Elementary, my dear
Ah, Sherlock Holmes. The smarty-pants detective (who never liked women much) is always portrayed as tall and agonized and youthful (see Christopher Plummer in the [bad] movie Murder By Decree, for example). His sidekick Dr. Watson is always older, kinda dumb, and protective. Watson is daddy, really. (Daddies desperate to take offence who want to think I'm saying they're all as stupid as a box of rocks should get over it.) Mind you, Watson "biographer" Michael Hardwick, in his 1983 book "The Private Life of Dr. Watson," makes Holmes into daddy. Watson states: "Least of all did it dawn upon me then that in finding him I had discovered the father substitute for whom I had been so long and unwittingly seeking." I'm sure there's lots of Watson Holmes slash fiction somewhere out there, but no, I'm not spending a hour of Internet time running it down; I rely on the kindness of strangers. Urls, anyone?