I have something to confess, guys:
I don’t really have a strong relationship with Canon.
We acknowledge each other, vaguely, and I can see where it has its uses…but we aren’t anything more than passing acquaintances.
Surprising, I know.
THAT BEING SAID.
I wrote transgender!Cersei a little while ago and I just want him to have adventures with Brienne and Jaime. Like he would want to see and do everything that he was never allowed to do when he was Queen. He will maybe overcompensate for lost time, getting them into all kinds of hair-raising shenanigans, joyfully throwing himself into battle with next to nothing in terms of martial experience.
Eventually Brienne and Jaime will talk Cersei down and get him to use some of the back-stabbing scheming skills he perfected while Queen.
I don’t think Cersei will like Brienne much- still too ugly, still a freak in his eyes
and Jaime is showing something that might be affection towards her, which won’t do at all though he won’t say no to some lessons in swordsmanship from her.
This is what happens when a ASoIaF/GoT newbie gets ahead of herself.