Almost every companion expresses their concern for Tav's wellbeing under AA's control.
Each character reacts to AA and Tav's relationship according to their worldview. That doesn't prove anything.
Lae'zel: You have shared your new power with your lover, Astarion. I'm surprised - I expected you to turn your back once you got what you wanted. Astarion: Quite the opposite - I need someone I can trust. And now I know they'll never betray me.
Minthara: Would you ever consider sharing the gift of immortality with me, Astarion? Astarion: I think not. That is for me and my darling to share. Minthara: If they have prevented your eyes and fangs from wandering to other necks, it must be a special bond indeed.
Only characters with a good alignment react negatively. Gale's reaction is rather neutral because he himself is neutral.
