He'd been so focused on his question that the tone of her response takes him off guard. It translates merely into him raising his eyebrows and considering a moment. But he does want know.

(He has the brief thought that he is sure Petrana would understand leaning on a perceived attraction for information, but he isn't sure where Marcus stands on it: a conversation they should probably have later.)

Still, for now, he takes her invitation. "It wasn't a line, for what it's worth. You really do look familiar, but I can't quite place it."