I could see this as being one possibility for why the Doctor is the way he is. Very well-written, and I love the repetition bracketing the story.
That was wonderful. Really great.
This is the first time someone's given me a reason to believe that the whole half-human thing isn't just a lame storytelling trick that cheapens the character.
I especially love this line: "The pale, skinny boy day-dreaming in the back row becomes, suddenly and unnoticed, a heretic."
I want to compliment you on all the Doctor Who stories on this site. They're all fantastic! People tend to shy away from investigating his inner workings (which reminds me, I particularly liked 'Half Human'! That was a lark), and you do it awfully well. Thanks for writing!