If only it stopped there! But then it happened again, and then again. Sweetie Belle felt overwhelmed by the mysterious dreams of Luna that would make her feel that way, and make her body do those things. They would come without warning, and she would always awaken with that shaking clutching feeling that made her feel so good, but made it hard to even move when it happened to her.

It would have been bearable if she’d been able to get any sleep at night, but the dream princess seemed to love to torment and torture her, stroking her so lightly like a delicate flower keeping her just on the edge of going over. She would awaken in the middle of the night, breathing hard and flushed not just in her face, but in her bottom too, and just have to sit there trying to calm down.

The only time she was allowed to finish, it was always during the day in the most embarassing situations. Sweetie Belle was so tired from not being able to sleep at night that she started drifting off at the slightest opportunity, and that’s when it would happen. Again!

That’s why she was standing there not obeying Rarity’s request to, “Come on then, Sweetie.” They were in the fabric store as Rarity pondered at length over various bolts of cloth, when Sweetie fell asleep standing up. Her dream didn’t rob her of her body this time, but everything was never brighter in these than moonlight. The teasing swipe against her hindquarters made her tail lift up in the air, just like it always did when she was touched there, even if she tried to hold it down. Sweetie spun around trying to find the dream princess, to protect herself somehow because– because Rarity was right there! She couldn’t do it here!

It was to no avail though, for the dream princess’s magic kept the object at hand floating just outside of Sweetie Belle’s vision. It wasn’t a pony, but just something long and thick and dark that gleamed in the moonlight. A moment of distraction and it slid across her hot folds again, and once again her tail shot up on its own. Sweetie Belle felt her resistence crumbling the more it touched her. She couldn’t stop thinking about that feeling at the end, and it was harder and harder to think about how it was wrong or a bad time to do this. At last when it touched her, she just stood there closing her eyes, the smooth slickness fulfilling a deep desire as it slid along her down there.

It was twisting back and forth in her crinkles of soft skin, the blunt tip prodding her strongly enough that Sweetie Belle had to brace her hooves against whatever it is she was standing on. She couldn’t believe how good it felt to be touched there. It was hot and slimy, and wonderful! And then it–it was like– it was pushing through her it was going into her she couldn’t stop swallowing it up into her... her...!

Sweetie had learned not to cry out when she awoke like this, but she had to gulp a swift intake of breath as the mysterious object had vanished, but the memory of that pushing sliding stretching feeling still stayed with her, making her bottom fill with an incredible something as it lit up inside her like lightning in a jar. Rarity turned to her and said, “Come on then, Sweetie,” and Sweetie Belle tried to stop it and calm down, but then she felt the squeezes start, and all she could do was stand still where she was, looking at Rarity apologetically as her bottom rippled convulsively, secretly, and deep inside.

“Sweetie, come on,” Rarity repeated irritatedly. Sweetie wanted to obey her sister so bad, but she was afraid if she took even one single step she would collapse. Her vision scintillated as the waves of pleasure crested over her. She loved how she was feeling, yet she wanted to cry as Rarity trotted back to the frozen filly saying, “Sweetie Belle, what’s wrong?” in such an alarmed tone.

“I’m f...” Sweetie wanted to say she was fine, but she couldn’t even whimper out two words before she had to breathe in, her breaths coming short from the intensity of the feeling. And her sister could see it happening! What was she seeing? “Fine...” she managed to say with great effort. Taking any action other than being passively receptive while this was happening was very difficult for her.

“You are most certainly not fine,” Rarity exclaimed kneeling down beside her, “I think my sister is having a seizure!”

“It’s almost... over...” Sweetie said feeling surprisingly disappointed at that, but her nether regions were at last calming down. She turned to Rarity and tried to smile, her back legs were still stiff and her butt high though, and her tail was bobbing slightly in the air. It was far too late to save face with her sister. Now even Rarity would know that Sweetie Belle is some kind of freak who can’t stop doing the bottom thing always.

At last Sweetie Belle wrested control of her entire body again. She still felt tingly all over though, like she could go off again at any minute. Sweetie calmed her beating heart down by putting a hoof on her own chest, breathing in, then moving her hoof out and exhaling, just like Twilight taught her. She managed to turn to face a frantic Rarity, ears drooping, and said “S-sorry I tried to stop, but it just keeps happening!”

“This isn’t the first time this has happened?!” Rarity uttered in horror.

“N–n–” Sweetie was becoming acutely aware that Rarity was not the only pony who had noticed something was up. The other patrons of the fabric store were looking at her strangely, with expressions varying from disdain to concern. “It’s really embarassing,” she said to Rarity, “I d-don’t want to talk about it here.”

“Sweetie, this is important,” Rarity insisted strongly, “This could be a very serious matter, even of life and death!”

“But...” Sweetie protested shrinking down and looking in other directions. “But it’s... it’s about my (bottom).” The last part she whispered.

“Your bottom?” Rarity said cluelessly and way too loudly. Sweetie blushed so hard she thought she was going to die. “What do you mean your–” Rarity cut off abruptly. When Sweetie risked a look, Rarity’s ears and expression had gone flat with exasperation. Oh no, but Sweetie didn’t mean to–it was an accident!

“We are going straight to the boutique,” Rarity said in a hasty tone, “And we are going to have a nice cup of tea, and you are going to tell me exactly what has been going on.”

“I’m sor–” Sweetie started to say but Rarity’s hoof came down against her curls and patted her gently.

“You’re not in trouble, Sweetie,” Rarity said with a sad smile. “I just need you to be honest with me, and we’ll work out what’s going on.”