Tidus can call him a creep all he wants. After all, Inigo is just doing the smart thing here. The effective thing, because he can tell that it's affecting Roland. Even if the tail wasn't a dead giveaway at the moment, Inigo would still be able to tell from how easily Roland goes along with it, with the way he immediately refers to himself as daddy. Inigo figured Roland would be at least a little weak to this sort of thing, but to this extent?

Considering that extent, Inigo figures maybe he could push it a little more here. But someone has to be the adult here, and if it has to be him, then sure, he'll be the adult. (Because that's clearly what the guy calling for his daddy while wearing an evil genie outfit is, right. An adult.)

"Fiiine," he surrenders to the deal. The whole thing was mostly about making sure Tidus wasn't just stealing his candy bar like that anyway. Making Tidus sweat a little was just a fun extra. Just like the feeling of those tight muscles under his fingers-- "If Tidus is that scared of me, then I guess I have to go easy on him."

Inigo, please. Please. Are you still not aware that saying anything that remotely sounds competitive or like a challenge around Tidus is just a bad idea?