It had been over a month since John had seen Sherlock, so when the man called him requesting help on a case, John had leapt at the chance. He would never dream of admitting it, but he missed his best friend and he missed seeing him every day. Life with Mary was nice, but sometimes he wished there would be an explosion in the middle of the night, or a random madman chasing them.
Sherlock was already to leave and halfway down the stairs when John arrived.
'Were you going to leave without me?'
'You were taking too long.'
'Sherlock, I was literally two streets away.'
Sherlock rolled his eye, 'Are you ready now?'
'Give me a minute, I need to use the bathroom first.' John pushed past Sherlock with a laugh, half expecting Sherlock to have left before he came back. He was still laughing when he closed the bathroom door.
But he stopped laughing immediately.
The little white and blue box was all he could look at for a moment, and then he stepped closer and lifted it, finding only one test still inside. He took a deep breath before he looked down at the bin under the sink, and his heart sank.
When he opened the door Sherlock was standing in the middle of the living room instead of the stairs where John had left him. He was biting his lip nervously, poised for flight. John took a step towards him.
Sherlock didn't respond, he just glanced down at the carpet, and then around the room in what John had come to know as his nervous, and sometimes guilty gesture.
'Sherlock! Look at me.'
John clenched his fist to tamp down the flare of anger, and took a deep breath before he spoke, 'You know why. Who-'
'Don't be so stupid, John. You know who.' Sherlock snapped, suddenly angry.
'I don't exactly make a habit of one night stands. That's ancient history. I don't do that any more.'
'The fact that I am currently carrying your offspring would suggest otherwise.'
The reality was really starting to sink in now, and John scrambled for something that would prove it wasn't happening.
'But that was once. And it was months ago before...oh god.'
'Before you got married and impregnated your wife.'
John sank down in the chair and covered his face with his hands, 'Mary...'
'That's all you have to say?'
'What would you like me to say?'
'I dunno...that it's a mistake, that the test is wrong.'
'This is the seventh day in a row I've checked. You should always replicate your experiments to-'
'This isn't a fucking experiment Sherlock! This is my life!'
He was on his feet again, pacing the room, gesticulating wildly as Sherlock just watched him in silence.
'I don't want...I can't Sherlock. I don't want this. I don't want it. One mistake isn't going to ruin my life.'
Sherlock flinched slightly away from John, his eyes narrowed as they took in John, the expression on his face unreadable, as if he was trying to work something out. As if he had no idea who this strange person in his flat was. Then he nodded, just one sharp nod.
'I'll take care of it.' And then he turned away for the stairs again.
'Oh hell no! You don't get to walk off that easily!' John was reaching for his elbow, but Sherlock pulled away and kept walking, 'Sherlock!'
But Sherlock was already running down the stairs, 'Case, John.'
'Sherlock! John struggled to keep up with him, 'We need to talk about this.'
'I said I'll take care of it!' and Sherlock stepped out into the street, hand already raised to hail a cab.