The TRUE premise is: the fake dates were real and Shouto has been making out with his brother on the clock and has no intention of letting them have him, not forever at least. Dabi is absolutely going to find out and misunderstand? And Shouto is gonna be confused. I'm having so much fun?

He's mentally picking out a bigger place, so Touya can have room for his belongings and hobbies. He's using his days off to shave and wax. He has a curated list of restaurants from foodie friends. They think he's just locked in.

Obviously, their response to this is to be like, "Dabi, the brother you're obsessed, with has a crush on you. We need you to date him as bait to lure him in for capture." The unfortunate part for them is that Shouto stops listening after "We need you to date him."

The premise is this: fake dating AU. Years down the line, the heroes get intel that word on the street is that Dabi has a twisted little thing for his baby brother (I have no idea why this is the case? I'm just leaning hard into "crack treated seriously").