MBJ ends up on An Ding with SQH and staying there full time.

SQH finding artifact that allows MBJ to pass as human since he'll be here for extended stay and probably won't stay in house the whole time. Plus he can put it back for protagonist to find artifact his is done.

MBJ ends up on peak and all the disciples see 2 together and OH that must be Shizun's husband/wife... I thought they were a demon oh well.

Him spending months with SQH and spending time with him and not having to fight able to actually relax just being with Qinghua.

SQH also finding lots of weapons and treasures and books for his king, he must be hating being stuck here and having to rely on him for everything. MBJ is loving it

MBJ loves being Qinghua's doted upon wife just lounging around and watching Qinghua run his peak listening to him insult and complain about his fellow peak lords.

He is getting rid of or vetoing all SQH plans to get North back.

LBH finding out about SQH's new mystery spouse and....is that MBJ? He's suddenly throwing all plans out and interrogating MBJ HOW? How did you get to be a peak lords wife? TELL ME EVERYTHING!

I had a big fanfic in a previous fandom where one of the big reveals was the involvement of a kind of infamous villain, whose presence was built up to and foreshadowed through the whole fic until his reveal without ever mentioning his name, so that the name drop would be a gut punch. It worked especially well because of who the villain was and his presence in that fandom space specifically (it's very complicated) and if it was an original story this reveal wouldn't work at all the way it was written in the fic. Because if you don't have a predisposition to think about that character and his relationship to the hero in a very specific way, then just seeing their name won't do much to you; the reveal and the recontextualisation it pushes upon you hinges on your previous knowledge of the source material.

I think it's an interesting tool fanfic authors are given. One of my favorite fanfic of all time is partially a re-imagining of its source material's canon, and something it does is introduce antagonists much earlier in the story or deepen npcs' stories. It then works to evoke a tragic irony that again wouldn't work if you didn't know the source material, and it's something the author obviously has a lot of fun with.

Y’ALL THIS IS GETTING RIDICULOUS,,, 😭

a usually reserved and mild-mannered character

going apeshit for the first time

on behalf of their loved one

who, as they think, is being horribly mistreated by the target of their rant

(even though the loved one endured some great hardship for the sake of the target in the past)

and so despite knowing that the target isn't aware of their loved one's suffering

(and the speaker themselves being involved in inflicting that suffering)

"WELL THEY SHOULD FUCKING KNOW ABOUT IT, THEN"

they deliver the truth in the most accusational way possible

to make the target feel bad and leave their loved one alone and stop causing them harm

while, crucially, not knowing that the target cared about their loved one just as much