hehehe, you're kind of touching on one of my other favorite tropes: hypnotism. The utter humiliation of having your brain directly reprogrammed to your abuser's desires. To me, that's sort of a separate kink from bimbofication (although of course there's crossover!).

What's fun to me about bimbofication in Astarion's story specifically, is that it's basically what happened to him canonically. He was once a respected magistrate, now transformed into an empty-headed whore. People like to headcanon him as vain even when he was alive, but I think it's kinda fun if that came as a coping mechanism/reaction to having to rely on his appearance to survive. Classic bimboism! You were once so smart, and now your only value is your looks and sex skills. How tragic...