Pluto inter-aspects in synastry (one person’s Pluto aspecting another’s planet) can be some of the most intense contacts around. You would think the Pluto person would always have the upper hand, as the other person is overwhelmed, magnetized or helpless in the face of Pluto’s dark draw. Sometimes this happens, but other times what occurs is much more complicated.
Pluto (the ruler of Scorpio) is about penetrating to the core of something to understand it. It’s an expression of personal power via exploration of “the target,” as the Pluto person ultimately seeks to understand themselves. There’s often a thread of manipulation running through these contacts, as the Pluto person does whatever they can to achieve complete intimacy with another.
But Pluto’s power can turn around and bite the person who wields it. Pluto/Scorpio represents the Shadow: the fears/compulsions/obsessions that no one wants to deal with. We all have a Shadow, but for people with strong Pluto/Scorpio in their charts, it’s imperative that they confront it (because it’s dominant). How they manage this power in their life will decide how they handle synastry contacts to their Pluto. They can embrace it as a vehicle for personal evolution, or they can use it to manipulate and fixate on people/situations. Note that a strong Pluto/Scorpio natal signature involves one or more of the following: personal planets (Sun, Moon, Mercury, Venus, Mars) in Scorpio, Pluto aspecting a personal planet, Pluto on the angles, Scorpio on the angles, or personal planets in the 8th House.