Evil Step-Daughter: Fantasy Romance

It was precisely what she'd wanted, and that made her furious. She'd set an impossible task. In order to marry her daughter, which was what every knight who came to the castle wanted, he'd had to figure out the perfect gift for the queen. He had. She was so angry that she nearly hurled it across the long corridor of flagstones, but she couldn't. It really was that perfect. She looked at the knight kneeling before her, his head bowed to await her verdict. He was a nice man, a gentle man, a man who was clever and smart and skilled and-- Her daughter would make his life hell.

Inspiration: Finding exactly the program I wanted.
Story Potential: High.
Notes: I really *like* the idea of a wicked step-daughter instead of a wicked step-mother, an evil princess instead of an evil queen. It would be a nice twist for a romance.