Johnlock Fics based on the Downey films
Broken Substitutes by zarah5 (34K, E, Johnlock)
Death and loss, hurt and comfort, Moriarty, drugs, addictions and sex that is a means to an end, until it isn’t anymore. Also: a couple of scientific details that might require a suspension of disbelief. (Post-movie, with several elements stolen from the books.) (See other works by the same author.)
History, Repeating Itself by gyzym (45K, M, Johnlock and Adcroft)
John Watson is a med student, a war veteran, and, by and large, a fairly sensible person. He had every chance to run. (See other works by the same author.)
Marriage á Trois by Sorrel (33K, T, Johnlockary)
In the aftermath of the Blackwood case, Mary determines that if she wants to have a successful marriage, she must find a way to integrate Holmes into her relationship with John. It's a decision that will have a number of unforeseen consequences, as she becomes far closer with the famous detective than she ever could have imagined.
Mistakes of Our Youth by candle_beck (31K, E, Johnlock)
It's the backstory; it's how they got here. (See other works by the same author.)
Proper Incentives by Jen Lee (jenlee1) (15K, R, Johnlock)
A reflection on useless regrets and impossible choices, and the price of an error in judgment.
Roll Away Your Stone by foxxcub (39K, E, Johnlock)
Seventeen-year-old John Watson is set to finish his final year of school with a flourish, until the headmaster assigns John as a "tutor" to an arrogant, yet brilliant new student named Sherlock Holmes. Holmes is not about to be put in his place by this popular rugby football player with the too-blue eyes, and John isn't going to let this impulsive fifteen-year-old get away with anything. Neither expects to become friends, but a series of unexpected events and a possible murder mystery bring them closer together than either of them thought possible. (See other works by the same author.)
Soldier's Heart by Piplover (85K, E, Johnlock)
After his return from his three years' "death," not all is as it should be for Holmes. The road is long ahead, but Watson will always be there to walk it with him. (See other works by the same author.)
The Subtle Art of Misdirection by fourleggedfish (33K, E, Johnlock)
Based on a prompt from the Sherlock kinkmeme: "Holmes has been missing for a few days or weeks. Watson is finally LED to him. Turns out Blackwood has had him. Anyway, Blackwood tells Watson he has a choice. He (Watson) can either take him and Blackwood watches, or Blackwood will do it himself. Both know Holmes suffers from Genophobia (fear of sex) and is a virgin. Watson decides to do it, and fucks him like he's breakable (lots of soft words, gentle touches, it's going to alright, ect ect). I know. I'm weird. Dubcon and gentle fucking don't usually go hand in hand, but I want it :(" (See other works by the same author.)
These Things Were Promises by paperclipbitch (53K, E, Johnlock)
Watson has had to take a brutal course in being honest with himself so nothing Holmes says will ever be a surprise. (See other works by the same author.)
+ Plus I did an AO3 search for completed Johnlock fics over 10,000 words based on the Downey films and got 45 results. Enjoy!