【Short Story】Who was it that set a trap for the crown prince who danced with wild joy over true love with a non-human?

At a festival in a world governed by magical power, I, a duke's daughter with considerable magical prowess, transformed a single butterfly into a beautiful woman. Even after becoming human, the beautiful dancing butterfly is named Monet. The crown prince who is supposed to be engaged to me becomes infatuated with Monet. They say the crown prince and the butterfly are in love with each other, but it seems he probably only sees you as a perch. Of course, Monet, who was once a butterfly, cannot live as long as a human. And then the crown prince gives me a cruel command. "Give your lifespan to Monet."