"The Exterminator" by Erik B. Scott appeared in Daily Science Fiction on January 17, 2013. "A human is given a job as an exterminator on an earth occupied by aliens." The editors warn of adult-level violence--take heed.
This tale offers a couple of twists on a not uncommon theme, that of collaboration with an alien occupier. My own father lived through chillingly similar circumstances in Nazi-occupied Poland in the 1940s. Perhaps because of that, I found Mr. Scott's tale to be all too predictable, sad to say. 4 out of 7 rocket-dragons.