Sun in 7th House synastry relationships are defined almost exclusively by their personal and professional quirks whose goal is to make the partners as close and similar as possible. The partners become reflections of one another, which allows seeing both the good and the bad. Ideally, this synastry should lead to a perfect balance and harmony, as any stirring on one side is absorbed by the other side’s counterreaction.
It’s easy to deduce that the Sun in Seventh House synastry prevails among happy married couples and best-friends-forevers. People who find themselves in this type of relationship are constantly drawn to each other, which manifests itself in a strong desire to spend all the time together, where “all the time” may easily mean the entire life should tender romantic feelings emerge.
from F. Sakoyan, L. Ecker
Sun in 7th House Synastry Explained
Synastry planets in the 7th House are akin to concave mirrors that reflect your image in a grotesque and exaggerated way (ironically, it helps you see yourself better). Alas, you may not understand it at all, especially when the partner’s Sun falls into your Seventh House. In this case, the partner’s will becomes so dominant that it distracts you from yourself, thus enabling you to perceive the partner as is (to the extent you are capable of perceiving the outside world).
On the lower evolutional levels, you fight the partner’s will (consciously or not), but the terms of the fight are unjust: you won’t be able to win no matter what, so any local victory turns into a defeat in the longer run. The reasons for your fighting the Sun in 7th House synastry partner’s initiative may be unclear to both of you, especially if your partner’s Sun is harmonious and does not fall into their own Seventh House. Yet your partner will surely perceive your hostility, and the relationship will begin to deteriorate unless you both try to help it.
What you need to understand under synastry Sun in the 7th House is that (1) not every initiative of your partner aims at humiliating you, and (2) many of those initiatives can benefit you. Then you need to realize that you are also playing some role in your partner’s life: therefore, their initiatives toward you mean something for them as well, and it is your job to understand what, exactly.
At the same time, your partner needs to notice that his or her will oppresses you and that your reactions are very personal, so it is in their interest to avoid putting direct pressure on you. The good news is that, as your partner’s Sun improves, the former pressure turns into care and attention. Also, keep in mind that any unpleasant manifestation of your partner’s will is a symbolical reflection of your own aggression, so it is on you to find and improve the behavioral program that causes it.
from A. Podvodny