Strangely while doing Vhala's Quest, the Philon Slave Returns investment is not available. The orc isn't there outside the Slave building and there isn't a succubus by Lexande's room to talk to. I went back through some of my old saves and the last time I could trigger it was before Nalili's quest when the succubus blocking the dungeons in the Orgasmic Empire was still there and after talking to her that orc showed up where he was supposed to. I had to talk to her during Nalili's quest to access the dungeon for training as I recall but with my save after her quest was over, the orc had vanished and my pron between the 2 saves was unchanged so I'm pretty sure I didn't fund it accidentally. In any case it didnt really matter, I went through Vhala's quest anyway and ended up with the Crest of Nations and everything else but I thought it was odd