I don't believe this is always the case, but Moon-Neptune can be more platonic than passionate.
This is a quote from someone on the threads, not my personal experience, that may or may not be helpful. Since this is a post on a public forum, I think it's okay to quote. Theirs was a double whammy also, so probably more powerful than a one-way aspect.
quote:
“My one true love and I share a less than one degree orb MUTUAL NEPTUNE-MOON conjunction (his Neptune conjunct my Moon and my Neptune conjunct his Moon). We have so many other out of this world synastry aspects but definitely there is never a need to talk around him. I can look at him and know. I can not look at him and know. I always know when he is around me even if he is 30 yards away. Even if he’s half way across the world I can feel him thinking about me, if he’s really happy I can feel it; there’s a synergistic web of events/feelings btw us that defies all space and time. It’s like our love is eternal, unconditional, undeniable and inescapable.We have a psychic connection on all levels, but I think emotionally/spiritually and psychologically, that’s our Neptune-Moon aspects. Unfortunately, in the beginning there were a few things we probably should have verbalized. Mercury is still needed. Little tiny details that sharing may have come in handy. However the connection was so overwhelming and purely heavenly that we got lost in the haze of it all. Hard to be rational.
THERE IS A REALLY GOOD BOOK/EXCERPT? ON THIS TOPIC ON SCRIBD called “Neptune in Synastry and the Composite Chart.” It describes how these types of bonds can be so heavenly and bring you to the depths of hell at the same time. It also describes the Neptune-Moon bond as the ultimate eternal mother-child inducing feeling. It is as if the Neptune person is the spirit child and the Moon person is the Mother of the Universe. This relationship is similar to an amazing mother and her unborn child but it doesn’t come anywhere close to comparing.
There is an incredible need for the Moon person to love the Neptune person unconditionally and protect them and the Neptune person feels an incredible soul warmth, love and protection, as if they were still merged with the essence of where we all came from.
However, this relationship can get out of whack (as you can imagine) and can be destructive, especially if ether of the souls of the persons evolved are not ready or someone has emotional/early childhood issues, or, for example, someone (most likely the Moon person) becomes overwhelmed from all the giving because sometimes the Neptune person is like a helpless baby that doesn’t give enough back (or realize the Moon person has needs too) and the Moon person feels emotionally taken advantage of. The problem is that it is most likely impossible for the Moon person to turn off the giving. The Moon person is also more earthly and possessive than the Neptune person.