BBC AU Request!

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Hey all, I'm trying to find a fic, I think on AO3, in which a teenage-ish Sherlock babysits a young John. It's a pretty long fic, and though it ends up as Sherlock/John, none of the relationship stuff happens until the story catches up with the canon timeline and John, though younger, is well passed the age of consent. It deals a bit also with Sherlock's drug addiciton and John's stepfather being sort of a dick and sending John off to military school when he's still quite young. I remember there's a bit just before John gets shipped off for Afghanistan when he realizes he's in love with his former babysitter and tries to go confess to Sherlock, only to have Sherlock's surprise boyfriend Victor Trevor (who's an asshole) answer the door (and act like an asshole). I know it's vague, and it probably sounds similar to several of the stories like this, but I really enjoyed it and if it rings a bell for anyone I'd really appreciate.

Also, any other babysitter!Sherlock/younger!John stories you can think of are also appreciated. I really love that trope!