Tidus looks up, the noise Katsuya makes somehow noticeable despite the noise of the festivities around them. The close proximity, sure, but probably also that bad luck where you hope not to interrupt someone, and you get their full attention.

Luckily, Tidus doesn't mind. Scoffing under his breath, tipping his head.

"Birthday boy?" ...that's the guy, isn't it? But he doesn't wait for an answer, assuring, "It's fine. You wanna set yours, uh, 'n' some alone time? I can move."

Does he want to move? It makes sense that he wouldn't want to hang around, or so his brain is telling him; but there's a tug in him, a part of him that isn't so sure. That it'd be more pointless to do any of this to just run off so soon.

...he should think about what he says a little more.