I had the same bug during my game play. To correct it, I ended up using the Ren'py save editor to correct the "slave_mi" variable from "4" to "1". Hopefully this bug will get fixed on the next release.
Yeah I dont use the editor and im not interested to either. lol
you don't have to use some editor. Just open the console, and correct the value by typing slave_mi = 1
ane voila- fixed. Or you can ignore the bug, and just go to the jail section to advance the story.
Oh for bug tracking- each time you do the "make her a slave" routine, it adds one to that value... so it might be 2, or 7, etc, depending on how many times you paid for the slave routine.. before you get it fixed. you can use the command "watch slave_mi" if you are curious what it came to.