It could be a 3 part reveal
“I pushed you in the desert because I needed to see it, I needed you to see it, What you did to your parents, so long ago”. Rey’s reactions to Kylo’s dialogue works perfectly as a reaction to the reveal. In the hangar Kylo would tell Rey that Palpatine has been waiting for them all this time, that he sensed their darkness since they were children and declares that Kylo and Rey are a Dyad and that they will inherit the dark throne. (for this to work, Palpatine’s plan from the start would be to bring Rey, not kill her, so instead of “kill the girl” his dialogue to Kylo would change to “find the girl” “you will rule the Galaxy as Emperor and empress”)