Hi!
I'm trying to remember a fiction where Justin accidentally found out that Brian had fucked somebody on a copy machine ( in Chicago, while trying to win Brown Athletics' account).
What made it a big problem in their relationship is that Brian and Justin were planning for a while to fuck on a copier (apparently it's been a fantasy of Brian) and Justin felt betrayed.
I believe the story is AU, where Brian is more open with his feelings and recognise their commitment, but is still Brian - something like Miss Miko maybe?
Ring a bell?
Thank you in advance,
Nadya
Edit: FOUND thanks to ldl1759 - it's "The New Busboy", by waytotheend.
https://m.fanfiction.net/s/6483980/1/