Uranus wants love that surprises and gives room to breathe. The Moon wants love that shows up every day, predictable as tides, holding what it holds. That is the first thing to understand about this pair: one of them is trying to keep things open and the other is trying to build a nest, and neither is wrong.
Cancer will remember the anniversary, cook the meal, ask how the doctor's appointment went. Aquarius will forget the anniversary and then make up for it with something nobody else would have thought of, a stargazing trip on a random Tuesday, tickets to a lecture Cancer mentioned wanting to see months ago. That gesture lands, but it does not replace the small daily tending Cancer actually craves, and there will be a real conversation, maybe more than one, about why "I love you in my own way" does not always feel like enough at ten at night when Cancer wants someone physically present.
Saturn gives Aquarius a strange kind of steadiness underneath the eccentricity, which helps, because Cancer needs to know the ground will hold even if the person standing on it keeps changing shape. What Cancer offers in return is real warmth, a home that feels lived in rather than theorized about. Aquarius can talk about humanity for hours and forget to check on the one human in the room, and Cancer will call that out directly, probably while doing the dishes, probably more bluntly than Aquarius expects.
The cardinal drive in Cancer wants to lead the emotional life of the relationship; the fixed stubbornness in Aquarius will not be pushed. Neither one bends easily, but if they respect the pace difference instead of fighting it, they build something genuinely rare: a private world Aquarius didn't know it wanted and Cancer didn't know could stay so interesting.