Kylo and Hux have some really aggressive sex from time to time to take the edge off but it's never lead to biting and oops Hux forgot to tell Kylo he's hemophiliac. Cue Hux bleeding a tad bit too much and now Kylo is going "??!!!!!!!!!!!!!!!" while Hux is trying his damned best to calm him down and to get him to take him to the med bay.

++ Kylo makes sure to so much more careful with Hux from then on
+++ Instead of having rough sex they have Aggressive card game night
+++++ Hux has a tattoo of the clotting factor he's missing and being ~~extra badass~~ because of it
+++++++ Kylo becomes 100% more protective of Hux to the point he is nicknamed by the crew as 'The Generals Guard Dog'