If you couldn't put down Fifty Shades of Gray you'll probably want to read some of these books too.
1. The Steele Stories-This trilogy is about a couple similar to Christian and Anastasia. The author is already a New York Times best seller.
2. A Million Dirty Secrets-by L. Parker. This started out as fiction for Twilight fans but went much further.
3. Crossfire-Sylvia Day- A 4 part series about a woman who finds herself attracted a man in spite of the demons he struggles with
4. The Breathless Trilogy by Maya Banks. Each book is about a different man
5. Just One Night-Kyra Davis- This is already a best seller. One night changes everything for a safe predictable woman.
Source: Hello Giggles