Regarding (im)mortality

THIS STORY CONTAINS SPOILERS FOR THE ENDING OF BG3. Read at your own risk.
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After the final battle against the mind flayer threat Arista made her way back to the Underdark with Astarion. Their new mission: find the freed 7000 vampire spawn and teach them how to survive without causing a bloodbath.
But Arista has a second mission, a secret mission. Finding a cure for Astarion's vampirism to give him a chance to walk in the sun again without the bloodlust but also without immortality.
It's supposed to be a surprise but all leads she has found so far turn out to be a dead end.
Her last option: Asking a gift of the Goddess she has worshipped ever since her family fled Menzoberranzan.
But what she is asking proves to be too much for a lesser deity such as Eilistraee. The Goddess however does know a way...
With the stakes raised Arista can no longer keep her secret from her lover.
Will he embrace mortality for them, for himself knowing what it might cost the Paladin at his side? Or will he watch his true love age and die at his side, sparing her from the pain the path in front of them promises?