So would their fusion name be like Lucierra? Are they like a brown fox now? It might've looked better if they were like a cross fox instead. What gender would they be now? What pronouns might they use? I guess that's part of why it's so confusing, that and all their thoughts and memories meshing together.
I kinda figured he'd mostly use her body for the wings temporarily and just keep her head separate from his own, like just be a two headed creature, he might have trouble separating their brains properly now. But then, it's it's own weird magic, maybe he's able to retain some kind of signature of their own original forms somewhere inherently and separation isn't entirely rebuilding from scratch each time. Or maybe this new being will find their own identity and not want to be separate individuals again!