After you get the map for the slavery base, go to the slaver base, when you enter, you should see a little pond and a guard, it doesn't matter how you interact with the guard, you'll be caught, and when you get to the part where the slaver leader says for you to be a ____, press back as the option in the bottom right, if you did it right, he should say you'll be a sex slave, and you gotta do what you are told 3 times, and then they should say they'll keep you, then you'll get saved by Cathie I think, it was a while since I did it, but then you two will escape together