Triton and Ursula young and in love

Here is a little twist: once upon a time Triton was in love with an octopus girl from the undersea outcasted clan. He was then one of the 7 brothers all competing for the late King's throne "of the ocean". Young and naive, the outlaw mergirl believed in the young prince's words and gave him all she had to help him gain his father's trust. She eliminated her own clan and gave her soul to the art of dark art of magic. Once the deed was done, the heir to the throne and the court decided the witch girl was dangerous, unfit to be around in public and so they sent her away. As for Triton, the future king of the ocean, chose for himself Athena, a beautiful mermaid who was once bethroted to his elder brother. The merwitch was swallowed by despair and hatred and with the little power she had left, she casted a week spell on Triton so that he would lose all the ones he ever grows to love...