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Snoke is the reason Kylo and Hux never got on. He was the one who pitted them against each other so that they would strive to beat the other, so when Snoke is out of the picture their relationship becomes very different.
Ren succeeding Snoke as Supreme Leader has always been Hux’s worst nightmare, and he’s always been convinced that the knight would just make his life more difficult.
In actual fact, Ren as Supreme Leader makes Hux’s life a lot easier.
He finds he’s not quite as afraid of Ren as he was of Snoke, and he finds it a lot easier to convince Ren to do what he wants.
Ren, as it turns out, is more insecure about his leadership skills than Hux would have imagined. Kylo has always operated alone, and apart from with the Knights of Ren, has never really held any form of leadership responsibility. He’s no General. He can’t command.
Kylo needs help.
So Hux helps him. Reluctantly, at first, simply to keep the First Order functioning. He gives advice to Kylo in a way he never felt he could with Snoke. He tutors Kylo on how best to communicate his orders to his men, how to build morale among the ranks.
For the first time, they work together. The mistrust that Snoke built between them slowly fades, and Hux finds he doesn’t mind providing support to Kylo. In turn, Kylo builds his confidence as a leader and starts to proactively seek Hux’s opinion before he makes decisions.
They find they actually get along with one another.
They appreciate each other’s skills and brilliance, and fall into a steady rhythm with one another. They celebrate their victories together and comfort each other over their failures. They find they don’t really blame each other like they used to.
The flirting starts without either of them really noticing. It begins with sarcastic banter, which turns into friendly banter, which turns into compliments.
They’ve always found each other physically attractive, even if they’d never admit it. But something changes between them on an emotional level.
And then one day Kylo starts to doubt himself again when the Resistance slips through their fingers once more, and Hux finds himself comforting the younger man and assuring him that he’s the finest Supreme Leader the Order has ever had-
Which leads to their first kiss. Which leads to them falling into bed together.
It’s awkward at first, as neither of them have had a real romantic relationship. And Kylo is incredibly inexperienced.
But they agree to try and make it work, because there’s no one to stop them and they deserve more in life than spending every cycle working.
And that is the story of how Kylo and Hux become the First Order supercouple of the century