"If there are visitors present when I am not, it is not a situation that will last long or that you will need to concern yourself with." He is... absolutely confident and in fact downright confident on that point. If a devil is messing around the Manor, they have chosen the wrong person to mess with, several times over.

"The odd mortal providing a service is a possibility." And then: "Two may not be a household, but three is and you are part of it now." And truthfully Zerxus' life would be much easier and safer, both in being able to work and not being targeted, with that both known and clear.