The most natural way for BrambleHolly to work is that they get together after the big reveal, because they're both upset and that mutual spitefulness brings them together.
But imagine a world where there's at least some will-they-won't-they before that, right. Like maybe Hollypaw/leaf is too in her own head about being a loyal clanmate and convinces herself that if she can be with the clan deputy it'll erase any doubt. So she and Brambleclaw have a series of interactions where there's mutual pining developing, but he has to keep pushing the "no, this is wrong, we can't."
Then the big reveal comes and amidst everyone else's shock the two of them just lock eyes like, wait a minute. So we're not kin? And they're on each other in 0.5 seconds.










