Sun Square Neptune love Synastry ~ Superficial Attraction
The Sun is the source of all energies. These energies stimulate the activities of the houses occupied by the transiting Sun and reinforce or weaken the planetary effects, depending on the Sun's aspect to the natal planet. When the Sun transits an inner planet, it may trigger a dormant aspect between that inner planet and a slower moving outer planet. If a planet is being transited by another planet when it is being transited by the Sun, the effect of the transit is strengthened.
Sun Square Neptune
A Sun square Neptune aspect often seems to promise more than it delivers. Attraction may be based upon appearances, which may lead to romance but have a hard time in the cold light of day and a very real but different person emerges. Psychic and creative as it seems, each party tends to glamorize the other. This challenges the idea of long term domestic commitments made under this influence. When the Sun person is square the Neptune person they are just as likely to see the partner their wants rather than understanding you and your desired relationship in your terms.