Legally Hogsmeade

"Oh, I'm sure Sirius Black will be arrested soon, Harry. You'll be able to come with us to Hogsmeade next time." Hermione tells Harry one afternoon. But Harry wants to go there now, and legally. So the Weasly twins help him out, and the end result is a most spectacular, and unexpected, one. AU Prisoner of Azkaban and AU Order of the Phoenix.