I'm not asking to rewrite full scene, you can already stay mortal with him in a relationship and ask him to turn you at the end of the game. But for this you need do some tricks, I asked to simplify this point, since the phrase for a mortal already exists in the game.
I see your point. It's nice that they even prepared something for this at the end of the game. But people choosing this trick will miss his best cutscene and a lot of content.
Adding this option to the romance cutscene will have to change a lot. It is Astarion's goal to make his lover his (!) spawn (if you don't accept this, he will break up). Not even this scene needs to be changed then, also the s..scene and "on your knees" scene afterwards respectively they have to cut these scenes off for those who choose this new option. Also, IF there is the possibility to convince Astarion to not become his spawn.. the answers at the "on your knees" scene will not make sense anymore. On the one hand, you would be able to convince him to stay mortal and also have the romance with him, but on the other hand, in the "kneel down"-scene you cannot say "no" anymore? Because this will lead to a break-up.
Plus they have to cut off all the afterward conversations, which would not make sense anymore for people convincing him that they will not become his spawn:"You are so beautiful and you will be beautiful forever." - "What happened?" "You made me your spawn, what is going to happen to me?" etc. Adding this one option will lead to a whole series of problems. It is not just one answer.
And it will go on. So if they would add the option for staying mortal for Tav (but still staying Astarion's lover), they need to cut off all this content for players choosing this answer. And these players choosing this option (I guess it will be a lot then), not knowing about this thread, will then complain: "What? That's it? Why is Astarion not saying a thing after this? Why there is no cutscene anymore?" and they will come to this forum and ask for creating new content for mortal Tav. .. And if not already before, then at the latest this whole thing will break his great story into pieces. That's why I don't support this idea.
But, as I said, I will support the first request: Adding a positive answer for a good Tav, because this would and should lead to the same cutscenes and content and would not change Astarion.
(Sorry, if there are mistakes, I am not a native english speaker)
