Personally I would take a Terabyte's worth of Neil Newbon just saying "Hello, lover." in Astarion's voice, that's my dream ASMR.
Very understandable
And I love my character`s reaction when Astarion says that, she's got a big smile on her face and looks quite smitten with him. It's very cute and funny, especially when I play as a high-charisma character who would usually be the one to charm others. I`m very curious where this romance will lead, especially when you are playing a "good" character.
Personally, I think that Neil Newbon's acting/voice acting for Astarion is perfect; to me, it's some of the best voice acting I’ve heard so far. He really brings Astarion to life as a very complex, nuanced character.
And the voice acting for all our companions, and all the NPCs, is really good.
Back to the topic:
In my current playthrough, I have not noticed any changes in Astarion's lines, but I have not reached Grymforge yet. I am very excited about the new content.