Alright, in the end when Astarion is ascended,
and you try to break up and he reminds you that you are his. I thought either in the epilogue or the last conversation when Tav walks away and turns around, the eyes of Tav slightly glow in the way Cazadors Spawns glow. It would be a glooming sad ending, where it truly shows that he may be repeating his cycle.
