"What the heck? Of course John can read!" <--- this is kidlock, John doesn't have to know how to read because for all we know they could very well be 4 years old. Which makes it ten times cuter if you think about John and Sherlock at four years old
The rescue by ~YuriOokino on deviantART this was supposed to be funny. I realize this. But, even though its just a drawing and probably not cannon, the fact that Sherlock refuses to think that John is the one injured warms my heart.