There was silence for a moment, before the sound of magic being used was heard again. Dash grunted at this, and Fluttershy began to get slightly panicked. The gurgling in their stomachs was getting louder now.

"Please... stop..."

Fluttershy said, hoping it'd have some effect. There was partial fear in her voice, and Rainbow Dash picked up on this.

"It'll be fine, Flutts... Just a bit of... you know..." She looked up to the diaper she was wearing.

Fluttershy nodded quickly, knowing her friend was right. It'd just be a little bit of an accident is all. A fast approaching one, too. Rainbow Dash soon realized that something was trying to push out. She tried her best to hold it in, but in shock, she could do nothing.

"Oh god..."

Things were going similarily for Fluttershy. She tried her best to hold it, but she just couldn't. She whimpered.
First, Rainbow Dash lost any clenching or control of her bowels, and shit spilled out into her diaper. Due to the fact that she was upside down, it pushed up and then smoothed out against her rump, some of it getting in her cunt. All she could do was stare in shock as she filled her diaper, although part of her was enjoying it...

Fluttershy on the other hoof, was feeling rather exposed. She crossed her legs in a furthermore futile attempt to stop herself from filling her diaper. The vibrator made this even more difficult for her, making her randomly spasm, forcing the shit out at a faster rate.

For a sudden moment, the shitting stopped. The two looked at each other, confused.

"What happened?"

"I... I think they're done..."

"Wouldn't they have told us or something?"

"I don't know..."

It was silent, before Fluttershy crossed her legs again, and whimpered.

They were far from done. A soft, and very quiet sound was heard. Not so quiet you couldn't hear it, but it was there. Fluttershy blushed heavily, as she pissed herself, adding onto the pile of waste. Rainbow Dash knew that she was next, and tried to hold it, only to fail seconds after.

"Euck... How long are they gonna keep this up..?"

She was becoming uncomfortable.

"P...probably for a while..."

whilst Fluttershy was realizing that it was becoming futile to resist this.

Author's Note

Picture this chapter is based on - https://derpibooru.org/1117688