Hello. I would also like to point out something minor that I noticed just now. For some reason, giving a collar and raising KP to >= 75 doesn't update the status to "sex slave". It also doesn't tick the "Make XXX my sex slave" in the story tracker.
I first noticed this in Anna and Kleio. I saw them changing to "girlfriend" status but wanted to turn them into "sex slaves" because it might affect Emma's story.
I'm pretty sure that this worked differently before or I may have just missed something.
Please look into this. Thanks!
Edit: I've found out that the behaviour is inconsistent in current version. Some girls will change status to sex slave once given a collar. For some, status won't be affected.