The theory of narrative causality by falling voices written for this prompt: Sherlock and John are BNFs in Sherlock Holmes fandom. Together, they fight crime. (Always.) And write porn, incidentally. I had a sudden urge to read this one again and found to my shock that I hadn't recc'd it! This is an amazing and superbly presented story done by using LJ posts, gmail chats, TV trope articles etc. It's very familiar ground to those of us brought up on LJ and I loved reading it again.