[Toph isn't trying to make things get dark -- only express her irritation at being separated from what has, in its own way, come to be family . . . and family isn't something she separates from easily or willingly.]

Maybe I can come stay for part of the time, too. I mean, you've already got Katara and Sokka over there, right? If Sokka can blend in okay, I probably can too.

[His gesture hasn't gone unnoticed, though -- and for this he receives a solid whack in the arm.]

Yeah, you'd better come, though. You've still got stuff to train on.

[Never off the hook. Ever.]

Plus Sparky will get all droopy and decide the world hates him again or something if you don't.