Hyung, fall with me all the way into depravity

"Hyung, I swear... I'm going to break you." Every night, Seonmin wakes up covered in semen. He assumes he has been masturbating in his sleep due to a chronic sleepwalking disorder, but in reality, his younger brother has been secretly conditioning his body every single night. "You've lost it, Kang Seonmin. Now you're doing all kinds of crazy shit..." Taejun witnessed his single mother's suicide and lived in an orphanage before being taken in by Seonmin's family at age ten. Completely unaware that he is being violated by the very brother he pities, Seonmin is slowly dragged down into an abyss of depravity at Taejun's hands...