Hux is obsessed with the Resistance leader Leia Organa, wants her under his control, wants to break her, wants to make her hurt for the way the Resistance has caused him difficulty, wants her to belong to him for his pleasure alone, wants her to worship him in every way imaginable.
But until he can capture her, he'll settle for doing all that with her son.
One-sided Hux/Leia-> Hux/Kylo: obsession by proxy
But until he can capture her, he'll settle for doing all that with her son.