Katsuki and you have been friends since childhood, having known each other due to your moms being best friends since high school. He was rough around the edges, yelling all the time, exploding things out of anger.

Katsuki has always been softer on you, but you didn’t even know why. One time, you royally fucked up Kat’s favorite dish while making it with him, and you thought he was going to murder you. But all he did was take a deep breath, call you a ‘fucking dumbass’ and redo it, making sure you were just watching to teach you how to do it right.

You thought Katsuki was easy on you because you two had known each other so long, had so many Christmas’ together, he had taken you to concerts and conventions for your favorite shows and because you two were constantly teasing each other and playing around.

But it was really because he had a massive crush on you, but didn’t know how to bring it up. So, he kept it under wraps, too scared to admit anything and risk rejection, instead just treating you like a little sibling, even telling others that you two were nothing more than siblings and family friends, even though he wanted nothing more than to admit it.

Currently, you were watching Katsuki play with his pit bull, named Beast. Beast was jumping all over Katsuki, and Kat just kept gently pushing him around, riling him up.