"Okay then!" Said in the tone of someone being called out and willing to accept it. Tidus isn't a coward, he didn't make the offer in a thoughtless remark (this time)!

"Your Prince, then. Are you enjoying your meal? Do you want a drink with that? I gotta say, that shirt really brings out your eyes."

He hasn't got the voice work of Inigo, the fun and underlining jest too obvious to take seriously. But it's not so exaggerated to be unable to roll with. Tidus is putting serious effort here!