>>26133726
It's more of something you are expected to do as a maid, rather than an entirely separate job. For example, if Ojou-sama were to walk across a hallway while a fairy maid was cleaning some vase. She would stop what she's doing, lift up Ojou-sama's dress and then check if she needs a change. If she does, then the fairy maid will take Ojou-same to the nearest changing station. If not, then she pats her diapered butt and resumes her work.