So for a change, Nathan actually had something go RIGHT for him, and got to request a boon from his goddess, Athene. And one thing I've consistently played for the character is that he wants to fly under his own power, someday.
Of course, he didn't quite specify HOW the wish he made should be carried out, so here's a northern hawk owl transformation for him. Course, in the end, he's STILL getting what he wanted, so he probably won't complain TOO much, this time.
Art by catmonkshiro