For some reason when I try to talk to Karl about the second incest book all he says is not much just thinking what the hell and also how the fuck do I upgrade the automaton or take Sarah to the workshop the hints are way to bloody vague
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You first have to buy the book at the Library. Once you get the sisters love to a certain point then you can talk to Karl. For the Automaton you need to talk to Master for the upgrade. Then you buy the schematics from the Library. The way the game is made, is to allow you to explore everyone and talk to everyone.