@pakyu1199 While I guess I can kinda sorta see where you're coming from, you should try to be a bit more flexible and not force OUR world's standards to THAT world's standards (when in Rome...).
In that world:
1. Slaves are a thing.
2. They're treated quite decently (the master must provide food and lodging, and if there's extreme mistreatment the slave contract is nullified). Sure, from what she says she kinda expected to sleep on the floor because SOME masters do that, but still better than some slaves in our world (and I mean nowadays).
3. And coming from above, she has gotten a pretty decent master that cares for her, listens to her, respects her opinion.
4. (Female) slaves expect to be sex slaves. It is what is.
5. The mc is gentle with her, and though he knows what he wants and doesn't hesitate to take it, he keeps asking her to make sure she's as comfortable as possible.
Now put it all together. Exactly how is she forced? She's not quite complaining, and while some may say "she can't, she's a slave", I'm sure she could be a b*tch about everything, do her job half-heartedly, let the mc be hit every now and then to cause him pain... If you ask me, she seems pretty content with her situation, all things considered.
Plus, check the sex scene in this chapter. Sure, the night and morning kiss plus the sex itself may be orders that she can't oppose, but she could roll away from him and put as much space as possible when he's done. Instead, she's gently kinda holding his hand.
Don't get me wrong, I'm not idolizing or approving slavery, but as I said, THAT world. Not this one.
And one last thing, if you want to talk about being "forced"...look around yourself. I'm sure 50% of the people you see are being exploited at work with insane ours, or unable to get sick leave (and fired if they do). Mining is a dangerous job and they get no job security, their health goes bad FAST (even without mining collapse-type events).
Sorry man, EVERYONE is forced to do something they don't like in this world.