There and Back Again
The Force, thought Rey, is a real jerk sometimes.
It's been six months since she and Kylo/Ben/whatever the hell he was calling himself had gone up against and actually defeated Palpatine. Or Darth Sidious. Choose whichever name including "overpowered nasty dude."
And while defeating said darksider she died. And then she un-died. And Kylo/Ben was there and she kissed him and he smiled and then he died.
And that's when she found out that being part of a dyad meant you felt like you were walking around with half a soul if your other half died. It was intolerable.
Well, she wasn't the type of person to sit around moaning about the injustice of it all. One way or another, she was getting her other half back. Or die trying. Which yeah, dying sucks when you are still young but on the plus side she would be back together with her other half.
This would take some research and planning. After all, you just can't stroll into the afterlife and demand restoration. What to do, how to do it and the best location to be while doing what would be a major Force working needed to be determined. And that took time with the dusty, moth eaten, sacred, and nearly unreadable Jedi texts.
This added another two months to the separation and by the time she found herself in the Jedi Temple on Ahch-To she was antsy and nearly vibrating with impatience.
Her plan was simple - sort of. Find the spot half way between the Light and Dark power wells (which was next to the meditation stone where Luke projected his essence to Crait - big surprise). Go into deep meditation until she found the edge between her part of the dyad and the missing part. Hopefully it was still between worlds and not subsumed into the Force. Gently pull {or maybe tug really hard) until she pulled Kylo/Ben back across to her. Okay, laid out like that it sounds a bit nuts, but she's out of ideas and she's desperate.
Ok. She's at the optimum spot on Ahch-To (with a comfy pillow. The stone floor is hard and freaking cold). She's meditating and getting really deep into the Force. Aaand there's the edge to her half of the dyad. Time to gently pull. And of course, doesn't budge. So she pulls harder. And harder still. It's a contest between the Force and the scavenger from Jakku. Rey isn't planning to give up on this so the Force says (figuratively) 'Right then if you really want him you can have him.'
One final gigantic heave and Rey finds herself falling backwards when the pressure stops. Her head hits the floor with a crack. She lies there dazed for a moment, head aching, wondering if she succeeded or failed.
Off to the side she hears a voice moan "Owwwwwh! Bloody hell! I feel like I've been pulled through a knothole backwards."
"I'm not sure what a knothole is but I think I feel the same way." Rey groans. She looks to her left and sees Kylo/Ben stretched out on the floor, right arm over his eyes. He's still (thank the gods) in the clothes he was wearing at Exegol - dirty, bloody, torn, with a burnt hole the size of a light saber blade in his sweater.
Kylo/Ben moves his arm, slowly opens his eyes and looks over at Rey and says "Would it be too much to ask where I am and what just happened?'
"Okay, let me explain." she stops and thinks. "No, that will take too long. Let me sum up. We're on Ahch-To, where your uncle was hiding out for gods know how long. We fought Palpatine on the Sith planet Exegol and in the process I was killed. You brought me back to life and died. And being half of a dyad when the other half is dead really, really sucks so I tried to bring you back. Looks like it worked."
"Argh, too many words." Kylo/Ben puts his arm across his eyes again. "You can sum up for me again after the drums stop beating in my head."
"Do you think you're up to walking? I've got the Millennial Falcon parked nearby."
"Give me a few minutes. The room is still spinning."
"Okay. By the way, should I call you Kylo or Ben?"
"Let's stick with Kylo for now. I'm used to it."