Heyhey look I've got it up early. Enjoy!
The atmosphere of grief hung around the TARDIS like a bad smell. Each occupant dealt with is differently. Clara and John found comfort in each other. The doctor and the impossible girl. Like Amy before her, sometimes the adventure was too much, and she needed someone secure and stable in her life. The Doctor found comfort in the TARDIS herself, tinkering with the old girl or reading in the library at regular intervals. That was how he always coped with the pain and guilt he always felt after losing a companion. However, they all slowly moved on. Except for Sherlock. Sherlock was inconsolable, refusing to leave the room where Molly had taken her final breath. He wouldn't move wouldn't eat. He simply sat in a chair, deep in his mind palace. He had given his heart to Molly, and Moriarty had burnt it. His heart was lying dead on the slab in front of him. After 3 days, John and the Doctor found themselves back in that room, and John decided to say something.
"Can't you take the TARDIS back and save her?"
"It's against all laws of time and space. The paradox would be huge"
"But you could?"
"Technically yes, but it would involve the collapse of this time stream. Literally, everything would unhappen. And for the paradox to be sustained, one person would have to bear the brunt of this paradox. I wouldn't wish it on anyone, literally ceasing to exist is worse than dying."
Unknown to either of them, Sherlock had overheard this short conversation. And around it he began to make a plan.
Sherlock opened his eyes for the first time in 5 days. He had a plan. He knew what he had to do. He stood up, a little wobbly on his feet, but he strode purposefully from the room. He had discarded his coat long ago, it being covered with Molly's blood. His top was crusted with dried blood, but his skin was clean and pale. After a week with no food, his face was gaunt and pinched and he felt weaker with every step. He could barely stand, sometimes staggering into the walls for support. He found Clara and John's room first, quietly locking them in. he then headed for the library, where he knew the Doctor would be. The TARDIS kept changing, trying to throw him off course. She knew what he was doing, and she didn't like it. He could feel her in his head. He showed her his memories of Molly, of his wife, of his love, of the first time he realised he loved her. He felt her relent. The door was right up ahead. Sherlock allowed himself a small smile. The locked it. He could hear the Doctor running across the room, and starting to bang on the door.
"Sherlock, no, what are you doing?"
Sherlock didn't reply. Sherlock turned and began to run. He reached the console room almost immediately. He had memorised the controls, having noted exactly how the Doctor had done it the first time he had been in the TARDIS. He felt tugs at his mind. She, the TARDIS, was helping him! He pulled leavers, pressed buttons, looking rather too much like the Doctor for his liking. But he knew where he was going, rather unlike the Doctor. The ship started to shake, and the Doctor burst in, closely followed by John and Clara.
"Sherlock! What are you doing?"
The ship rocketed about.
"Changing the future" Sherlock shouted as he was thrown about "it's called marriage"