[More than a sister...Always a friend...Less than a lover] A strange love relationship where she continued to have sex with her shut-in brother for 10 years, something she can't tell anyone about. - ``It's not that bad...You're my hero,'' says the younger sister, who tries to comfort her when she sees his dark appearance. - One day, I found out that I happened to see his erect penis in the morning, and when he asked me to ``job it with your hands,'' I couldn't refuse and ended up having sex with him. - From there, their demands escalate and the moment they cross the line... their dirty room becomes their secret base...