown and now live in Tokyo. I took a break and returned to my parents' home for the first time in a while. My parents and grandfather live there. My grandmother passed away, and my mother is caring for my grandfather, who is depressed and mostly bedridden. My father has no interest in the family and is always out and about. Then one day, a strange sound leaked from my grandfather's room. It was unmistakably the sound of a female in heat. Curious, I quietly slid open the shoji screen. And there... in the room, I saw my vulgar mother, moaning as her breasts were greedily sucked by my grandfather, while she lovingly toyed with his cock...