Unfinished Business

Harry struggles as the Wizarding World rebuilds. He wants to move on from the war but something keeps him in the past. Snape haunts Hogwarts after his death though all he wants is rest. Do he and Potter both have unfinished business? What role does the new DADA teacher, a haunting man better suited to a funeral home than a school, have to play in it all? Slowburn Snarry. Dramione.