The story plays out like we see in the movie except that Kylo Ren used overwhelming pleasure to torture Poe at the beginning of the movie rather than pain. (Forced orgasms, making him beg, the whole nine yards.)
Now Poe is safely back with the Resistance post-movie, but even though he tries to act like normal he can't stop thinking about what happened to him. Because no matter how many times he tells his brain that what happened was torture, his body can't shake the memory of how good it all felt. He has nightmares about it and wakes up with sticky sheets, catches his mind wandering towards the memory and feels sick with the knowledge of how much Kylo Ren made him enjoy it.
Basically, dirtybadwrong pleasure torture and Poe hating himself afterwards for his body's reaction. Feel free to include flashbacks to the actual incident, but if you'd rather not then that's okay too.
Huge bonus for "Ben and Poe have history before Ben turned dark side" trope because it is my lifeblood.
Kylo Ren/Poe, non-con/dub-con, Poe remembers Kylo Ren using pleasure to torture him rather than pain
Now Poe is safely back with the Resistance post-movie, but even though he tries to act like normal he can't stop thinking about what happened to him. Because no matter how many times he tells his brain that what happened was torture, his body can't shake the memory of how good it all felt. He has nightmares about it and wakes up with sticky sheets, catches his mind wandering towards the memory and feels sick with the knowledge of how much Kylo Ren made him enjoy it.
Basically, dirtybadwrong pleasure torture and Poe hating himself afterwards for his body's reaction. Feel free to include flashbacks to the actual incident, but if you'd rather not then that's okay too.
Huge bonus for "Ben and Poe have history before Ben turned dark side" trope because it is my lifeblood.