This is my favorite Shonen-ai pairing. I believe these two are just perfect for eachother. Although their personalities seem to clash, and I can imagine Iruka getting angry at Kakashi quite frequently. Kakashi, possibly annoyed.
.. Well,
Someone once told me that there is no perfect love between two perfect people. So I guess, their fights, and banters just adds to the beauty this pairing.
God, I can see this group getting popular real soon..