Hmmm, anyone want to take a guess at this one? *grins*
For all their antagonism towards each other (I'm dealing with a child) i really do think they have a shared affection for each other. i've picked up on it a couple of times with tones that Sherlock used when talking to Lestrade, and Lestrade seems to be softer towards Sherlock a few odd times. Plus, it lets John of the hook. gefufufufuuu.