What are you leaning most towards? Because Luz is someone that Oz would probably snap for. His B-Rabbit power can be kind of scary (Oz gets caught up in it,) so I'm not sure if that's a side of him you'd want her to see. But if you're interested, I'd be curious to see how that affects their CR! Thus far, Oz is fond of Luz and would absolutely go out of his way to protect her.