On Special Lovers 4, its more difficult to describe about their relationship. Romantic but cruel, as we know Neji and Hinata were from the same clan and they were brothers. If it is really happen, so we could say this "Forbidden Love". But love is blind, they have been stay together in a long time at the same place, possibility they falling in love each other is very big.
Just like I said before, Its gonna be more complicated, I hope its gonna be wrong, because I don't know what is gonna be happen to Naruto if all person which he loved have their own soulmate. What a pity Naruto