Looking for arranged marriage fic

[cyeager.livejournal.com]

I'm trying to locate a fic I read on AO3;It's an AU where Mycroft arranges a marriage between Sherlock and John. Sherlock falls in love with John but John thinks Sherlock's just going along for political reasons. I have a vague recollection of references to the Holmes family being aristocrats or maybe even royalty but the Watsons are a lot further down the social scale so it's a surprise that John is chosen to marry Sherlock.