A One Direction fan's erotic online fiction about her fantasy romance with singer Harry Styles has been commissioned into a series of novels by a major publisher.
Anna Todd, who lists racy best-seller Fifty Shades Of Grey among her favourite books, published the stories, called After, on an online sharing site for writers.
The stories have been read millions of times.
She said the books, which she warns contain "detailed sexual scenes" and "explicit language", are a trilogy that "tells the story of Tessa Young, an optimistic freshman at Washington State University, and the dark, troubled guy who has stolen her heart".
The books, which will also feature appearances by bandmates including Niall Horan and Zayn Malik, started life online at Wattpad, which allows writers to publish work and contact their fans.
It was reported in the United States that Todd, who lives in Texas, had signed a six-figure deal with Simon and Schuster.
A spokeswoman for its UK arm said it would release the first book in this series at the end of this year.