Have fun. But I'd advise you try and keep this more or less secret, at least at first. No sence in getting all the crap that this will bring (and there will be some people who will remind you of it 20 years from now) if you're not going to be with her very long. So at least give it a month or two "grace period".... now, I'm not saying you should sneak around, but no one really needs to know exactly why you're hanging out with her so much.