I like to think about the post-Ladynoir fight
First, them awkwardly getting back to their old dynamic. They'll interact clumsily, afraid they'll say something wrong, afraid they'll do something wrong. Very shy banter, little glances to make sure the other is ok with the teasing, that they're not overstepping the other's boundaries. Sending each other tentative smiles, and inwardly raising a victorious fist as said smile is being reciprocated. It's slow, but they're making progress, and relearning to trust each other.
Then, them getting a little less shy, a little bolder with time. sending a praise to their partner then and there, when they did something good in battle, and praising the other back. Over-asking if what they're doing is okay, and "are you sure"s, "really tell me if that's ok with you"s, and getting used to this dynamic between them, both familiar and oh so new.
Slowly, they get more and more affectionate. Ladybug, particularly, shows Chat Noir how much he means to her at every given opportunity. A little cheek kiss there, a hand on the shoulder here, a wink sent his way then. And in return, he smiles at her, showing her how much he appreciates the gesture. Takes her hand, squeezes. Silently saying "I'm not going anywhere. Not anymore."
The more this goes on, the more they share what they can and need with each other. Every doubts they have, they bring it up. Every irritation they feel, they discuss. And every insecurity they get, they lift each other up.
And soon enough, they're back to being the powerful duo they were. It's the same, but it's also not. Because this time, they know with more certainty than ever that they have each other, that they'll always chose each other because they want each other, and they they'd never give up on each other ♥︎