In Luna's vast experience, both as a prostitute and a woman on planet earth, men who called themselves Good Guys rarely were. But she supposed he was a different kind - these people all had to be whatever their stories made them, so maybe he literally had to be a good guy?
Either way, Luna smiled and nodded to show she didn't think he was trying to make moves. Then she said, "I might hold you to that offer." She didn't have a whole lot of what could be called 'friends' in New York, and she figured that folktale people was closer to Real Humans than gods could be.