Image imported from derpibooru
Original Description:

Twas the night before Hearth’s Warming, as one might infer.
Where two ponies awake caused much more than a stir.
But not by some foals trying to unwrap what was theirs.
The commotion was caused by two adult mares.
Some giggles and squeals came from Pinkie Pie.
But the loudest of laughs were from Fluttershy.
The pegasus was tied up on Pinkie Pie’s bed.
With ribbons as rope to keep arms and legs spread.
Her wrists and her ankles tied up with a bow.
It was as festive as holiday bondages beds go.
Pinkie’s fingers attacked poor Fluttershy’s tum.
Tapping and tapping, like playing a drum.
She scribbled her fingers up to her armpits.
To send Fluttershy into even more giggle fits.
Pinkie tickled her sides and she tickled her hips.
As more and more laughs came out Fluttershy’s lips.
But don’t mistake this for a torturous scheme.
For Fluttershy, this was a Hearth’s Warming dream.
To be tied up and tickled made Fluttershy shiver.
This was by far the best gift Pinkie Pie could deliver.
And Pinkie Pie loved making Fluttershy giggle.
To make her scream out and to see her toes wiggle.
Pinkie got close to those big yellow feet.
And settled on down for a Hearth’s Warming treat.
Flutters let out a gasp as her whole body froze.
As Pinkie made eggnog drizzle over her toes.
As the eggnog dripped down, Pinkie had to be quick.
She stuck out her tongue, and gave them a lick.
Fluttershy screamed out, face red as a cherry.
All these licks and these tickles had made her so merry.
And just when she thought that Pinkie was done.
She gasped and exclaimed “Hey, you know what’d be fun?
When the sun rises up, let’s invite all our pals!
You’d LOVE to be tickled by all of us gals!
Like AJ and Rarity, I could give them a call!
And Dashie! And Twilight! We can invite them all!”
To be tickled all day ‘till her mind turned to mush.
The thought of it all made Fluttershy blush.
“Before all of that,” Pinkie said, feeling vexed.
“Which tickle spot should I focus on next?”
But she heard Pinkie say, to fill her with delight.
“I’ll just tickle them all! You’ll be laughing all night!”