[So, it's out of some sort of obligation, partly. Hux hates it and he's not sure why. This basically confirms that Kylo will stick by him no matter what, but it doesn't make him happy.

It's strange, Hux thought just owning Kylo in some manner would be enough, but it's not.]

It was foolish for me to believe that your feelings for me would continue. If you're only here out of some stupid duty or vow, then leave. I care nothing for that.

[Look how straight and neutral he's being. He's not shaking, especially not his hands. The hitch in his voice is completely imagined as well.]