I'm not so sure about that? She's been a wreck from the start The only reason MC is in the tower is because she made a mistake and had to make him a farmer out of necessity.
Rather than childish, I see her more as spoiled because of the overprotection from her family and the problems with her dragon heart.
Either way, the only nice, unproblematic, totally plausible IRL (I sweat pls believe me) is between babies Theo and Iona

RANT INCOMING
I know this is probably going to get ignored or people are going to be ppissed that we're still talking about it but when I first read this I always seen the beings in the towers as cute babies like I would for most animals but the entire time I always thought of Eileen (I think that's her name the black dragon) as like a smaller child even with her more active role i still thought of her as a child not a love interest and I feel like that's why im so disgusted and hating the romance aspect of their relationship even if it's not shown yet so feel free to ignore this if you don't feel the same