I think it's interesting looking at the relationships on AO3 for the White Collar fandom. The show has two lead characters, Peter and Neal, who solve crime together and the focus of the show is on the close friendship between them as they figure out the case of the week.
So the top relationship is Peter & Neal with 2874 fics (& not /). Perfectly understandable and expected given the subject matter of the show.
Now I would expect the next relationship to be Peter/Neal. From every other fandom in existence that features two really close guys as partners at the heart of the show, I would expect that to take the second place spot, but it doesn't. Peter/Neal takes third place with 1760 fics.
Just nipping in above it with 1776 is Peter/Elizabeth, pairing Peter with his in-canon wife. So, so many fandoms would side-line the wife in favour of the slash pairing. But not here. Here, she is half of the second most common relationship.
And in fourth place, we get Peter/Neal/Elizabeth with 1294 fics.
There is a fandom where a significant number of the fans looked at the main characters and went, "So they're a throuple, right?" And, honestly, same.
