_This was unexpected._

Celestia blushed heavily, her lips suckling the nipple of her cute sun-themed pacifier as she found herself bowing in the presence of this… this… upstart pony who strolled into her castle and stripped away her marehood with strange and powerful magic unlike anything seen in Equestria.

“Is my cute little princess all nice and comfy now?” The red-skinned alicorn cooed with a slight sneer in her tone, flapping her demonic wings reflexively. “Normally babies are so easy to bring down from their ‘delusional’ thoughts being grown-ups. But not you, Celly-Poo.”

The princess winced at the humiliating nickname this creature deemed her; she was terribly unfortunate that her sister was nowhere to be found nor could she call upon her student for her aid. Celestia was at the mercliess hooves of this mad motherly mare.

“Instead… you’re so powerful, I couldn’t do it the old fashioned way.” Mother Maiden explained as her horn started to glow dark red, affecting the “Baby Ring” that she slipped onto Celestia’s horn. While she couldn’t brainwash her into babyhood like her other infants, Mother Maiden did have a backup plan: a ring that with charged enough energy could force anyone into doing babyish habits against their will.

Celestia felt her lips suckling harder on her paci (the motion itself wasn’t too bad, something the princess would never wish to admit) as she felt something shift within her bowels. She grunted lightly, her face turning red as though she was pushing some—

No…

Wait!

*BBBRRRRRTTTT*

The princess almost dropped her pacifier in sheer horror at what she was doing…or rather, what she didn’t even feel like she was doing. Her thick diaper felt much more heavier from her smelly load that filled the air. Celestia fought back tears from the sheer embarrassment of defecating like some little foal while Mother Maiden chuckled lightly at her suffering.

“In time, you’ll enjoy making poopies for me.” The demon alicorn grinned, summoning a massive changing table that was perfectly sized for someone of Celestia’s size and even had a cutesy mobile attached to it. “Now… let’s get you all cleaned up, Celly-Poo!”

Celestia nearly snarled at her captor, only for bubbling drool to drip from behind the shield of her pacifier. She could only hope someone would help her escape from this crazed pony’s twisted amusements.

PONIES. Because apparently everyone really wanted Princess Celestia to be padded up at the adorable yet embarrassing mercy of Mother Maiden. I considered on having Celestia actually BE mentally regressed but, for some reason, I think it’s far more amusing for her to be embarrassed and aware. <3 Anywho, I hope you enjoy!