Part 1
Part 2
Part 3 ––> You are here
Part 4

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Twilight felt the fleshy walls start rhythmically kneading her upper body.

Seemingly reading her student’s mind, Princess Celestia explained:
“I need to loosen up a bit and <mmm…> your body rubbing against mine feels <ooh…> simply divine… Also, I think we’ll be more comfortable in my bedchamber.”

It was the most compromising position that Twilight could imagine. Not only was she stuck inside Princess’ royal rump, but her own hindquarters were clearly visible to the whole world. Speaking of which, her rear end was becoming increasingly hot… and wet… Oh no.

A yearning to shove a hoof between her legs was growing stronger and stronger, but with Twilight’s peculiar position, she couldn’t do anything about it at the moment. Fortunately, the unicorn’s inner turmoil came to an end only a few moments later, once the princess stopped her kinky canter and spoke up:

“Alright, we’re here. I’m ready to go all the way now. With your upper body already inside, you’ll be able to help me quite a bit.”

Twilight felt something firm and covered in fabric press against her bottom. She pushed against this support and wiggled her body trying to free her hips. After a few moments, she heard a loud <plop!> and slid forward. Wiggling some more, the unicorn was able to drag her hind hooves and tail inside. Finally!

Not wasting any moment, the horny mare tried to get on her hooves and find a suitable position for some (not quite) alone time. However, here actions were interrupted by her surroundings rapidly shrinking.

Fleshy walls pressing firmly against her whole body, Twilight was squished in a prone position, hooves cruelly pulled away from her coveted bounty. Being denied relief from her burning need, the purple mare groaned in frustration.

Meanwhile, Princess Celestia gently laid down on a royal bed. Her crotch was burning as if the suns on her flanks were real, but the alabaster alicorn was using all of her willpower to stay composed. She wanted to savor this unique experience. Having a living being inside you, stretching you, moving and pressing against your most sensitive spots, was giving a kind of pleasure that she had never experienced in her long life.

The pricess rolled on her back, legs in air, pressed her hooves against both of her entrances and started giving them some gentle, loving rubs. With the alicorn body being so long and her rump being of above average size (especially now, with Twilight present inside), Celestia had to stretch quite a bit to reach her moist parts. Using hooves wasn’t very comfortable, but it was the best way to pleasure herself in this situation. Using magic on something as delicate as her mare bits, while her mind was filled to the brim with lust, wasn’t a good idea. Besides, magic touch has always felt so… impersonal.

Twilight Sparkle was silently fuming. She could hear her mentor’s increasingly loud moans. Apparently, Princess Celestia was having the time of her life, while Twilight could do nothing but listen, while her marehood was on fire.
Suddenly, a convulsion wave went through the surrounding flesh and the purple mare felt a part of it rub against her vulva. Of course! She managed to spread her legs a bit and started moving back and forth. At long last, she was getting some proper stimulation.

“Oh! T-Twilight, this feels amazing…” - Celestia exclaimed.

More muscle contractions came, each one slightly faster than the last. Twilight increased her pace, feeling the sweet relief getting closer and closer. Unexpectedly, she felt a presence of some object on the other side of the wall she was rubbing against. It started vibrating and the unicorn’s whole body shuddered. She was getting close…

Suddenly, Twilight heard a piercing shriek. If not for the soundproofing spell, it would probably be heard in all of Canterlot. Fleshy walls started rapidly squeezing the purple mare. This unusual massage combined with Twilight’s mad rubbing finally pushed her over the edge. She came with a loud scream, her juices spurting out and dripping on the princess’ insides.

Completely spent, the most well-read pony in Ponyville let her mind wander.

Oh my gosh, I just had sex with Princess Celestia!
Wait, does this even count as sex? If so, this was the weirdest kind that I could imagine.
At least I didn’t have to worry about making a mess.

The feverish activity around her seemingly ceased. Twilight closed her eyes feeling utterly exhausted. She was glad she had got intimately familiar with her beloved mentor, even in such an… unusual way.

Celestia’s gentle muscle movements lulled the unicorn to sleep.
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Created using the ZoinksNoob model available on HuggingFace

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