Prologue:
Once upon a time there where two very special little girls. They each processed extraordinary powers that exceeded that of a normal witch or wizard. They were at Hogwarts the same time as Tom Riddle, later to be known as Lord Voldemort. Because of their potentially dangerous powers they were put in a hidden house in the heart of the Forbidden Forest. One was every bit the organized girl, even though she had migrated from America for the best wizardry teaching she could get. She was polite and bubbly. A girl clever in every aspect. But hidden deep in the bottom of her soul was a strong, brave heart. The other fled from America because of her parents did not favor witches. She was nearly locked away in a research facility because of her abilities. Because of this she always she distant and dark. She was the model of a rebellious American teen. She had dyed two strands of her hair aquamarine blue to frame her face. She was a tomboy with anger and tough etched into her face. She would play Quidditch and other pick-up sports. She claimed she was not cut out for rules. But deep down under layers of suspicion, hatred, and masks there was a compassionate heart. One winter day in their seventh year these very different girls combined forces to save a dying unicorn. In its gratitude the unicorn granted them eternal youth. They were seventeen at the time, and they haven't grown a day since. It was a blessing and a curse. They watched their friends grow up, get married have children, and die. They agreed they wanted to stay at Hogwarts and protect it. Their real motive was to never have to deal with death again. You can image how long that would last. They later became an elite force essential to the downfall of Lord Voldemort.
They were gorgeous. They were angels. But they did not have halos or wings. And they weren't anywhere near holy. This is the story of their first mission. Whoever said angels had to be good girls.