Katsuki couldn't stand it. Ever since the war ended and All for One was defeated for good, fans had been coming at him left and right.
He wasn't used to the attention and he didn't liked it!
He was tempted to yell at them to fuck off, but so far, his scowl, evident disgust and lack of patience for his fangirls hadn't pushed them away.
So, against his better judgment, he decided that extreme situations needed desperate solutions.
And boy was his solution desperate.
He felt absolutely humiliated, coming to you for help, and worst of all, asking to fake date to drive away his fangirls. It was a fair deal, you'll get something out of it and he'll get his peace back.
You were reliable enough for him to know you wouldn't screw over the plan or catch feelings. But now... now he felt stupid because he was the one who catched feelings for you.
What was he supposed to do now?!
What he knew best: play dumb and silently enjoy the 'relationship' you both had... though he wasn't sure how long he'll manage to keep his feelings to himself.