Looking for a fic...

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Hi, I remember reading a Sherlock (TV series) fic ~1 year ago, in which there's some sort of virus apocalypse. There's a safe place being built, but Mycroft can only get three spots for himself, Sherlock and their mother. Sherlock refuses to leave John, so John drugs him and lets Mycroft take him to safety - but Mycroft sends John a note telling him that he's immune to the disease, and good luck.

Years later, the survivors start reaching out to the outside world, and as part of a deal he made with Mycroft Sherlock is the first one out. He meets Donovan and Lestrade, then finds John in Australia with a character meant to be the counterpart of Doyle, who is John's co-writer.

Does this ring any bells for anyone?

ETA: Found!