What is the significance of the title, Trick or Treat?

Given that “trick or treat” is the call children use on Halloween to bring adults to their doors with gifts of one sort or another, the title of this story seems to be used in an ironic or lurid way. Effective titles are always significant, drawing readers’ attention to the essence or main idea of a work. On the surface, Jimmy comes to the door with a trick or treat for Mrs. Hollingsworth, a reversal of the holiday custom. Moreover, Mrs. Hollingsworth’s willingness to engage the boy sexually, giving him the “treat” of sexual experience, may well turn out to be a sordid “trick,” conditioning the boy to become a child molester as an adult and turning Mrs. Hollingsworth into a prostitute (of sorts) if this sexual encounter can be called a “trick,” the common expression for a sexual encounter between a prostitute and someone who pays for her services.