I think the relationship between Nika and Bella will crack in a short time. The first igniter of this may be Nika's lack of hardening, but I think the main reason will be jealousy. There is a growing closeness between Nika and Zara, and of course, depending on the options, Zara has already started to fall in love with Nika. We know how competitive she is, conflict with Bella seems inevitable. In addition, both Bella and Nika already have an ultimatum. Bella warned not to lose my trust. Nika, on the other hand, made it clear at the book meeting that if Bella creates a childish drama, we're done.
If I know Ocean, he's already got a relationship drama ready.