Scorpio and Aquarius square off at 90 degrees, and it's a clash of two immovable objects - both are Fixed signs, both convinced of their own position, and neither remotely inclined to bend. Add the gulf between Water and Air and you get a pairing that's magnetic and genuinely difficult in almost equal measure. Scorpio feels its way to the truth; Aquarius reasons its way there, and each distrusts the other's method.
The real fault line
The emotional registers are the real fault line. Scorpio wants intimacy, merging, and total loyalty; Aquarius wants independence, friendship, and a certain cool distance from strong feeling. Scorpio's need to bond deeply reads as suffocating to Aquarius; Aquarius's detachment reads as cold or evasive to Scorpio. Because both are Fixed, a disagreement can harden into a months-long standoff, each waiting for the other to give first.
Scorpio and Aquarius in love and friendship
In love the fascination is strong - opposites of temperament often are - but it demands enormous tolerance for difference. Scorpio must accept Aquarius's need for space; Aquarius must accept that Scorpio's intensity is a form of love, not control. As friends the fit is easier and often intriguing: Aquarius broadens Scorpio's fixed obsessions, Scorpio gives Aquarius's ideas some emotional weight, and neither bores the other.
Beyond the sun signs
As ever, don't let one angle decide it. Two suns are a twelfth of the truth at most - the Moon contacts, the Venus signatures, and the aspects between two whole charts carry far more of the real chemistry. A Scorpio and an Aquarius with kinder contacts elsewhere can make the difference work and even relish it; the square just guarantees they'll be negotiating across a wide temperament gap.