The formula: book (-) x Astarion (-) = Bookstarion (+)
Means If you give the book (very negative, bad) to the companion already turned evil (by negative energy, bad), it's a win! For, for us I think?
Let's see if math applies to vampire spawn!
I wonder what this "Bookstarion" would be like. Astarion inversed? Kind, but also a bit boring, not very talkative and definitely not flirtatious at all? The "kind" part is nice, but the rest? Maybe this experiment was not fully successful