~first~ and ~second~, all numbers divisible by 3 have several things in common. Primarily, they respond to the physical, emotional, and spiritual needs of others. The 6 (~first~) expresses this in the love and care shown to family and friends. The 9 (~second~) directs its attention to the greater good - to humanity at large. 

When the 6 and 9 are found between romantic partners in this part of the chart, compatibility is automatic. Both of you are self-sacrificing, giving, and caring people. ~first~ is more practical, ~second~ more idealistic, but your motivations are similar.

One attribute you share is your sense of justice; both the 6 and the 9 have a strong awareness of right and wrong, this could lead to one or both of you getting involved in politics or becoming activists or advocates for a cause. Unless you happen to be on opposing ends politically, this trait could further strengthen your bond.

Creativity and an eye for beauty are other aspects you have in common. Oddly, this is often a source of trouble for this combination. There will be times you have similar views when it comes to decorating, for example, but you will also often differ. When it comes to creative matters you will both have strong opinions. In the event of a disagreement, you will need to compromise (something you are both quite capable of doing).

Although you are generally highly compatible, there are areas where you are likely to clash if certain negative traits are not acknowledged and kept under control. Although this is not common in your combination, it is something to be aware of. ~second~, although idealistic and self-sacrificing, the 9 has the potential to become arrogant and self-righteous at times. Recognizing the relative value of your concepts and ideas may not be your strong suit, which could lead to putting others down if they do not share your (elevated) viewpoint. If this tendency is combined with extreme religious belief the 9 can become a negative influence on others, even destroying a relationship with the most devoted partner. Accepting that the 'truth' as we understand it is still limited allows us to have compassion and tolerance for others. The 9 is the least prejudiced of all numbers, so the likelihood of this being an issue is not high. But, as with all human traits, its dark side tends to be the direct opposite of its light side.

~first~, although your 6 is considered the most loving of all numbers, it has a dark side as well. The 6 can become intolerant and angry, often without a clear cause. Irritation and anger can fester, just waiting for the right opportunity to appear. The 6, although sincere, can also be intrusive and meddlesome to an uncomfortable degree.

~first~ and ~second~, the negative side of the 6 and the 9 are rarely displayed, but you will need to be mindful to prevent them from spoiling what is most certainly one of the best relationship combinations around.