Thicker than Water 4/?

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: This might be an R... it mentions Drug use and beginnings of withdrawal. 
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 this chapter
Notes: For a prompt on the kinkmeme. 

I'm not too sure of this chapter... This was all written using research and I don't know if I did it justice.

Thanks to elvendork_lee for betaing!

 

( Stupid, God Damned Mycroft. How dare he?! )