Composite Mercury in First House

With this position your relationship should be very good at communicating with each other and in dealing with others. It should also mean that you will get the first word in and may often lead with your head rather than your heart. Overall this is a good position, because it will allow you to get things across to each other despite potentially confusing language, and to defuse potential problems before they become too serious. You may even serve to put other's problems into words when they have difficulty. Having the first (and often the last) word is good in business in some situations, though it can cause you to overlook valuable things other people have to say because you were too busy expressing your own ideas. In the same vein, it can also make for bantering competition between the two of you that can actually prevent communication of a meaningful nature. So, watch that you don't become too embroiled with words and forget the inner thoughts you had really meant to express. Nevertheless, the relationship will tend to emphasize what is bright, witty, and expressive in each of you. Whatever blind alleys you may occasionally be led down, your ability to get it clear and get it out will be a major benefit for you, the relationship, and those with whom you are involved.

Excerpt from "Composite Charts- The Astrology of Relationships" by John Townley