Please don't emphasize too much how the whole train could hear them, okay. Is this something Inigo technically knows, somewhere in the back of his mind? Yes. Is it also something he actively has to block out in order to not look like a total flustered idiot on the network all the time? Yes.

Let's let sleeping dogs lie, okay.

"We don't have it on the train, Tidus. You can't just show me." It sounds a little pouty, but even as he's pouty, he's settling right back in against Tidus's side, against his shoulder. That's his claimed spot now. "I don't think any of the worlds we went to had anything like it either."

Or Inigo just missed it. Because he didn't know about it in the first place.