Artwork by the wonderful LiaAqila! Thank you for letting me commission you for this story!
I am aware that the characters are humans in the picture when they are written as anthros, but shhhh, the art is cute and it fits the story.

Feeling lonely and a little bored one day, Rainbow Dash invites Twilight Sparkle, Pinkie Pie, and Applejack over to stay the night. However, as the sun trades places with the moon, hoodies turn into pyjamas, and sobriety turns into tipsiness, silly antics are bound to ensue.

The four ponies find themselves in a game of Truth Or Dare, initiated by Pinkie Pie, of course. But almost as if she had planned it, Pinkie asks Rainbow an oddly specific question when her turn comes around.

"Dashie, do you like being tickled?"

Little does she know that this question will send all four of them down a rabbit hole of discovery, as Dash's affinity for tickling slowly becomes the focal point of the whole night. That Wonderbolt is going to soar far above the clouds, carried on a wave of squeaky laughter induced by her best friends. Turns out Dashie ain't so tough when she's begging for tickles, and the more her delicate body is teased, the more of it she needs.