I am completely on board with this suggestion! Astarion’s quest line seems to be leading to this possibility, at least, through one of the methods below.

Originally Posted by mrfuji3
So other options are:
-convincing Astarion's master to make him a full Vamp, probably through threats/bribery
-Astarion (as a full vamp) opting to elevate you from his spawn to a full vamp