it is an entirely hufflepuff au. the au is all about hibari. tsuna is literally in the background
(also in the bg: kyoko is a squib, hermoine talks to her about squibs not having much in the way of Wizarding Rights, hermoine immediately decides that is her new Cause)
(haru is a gryffindor who’s robe is absolutely unrecognizable under all the additions)
(one day gokudera hayato explodes into the broom cupboard where tsuna hides to practice wandwork and yells “I’M YOUR POTIONS TUTOR NOW” because he is so disgustingly offended at how bad tsuna is at potions. they start a study group with neville)
(fran is beauxbatons. he makes a general nuisance of himself in fourth year)
(likewise with byakuran from durmstrang)
(kokuyou group are all werewolves except MM, who is, of course, chilling with them for the money. mukuro is a budding Dark Wizard who hates the ministry, though he’s mostly busy avoiding those pesky death eaters.)
(mukuro is also a parselmouth. he has broken into hogwarts 17 times but never does anything while he’s in there. chikusa is starting to worry he’s doing it because he wants to go to school)
(dino is quidditch captain. wants hibari to be seeker. hibari wants to be beater and refuses to take any other role. they are at an impasse)
(hibari continuously attempts to kidnap harry potter the moment he learns that harry has a ~destiny~, there is perpetually a portkey in harry’s bedroom. harry trying to find them is a new exciting summer game. how the shit is he getting them in here)
(kusakabe is the one actually executing the kidnapping attempts. not necessarily on hibari’s orders. he just wants hibari to have a good reliable friend to play with)
(naturally, he also tries to kidnap hermoine “teach me the battle magics” granger and lily moon, AKA that one random slytherin girl who screamed and hit hibari with a book when he threatened to duel the entire classroom in history class and then started crying and ran to miss pomfrey bawling her eyes out because she didn’t MEAN to.)
(The list of people Kusakabe is entirely willing to force to visit their house only escalates from there.)
(In year 4 tsuna pulls the sword from the hat and from that point on never knew peace)