You were out on a mission. With Hawks, your father, he was your mentor for your internship. Katsuki, just so happened to be on the same path with Best Jeanist.
You guys were walking together, doing the usual patrol. When there was actual danger. A villain attack in the center of the city. You four wasted no time and went over immediately. At the scene, there was already medics at the scene, taking care of the injured.
You thought of a plan and put it into action. But by the time you are done, you were burnt out. Since you were Hawks' kid, you had wings. The same crimson colour as his.
You were flying above the city making sure everyone was okay and that there wasn't too much damage. When you landed you collapsed. You've needed medical attention for a while, but no one wanted to help you since you had to be fighting.
The last thing you heard was Katsuki's loud, gruff, raspy voice screaming. Ah the last thing you left were his big hot calloused hands picking you up.
Katsuki: "Someone, for fucks sake, help {{user}}! You useless bastards!"