Joan,Sherlock and a couch

This is a continuation of the last story but is set about four months after.

Joan woke with sunlight coming through the window, it was beautiful. She looked over and saw Sherlock's half of the bed was empty. She put on her dressing gown and went downstairs.
'Sherlock?' No one answered, he must be out. She picked her bag up off the table and checked her phone, there was a text from him.
Sorry i'm not there, Gregson needed a hand with a case. Make it up to you tonight. Love you.
She smiled then went into the kitchen to get some coffee. She went and sat down then she got a call from her mum.
'Hey mum....

They both sat in Gregson's office as they questioned Oscar about the drug dealer, they hadn't said a word to each other since leaving the brownstone. Sherlock could tell when she was annoyed with him, he had seen that look many times. He moved closer to her and buried his face in her hair.
'Joan, please, talk to me.' He kissed her shoulder. 'I'm sorry.'
She sighed.
'I know you are, but you've been keeping more secrets from me first it was Irene, then your brother now this. How many more can i expect?'
'No more.'
'You sure about that.' He placed his forehead on her shoulder, not wanting to look in...

“Stay,” he said.
That was the second time Joan Watson’s world had stopped in her whole life. She was about to leave Sherlock and move on to another client, and she had been in that situation thousands of times- the fact of leave a client and then go to another was common for her, it was a routine. But for some strange reason, she couldn’t leave Sherlock so easily. She had become a way attached to him, they were friends? Joan wondered, but then she remembered that “Sherlock Holmes doesn’t have any friends.” She couldn’t help herself and imagined how a day without Sherlock could...

Sherlock saw at least 3 different exits from where he stood but all were to far to hatch an escape attempt that wouldn't involve a casuality. He knew what is was like to be shot but didn't want to experience it again. He checked his watch it was ten to eight, he needed to send a signal to Gregson but how? He looked round him for something that could help, he noticed a button the right hand side of the wall which could be the buildings old whistle to alert the men work was finished. But getting to it would prove to be a challenge.

'Which one of you is lying?'
'Micheal we've been doing buisness...