You emotional connection runs deep and intimate. You might even have a psychic bond that allows you to communicate without speaking, or know what the other is going through even when you're not together and able to talk about what's going on in your hearts and minds. This bond is more spiritual than sexual -- which, in the end, could be more satisfying.
The feeling of closeness and kinship between you makes you feel like you've known each other for a long time, and it makes it very easy to get close and imagine a continuing romantic future together. Just be sure to stay as grounded as possible. Though it's wonderful to feel so well-understood from the very start, it could be that a large part of this perception is illusion. You'll find that you do have a lot in common, in terms of your views of the world in general, your likes and dislikes and so on; but you could wake up from this pleasant dream of your perfect togetherness and realize that you're actually two individuals with different needs and ambitions. As long as you keep yourselves grounded, this shouldn't be a huge problem. If you have other, more grounding aspects between you, they should help a lot in mitigating this influence.