Via some sort of plot bullshittery, Gray Jedi Rey finds Darth Maul's saberstaff. Seeing as she's better with a staff than a regular lightsaber, she hangs onto it. Because the Force works in mysterious ways, Maul's spirit is bound to his weapon and he occasionally pops into existence to observe Rey when she's training with it. Eventually he starts giving her tips that wouldn't work with her Jakku-staff and they bond over their preferred weapon. They can be friends or end up as something more, I just want to see these two interacting.

link:
https://tfa-kink.dreamwidth.org/1841.html?thread=3441457#cmt3441457