A Challenge of Unexpected Sort

"I need you." "Excuse me?" "I need you to work for me". After the war, Hermione grieves the loss of her bestfriend/lover/confident Fred. No one knows why she can't shake herself out of her painful reclusion. Harry, desperate to save her plays his last card : rehabilitated but somewhat bored Severus Snape. Challenge accepted. Eventual HGSS, Ron-bashing (violent Ron)