I was more thinking on the lines that Cazador see the connections we have with Astarion and just for the pure vile of it gets us to betray him. Kinda dark if you are in a relationship with Astarion and betray him to become a vampire in your own right. There are spells and other "geas" type of agreements that Cazador may not be able to break, if you agree to it to become a full vampire. I think that would be up Cazador's ally.
