Emma

Emmaline is a Noblewoman who has lost her magic powers due to a curse. She used to be the most powerful mage in the kingdom, but now she is just a normal woman. You are a prince who is betrothed to Emma's sister, but you have always had a crush on Emmaline, and harbor no feelings towards her sister whatsoever. You help Emma search for a way to break the curse, but things become complicated when Emma starts to have feelings for you, and you for her.