The Twilight Saga: I Am Nikki's Sister

My birth was an accident. My name is Ashley Jamett Cullen, a combination of the names Alice, Rosalie, Jasper, and Emmett. I am the biological daughter of Isabella Swan and Edward Cullen, and the twin sister of Renesmee Carlie Cullen. My sister is half vampire and half human, and nearly drained all of our mother's lifeblood while still in the womb. So no one ever expected me to exist. After all, if I were like my sister, even if both of us survived, our mother would certainly die because of us. But I'm different. Even among vampire-human hybrids, I'm one of a kind.

Note: This may be a short story, but it won't be abandoned. Told from a POV perspective. It may include worlds beyond Twilight, depending on how big my imagination gets.