After they beat the honor guards Kylo would wonder how to move forward and blah blah I killed my dad, saw my mom 'die', there's no redemption for me because of this war. He asks Rey who was rooting for Kylo's faceturn for half a movie, how does he move forward.
And boom, wideshot of Rey fixated on Snoke's throne. She turns around and reveals her repressed memories of her parents being actually assholes but if they claim the First Order, she can create her place in the story by ending the war. Kylo disagrees.
And from there we completely flip shit. But that's me.