Rey and Kylo are each sent on a mission that involves posing as a courtesan to get close to a target and get information. Either they're both with the Resistance and are running the mission together, or they're still on separate sides and happen to be sent after the same target (preference would be for the latter, but either is ok).
They get picked up by the target together (or run into each other this way if on separate sides) and the mission ends up requiring them to go all the way with him, providing each of them with a very unexpected perspective on the other.
+Rey and Kylo trying not to admire each other's courtesan outfits ++Rey and Kylo aren't in a relationship or sleeping together prior to this, though I could go either way on whether they've fantasized about each other +++At one point the target tells them to do things (your choice) with each other for a while and watches ++++The target is an alien w/ Fun Alien Dick - target can technically be any gender and genital configuration, but some kind of dick would be nice so Kylo can take it while Rey watches :D +++++++Each of them actually finding some comfort in having the other there as a familiar face (and of course realizing their attraction by the end of it)
Rey/Kylo, Kylo/Other, Rey/Other, Rey & Kylo undercover as courtesans
They get picked up by the target together (or run into each other this way if on separate sides) and the mission ends up requiring them to go all the way with him, providing each of them with a very unexpected perspective on the other.
+Rey and Kylo trying not to admire each other's courtesan outfits
++Rey and Kylo aren't in a relationship or sleeping together prior to this, though I could go either way on whether they've fantasized about each other
+++At one point the target tells them to do things (your choice) with each other for a while and watches
++++The target is an alien w/ Fun Alien Dick - target can technically be any gender and genital configuration, but some kind of dick would be nice so Kylo can take it while Rey watches :D
+++++++Each of them actually finding some comfort in having the other there as a familiar face (and of course realizing their attraction by the end of it)