Harry Potter!AU. All Slytherin wore masks, Changmin and Junsu were no exception. One step outside their dungeon and the masks would be in place. ForewordTitle: Mansions Built Upon SandMain Pairing: Changmin x JunsuRating: PG-13 for nowWarnings: male x male relationship, lots of spells and magical referencesDisclaimer: I do not own either Super Junior/DBSK/JYJSummary: Harry Potter!AU. All Slytherin wore masks, Changmin and Junsu were no exception. One step outside their dungeon and the masks would be in place.Unbeta-ed. All mistakes are mine.