The composite Moon in the first house makes clear that in this relationship your feelings and emotions are very prominently involved.
Obviously, this placement is favorable to any relationship in which you want to relate on a close, intimate level.
You have a deep emotional understanding of how you get along. But the Moon can also create such a strong emotionalism that you are unable to stand back and look at yourselves clearly in terms of your relationship. Be careful to avoid such extreme emotional involvement.
A first-house Moon should give the two of you a strong sense of emotional compatibility. You will feel that you belong together and that you have much in common, which will indeed be true.