Yes something is off for sure, I started a new game and ended up with the Amazon at Mirimiel's. Then it proceeded correctly. I went into the underdark caverns and got to the amazon growing a dick. I then went back and killed the succubus. Went home to find someone to read the tome. Gathered up the 4 futas, then somehow I had Taramiel fighting herself in the jail. I had the thief and the amazon on my side.
FYI, I never went down to meet Taramiel and the other chick, but the story played out as if I did. Somehow the boy ended up in jail with the other chick sucking her dick. Then it had me fighting Taramiel's Minotaurs. Then fighting herself.