Kylo makes regular visits to a brothel that has one or more members of a shapeshifting species working there, so that he can have them transform into Hux and act out his fantasies and urges.
His requests vary wildly from visit to visit as his feelings for Hux are sort of all over the place - sometimes he wants to choke him half unconscious and pound him into the mattress, sometimes he wants to be pinned down himself or get down on his knees, and other times he just wants to lie with his head in 'Hux's' lap while he feels long pale fingers stroke through his hair and hears words of love and affection in the General's voice.
+ for it being clear that he's never actually been rejected by Hux, he's just never asked.
Kylo/Other, onesided Kylo/Hux: Shapeshifter prostitutes
His requests vary wildly from visit to visit as his feelings for Hux are sort of all over the place - sometimes he wants to choke him half unconscious and pound him into the mattress, sometimes he wants to be pinned down himself or get down on his knees, and other times he just wants to lie with his head in 'Hux's' lap while he feels long pale fingers stroke through his hair and hears words of love and affection in the General's voice.
+ for it being clear that he's never actually been rejected by Hux, he's just never asked.