Many of your short works read like they've been snipped from a larger story. Differently, this one does not- everything is there to make it a short story, although there's easily enough interesting background material to expand upon as well, if you ever wanted to. And I like that - sometimes, it's nice not to be left wanting to know more, I suppose.

Plus, it's creepy.

As a side note, I admire those authors who wrote/write numerous short stories/novels that are all part of the same universe, even when the stories are unrelated (Andre Norton, for one.) I don't think I'd ever be able to keep it all organized, myself!