This was started with the intention of posting in honour of Martin Freeman's birthday on September 8th, but I lost my way with it and didn't manage to finish it until tonight.
It is styled after the poem, A Visit From St Nicholas by Clement Clarke Moore (1779 - 1863) so my thanks go to him for the inspiration, and also to ACD & BBC, Moffat, Gatiss and Thompson for use of their creations.
As ever, Thanks Mrs Pencil for your endless encouragement - especially with my poetry :)

~O~

Twas the day of John's birthday

And all through the flat

Came the sound of a violin

Never played flat

~O~

The first song played merry

The second played sweet

The third was a fanfare

To declare 'time to eat'

~O~

Mrs Hudson this morning

Had baked him a cake

A glorious confection

The best she could make

~O~

Mycroft was invited

To all he declared

He'd put diet aside

If John's cake would be shared

~O~

Sherlock's eyes rolled

And he said with a sneer

That Mycroft's as round

As a barrel of beer

~O~

John opened the wine

And filled every glass

Gave one glass to Sherlock

Then called him an arse

~O~

He begged him behave

And be nice to his brother

Or he might find John

Has moved in with another

~O~

Sherlock just smirked and

Said it would not be

"For you will not find anyone

Smarter than me!"

~O~

Greg joined the party

And hearing that said

Declared that John's praises

Had gone to his head

~O~

He told Sherlock plainly

That this was John's day

And if he should ruin it

They'd lock him away

~O~

But John intervened

Gave his friend Greg a grin

And begged him ignore the mood

Sherlock was in

~O~

The last to arrive was

Their very good friend Molly

The party was now in

Full swing and quite jolly

~O~

Some hours later

With morning in sight

From 221B

They wish all a good night.