John was sitting in his chair at 221B Baker Street, scotch in one hand , phone in the other , trying not to worry . Sherlock had just gone out, dressed in those floppy grey sweats and scuffed trainers. He knew it wasn't for a late night jog. Sherlock was working a case, on a reconnaissance mission with his homeless network. This was Homeless Holmes, blending in .

Before, it could have meant something different . But since John had moved back in and made Sherlock swear never to touch the drugs ever again - no not ever , not if he wanted John to stay – well, there was some trust that needed to be rebuilt . God knows John was doing his part .

He had moved back to Baker Street six months ago, when Mary made him choose. She was moving to France with their daughter, Victoria. As an intelligence agent, Mary had never considered motherhood. It was fine to lead a thrilling, dangerous existence when yours was the only life in the balance. But now, what right did they have to risk their daughter's future ? Solving crimes , chasing criminals - hardly a domestic lifestyle. And even though Mary had tried to turn her life around, the hard truth was that even with Magnussen dead, they were not safe. Magnussen had sources, those sources were alive, and there was still a bounty on her head. For what, she would not say. There were so many things she hadn't told John , even now, it still staggered him.

She did say it was not her intention to kill Magnussen that night. John could intuit the rest . Interrogation at gunpoint, force him to reveal the location of her enemies, hunt them all down. That was Mary's plan, until Sherlock came bumbling in. He could tell she was still bitter. She had never thanked Sherlock for his sacrifice. John was relieved she did not move back to America , that would be too far. France was only a three hour train ride away.

John was working on his trust issues , trusting Sherlock . He was trying very hard.

He understood the value of Sherlock's homeless network, his "eyes and ears on the street", though John rarely met any of them. Many were hardwired against authority, and John was a liability in that regard. Though no longer a soldier , John still retained an aura of the military, in the purposeful way he walked, the way his eyes scanned for threats. So he did not take it personally when Sherlock did not invite him along.

There was one homeless person Sherlock actually wanted John to meet.

The night Sherlock suggested Angelo's for dinner, John did not notice her at first. He was picking at his pasta while digesting the particulars of an unusual medical case. The patient who presented himself to Dr. Watson that morning had a horrific case of bad breath. He reeked of garlic, but insisted he had consumed none. He suspected his girlfriend was poisoning his food, and the doctor was not so sure he was wrong. In fact, John was having difficulty enjoying his aglio e olio . Sherlock , as usual, had barely touched his bolognese, but his attention was elsewhere. He was staring at the young woman singing torch songs at the back of the restaurant. That was remarkable, a bit. John did not know Sherlock liked jazz.

As soon as John pushed his plate away half-finished, Sherlock immediately turned his attention to his flatmate . Problem ? John explained his sudden distaste for garlic. He went over the patient's particulars, observable symptoms, medical history. John enjoyed discussing his patients with Sherlock. Technically he should not, as he was breaching patient confidentiality, though he never revealed names. He was willing to blur the line, however , because this was one area where he felt at least on somewhat equal intellectual footing with Sherlock. They had both studied poisons and their effects on the human body, John in medical school, Sherlock in his spare time. Sherlock had even experimented on himself in the past, preferring first hand knowledge to textbook , but when John moved back in Sherlock quietly disposed of the odd little bottles in the medicine cabinet, and spared them both the lecture.

As Sherlock mulled over the symptoms, John could not help but smile. He had accepted long ago that he would never be as smart as Sherlock Holmes. Which was fine, by the way, John was a modest man. He could not deny, however, the tiny swell of pride he felt whenever Sherlock showed respect for his medical talents, as he did whenever they discussed John`s cases. He could share anything with Sherlock . No medical procedure was too obscure, no symptom too revolting. In fact, the more graphic the detail, the more brilliant Sherlock`s eyes seemed to gleam . John was grateful that he could give this to Sherlock, this intellectual sustenance. Unfortunately, a patient with garlic breath was not a great puzzle, and Sherlock quickly deduced arsenic poisoning.

They were discussing motives when the woman approached their table. She embraced Sherlock, and excitedly told him Angelo had hired her for the whole month . She had thanked Sherlock several times before he finally introduced her to John. Her name was Billie. She froze for a second before shaking John's hand, nervously. Then she gave Sherlock a quick kiss on the cheek , and returned to her microphone.

As she walked away, Sherlock explained that Billie was part of his homeless network, and had helped him with a few cases. She sang for money in the tube stations. She had an exceptional voice, but could not afford music school. Sherlock, who had taught himself the violin at age ten, advised her she did not need vocal lessons to pursue a singing career, she just needed a proper stage. Angelo had a piano and jazz night every Thursday. Angelo agreed to give her a chance, of course, anything for Sherlock.

The next Thursday Sherlock wanted to return to Angelo's restaurant, and even offered to pick up the tab. Billie was singing , of course, and John noticed she kept looking over at Sherlock, and smiling. It was a bit unnerving.

By the third Thursday, John was convinced that Sherlock had a thing for this girl. But, not really my area, isn't that what he'd said ? John thought she had a lovely voice, but was thrown by her affection towards his flatmate. He understood the lure of the human voice, the effect that Sherlock's voice had on him sometimes was alarming. What was it that kept Sherlock coming back ?

One song Billie sang with such heartbreaking longing that everyone's forks hovered over their plates, stilled by her voice. John recognized it, this was the one where she always glanced over to Sherlock, seeking…what ?

In suspension

Walking side by side

All the words unspoken

All those things left unsaid

Swirling around us

Like leaves

On a fall sidewalk

In suspense

I turn to you

To ask you

What would you do

If I kissed you ?

Would you turn away ?

What would you say ?

Maybe nothing at all

Please call my bluff

I've had enough

Of this dancing around

I want you

I need you

I'll love you

Always

John observed that Sherlock never spoke to him when Billie sang this particular song. He scanned for emotion but Sherlock would glance away whenever he looked. He was unreadable.

Billie did not come to their table after, had not since that first Thursday night. Nor did Sherlock seem inclined to speak with her, he just paid the bill and then he and John walked back to their flat. Sherlock was quiet. That was normal, but… John had a nagging feeling he was missing something.

The following Monday, by chance, he bumped into Billie at the chip shop. John took the opportunity to curve the conversation around to how she knew Sherlock. She met him at the tube station, where she was singing for shillings. He needed help with a case, wanted her to text him if she saw a man carrying a cane with a blue anchor tattoo on his right hand. Nothing more. No romantic interest , just a favor for a favor.

But that one song, so intimate, the way she looked at Sherlock …

" That song, you know" – John hummed a few bars - " It's lovely, what's it called ?"

Billie blinked. Twice. " Don't you know ?"

" Er…no. Should I ?"

Billie tilted her head, looked at him quizzically. " It's called Dear John. Sherlock wrote it."

John's heart stopped.

" He joined me at the tube station one day, brought his violin and played it for me. It was so beautiful, I thought…" her cheeks flushed slightly. " Well , for a second I thought the song was for me, until I saw the title on his sheet music ."

After letting the words swim through him, really listening this time, John finally understood.

All the words unspoken, all those things left unsaid.

Billie was staring at him. "I`m sorry, I thought you knew . He said it was for a friend, and when he introduced us I figured you must be the John. You didn`t seem to like the song, though, you hardly paid attention…"

That was why she kept looking at Sherlock. Am I doing it right ? she was asking. Seeking approval.

John remembered to inhale. With his next breath he realized Sherlock had found a way to speak to him, indirectly, through music.

In suspension.

That was why they kept going back. Sherlock had been waiting for the song to reach John. And now , as the words came crashing down, it took one more heartbeat to figure out why Sherlock had not just told him directly .

It was not just a fear of rejection. Sherlock had allowed space for John to pretend he did not understand. Did not hear . Or if he did hear , to dismiss it as circumstantial evidence. To let them continue on as before. A safe zone.

John tried to imagine how he would proceed under similar circumstances.

The next Thursday, at the end of their song, John leaned over and finally kissed Sherlock.

Angelo applauded loudly.