For the six people in the world who don’t know who E.L. James is, I’ll tell you. She wrote a Twilight fanfic called Master of the Universe which is the basis for the Fifty Shades Trilogy.
Fifty Shades of Twilight Fifty Shades of Grey (Fifty Shades #1): Bella Swan Anastasia Rose Steele lusts after Edward Cullen Christian Grey who is a successful and wealthy businessman. Includes stalking and a sex dungeon.