Sun in the Eighth House
Composite Sun in the eighth house may give the two of you a feeling of "fatedness," that this relationship is going to play an important role in your lives, even if it is not a long-term relationship.
You will be exposed to the most basic and profound aspects of your own and your partner's inner nature. Both of you will experience psychological changes through this relationship.
In a sexual relationship, physical sex assumes an unusual importance. Sex is likely to be seen by both of you as an experience that transcends ordinary reality.
The eighth house is also the house of joint resources and property. This position can give the two of you a strong drive to acquire material possessions. Here again it is necessary not to overdo this emphasis. Emotional needs are actually more important than possessions.
Sun Conjunct Mercury
The conjunction of composite Sun and Mercury signifies that there will be a great deal of mental activity in this relationship. This aspect is good for verbal communication between you.
You both should be wary of the tendency to intellectualize your emotions rather than deal with them at the gut level.
You have an unusual similarity of thinking, or at least a better than average ability to understand each other's thinking.
Mercury is a planet of travel, not always in the literal sense of the word, but in the metaphorical sense; that is, you like to be continually exposed to new ideas and experiences together.
One of the most positive attributes of this aspect is the ability to be detached from what you are discussing. Because of this detachment you may even be able to talk about your relationship and arrive at understandings that will help you both to get more out of it.
Sun Conjunct Venus
The conjunction of Sun and Venus in the composite chart is one of the strongest indications of a love relationship between two people, even in a friendship. It does not primarily indicate a sexual relationship; instead it signifies love, pure and simple. The attraction indicated by this aspect is so powerful that it can bring together people who are incompatible by ordinary criteria.
If the relationship is laden with conflicts, even a strong feeling of love between you may turn to hatred. In most cases, however, this will be a very fine personal relationship.
Moon in the Eighth House
This is a position of transformation, which means that your relationship will undergo extensive changes, partly because of what you will learn about yourselves, partly because of the pressure of your emotions.
In addition, this placement of the Moon in the composite chart makes you very concerned with values. Your shared values may be purely on a psychological level, or they might exist more on the material plane as a great concern for possessions and property.
The greatest strength of this Moon placement is the contribution it can make to your self- understanding. Its greatest difficulty is the tendency to emphasize the heavy, moody aspects of your relationship and to dwell excessively on serious matters. Explore the new and constantly changing features of your life together, and welcome such changes instead of fearing them.
Moon Conjunct Mercury
The conjunction of the composite Moon and Mercury can contribute many strong and useful features to a relationship. Very simply, it means that the two of you can talk about your feelings instead of keeping them bottled up inside. The Moon conjunct Mercury may have two different kinds of effects.
If the lunar tendency triumphs, you will be able to discuss your emotional situations, but you will be very emotionally involved and subjective. On the other hand, you will really live and feel your emotions, so that something real is communicated between you.
If the mercurial tendency dominates, you will be more detached and rational but also less involved.
Obviously the best tactic with this aspect is to create some kind of balance between these two extremes.
Venus in the Ninth House
With composite Venus in the ninth house, love and affection tend to be intellectual issues that are discussed and pondered over rather than felt.
There is a danger that you may overintellectualize your feelings in this relationship.
However, in compensation, you both examine the nature of your feelings and are more capable than most people of understanding what you mean to each other.
The experience of this relationship may also make both of you see more clearly and become more aware of the world around you. Venus in the ninth house can signify love as an agent of consciousness expansion.