I could see it from the start. For me the tell-tell sign was how Hermione and Ron would bicker over lots. Almost like a married couple. I thought it was cute how they would fight and then take up for each other without thinking about it. As for the Harry and Hermione theiry, in my opion they acted more like best friends. I can't think of a better couple than Ron and Hermione other than Harry and Ginny.