After a few minutes of pissing themselves, the two stopped, their bladders seemingly emptied.

"Ugh... this is so embarassing..."

More silence.

An abrupt gurgle was heard from Fluttershy's gut

"Seriously? You're not done?"

"N...No..."

Dash rolled her eyes, but then she heard a gurgle coming from her own body. Fluttershy looked Rainbow Dash in the eyes, and began to open her mouth, thinking of making a snarky response.

"Don't."

Fluttershy quickly shut her mouth, but not before making a grunt, due to the still active vibrator.

Fluttershy stared off into space, letting her legs loose. This was a mistake, as she lost control of her bowels as soon as she did this, the shit making the diaper bulge further downwards.

"Sh... Shit..."

A quiet rimshot was heard. Fluttershy looked around, but couldn't figure where it came from.

Rainbow Dash, blushing, had an odd thought. BDSM had always been a fetish of hers, and right now, she was feeling a tad turned on by this situation, despite the fact that it tied into fecal matter. However, part of her had always wanted to explore this alternate concept. However, she never quite had the chance to do it. She thought more.

And that's when she thought "screw it."

She released the shit into her diaper, finally letting here muscles relax, letting it loose. Sweet release. As she did force it out, she let go of her entire crotch area, just focusing on getting it out. She ended up pissing more.

Fluttershy stared as Rainbow Dash promptly, and purposely, let go of her bowels and bladder, letting it fill her diaper. More and more filling Dash's diaper, it bulging out further and further. She decided to follow Rainbow Dash's idea, and let go, the shit filling her diaper too, all of it building up, the vibrator adding onto the experience.

The guards stared at eachother, shifting uncomfortably.

The amount of piss being released in Dash's diaper was now getting a bit excessive, some of it beginning to trickle out of the diaper, and along her coat, this in itself setting her off. Fluttershy's vibrator intensity seemed to kick up, and with this, she came, pissed, and shat into her diaper all at the same time.

After a bit of this, the two stopped. Dash's diaper filled to the brim with piss and shit. She had cum herself, due to the shit finding a way into her cunt, and acting as a makeshift entity to fuck her. Fluttershy had cum twice now, the vibrator being pulled out of her diaper, by magic. Her tongue fell out of her mouth, panting.

Celestia then entered the room.

"You two are free to go."

Rainbow Dash looked up, still partially dazed from the orgasm. "W-What?"

The shackles were suddenly released. Dash fell onto her back, the shit in her diaper being compressed further against her fur, making her moan lightly. Fluttershy fell forwards onto 4 hooves. Celestia left the room, leaving the door open.

"Uh... where are we cleaning up..?"

Celestia didn't answer, she just laughed. Rainbow Dash got up, looked at Fluttershy, and shrugged. She left the room, and Fluttershy followed.

Now they'd have to find some place private to clean up.

Author's Note

Picture this chapter is based on - https://derpibooru.org/1117690