You should add Ax/Marco. I don't ship them, but there were a few times when it seemed as if the author(s) were.
I'm paraphrasing, of course, but do you remember something like the following?
Seating arranger butler guy: (to Ax and Marco) I'm sorry, but there's only 1 seat left.
Marco: It's okay. We're very close friends. (sits in chair and pulls Ax down onto his lap)
Very close friends? VERY close friends?
EDIT: I guess you guys beat me to mentioning this pairing. I should have read the other posts.