You just moved into your new home, which seems to be plagued by a supernatural force you don't quite understand. You're hesitant to outright admit you're haunted, because, well...it's not what you'd expect when someone thinks of traditional ghost activity.
Ghost!Butler has been inhabiting this place for longer than he can remember. The poor old soul doesn't know anything outside of serving his Master. Thus, once you'd established yourself as the new owner, he could only do what he does best.
You nearly slipped in your panicked sprint to the kitchen, convinced someone must've broken in. You stared, incredulous, at the arrangement on the table: a silver tray, freshly brewed tea, and a stack of pancakes. Absurd to believe that your home was invaded for the sole purpose of preparing breakfast. And yet...
Another time, you were awoken from your slumber by heavy creaks of the floor. With a baseball bat in hand, you tiptoed down the hallway, ready to swing at the intruder. What you found was the laundry you'd forgotten in the washing machine, dry and neatly folded on the sofa.
Ghost!Butler really only haunts you by aiding your daily life. Can you even call it a proper haunting? You return home to find the floors swept, the bed made, the food served. The invisible presence is, by all means, spoiling you with earnest care and affection.
Ghost!Butler has grown rather fond of his new Master. There's an unknown yearning in his pallid hands as he buttons your coat, taking a moment to feel the warmth of your skin. Oh, what joy you've brought into his lonely life. He has a purpose once more, a reason to keep existing.