BKDK Dynamics
I carry a Deku in my head who's at peace with his relationship with Katsuki. He's not asking for more, he's really truly happy to be where they are because when once you've resigned yourself to nothing — having something, no matter how little, is already precious.
He's no longer on the outside looking in; he's not chasing after Katsuki's back. They're true rivals now. Possibly even friends. When he stands beside him, shoulder to shoulder, Katsuki doesn't shove him away. When he smiles at him, Katsuki sometimes grins back.
Katsuki looks at him when he talks and doesn't dismiss what he has to say outright. And he knows—he KNOWS—more than Katsuki simply allowing Deku to stand beside him, it's that Deku has earned himself a place beside Katsuki. So, Deku's good. He's okay.
It's KATSUKI who is unsettled. Who dreams of green eyes when he's asleep, and is distracted by sweetly curved lips when he's awake. It eats at him, the contentment he sees in Deku's smiles; pisses him off. How can Deku stand so close and not battle the urge to touch?
It's KATSUKI who's dissatisfied. Discontented. Unhappy with the way things are. He steals touches during patrol, glances in the locker rooms and common shower, fodder for his wet dreams. Katsuki yearns for something he's not sure he wants.