They get married for a case.
Well of course they do, of course they get married for a case, however farfetched that is, and the only thing surprising about this is how long it took Sherlock to find a case for which to get them married. A little over three years is how long, three years since they met, but he’s only been keeping an eye open for one for the last year. It’s still surprising.
Rated G, asexual!Sherlock/straight!Watson marriage fic. 30 years of domestic bliss neither one of them expected (John less than Sherlock).