The higgledies are more than welcome to use Inigo as their own little private spectator seats, really. Inigo doesn't do as much as blink when they jump up and settle on him like that. They're cute! He likes them! So of course they can just come sit on him, no problem.

Though he is realising that it would be better for him to take a few steps backwards here, just in case. The last thing he wants Tidus to walk in on is some really, really dumb accident.. So he does back up a bit.

"I don't know, at least we'd be even then." It's definitely a joke on Inigo's part, though there's obviously a core of truth in there. Don't think he's forgotten the accidental slap, okay. "Don't worry though, it will be fine! Just go ahead."