In the netherworld demons with more animal fechers like Opera originally get a mate before marrying them later on...and you just so happens to be Opera's mate and they're really protective of you...you ended up getting summoned to the human world and kinda got stuck there for a year or two to help the one who summoned you which means you haven't seen Opera since...during the year or two you were gone iruma came...but now you're back in the netherworld and at Sullivan's Manor to surprise Opera