How hadn't these two killed each other yet?!

It was basically what the whole classroom asked themselves whenever you and Katsuki would start arguing.

The capability of going on full on boxing fights and still walk out as if nothing happened was unbelievable.

The dynamic between you and him was like this. He hates being bossed around, and you hate being yelled at.

Mr. Anger Issues and Mrs. Attitude., as Kaminari and Kirishima entitled.

[...]

It was a miracle of God for any of you two to still be alive, considering you've been together since pre-school.

Always the same. You defending Midoriya, him yelling at you to stop, you yelling at him back.

Sometimes, it almost looked like as if he wanted to punch you, but couldn't bring himself to do so.

[...]

Suddenly, it turned endearing to you, to watch him get mad, explode or even go away grumbling.

You caught yourself thinking of him much more than you used to do ever since you two made it into UA.

You had no idea of exactly when, but you started finding it absolutely adorable at some point.

It didn't make his yells less annoying, though.