Forbidden Magic — Stephanie Burgis

It's 1772, and all of Olivia Amberson's dreams seem to have come true. At eighteen years old, she's an accomplished magical Guardian and a secret witch, with a love spell that's made her unlikely betrothal wonderfully secure...until it all comes crashing down around her in a mass of scandal and humiliation.

Now, with her reputation and her magical vocation both lost, it's time to save her remaining honor by telling her fiancé the truth - but it will take more magic than she's ever known to create a happy ending.

A 4400-word short story prequel to the Kat, Incorrigible series.

Note: this story may not work well for anyone who hasn't read at least one of the Kat, Incorrigible books! (Start with Book 1, Kat, Incorrigible, starring Olivia's future daughter.)