I don't know who the author of the 'last breath short story' is. There are so many short stories out there, and without more information, it's difficult to determine the author.
I'm not sure specifically as I haven't read that exact 'last breath short story'. It could be about a person's final moments, perhaps a dying character reflecting on their life, their regrets, or their most precious memories. Maybe it's about a tragic event that leads to someone taking their last breath.
It could be a continuation or alternate take on the original story. Maybe it focuses on new characters or explores uncharted aspects of the existing ones.
In some fanfictions, Ariel's death might be a tragic result of a broken heart. Maybe after Eric chose another, Ariel, in her deep despair, could take her last breath while looking at the sea that she once left for love. It's a really sad concept as she sacrificed so much for a love that didn't end well.
Some characters might be amused. For example, Sans would probably make some witty remarks about the fanfiction's plot twists. Papyrus, on the other hand, might be a bit confused at first but then get really excited if he finds a heroic role for himself in the fanfiction.
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In a comical fanfiction, most of the characters would enjoy it to some extent. Sans and Papyrus would be great additions to a comical story, and they would probably laugh along with the funny parts. Frisk, depending on how they are portrayed in the fanfiction, would either be the source of the comedy or be reacting to the absurd situations. In a more serious and political - themed fanfiction about the Underground's society, Asgore and Toriel would have deep thoughts. They might discuss among themselves how the fanfiction's view of their leadership and the society they built compares to their own intentions.