I don't know what the complete version of " 58 Shades of Grey " is. It could be a name or a novel. If you can provide more information, I will try my best to answer your questions.
The 'Crossfire' series by Sylvia Day is also similar. It features a relationship that is both steamy and full of emotional turmoil. The main characters are drawn to each other in a way that readers of 'Fifty Shades' might find familiar. The story delves deep into their relationship, exploring power dynamics and love.
The ending of Fifty Shades of Grey is kind of a closure where Anastasia and Christian reach a point of understanding and acceptance. There's a sense of hope and stability for them. However, some might find it a bit predictable or not fully satisfying, depending on their expectations.
Definitely not. Fifty Shades of Grey stands on its own. It doesn't draw inspiration from Twilight. The styles and content are distinct from each other.