A Restroom Recipe

“Are you sure about this?” Pinkie asked, glancing over to the supine Princess.

“Quite sure, yes,” Celestia insisted, easing a pillow under her head.

Pinkie shrugged, unwilling to turn down the bizarre request. Having devoured the ingredients they’d purloined from the royal pantry, she recited the mystical words and did the requisite dance. Sure enough, after a scant few seconds passed, a familiar rumble in her stomach caused her to wince.

With all the haste she could muster, taking care to clench her backdoor as hard as she could, she scampered over to the reclined alicorn and got into position. It felt pretty darn weird enacting the ritual a second time, knowing what would happen, but that wasn’t nearly as strange as what the Princess had in mind. Lowering her head, peering down her belly, she cautiously backed up and straddled Celestia’s head.

“I h...hope you’re ready for - Eeeep!” Pinkie’s warning was cut woefully short, as what could only be a tongue dug into her backdoor.

The surprise of the unexpected intrusion, paired with the overwhelming urge to relieve herself, was her undoing. Her eyes rolled, as a torrent of batter flooded from her ass and into the awaiting Princess’ maw. Unlike the first time, when she’d unleashed her waste in a somewhat controlled manner, the surprise of it all made the bowel movement practically explosive.

Though she couldn’t see it, the steaming, chocolatey paste absolutely covered Celestia’s face, yet she wasn’t bothered in the slightest - if anything, she appeared overjoyed with the immense output. Like a foal in a candy shop, she ravenously chugged and gulped down mouthful after mouthful. As she closed her eyes, practically burying her face in the plush, pink posterior, her horn went alight.

With a sorcerous tug, the Princess wrenched the earth pony lower. The move was swift and merciless, once again catching the baker by surprise, yet even she couldn’t have predicted what Celestia had in store for her. Forcing her head upward, using a combination of her natural and magical strength, the alicorn crammed her snout into the smaller mare’s rear.

Only the occasional stifled gag or muted cough escaped the Princess, as she effectively chugged what had to be pints of batter. Try as she might, Pinkie couldn’t comprehend how Celestia was able to hold her breath, being muzzled by her tush, but it ultimately didn’t matter. After a minute or two passed, having apparently sated, the alicorn withdrew.

“Absolutely delicious,” Celestia reverently intoned, licking the cloying, unbaked cake mix from her lips. “You don’t have any more in there, do you?”

“Uh,” Pinkie dumbfoundedly grunted, taken off guard by the question.

The impromptu feast had been so jarring that she failed to realize she’d been nearly emptied. Straining, squeezing as hard as she could, she quite literally farted out the final dregs of her contents onto the Princess’ once-regal countenance. With her bowels well and thoroughly voided, having coated the alicorn from the neck up in sticky goodness, if it could be called such, she straightened up and turned around.

“So - um - you need any help with…” she fell silent, seeing the diarch wipe and crack one eye open.

“That will be all, Pinkie,” Celestia serenity noted, waving a forehoof. “Although if I may make one small request, do see if you can find a similar custard recipe…”