Do you have any positive lines that you might want to add @Mirmi? Anything that you would like to see that someone hasn't suggested yet?
So many great options have already been suggested here, under which you don't even need to rewrite Astarion's voice lines, that I don't have anything to add. I just agree that what we have now should be changed.
"I'd like to be by your side, that's enough for me." "I want to be/stay with you." Perfect+1.