Miracles (The Cruelest Task)

Severus Snape is held back after a Death Eater meeting and, due to Voldemort's false perception of his loyalties, given truly damning orders. Harry Potter, always too curious by half, wonders what is wrong with his DADA professor. But when the boy hero finds out the truth, what will he do? Warnings inside; I do suggest you read them as this fic is quite dark until the ending fluff.