Roy didn't react immediately. He'd been on his guard for this conversation, and held back the immediate reactions. The fact that the other Mustang was in Isvhal wasn't a surprise, the fact that Lust, this Lust, was from Isvhal? That was. He wasn't sure about her, but he could continue on with the assumption it was true without any risk.

He took a moment to put his thoughts in order before he spoke. "I would not have guessed that you were from Ishval. But I can confirm he and I have that in common." It wasn't something he spoke about often, but it wasn't something he hid from, either.