Never really understood the basis of stories where people (especially men) are forced to be submissive. It's one thing if that's your kink, but quite another to be forced, as in most cases in a 1 vs 1 fight they could kill their tormentor, sure they will likely be killed in turn, but are they really any worse off.
I know "don't play it if you don't like it," and I agree in theory. It's just something to ponder.
To be honest, I do see this dichotomy, and it was something I struggled with while writing the story. Ideally, I think it should be up to the player to decide the feelings of the main hero. Unfortunately, this would have huge implications in terms of story branching (and therefore production complexity), so it's not entirely feasible for a one-man development "team". So my solution is a certain amount of ambiguity in the protagonist's feelings about the situation, which will manifest in later chapters.
As for "killing and getting killed", let's be realistic, a normal average person doesn't go around killing people. At this point in the story, I don't see the main hero being cornered enough to resort to any drastic measures.
A normal average person generally isn't made a slave, who is subject to repeated beatings/torture and other violations, all against their will, normal people have and will kill for far less.
As for the effect of too many branches in the story I agree it would be too cumbersome, its just something to ponder on.