Though of course you connect as lovers, your attraction for this person could have roots in a feeling that's both spiritual and nurturing, because you truly understand their emotional needs on a very intimate level. You're tuned in to their family or close friends from the start; either you meet them right off, and instead of being an intimidating or tense experience, it feels like something clicking into place, on both sides; or you help them to bridge any gap there might be between them and their family -- a gap created through time, space, hurt feelings or what have you. You might help this person to create a family tree, to negotiate disputes, or you might even just spend time listening to this person talk about their childhood, about their relations who might not be here any longer but who still live large in their memories.
You understand where they're coming from perhaps better than their other friends can, because there is a real feeling of commonality between you -- even if you come from different cultural backgrounds or upbringings. You just get what your lover needs to feel loved and supported. Needless to say, if your relationship is a long-term one, this aspect greatly supports that energy and bond.