Astarion and Araj

Upon meeting with Araj Oblodra with Astarion in the party, the drow would want Astarion to bite her in exchange for a powerful potion simply because she have always wanted to experience being bitten by a vampire. And while Astarion himself would reject the offer, he can still be egged by the player character into fulfilling her request.

Example of:
Kiss of the Vampire