After the events of TLJ Kylo requests for Hux to have increasing violent sex with him. Stuff like telling Hux to fuck him til he starts bleeding, choke him until he passes out, beat him to within an inch of his life, break his bones, simulated rape etc. Hux slowly figures out Kylo is trying to recreate how Snoke treated him, since now that Snoke is gone Kylo doesn't know how to function without that kind of abuse on a regular basis.