Kind of weird that, when these two are the only ones in the mansion, they only these short interactions
One would think that they always would be around each other ¯\_(ツ)_/¯ It's a gag manga the lore doesn't have to make sense
@reu depends on the size of a mansion. If it needed a staff, it was probably pretty big. Un-cared for houses fall apart rather quick. I can see her being so busy that they only see each other every so often.