Interesting but ultimately forgettable story. This story is about the authors and illustrators for pulp sci-fi magazines. How B.E.M.s are the creatures they create, they are real, and have real feelings, and emotions once created.
The general theme seems like something that has been done many times, I don't know if this is the first story like this, but it has to be one of the early ones.
It doesn't quite feel like a complete idea. And I think that is why it's ultimately forgettable.