Nothing wrong with fictional potential wincest~. And i have been hoping for that too, maybe in a bonus, since they aren't both dateable in neutral, could easily meet to discuss something related to peace and bond more, who knows~.
Problem with the first one is Patreon banning incest now btw, so Caro would have to come up with something (some kind of spirit taking his form?) or admit they aren't, in fact, related, which is a running mystery in the gayme.