I did some research!This is what I found about the Composite - Moon in the 10th:
1) You have a strong feeling that you have come together for a purpose. To create something. You two will feel supported from the external world, appreciated, liked as couple. Even looked up to.
You could be a couple that shines and is popular in your social dimension. Imbalances in the relationship can show up in the public eye, is difficult to hide your emotions and the way your feel about each other is literally out there, whether you are a romantic couple or public enemies. (Anastasia Cosmic Astrologer)
2) You come across to others, as more serious and perhaps business like. You both are probably high achievers, in which you share a common goal on building things together. Passion might be slow since you are both much more focused on a long-term goal together. You will both be very reliable to one another, consistent and trustworthy. You will receive respect and admiration from others. Your love for one another will grow stronger with time. (Illume Astrology)
These two make much more sense to me. Depending on whether it’s a romantic relationship or something else, it seems like this aspect will give popularity to the “couple” when it comes to their feelings for one another.