Kylo Ren has been captured by the resistance/has defected. A lot of people want to make an example of him and have him executed, but when it's discovered that he's an omega, Leia realizes that there's a way to save him: Since omegas are rare and valuable (insert bullshit reason here), Kylo is more worth to them alive. It's decided that he's to be bonded to an appropriate alpha and essentially live out the rest of his life as a brood mare instead.

Kylo is furious.

Bonus points if Kylo's the kind of unwilling omega who's been on suppressants his whole life, so he's in no way prepared to accept his new status.