Going Stag - A Grimmauld Fairy Tale

Siblings Hermione and Harry are on the run from their wicked stepmother. However, her curse lands Harry over the edge and he's a bit harrier than usual. Just what's a girl to do when she's got game for a brother and the King is hunting in their wood? Is stepmother dearest gone for good? Part of the Grimmauld Fairy Tales, rated M for a reason.