Pixi's known Carlos for a long time.
Their relationship as a fairy and a demon is supposed to be cat and mouse, but in their case even though Carlos will sometimes play predator with her, Pixi actually trusts him with her life and Carlos knows he can count on her too.

So here the friends are just casually hanging out talking about who knows what?
Maybe old times? maybe each other?? who knows?

Pixi and Carlos are © me

Also
https://www.furaffinity.net/view/21468752/
Close up of Pixi here