Shercock by Alice Sanders is a short erotic story clearly based on the BBC TV series Sherlock. In the fan-fiction world this kind of story is pretty common: take two or more characters, and describe them having sex.
For a story of this type it is pretty well written. And erotic fan-fiction is pretty well tolerated by many rights holders. However this author has decided to use a photograph of the actor in costume on the cover, load the story on kindle, and charge money for it. In my opinion this is very ill-advised.