Dabi never really liked Hawks. He talked way too much to be natural, displayed very little personal information to be trustworthy and talked in that phony I'm chill and have no worries whatsoever vibe that irritates the hell out of him.
Hawks also had a strange fascination with Endeavor. Which he discovered because actually it's the most obvious thing in the world if you spend two seconds with the man.
Dabi thought it was disgusting, yeah, but he could maybe forgive that.
If his father didn't like him back.
Hawks says he'll get a date with the man. As if. Dabi knows his dear father, his worse attribute is team work.
But Hawks somehow manages to get Endeavor to travel all the way up to Fukuoka, and it pisses Dabi off. He gets Endeavor to listen to him, to pay attention, to make an effort. Then they fight together and Touya is fuming.
He wanted High End to beat the shit out of his father and instead he witnessed things he wishes he could unsee. Disgustingly synchronized team work. Just because those stupid wings of his worked so damn well with fire when they shouldn't. And he knows his dad is impressed with Hawks' quirk and skills.
He remembers the training room all that long ago, remembers dreaming daily about defeating bad guys side by side with dad. Because dad was so strong and so cool, and everything he dreamed to be one day.
But dad said he couldn't. Dad said he wasn't old enough. Powerful enough. Dad said they would, though. He promised.
And there was nothing like the look on dad's face when he used his fire. It'd light up as the flames were reflected inside his turquoise gaze. His eyes were the spotlight and Touya would give anything to keep them to himself.
Except he originally thought Shouto was the only one he needed to envy. There's so many people now. Sidekicks, those irritating pupils of his, and fucking Hawks too.
So he wants to ruin him. To make him broken beyond repair. Then his dad won't even bat an eye on him anymore. Quirkless little bird. A broken toy.
He succeeds brilliantly and makes the bird useless, turns wings to dust, confidence to shreds, reputation on the mud.
What kills him inside, even though he's sure he was already dead long ago, is that his dad doesn't seem to mind. He looks at Hawks as fondly as before. He likes him without his wings just as much. He likes him even though he's a filthy traitor. He likes him anyway and his eyes still shine for him, the way they never do anymore for himself, not since that long ago.