Coral and Pearl
Even without the nod to "The Little Mermaid" this story stands strongly on its own, as a unique exchange between neighboring noble houses and their relationship with the sea, and could use further exploration!
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I was interested to know more about how Coral and the Duchess Pearl grew their friendship to such a strong one, apart from being neighbors. I did not get the sense at all that the Duchess was greedy or evil in any way, so it didn't exactly align with your summary, I'd fix that. It would have been nice to get more from Coral's point of view throughout the story too, since she is the one with the secret, and keeping a secret can be exhausting, isolating and bring about lots of emotions, especially at such a high-profile, profound moment for the characters. Might just be my male perspective, but I felt like the Prince and the Duke got barely any screen time, surely they deserve some backstory too, even just if through thoughts or memories of Coral or the Duchess to give them a bit more life.
Overall a very good story, and left me wanting to know more about the mysterious Star! Keep at it!!