Draconia Malfoy and the Boy Who Lived (гет)

What if Draco Malfoy had been born a girl?
Summer, 1996. Lucius Malfoy is in Azkaban, the Dark Lord has moved into Malfoy Manor, and the family's heiress, who was supposed to be a son, has just been given the Dark Mark and a task: kill Albus Dumbledore before the school year is out. If she fails, her father will have nothing left to come home to.
Draconia Malfoy is twenty. Her aunt Bellatrix taught her Occlumency by screaming at her, and there's one memory she hides even from the Dark Lord: at the Yule Ball, she dragged Harry Potter onto the dance floor and, for a few minutes, told him the truth. It ended badly. A year and a half later, Harry helped send her father to Azkaban.
Now, in sixth year, Harry is sure she's become a Death Eater. He's right. And he can't stop following her.
Half-Blood Prince, retold from both sides: enemies to lovers, a redemption that comes at a price, and a love that doesn't absolve. It forces a choice.
(Genderswap AU. Everyone is four years older than in canon, so twenty in sixth year, and there's no romance before eighteen.)