Jim and John hook up at a pub around the beginning of series one.
They become fuck buddies.
And then eventually a couple, and they don't really talk about work when they are together...
And the purpose of it all was to create drama on the fact that they like/love each other, but they find themselves at different sides of a battle field.
The idea is that now we have to do the scene at St. Bart's where they meet Jim from IT? Well but this time it's the AU version and it is when Jim discovers that John is actually John Watson, the best friend of his arch enemy, and John sees Jim with Molly and thinks he is cheating on him.
Maybe we will do an alternate version of the Great game as well, depends on how the drama will unfurl.
We need a Sherlock for the scene in St. Bart's now. We don't need a particular Sherlock, up to you really if you want him to be jealous/possessive or uninterested.
He would have probably realized John is going out with a guy in secret, but at the time they don't know who Moriarty is, so they have no clue about that part...
The way I saw it in my head was Sherlock being all 'gay' to Jim like in canon , but then noticing the tension and maybe being 'so gay he is fucking my John' or something...
Well, we really need a Sherlock, so please please anyone?