There are legends among the pureblood families about Keepers-special witches who have the power to restore a fallen House. If any House needed a Keeper, it's the Ancient and Noble House of Black. Hermione/Multi (Cygnus, Orion, Sirius AND Regulus). Polyandry.

Expanded from one of the whimsical drabbles. When Harry reckons that being chosen for the Triwizard has nullified his contract with Hogwarts and expelled him, he strikes a deal with Karkaroff, to Dumbledore's horror. Not to be taken seriously, just enjoy the anarchy and mayhem.