ok, i am going to say something different in here...
first of all, it is very necessary to keep the eye contact for a few more seconds, this is actually starting the game on!
secondly, i dont think breaking of eye contact has any negative effect, because in here, u show ur confidence by keeping the eye contact and you are taking it away which is in fact baiting her more into the game.
just remember, not to break it with a smile or any hi intantly. very bad! u will be very surprised to see how naturals work in this area.
eye contact + silence = sexual tension, and smile + talking = comfort.