Surprisingly, there was one person who believed Kakashi, having been in the same class as those two, he had seen it coming from day one. This person was the 'lazy genius' Shikamaru. He didn't have to like it though, sometimes his brain drove him mad, when looking back at missions he had with the konoha twelve, there were too much hints of romance between his fellow ninja.
The possibilities were endless, he had more luck finding a couple by throwing names in a hat and randomly picking two out.
For the sake of his brain, he wouldn't risk it.