I've heard tough experiences make people grow together a lot faster.

[He wonders then, what the others back home must think of him? Tough situations can certainly foster stronger camaraderie, but it can also foster feelings of misgiving, if not properly tended.

Kazuya shoves all that down and away, though, laughing as Weiss tells him to play nice with her friends, and he gives a teasing hum.]

I'll play nice... Maybe after a bit of terrorizing. Just a little, though.

[It should be clear enough by his tone he wouldn't do that. Weiss' friends are his.]