@Ren I completely agree with you, I am sorry for what has happened to you, and I agree that slavery should not be joked upon.
My curiosity pushed me to do further research, and I would say that we both were right in different ways.
The Cambridge Dictionary says that:
-Modern slavery is the condition of being forced by threats or violence to work for little or no pay, and of having no power to control what work you do or where you do it:
Modern slavery includes domestic slavery, forced sex work, and forced participation in crime such as cannabis production.
-Slaveryis the condition of being legally owned by someone else and forced to work for or obey them.
-Imprisonment: The legal act to imprison or to put someone in prison for something they have done (running away is NOT illegal so he has to right to imprison him, but in this case (ignoring that the fact we are now discussing is a piece of fiction) is false Imprisonment, the difference is that it's illegal, in either cases the captor shouldn't AND mustn't rape the captured since it goes beyond human autonomy and authority over themselves, in short words it goes against human right, something that a captured has, even though legally minimal.
By this logic, the right words to describe this situation is False Imprisonment and Sexual slavery. I am sorry if this reply may make you feel uncomfortable, if you wish i will completely delete the comment, and i have no bad intentions such as being mean to you or to anyone who has a "different opinion". I might be wrong, this is OBVIOUS NOT my intention about such a delicate thing, I am always open to know new things and change.
"Money is the reason we exist, everybody knows, it'