His own eyes widen for a second, before he can catch himself. Mr Ghost . He's never had anyone spontaneously call him that before, and he simultaneously wants to squeal with delight and -

- well, he has a lot of complicated feelings, all of which can be dealt with when he's alone. That's what alone time is for.

It's hard to return a bow when you're shaped like a floating blob with no waist to bend at. Metta just has to do a polite little bob in mid-air and hope the human gets it.

"No, no... sorry, sweetheart, I didn't mean to intrude." Humans seem to be easily spooked - which makes sense, he guesses, they'll never have seen a ghost like him before. He'll need to be careful. "I was just curious. You seemed to be so hard at work."