I want Ren trying to use the Force during sex and failing, in a way that's really just embarrassing for everyone involved. Because his control is shaky at the best of times, let alone when he's being fucked, and Hux takes a certain amount of spiteful amusement out of waiting until it's really obvious Ren's trying to Force-compel him to do something and then doing the exact opposite, just to screw with him.