I don't have time to do a detailed writeup because I have to get ready for work like... half an hour ago, but I know we mentioned that Billy in particular will want to interact with him - strictly because he came from a hyper-religious background and was sheltered and didn't know what to do with himself.
Milo's going to be painfully jealous of those beautiful wings, but will (sadly) help him tailor any new clothes to fit them.