Hi! This is a cool question, I actually decided to finally make a real account just so I could throw my hat in the ring with this!
It's too bad to learn that main character can't drink the special wine that helps Asterion. Ever since I started the game I've been hoping that main character and Asterion would share a tender moment where Asterion offers main character some of this special wine as a way to show how close the two have become and how he now trusts main character with something as important and useful as the wine. He's willing to give main character some of the wine even though there is so little of it in existence, and it's one of if not the only thing that can heal him, which is why sharing it with someone else would be so profoundly meaningful to both Asterion and main character.
Anyways that's my two cents!