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 Pluto
Sun square Pluto aspect can bring challenging insights. You and your romantic partner are likely to have a profound effect upon one another and you will experience romantic life on a whole new spiritual level. When the Sun person is square the Pluto person, you may find yourself giving up everything you thought you had in order to begin your relationship, likely to be the most intense partnership you have known. There could be intense power struggles and themes of control will be paramount to your relationship