Sun, Saturn hard Aspects in synastry, can make you feel like you are on the hot burner. You are much more conscious of your behavior around the Saturn for fear of painful critique.
If played out positively the Saturn person can help the Sun person refine their personality, or the way they present themselves to the world, or if the Sun is much younger help them grow up. However, in the negative it can show up in the form of suppression, criticism, censoring, callousness, meanness, judgment, and suppression.
People need encouragement to be more confident and to grow, however, there is something about Saturn that does not go about things this way, that's more Jupiter's role. Saturn is serious, and this is especially true if the Saturn person has Saturn in aspect to any of their personal planets.
Saturn in synastry seems to restrict the natural expression of the planet he touches, and comes off critical or suppressed in the hard aspects.
The positive aspects such a the trine or sextile are much more productive because although they have standards, they don't try to force you into them, by being negative or critical.
If you have other pleasant aspects such as Sun + Moon or Sun + Venus, then these can certainly help by adding just the right touch of pleasure to the environment.
If the Saturn person does not have hard aspects from Saturn to any of their personal planets than it is likely the more positive side will play out, where the couple will be supportive of each other's growth. This could also simply indicate a large age difference between the two and the Saturn person plays the more serious adult/parental role in the relationship.
Even so, Saturn hard aspects work best with partners that either have hard Saturn aspects themselves or are a Capricorn Sun, Moon, Venus or Ascendant, where the lack of compliments, affection or positive support wouldn't be as necessary.
The Saturn person can come across as the authoritarian, may be bossy, cold or suppressive in some way. The problem is that the Saturn person wants the Sun person to behave differently, or is not as confident as the Sun person, and in some cases the Sun person is just plain immature.
Truly in the end, All of this depends on the personal natal charts of the individuals in order to truly depict how this aspect will play out in synastry.
In general, there is either a warm, safe feeling with the person or a suppressive, critical feeling.
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