[It is very simple, but Demon King is like an infinitely old shut-in. He can't remember the last time he performed an informal greeting in person, nevermind these gestures which are... something you do with one you are familiar with, normally?

That said, he is a little swifter on the second one.]

Hmmm! I see...! It seems like it is helping to stabilize and strengthen my little elemental tag-along... somehow.

[It's not like it is a sentient addition to his energy, so he can't ASK it, but he can feel it.]

Fascinating. And so easy, too.