"So your sister fights in one," is instantly what Tidus is hearing here, deciding to take it that way despite previous objections. You can't hide it when you say it like that, Inigo!

But it's alright, since Tidus--after a beat--has another thought on his mind. A curious glint catching in his eye (or is that something else?).

"So, your sister," he starts slowly, clearly looking to go somewhere. "What's she like? She pretty nice?"