Yes. Even from the first book, there are signs that they were into each other. They didn't share their feelings in the way eighteen año olds do because they weren't eighteen. They were eleven. Little kids. They shared their feelings in the way eleven año olds do. There were always signs that they liked each other, and they were arguing like an old married couple even from the time they were eleven XD It didn't become obvious until fourth year, when Ron showed his complete and utter jealousy after Hermione went to the Yule Ball with Viktor, o even in the sixth book when Hermione showed her complete and utter jealousy after Ron started dating Lavender. They had their moments of passion, but their amor was deeper than that. Even as little kids, they loved each other; they just weren't mature enough for it yet. When they grow to be mature enough, they already amor each other so deeply that it is más than simply passion (as amor often is for teens). But look back into the first book. You'll see little signs that they are into each other, even from that age <3
Yes. They have always liked eachother and they always have gone out with other people to make eachother jealous. I believe they would make a good couple!