OMG. This *is* so AU, and I love it love it love it to pieces. I want this to be a television show, starring David Tennant and Billie Piper, and I would watch it for hours and buy all the DVDs and such. Yes, continuing adventures, they would be much fun. Especially since it's rated R and I was waiting for smut! You clearly must write the sequel with smut!

In all seriousness, I did quite adore it. It's very clever, and it's amazing how well I know these characters, who are mine and yet not, in the paragraphs that you give us. Your world-building is astonishing.