When I say that Black and Geode's relationship is a slowburn I mean it is a slooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooow burn
You gotta remember these guys are dead for eternity. They are where they are now forever. Which means they have a LONG time for events to occur.
A huge reason why they began to like each other at all after trying to kill each other and fighting for a long time is because they spent so long together. Yeah, it was to hurt each other (or a subconscious motive to hurt themselves, at least for Black), but then Geode gave Black the harsh wound on his neck and realized suddenly that he doesn't want to kill Black, he doesn't want to lose him.
In a weird and twisted way, they were the only ones that were ever there for each other, the only ones they had
And it's weird for both of them because they're like "wtf do I like him now?? Why??" and it confuses them even more when the feelings turn romantic against their wills.
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Say, for example, a she-cat from one of their Clans had kits by the time they met. Those kits would be elders by the time their feelings turned into a crush. And it would still be a while with self-healing and long talks before an actual relationship began
