Fifty Shades of Grey

The Fifty Shades trilogy was developed from a Twilight fan fiction series originally titled Master of the Universe and published episodically on fan-fiction websites under the pen name ``Snowqueen's Icedragon''. The piece featured characters named after Stephenie Meyer's characters in Twilight, Edward Cullen and Bella Swan. After comments concerning the sexual nature of the material, James removed the story from the fan-fiction websites and published it on her own website, FiftyShades.com. Later she rewrote Master of the Universe as an original piece, with the principal characters renamed Christian Grey and Anastasia Steele and removed it from her website before publication. Meyer commented on the series, saying ``that's really not my genre, not my thing... Good on her--she's doing well. That's great!''

Question: is fifty shades of grey fanfiction of twilight
Answer: yes