Hux encounters lightside Ben Solo (could be a jedi apprentice or a senator or something else entirely) and becomes obsessed with him. He's very close to his mother and confides in her about his feelings. She's the type of woman who feels her little boy should have whatever he wants so if he wants this Ben then she'll make sure he gets him. She has Ben kidnapped and tortured into submission and presents him to Hux as a perfect broken little pet.

Bonus points if Hux and his mother have a really creepy relationship that isn't incestuous but is definitely weird and inappropriate. Like for example the mother stays and watches as Hux 'plays' with his new pet and Hux has no problem fucking in front of his mom.