The Devil you know
Tav is an asshole and hands Astarion over to Gandrel at the first opportunity. Astarion is dragged back to Baldur's Gate, terrified by the thought that Cazador is just waiting to get his hands on him again. Luckily for him, a certain Cambion seems to be rather interested in his fate. Raphael offers him a pact: protection in exchange for servitude. Of course, the devil has his own plans, even if it's just to spite his father.