Written by unicornsandbutane on Ao3. 

https://archiveofourown.org/works/19134916

So, the thumbnail was made by @givemeaknjoon, but they seem to have vanished off of the internet. So credit to them and look at their stuff if you can find some, it's really really good.

Denki’s maid fetish is something he’s nursed for YEARS. It started with manga with EGL themes, and progressed from there. He liked the maids the best, and thought at first he wanted to hook up with a girl wearing a maid uniform, to be her master and all that good stuff. He’d consume basically anything maid related. Browsing a manga scan site, he started reading a series about a maid serving a master who was allergic to girls. However, Kaminari didn’t realize at first he was reading the chapters out of order, and the maid was actually a cross dressing boy... and the whole series was solidly BL. It put the idea in his mind though, of being the one in the maid costume... and pretty soon he realized how badly he wanted a pretty maid dress of his own. There were plenty of cheap ones, but what he really wanted was something that made him feel like he was the loyal maid of a master who could afford the best. It took a lot of saving up, but eventually, he managed to make his way to Harajuku, where there were lots of stores selling exactly what he wanted. He’d psyched himself up for months, planning this excursion.

 He did not expect to see Shinsou Hitoshi manning the counter in a Lolita fashion boutique.