Well, maybe it started out that way. Now it's just habit. [It really is. Even if they ended up friends someday (Never going to happen, ever), he'd still be calling him that.]

Eh, it gives me something to do besides study magic and draw. [Playing with...the image of a cat 'playing' with a mouse comes to mind, but this cat has fangs and batwings. Kai scowls a little at that, then nearly snickers as he imagines the mouse with a teeny Keyblade.]

...I almost wish I could look at things like that.

[He can't believe he actually said that out loud. And to Bakura, for Light's sake.]