If you've ever ventured into the world of reading fan fiction online, then you have my condolences.
The stories might feature all of your favorite characters and some pretty descriptive writing, but the content usually takes a wild turn. And by wild, I mean downright pornographic.
Usually it's pretty easy to distinguish between fan fiction and the real stuff, but if you're trying to find a copy of a book online, you could easily end up clicking on the wrong thing in your desperate search for material. Which is probably what happened to this Twitter user's friend.