Finn is one of Kylo's harem alphas, but when he falls in love with Kylo's beta advisor Rey, Kylo gives him leave to go ahead and marry her, and officiates at their very pretty wedding. (I just wanted FinnRey in this AU as well)
Ooh yes give me all the FinnRey!
And like Finn was a pretty new alpha so Kylo doesn’t mind losing him that much. Beside he has how many others to keep him company during his heats. And Rey is like his half sister (cousin? I don’t know she’s a solo-Skywalker) so of course he’s going to help her out. He organises the wedding, he’s got the money after all, and it’s a cute little ceremony like Padme and Anakin’s and it’s just adorable! Kylo almost cries. And Rey and Finn are the happiest pair in the world, always smiling and dancing and Kylo sorta wishes he had someone like that..