@imadoathing
He was always one.. He had his wings hidden because he was in the middle of pretending to be human and her "friend", and in that role he's clearly uncomfortable with what she did to the protagonist, but as a tengu his role is that of a "servant", he has no choice but to submit to her as long as he is a tengu.
I thought this would be some lowbrow romcom, but these developments have been very fun. Happy that this has been going beyond my, admittedly low, expectations.