Isn’t this just another “The Story of O” but with worse writing?
The “book” is based on fan-fic. Fan-fic sites allow users to collaborate on writing more episodes to series which they follow. For example, fans of Twilight wanted more of Edward and Bella after the movies ended so they create Fan-Fic episodes which they all write together but, given the copy right issues with Twilight,they changed the names and settings of the Twilight series from Bella/Edward to NY Billionaire and Christian etc. And so talentless groups of people got together to continue their fantasies. And someone in publishing came along and, realizing that fan-fic was not copyrighted, collected the postings from the website and had it professionally edited and marketed. So the “author” didn’t actually write this...stuff...but collected it and sold it. Obsessed fans worked together to spit up this “gem” of literary success.