I have this now and know exactly what you are talking about. It is a very primal attraction, obsessive and compulsive, something I had never felt before. His moon falls in my 8th, but we also have a tight double whammy of Moon opp Mars, besides other hot aspects such as Venus opp Pluto (although in a wide ord).
I can barely breathe when I am around him. It is hard for me to concentrate on what I am saying even. I just feel there is this powerful magnetic pull that is capable of blurring my best judgment of what is rational and proper. It's like he brings out everything that I effortlessly manage to hide from other people and I feel exposed, vulnerable to him, helpless in my attempts to take control of myself. I often feel that I'm on the brink of losing it.
Our meetings are therefore often very awkward. The feelings are very much on the surface, so I can feel he is uncomfortable, too, and he does things that seem very impulsive as well. The thing is: he is married. Had he not been married, I don't think I would have waited for him to make the first move. It is so weird because at the same time that I feel uncomfortable and like running away, it also feels so good to be with him that I just don't want to leave. Or maybe that is my sun in his 5th house that adds to this.
On an additional note, I often dream with him, too and wake up with the feeling he is there.