The weirdest part to me was when Astarion asks to feed on you to sate his craving for blood. Reasonable request but instead of being a normal non-sexual thing there were heavy sexual undertones and it leads to Astarion having a hard-on for you for the rest of the game. Absolutely disgusting. 

 that doesn't surprise me too much since vampires have been sex objects for weird women and weirdos in general for decades, but it's still gross