Oh really? That's a shame if you want more than one. [Tsuna didn't know that, but well, he's never thought about having a pet before]
Ah, I know that! [Waving his hands in front of himself, and then he freezes, nervous] O-Okay. [He takes the cat gently, holding him almost awkwardly. But he seems harmless, so that's good!]
Do you need any help? N-Not that I know anything about fish food...