What is "Fifty Shades of Grey" about?

It's a human!Twilight fanfiction, Masters of the Universe, that was renamed and edited into a unrelated erotic novel. The premise is a college student seduced into a submissive S&M relationship with an attractive young billionaire.

Idk

my friends were talking about it the other day, and from what i know, it's like all about sex. my mom's reading it now and she won't tell me what it's about, so that explains why.