So I finished the game and got Katherine's true ending so if the scenario changes much in other ones my apologies, but too my knowledge the fact that Catherine is a succubus is pretty much in all endings. The key to unraveling that fact that Boss is the only one that saw and spoke to Catherine. My girlfriend actually pointed this out to me but early in the game when Vincent is out to lunch with Katherine he blows off Catherine's call and she shows up at the restaurant and talks to the host/server. I don't believe it was the same voice as the Boss but that is the only way this could work without breaking the logic behind a key twist in the story. Did I miss something or did the writing staff?
Slight error in the story (spoiler)
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