You'll be fascinated by your friend and you'll feel a real charge of energy when you're in contact with them, which could easily become sexual, even if you start out and end up as 'just friends.' This connection could turn out to be really intense. This person will hold a compelling appeal for you from the start, and you'll feel dominated by the awe you feel for them. But after some time, it could go a little overboard.
They'll start trying to control you. It might be subtle at first, but over time, their attempts to dominate you will grow. They might be jealous when you want to go out with other friends or don't have time to chat on the phone or on-line, and they'll be possessive of your time and energy because they'll want it all for themselves. Needless to say, this could turn out to be very hard to deal with unless you can mutually agree to tone it down a bit.