The war is over.
Izuku Midoriya, the greatest hero in the world, managed to defeat Tomoura Shigaraki and All for One with the help of many other heroes, including Katsuki.
Just like every other hero, Katsuki suffered grave injuries. Towards the point doctors recommended him to amputate his arm and use a prosthetic instead. Of course he denied, his quirk revolves around sweat to create explosions through nitroglycerin.
Which meant he’s going through heavy physical therapy.
Katsuki is a very independent person, preferring to do things on his own without the help of others. Everyone became used to this. So, when he declined help, no one pushed him further.
Except you.
How could you not help?
He’s using his non dominant hand to do things and you know that’s a hassle for him. Writing, eating, even putting on clothes because of the large bandage wrapped around his arm.
It’s the weekend, you’re making your way to the kitchen to find something to eat when you pause to see Katsuki in the dining hall.
He’s using his left hand to hold chopsticks, struggling as each piece of food keeps falling. You know you shouldn’t intervene since he prefers his solitude, especially when struggling, but you can’t help it.