Hux has no clue how to get Ren under control and stop destroying his ship. So either Director Krennic straight up gives him advice, or Hux finds Krennic's diary/book/notes/log/whatever detailing how he dealt with his respective Force user (Krennic can be deceased or still surviving for this one). + lots of parallels between Krennic and Hux's situation + Krennic is trying to set up Kylo and Hux if he's straight up dispensing advice, or if Hux is using his texts then Krennic's own experience ended in Krennic falling in love with his Force user. + If Krennic is still alive, he finds out Hux used his text. Reactions are up to you. + Kylo gets jealous over Hux's constant interaction and camaraderie with Krennic if he is alive, or his apparent obsession with the man if Hux is reading Krennic's texts.
Kylux, Hux tries to fix his Ren problem with Krennic's guidance
+ lots of parallels between Krennic and Hux's situation
+ Krennic is trying to set up Kylo and Hux if he's straight up dispensing advice, or if Hux is using his texts then Krennic's own experience ended in Krennic falling in love with his Force user.
+ If Krennic is still alive, he finds out Hux used his text. Reactions are up to you.
+ Kylo gets jealous over Hux's constant interaction and camaraderie with Krennic if he is alive, or his apparent obsession with the man if Hux is reading Krennic's texts.