ROE-431 - When I returned home, I found my grandfather and mother engaged in sexual activity. The event I witnessed that day turned me into a lifelong "mature woman enthusiast" - Tsubaki Saeda.

I was living alone in a dormitory near school and returned home for the first time in a while. My parents and grandfather lived at home. My grandfather had been bedridden since my grandmother passed away, and my mother was taking care of him. My grandfather would call my mother with an indescribable voice, having her attend to his needs. One night, a strange sound leaked from my grandfather's room. It sounded like a growl mixed with a sweet female voice. Curious, I quietly opened the shoji screen. Then... there was my mother, happily moaning while having her breasts sucked by my grandfather...