Long Way Home
In a society where your secondary gender is diagnosed and your mate predestined at birth, there’s little need for romance. You will find your mate one day and fall into the role you were diagnosed at and live happily ever after, or so it says.
When they’re diagnosed, Sherlock and John are both too young to understand the implication. They’re part of the 0.1 % diagnosed before their 17th birthday, forced to grow up quickly to keep up with their bodies. And they don’t know it yet, but they’ll also be part of those unfortunate fellows who will only meet their mate after their 30th birthday.
And while Detective Inspector Greg Lestrade is more than happy to finally be diagnosed as an Alpha, Mycroft Holmes could have lived forever without the world knowing he was an Omega. But they’ve not been asked, so they make do.