Rey, Poe, and Finn are in a poly relationship and are experimenting with adding a reformed Kylo/Ben into the mix. However the trio quickly finds out Ben went through some pretty horrific abuse and conditioning while in the first order and thus has no idea how healthy relationships work. Cue the trio gently teaching him via being loving and supportive and helping him with his issues.

+Ben struggling with self injury as Snoke encouraged it to draw power from pain, thus leading him to an addiction

+Ben's only previous sexual experiences were at the hands of Snoke and thus abusive, so he believes things like sex being something he owes people or that its supposed to hurt

+Ben expecting to trio to harm him due to both his upbringing and what he did as Kylo and being surprised and confused when they're the opposite

+gracious h/c and fluff