The Wizard's Butler by Nathan Lowell

A gentle story. A former military man and a former EMT takes a job as a butler. The man's niece, who hires him, tells him the man thinks he's a wizard and is suffering from dementia.

It goes mildly on. Doctor's appointments, an internet connection so he can learn to cook on the job, pixies that get annoyed if you horn in on their job, a fire, buying a new car, the niece's unpleasant visits, DNA testing and more.