Green is not a creative color said:

A romance between Rey and Ben begins through continued contact through the Force.

If VIII had Luke’s first action be throw away his lightsaber, why not make Rey and Kylo’s first action in IX be kissing passionately while everyone around them watch in confusion?

EDIT: PLOT TWIST: Reylo is necessary so that Rey is a Skywalker since she will be the wife of a Solo and mother to a Solo.

First off, like was saaid earlier, VIII made a big deal out of the fact that her heritage doesn’t matter, and this would contradict that. Second off, why not have her simply take on the name without that? Maybe Luke decides she’s like a daughter to him and tells her she is now Rey Skywalker. It would feel far more appropriate.