Oh, him? He's my servant, y'see! I've got more of 'em where I'm from.

[The water is going to take a moment to boil over at the right temperature, so Yeyasu will use that time to socialize! It was a good thing that conversations for him came as easily as breathing...]

That's known as a Prinny. They're the souls of sinful humans who couldn't pass on proper... So in order to work off their crimes, they get hired to do all sorts of tasks and go through rehabilitation before they can be reincarnated into good humans!

[Or demons sometimes. It's a case by case thing!]