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[Sasuke's first thought is to say, "You look stupid." But he can't really properly say that, because at least Kakashi's kitty ears are fake, whereas Sasuke is, as he really must remember, currently sporting real kitty ears.
Sasuke is more of a cat person, but that doesn't make this situation any less stupid. And Kakashi - well. Sasuke would say that he is acting weird, but he isn't really. He's acting weird because he is weird, so really, he's acting just like he always acts. So much for the initial "suspicious ANBU" thing. It's been only a couple of minutes and he's already back to "Sasuke-kun" and pulling ridiculous stunts like this.
Sasuke snorts. It's not really an annoyed snort. It's not really an amused snort either, but it's close.]