The two men stood on the curb, John falling back into his military stance, Sherlock hunching somewhat uncomfortably."It doesn't have to end this way," said Sherlock.

John sighed. "Yes, it does. I know it's hard for you to understand, Sherlock, but when you love somebody as much as I love Mary, you would do anything to be with them. It's not even ending; I'll still phone you all the time, yeah?"

The cabbie honked its horn, and as John turned around Sherlock let slip across his face a brief flash of pain, of intense emotional pain, of longing and loss. He steadied as John looked at him again.

Sherlock cleared his throat awkwardly. "And what happens if… I need you?"

"Just give me a call, I'm only twenty minutes away, replied John, sadness with traces of guilt and anticipation dancing across his features. He looked up at Sherlock. Sherlock looked down at him. The cabbie honked again. John jumped, and opened the door. He sat inside and rolled down the window, looking back out with a small sad smile at - nothing.

Sherlock fled back up the stairs, disgusted with his lack of composure. He watched from the windows as John looked around confusedly then resignedly sat back and was driven away. Sherlock allowed himself only one tear for his army doctor, his doctor, his Doctor Watson. And he rose and picked up his violin, and played the melancholy variation of John's song he had never gotten the courage to play.