Weird didn't even begin to describe Rarity's day. The first thing she knew about things getting crazy was a kind of odd vine pushing through the portal to Equestria. She, and her friends, didn't think about it at all until they were practicing their music and bam, tentacles bashing down the music-room's doors.

Pinkie, Fluttershy, Dash… all her friends were grabbed one by one but, in a great spot of luck, their performance had made her pony out even more than usual. Instinct drove her horn blasts as she drove the vines back long enough to bail through the window. Left and right she was watching as her schoolmates were grabbed up in the vines, subdued, stripped and… Rarity really didn't want to think about it.

There was only one place to go, auto shop. It took a few minutes, but soon she was prepared to do battle with the crazy kudzu and try to rescue her friends. Opening the door, Rarity was pushed backwards by the mass of tentacle-vines that were leaning on it.

"My outfit! You are going to pay for that!" Rarity ignited her torch, slicing neatly through the vine that had torn her dress free. She froze, however, at a very new sight. "I never ponied out like that before…" Her free arm—the one not sporting hot, burny death—reached down to her pony-like phallus. The vines seemed to have the same idea because they suddenly redoubled their efforts, grabbing her arms and legs, pulling her up and off the ground.

"You can't stop me, I am Rarity!" She swung her torch at another, slicing it just as it grabbed her deadly limb. She never saw the thick, oddly bulbous tentacle as it slithered over her shoulder and down to her groin. Her cheeks suddenly lit in a blush as that stallionhood was kissed by the opening tip of the vine and it shoved down, pushing back the odd pony-sheath and exposing her growing member to its insides.

"Wha… oh darling… don't…" Rarity's eyes crossed as she slumped into the grip of the vines. The thick shape massaging her new shaft had it at full attention now, and while Rarity was really starting to enjoy the ministrations, she was shocked as something pushed down inside her shaft. "Oh my!"

The tentacle was so thick she couldn't see the small eggs pushing down it, but boy did Rarity feel them. Her phone, the latest top-of-the-range wrist model, bleeped and projected her friend, Pinkie. "Darling, have you-" Rarity's words died as she saw her friend, apparently sporting a similar pony cock, similarly being stuffed with the tentacle's offspring. Only Pinkie's mouth was stuffed with a tentacle and her belly had a bit of a bulge.

"I wonder if it is going to do tha- Mmfmfmmfmm!" Rarity's mouth was stuffed, a thick tentacle now leaking fluid down into her throat. She had a choice, swallow or drown, it was an easy one to make. The more of the thick, honey-like goop she gulped the hotter her new shaft seemed to feel and, in minutes, Rarity was mindlessly humping into the strange plant, just like her friends.

Author's Note

Why, ten-tickles, of course!

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Awesome ponies who are already helping to keep me in keyboards and rum:
Canary in the coal mine
Daremo
Mary Rowland
Boulder
A.P.O.N.I.

And special thanks to the following, for careful eyes and friendly words:
Daremo
Vutava