First and foremost, even of it's not the fic that I'm searching for- I really want to read a tearjerker AS/S, so if you have any reccomendations... Shoot away.
Now on to the fic that I'm looking for:
It was about a wierd Scorpius who thought that something in peoples' blood made them bad, so he became obsessed with finding a cure for it. Albus was trying to protect him, but Scorpius list touch with reality and almost died while trying to find the cure (not eating, holed up, delirious...) I don't know. Anybody have any clue?