hi hi as therapy is expensive and your yui lives au has given me unrepairable brain damage, so I'll leave a few questions :Dc
based on your last post, how would the interaction between the twins post-ssv be like? yui finally having his brother back, them being able to catch up on lost time?
also, smth that i find quite funny is the idea of these two acting like normal 14-year-olds bc they deserve to act their age. bc imagine walking past these two and they just start shit-talking you. they're teens. they know no remorse. no mercy
no idea how plausible such a scenario is in your story, but just a silly idea :]]
and lastly!!! now with mui fully back again, would yui strive for a hashira title? or remain happy with his current status?
also kokushibo. just. yeah kokushibo bc bro.
Don't worry yui lives gives me unrepairable brain damage too <3
(ty for the questions I love an excuse to yap :DDDDD)
To put it simply post ssv is the happiest both twins have been in a long time! That's not to say they had no happy times before or that everything is completely fine now (trust me it's not and it Will come up later ;)) but you get it.
Yui is so damn happy to have his little brother back. He's missed him so much and seeing him without his memories hurt a lot, even if they did eventually adapt to it better with time. It's a lot of stress off his shoulders because he's been trying tirelessly to take care of Mui for years so he feels a lot lighter now,,,
More importantly, he's so glad that Mui isn't suffering anymore. Yui knows Mui better than anyone else (even if it did take him a while to relearn how to read Mui after he lost his memories) and as such he knows better than anyone else how much Mui was also suffering and struggling with his amnesia where the rest of the corp saw a self sufficient prodigy. Muichiro is canonically anxious about his memory loss and I hc him to have horrible brain fog and fatigue from it as well I am going to eat my shoes-
Yui's also gone through his own character development over the years and is nicer, more like the Yuichiro from before their parents' deaths! He gets to apologize for how he treated Mui before and explain why he did the things he did,,,,,,,
Meanwhile Mui gets to finally find himself again, and while his memory probably won't ever be as good as it was before (I hc that he had really good memory before which hammers in harder how much the trauma of what happened messed him up), he knows who he is and has a sense of purpose beyond just kill demons and protect Yui. He feels like he's got so much to see and experience now that he's mentally present again and wants to make up for lost time. He's still very duty oriented don't get me wrong, that hatred of demons and duty to the corps is still there. But he's also more inclined to take breaks, and he's pretty excited to try new things and have a bit of fun. With Yui alive and the happiest Mui has seen him since their parents died, it heals a part of him that canon Mui doesn't get to, so he's closer to how he was as a child compared to canon Mui as well.
These are mostly during the recovery period (ft. the Yoriichibot au by corvidel on tiktok/bluesky! he's got more crossover doodles btw <333) but the twins are so silly and goofy together trust. It's not fully the same as it was when they were kids, they're more mature now, and traumatized. But they're doing a lot better,,,
In fact, during the hashira training arc, Yui's the one that suggests for Mui to loosen up and take a break which leads to everyone getting to make paper planes together! (he recovers first and arrives at Mui's training before Tanjiro does so Tanjiro and the other slayers that come after get to have a Mui that still trains them very hard but is kinder and more encouraging with his words compared to the guy that tells them you suck and will die 3 times over lmao)
They totally still shit talk people though I love these two little shits dfsgdsfgdfsdfg
Sanemi in particular is victim to this because @goldngazes and I both adore Mui and Genya's friendship in canon and in kimetsu gakuen (Yui hates both of the Shinazugawas for other reasons but they also remind him a lot of how he and Mui were like before the demon attack and it pisses him right off)
And nope! Yui never truly wanted to become a hashira, only to protect his brother. He would like to get stronger yes, but he doesn't really care for the responsibilities that come with being a hashira. Each hashira has their own region to look after, so in the event Yui were to become a hashira he might not even get to see Mui as often as he already does. And while the master might make an exception for him, he's happy with his current ranking since he already tags along with Mui on non hashira level missions.
Admittedly, after Rengoku's death he kind of spirals a little because oh god not even being a hashira is enough to guarantee survival. He feels like he *needs* to become a hashira so he can go on those high level missions to protect Muichiro. But he learns to trust in Mui more post ssv, and focuses more on growing at his own pace.
As for Kokushibo you'll just have to wait and see :]