Poe is captured by the First Order again, only this time Kylo Ren has leverage - he can see the images of the traitor stormtrooper in Poe's mind, including very tender memories of their first kiss, first time making love, Finn's first time flying, Finn waking up from his coma, etc.

This time Kylo is going to take these memories from him one by one, enjoying Poe writhing under his hands as they are stripped away, enjoying Poe tearfully begging Kylo to stop. Works better than torture.

+++if Poe tries to hide what they've done from a Finn be doesn't quite remember fully after he is rescued/Kylo returns him.