The one with infinite ping pong balls

Sehun has been in a comatose state since he was four years old, when he fall down two sets of stairs at his grandmother's house. Luhan has been by his side the whole time, talking to him and watching him grow. Luhan hasn't spoken to anybody but his boyfriend, Kris, and Sehun's doctors since the accident. When Sehun wakes up, 16  years old with the mind of a 4 year old, and the body of someone who has been asleep for 12 years, how will his life work out? What will Luhan do, only 19 years old,