Anonymous chatroom friends into "Oh...it's you"
Modern AU of fair length (10,000+), I think on AO3, M/A, rated sexy!times:
Merlin and Arthur are anonymous best friends on a chatroom and don't know it (i.e. anonymous). Turns out they associated in a business setting, book publishing/editor Arthur jilted Merlin on a book deal, and they hate each other (kinda). The chatroom buddies go to meet each other and instead of meeting who they think is the anonymous with the red rose and copy of Picture of Dorian Gray, they run into each other--book deal enemies--and angrily argue. Eventually they figure out that each other is the anonymous chatroom friend. And then they're in love of course and sexy!times ensue at I believe Merlin's flat.
Also, this is not "Chatroom" by neuroticnick (hint hint, that's a good one).
Thanks for the help