Hey, this is fantastic! I'm not all that keen on AU fics, but the way you introduce the Spider, and The American Facility that is not at Groom Lake, and then Harry Hartsfield, pulled me in. And of course, the story seems to become less and less AU as we go.
I like your description of the Spider, and the things he likes and dislikes. That sets the tone for the rest of the story, and we're off!
I like the strange magic artifacts you introduce into the story, and the way they're dealt with.
I like the hot sex that Harry and Spider indulge in, and the way Spider is somehow manoeuvered into doing things that are ... beyond inappropriate ... unacceptable ... unconscionable and unbelievable but obviously, oh so gooood. :D
An intriguing ending too, with the two birds swooping in the sky, giving Harry the perfect chance to put his point across, and then the interruption of the rogue magic. Wonderful!
This is a remarkable story, one that I really enjoyed. I'll be reccing it on my journal here, and at LJ.