This is lovely! I love how you've used the song, especially the turn about from Eight to Ten, then finally Eleven and the Master writing books. It's a fantastic circle, and I'm glad I could do my part to spark this. Though the magic is truly all you!

Also, I loved this bit:

and whose irritating presence grounds the Doctor when nothing else can, when he feels too much like a legend, and not like a man: because legends don’t have irritating older brothers.

<3