"John…John…John…Jo-"
"What is it, Sherlock?"
"I've decided something"
Turning away from his laptop screen, the ex-army doctor sighed and looked at the Consulting Detective, sprawled out on the sofa plucking gently at the G-string on his violin.
"Have you really?"
"Yes.. I've decided, that I'm never going to die."
You're, never-"
"Never going to die, that's right. Just think about what would happen to the world if I did die, it would be chaos"
John raised his eyebrows and pursed his lips
"That's not how it works, Sherlock. Everybody has to die sometime"
Standing up, Sherlock plucked the violin bow from it's stand and started to play a gentle harmony, whilst pacing up and down the living room
"I'm not everybody though, John"

John smiled, turned back to his laptop, and opened up a 'New Entry' for his blog.
Sherlock Holmes: The man who will never die.
I'm sure some people in the world may be glad to see the back of Sherlock Holmes, but I'm not one of them. Sherlock has just stated to me that he 'will never die', and I know that he isn't joking. Despite what people may think, Sherlock Holmes is a good man, and maybe, sometimes- even a great one.
John clicked 'post', and shut the lid of his laptop.
"Right then, Mr Immortal- tea?"