The home of sister Cana and brother Yuzuru is narrow, and the two have shared a room for ten years, sleeping side by side. The younger brother was very curious about his big-breasted older sister. One night, while the younger brother was asleep, he felt his sister playing with his penis in their futon! From that day on, every day the younger brother would be jerked off, given a tit-fuck, and have sex with his sister, treated like a toy... The younger brother also felt good and satisfied. This strange but ordinary relationship continued for ten years!
