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Call Leo unreasonable, which he very much was, but he didn't like this, not one bit.
You see, it sounded silly, but it was actually super serious! Donnie had randomly given himself eyebrows one day, it was.. weird, and funny, but fine. It fit him after all, and while he'd still be Donnie without them, it just wasn't the same.
Later, Raph also drew on eyebrows. That was weirder, but Leo didn't question it like he did with Donnie. It was probably just because he also liked them or something. That wasn't a big deal, and if they were pleased with it, Leo was too.
But then, things started to happen. Silly Serious things, but things nonetheless.
Raph and Donnie started.. communicating. Not talking, but just looking at each other and knowing what the other meant. It irritated Leo sometimes, but mostly, he just felt.. betrayed? Over what, he didn't know, but he just did.
Talking that way was something he and Donnie did. It was supposed to be another Twin thing they could do, understand each other with no words needed. But now, suddenly Raph and Donnie were doing it. It didn't feel right.
But it didn't end there. Raph and Donnie started syncing as well. Talking at the same time, saying the same exact things, and it didn't matter what it was. It got even worse when Raph started saying the smart stuff, while Donnie just simplified things. Whenever Leo would ask about it, they just said it was a Big Brother thing.
That was wrong.
That wasn't how it was supposed to be.
That was a Leo and Donnie thing, a Twin thing, it always had been. Never a Raph and Donnie thing. Leo and Donnie were twins. They were the ones syncing, acting like each other, saying things the other would.
It was supposed to be them.
Leo didn't know when he hit his breaking point. Maybe when Donnie and Raph started talking alone to each other more, or maybe when Raph said something random like an inside joke and Donnie would burst out laughing. Maybe when they kept telling Leo and Mikey that they "Wouldn't get it" or that "Big Brothers would only understand."
Maybe it was when Raph and Donnie called themselves Twins in front of him.
Leo felt betrayed beyond belief. He was supposed to be Donnie's twin. He was supposed to be the one with him telling jokes with him that his brothers wouldn't get. He was supposed to be the one talking to him all the time. Leo was. It was always supposed to be him–
Leo would never admit it in the future, but right then, he burst into tears and he didn't know why. It hurt. It hurt like hell. It felt like the worst type of abandonment, especially since he just didn't know why.
Was he not good enough? Was he too rude? Too obnoxious? Too annoying? Did Donnie think he was too dumb? Too weird? Did he think Raph was better? Did he think Raph was a better twin than Leo ever could be?
Leo didn't get what he possibly could have done wrong, and he hated every second of it. He hated that Donnie liked Raph better. He hated that he felt this way. And he hated that Donnie 'replaced' him. He hated that he was suddenly excluded from something that used to be exclusive to him. To them.
So, he cried.
Leo was mad and angry, and jealous and he hated he felt this way but didn't know how to stop it. So he just cried. Of course that has everyone worried, wondering what could've possibly have been wrong and got him to cry, but Leo didn't know what to say.
What do you say? That he's bitter? Jealous over something Donnie always told him wasn't true and always told him that it wasn't possible? Yeah, that's stupid. This is all stupid, yet Leo couldn't help but be hurt.
There were a lot of things Leo could get away with, but this definitely wasn't one of them. Crying suddenly in front of his brothers never would be one of them, and he'd have to say what was wrong no matter what.
That "conversation" was filled with a lot of, "Are you serious right now?"'s, and a dozen more, "You are so stupid Leo, oh my god–"'s, but one there was definitely things for sure in the end.
Leo was still Donnie's twin, admitted by Donnie himself. Donnie wasn't replacing Leo just because he was bonding with Raph over stuff now, which makes Leo feel stupid for looking so much into it before, and just because Donnie and Raph found more things they could bond over, didn't mean Leo was suddenly excluded.
Leo felt a little.. no, a lot stupid in the end, but he knew that his relationships with his brothers and most importantly twin were still secure, and that made him happier than anything.
Though he did get smacked by all three of them for being a "Dumb-dumb" as they all affectionately put it.
And this did not help Donnie see him as any less stupid than before.