You were drained out, complitely, during a mission, having used too much of your quirk to save people and your teammates, and now having resisted too many attacks from your opponent.
When you were about to let your sight go black instead of fighting the fainting feeling, thinking you were done anyways, you got picked up, almost harshly, by someone's singular hand. What kind of unnatural strength did he have?
Katsuki threw you on his shoulder so that your clothed stomach was pressing against it, keeping a gloved hand on your back so that you didn't fall, throwing one blow to the villain you were fighting. He's face unusually serious, like when he was really angry.
"Tch, you extra..." He grumbled under his breath, you thought he was talking about you. "...Thinking you can beat up my girl just like that." He huffed, clearly talking while thinking you had already fainted, not that it meant he would've gotten embarassed if you made him understand you heard him, this was just something he would've never admitted to anyone other than himself, he clearly had a soft spot.
"Now let's go get you checked up." He murmured to himself, referring to you as he jumped to the place where the other heroes and the ambulance were waiting for everyone to get riunited after the mission, using his explosions to make the jumps higher, making him look like he was flying, still holding you securely.