This question is years old, and by putting my 2 cents in, I might indirectly activate the neurons of folks browsing and finding it at the surface again. But to the accusations posted by some fellow that were isolated to a chat that is now frozen, 1stly I don't find the intent confusing or morally culpable at all. Nobody is being "punished". An evil creature or force is taking satisfaction that it feels is deserved, when everyone in the situation knows that it's wrong. Nobody reading the scene is going to take moral lessons from an evil spirit. 2nd, <PERSON>'s enjoyment - whatever form that takes - is balanced by her feelings of guilt, which is a possible symptom of RTS. Guilt is something the victimized have to work through or seek therapy for, for the obvious implication. And any physical enjoyment would be involuntary. Only their captor is happy, and from the barebones explanation given in the OP, I find him/it excruciatingly unsympathetic. 494
Exceedingly simple.
I don't know how far along original poster is, or whether you've ditched this idea. But have you also considered that the evil being might decide to possess <PERSON> or <PERSON> to cause even more, or alternate, trauma? Perhaps act out rage that they might feel directly toward <PERSON> if he were not mind-controlled? Perhaps the creature holds <PERSON> in place to be helpless toward its rage? The whole scene then comes across as intentionally warped facsimile of the human interactions that dictate such events in the absence of the evil creature. I think if that happened, everyone would be emotionally tired after the nightmare, too. Also be careful when thinking about how the story progresses, and how involved they'll each be with events that come after their torment at the hands of, well, some kind of <PERSON> spirit. I could see this easily causing scars that would distance the three heroes from each other. For a long time. They may, or may not, be able to reconcile with the pain and move past it. Adding in magical or supernatural factors like mind control can make the recovery process even more unpredictable. One or more of the heroes could be motivated to reunite to destroy or seal the evil that ruined their lives, or could want to run away and leave everything and everyone behind, to put as much distance between themselves and reminders of the pain. I guess it depends on what's at stake.
For everything else, I believe that the highest-voted answer by the fellow who gave an example analysis of a scene from The Girl With the Dragon Tattoo is the most comprehensive, and perfect. 516