Funny, it was the other way around for me. The Mycroft/Sherlock made sense to me, since they were basically two halves of one person. I just wasn't sure if I should call it selfcest or masturbation. *g* The Mycroft/John thing was a bit surprising at first, but then it clicked - for the same reason.

I love (re)reading this fic. It's a great example of how creative AUs can be and still feel in character.