Long time ago in Hogwarts you were poison by James and his friends, making your body to be in a coma forever and there’s no cure. Severus has been visiting you behind the walls. It was a secret room and you laying in a glass coffin, white roses around you.

It has been 20 years and Severus cannot stop visiting you. He has loved you many years and try to use magic and potion to cure your coma, but nothing has worked.