Here are some great lines suggested by players in this thread. Every one of them is better than the ones in the game.
Yuniex:
“I'm happy is over and you finally get to live again!"
"I'm happy that you are free, and is enough for me to be by your side".
Ametris:
'Now I just want to get rid of the tadpoles' - Astarion could say: 'That's the next step, of course. Thanks to the ritual our chances of survival have grown exponentially... And they still can grow further. You could become something more as well, my dear. One little bite...'
"I want to be with you' - Astarion could say: 'Darling, that's exactly what I want as well. To be with you, always. And I have the means to make it a beautiful reality. We could be together for an eternity...'
'You don't have to do anything for me, I'm just glad he won't bother us anymore and we can relax now. We're finally free of him.' - Astarion could say: 'Oh my dear, you truly are the sweetest. We are free, yes, and we'll never have to worry about it anymore. Just like I never have to fear anyone again... so can you become stronger and see all your foes fall before you. You could be so much more..."
'I think we should toast to our victory. I've been saving a bottle just for the occasion.' - Astarion could say: 'You are just so adorable. You even thought of that... awww. We'll do it eventually of course. But don't you want this night to be truly memorable and one of a kind? You could become mine forever...'
'We could go for a midnight stroll in some dark alleys and look for trouble. Not like I'll have to worry about getting hurt with a mighty vampire lord by my side.' - Astarion could say: 'Haha, what a delightful idea, we should definitely do it one night. You could actually become untouchable yourself, you know. I can make it happen... You could join me in immortality and be mine forever...'
Bethra:
'I just want to be with you my love'.
Nicolean Complex:
"I just want to be with you"
And I'll add my five cents just for the variety of options:
"You're free! You feel alive again! You've had your revenge and you've gotten everything you deserve - all the joys of life are open to you, and they're yours. Can there be a greater reward for me than this?"
