My impurity reached 20 through in-game methods and I took depravity potions until it got to 120. It still doesn't make any difference in what duke scene shows up though. I tried deleting my saves and deleting and redownloading the game but the error still remains.
Sorry for the late response, here's the save file.
https://mega.nz/file/SBlzwTCA#WChKk5HJ1unSn1O0M17GHqygkuFGsgDHVZdtFIiCAUY