I like to think Mycroft toyed with a beard at one point, and was very disappointed to discover that his Holmesian black hair was tempered with Mummy's ginger hair on his face.

I love that he has cousins in "professions that are useful to him."

They may or may not make an appearance at some point, if convenient. :-D

Thanks very much! I love this verse a lot.

Thank you! I'm always happy to share my headcanon. I have far more than I ever use. :-)