There is so much to unpack when it comes to the reaction Inigo's mind has to that 'I'll do that if it happens to you' statement, but we don't have time for that. Especially since Tidus continues, and Inigo's mind continues right along with it, for better or worse.

Because it mostly ends up with him looking ridiculously shocked.

"What was wrong with that I did?!" Is Tidus even making fun of him for what he said? Inigo isn't even sure, but maybe it's exactly the initial thirsty freaked out reaction he has to the idea of Tidus kissing him that leaves him vulnerable for taking anything as him getting teased. "It worked, didn't it? I was being super clever!"