What I think is amazing about this scene is that Watson did not immediately correct Sherlock's assumption that Harry was male. He did not feel the need to prove sherlock wrong and didn't mention it until he asked about the accuracy. That's John :)
i want to be up there with two people that i love and care about most in the world gifset - sherlock series 3 episode 2 the sign of three. Then John broke Sherlock for a bit and Sherlock froze while he rebooted.