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#yes i'm currently hyperfixated on jamil instead of rook rn
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Thoughts on Sibling!Yuu AU
The main reason I made the Sibling!Yuu AU was because I wanted to see Yuu being the older one for once. In most fandoms, it’s pretty common to see a younger sibling reader fic so I wanted to flip that trope for once. It’s also quite rare for the reader to be older than a teen or an adult. The second reason was the massive angst potential it held. That’s right, Yuu overblot was imminent from the very start in this one because honestly the probability of the overblot boys overblotting much earlier because of Yuu is very high and is extremely likely. Them blaming Yuu for some of the things happening in their life is also very likely.
Sibling!Yuu has everything the overblot boys want to have and those with their inferiority complex would just make it worse.
For example with Riddle. Would he blame Yuu for running away from their mother, which in turn made their mother stricter with Riddle so that he wouldn’t end up like Yuu? Would he resent this fact? He’d likely have a negative initial impression of them because they ran from their own mother and Riddle at an early time still thinks that their mother is always right and that means what Yuu did was wrong. Anything or anyone that opposes their mother is wrong. Anyone who opposes the things their mother taught him was wrong. Anyone who opposes him is always wrong. Though, a deep part of him is envious that Yuu got to be free. Whether Riddle blames Yuu or not, Yuu will think that it’s their fault.
Even if he doesn’t say it out loud, Leona would feel irritated every time he sees Yuu telling him what to do and what not to do so he doesn’t end up like them. Their constant presence keeps reminding him that the only reason he couldn’t become king was because he wasn’t born earlier and Yuu got a taste of that crown, even if they did get kicked out of the family in the end.
Yuu’s constant interference with dealing with Azul’s bullies when they were younger only made the bullies bolder and meaner the moment Yuu went away so there’s that possibility of some kind of blaming in that one, just like in Riddle’s situation.
As for Jamil's situation, although not Jamil's sibling, Yuu's still part of the Asim family and Jamil technically has a resentment for them because of, well, everything. He was forced to downplay his abilities and be responsible for Kalim, and he has no choice but to serve the Asim family. Kalim himself might not have a problem with Yuu, but Jamil sure does because there’s another person from the Asim family. Another person he has to be responsible for because they seem to be just as careless and reckless as Kalim, even if Yuu is technically older. (Someone stop me, please, I am becoming feral. I can’t stop thinking of Jamil getting a huge crush on this Yuu for some reason and I am internally screaming. He really gonna do the enemies to lovers arc after his overblot, or even before that, and I just can’t. He really said: ‘If I can’t get out of this family, I’m just gonna have to marry into it.’)
Then we have Vil. Yuu would definitely be a big contender for the most beautiful one of all and Vil is not happy. Now that he’s realized that he actually had a sibling, he has to compete with them to be the most beautiful. And he just can’t understand why he’s losing to a sudden sibling he hasn’t even met until now! What was so different between the two of them? Yuu wasn’t even that active in social media before but now that they were staying in NRC for some reason (for plot reasons), people were now beginning to constantly compare the two of them and it’s driving Vil insane.
As for Idia, after seeing the reason why Ortho got diagnosed with the dead, there’s also some blaming there. Yuu’s supposed to be one running the S.T.Y.X organization but both Idia and Ortho (the og) got inside and managed to hack the system. This’ll definitely raise the question of why the two were allowed entry easily when there were dangerous things locked inside the place and why Yuu wasn’t keeping a closer eye to them when they were in the facility that led to the accident. 
I might also have to retcon the previous Idia!Yuu's background to fit with Shroud brother’s story. So now the idea that I have is that Yuu was present for the brother’s childhood growing up (kind of) but they didn’t have a close relationship and it was very distant. The Shroud brothers probably don’t remember Yuu, either. They probably thought Yuu was just an employee in S.T.Y.X. and not their sibling. Still, Yuu cared for them so much that when the incident happened, they were overwhelmed with grief and willingly locked themselves away because they fully blamed themselves for what had happened.  The only reason they broke out of their self-imposed prison and landed themself in NRC was because they heard Grim talking about Ortho as if he was alive and wanted to see what was up with that. Yuu doesn’t want to show their face to their younger brothers because they’re ashamed and feel like they don’t deserve it.
Then we have Malleus. I don’t know if he’s the jealous type or not, but seeing your older sibling be more sociable than you (somehow, even when they act like a kuudere) and getting more friends than you despite the fact that they’re the older Draconia sibling while Malleus himself was avoided and have had people fear him would be kinda frustrating. It’s another case of ‘what do you have that I don’t?’ thing. Or maybe the others are taking Yuu’s time away and they barely hang out with Malleus and he finds this unfair because Yuu’s their sibling so why is everyone taking them away? Why isn’t Yuu hanging out with them?
Additionally, we can’t forget the fact that Yuu literally go against the boys. There’s bound to be some feelings of betrayal there. Kinda like a. “We’re family and you’re taking their side?! Why are you abandoning me for them?!”
[Bonus]
Yuu Rosehearts: “I wish I had been strong like you….”
Yuu Kingscholar: “Don’t make the same mistakes as I did and be better than me.”
Yuu Ashengrotto: “Was all of this… my fault…?”
Yuu Schoenheit: “Because to me… you’re always my number one!”
Yuu Shroud: “All I ever wanted in my life was to protect you...”
Yuu Draconia: “I had to leave you to keep you safe!” 
Yuu (Al-)Asim: “…”
Yuu (Al-)Asim: “I have no idea what I’m doing here but I think they need therapy.”
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