lol they dont need to come out and say it, its obvious all on its own. also not only that but this way the people who aren't into yaoi can still think of them as friends, and people who like yaoi can think of them as a couple. then you have people like me who cant really decide at all. but its safe to say its pretty canon, just type in Kurogane and Fai Clover, that scene makes it so obvious ^_^
actually i really disliked yaoi until i found this couple! i still don't really like yaoi but i will make an exception for these two lol. im still on the fence about it, but i also kinda go all fangirly when i see any amv or read any fanfic that pairs them as a couple lol.
Personally I'm for KuroTomo (Kurogane x Tomoyo) since he's the only person that calls her "Tomoyo" in the whole manga. Everyone else is "Tomoyo-chan" or "Tomoyo-hime" or something, but not our Kuro-pii. To be fair they do match up like other CLAMP couples. Prime example: Toya x Yukito. One of CLAMPs 'soulmate' couples, always seen together, widely accepted that they're totally in love. Don't the personalities match up? Kurogane and Toya (less oblivious than they seem~), Fay and Yukito (cheerful and affectionate). Then you get Watanuki and Doumeki... I'll say no more.
Someone I know is more for Doumeki x Himiwari, working on the assumption that Doumeki's gift would counteract Himiwari's bad luck, which would be very nice for Himiwari. I've always been a fan of FayMoi, myself...Ha, get it?