The reaction isn't exactly new. Nill offers him a small smile in return, if slightly tense, scooting a little closer to the flames. It would be really nice if she could turn around and let them warm her back and wings as well, but she does not know the man that she has joined, and does not have enough trust in the inherent good of people within Arenas to turn her back to him. Instead she spreads her wings a little more, taking the opportunity to offer them more warmth while giving him a chance to look at them if he wants to. People usually do.