Thicker than Water 1/?

Title: Thicker than Water,
Fandom: Cabin Pressure, Sherlock
Gene: Crossover, Drama, Hurt/Comfort, Kid-fic, Fluff
Character/s: Martin, Sherlock, Mycroft, OCs, (MJN and John show up later) 
Rating: PG-13, maybe a PG-15/R in later chapters mentioning drugs...
Summary: Sherlock's favourite brother hasn't always been there, but he's been there when it counts. For that matter, so has Sherlock.
Warnings: Mentions of Drug abuse in later chapter/s 
Notes: For a prompt on the kinkmeme. There's at least another two chapters written, with more to come. Thanks to elvendork_lee for betaing!



 

( Sherlock is four years old when he exposes his father's affair to his mother... )