I honestly don’t think Kyoko would give Celestia any time of day.
I think Kyoko is one of those characters whose relationships only work if they start out really young, because the older they get, the harder it would be to really form a relationship with them due to how closed off they grow to up be.
I think with all of her relationships, platonically included, whatever character has to be in her life in that year in such a specific environment for her to really trust anyone to the extent that she does. If that even makes sense.
So, really. I don’t see many situations where Celeste can really fit into her life, even in an au. Kyoko is too driven. *Nothing* is going to stop her from working on a case, and someone in her ear telling her that they miss her and to come for family dinner isn’t going to slide. She’d just leave/ never be in that situation in the first place.
Finally, in conjunction with that… Celestia is supppper insecure. Changing her whole name, look, accent, the works because she high key hates herself. So… any relationship with her is going to be a lot of reassuring Celeste that they love her for her and being ordered around by her, or else they’ll fall to rank D with her. So. I mean…Personally does Kyoko seem like the type of person to be attracted to all that? Not really. But you know, dealers choice and all. I love w/w. People like what they like.