After Hux finds Kylo in the snow and gets him healed, he is at his bedside before bringing him to Snoke. Kylo is shaken by being defeated, but he is more shaken still at having killed his father - despite all his claims that he meant nothing to him.

Cue to Hux slowly undressing him and gently caressing him, praising his actions, telling him he did the right thing. Tender sex as he reassures him that he will defeat Rey the second time, they will be victorious in the end, and any other praise that comes to mind.
Kylo just reveling in tenderness and validation, and being basically putty in Hux's hands.

Bonus if Kylo actually does the same thing concerning the destruction of Starkiller base, and Hux doesn't want admit how much he needs that.