Twilight was quite confused with her predicament, how could she be here looking like a baby alicorn? Was Celestia her mom now? And if that's the case, was this the same timeline that had been messed up, or had she jumped into another universe entirely?
The little filly ly there in her crib, watching Celestia still in a deep sleep. She tried to talk to her, but found that only baby babble came out, and her tiny voice wasn't loud enough to wake up the princess. She grumbled irritably, kicking about in her soggy diaper while getting quite angry. "Ugh! How did I end up wike tis?! Tis wasn’t supposed ta happen!"
The little filly laid back into her crib and sighed, looking up at the spinning mobile with plastic suns. She grumbled, looking over her pudgy body while she babbled to herself. "How's it even possibwe tat I got sent to a diffewent timewine? Cewestia's speww must've messed up somehow. Or somepony ewse messed it fow hew."
The filly then heard a faint whimper and turned to see another filly next to her; it was a little white-coated filly as well, but she had a striped pink and orange mane. Twilight was surprised, nudged the little foal next to her and whispered. "Hey, who awe you?"
The little filly slowly woke up, looking surprised as she exclaimed. "What is goin' on hewe?! Where am I?!" Twilight eyed the foal who seemed quite familiar. All the while, the little filly looked down at her soggy diaper, poking the padding and making it squelch between her legs as she whined. "Nah! Why am I stiww a foaw?!" She then turned to face Twilight and snapped. "Who awe ya?!"
Twilight gulped as she realized that her enemy hadn't recognized her. She pondered on what to say, seeing that she had to tell this filly a name that wouldn't ruin the timeline. For some reason, the name Sunspot came to mind, and she babbled back. "I...um...my name is Sunspot…"
Starlight held out a chubby hoof and babbled. "My name is Sunlight…" Then she blinked, looking quite confused for a second before she babbled, "Sunlight...nah, my name, not Sunlight...why I keep saying Sunlight…"
Twilight eyed the filly; then it suddenly dawned on her that this other filly was actually Starlight Glimmer. She pondered if she should tell foe that she was Twilight, or at least also an adult who’d gotten turned into a foal. The filly decided maybe it was best to pretend to be an actual baby for now and babbled. "So...um...Sunlight...uh...who awe ya?"
Starlight turned to face the filly and pointed at herself. "I was a big pony who went back in time to twy and hewp a fiwwy. I went to a filly's nursery twying to...um...save hew with some medicine."
Twilight rolled her eyes at the lie but let Starlight continue. "Bu befowe I couwd give hew ta potion, a magical light exploded. Guess some speww hit me and now I'm hewe. I guess I'm in a altewnate timewine or someting."
The young alicorn stuck her hoof in her mouth as she thought things over. Celestia's spell to "repair the timeline" must have sent her and Starlight here somehow. She would bet that the two Dr. Whooves were also here along with the other Derpy.
Starlight had calmed down as she plopped on her soggy padding and asked, "So Sunspot...guess ya actuawy Pwincess Tia's foaw ten?"
Twilight snickered, seeing that Starlight still hasn't recognized her, and continued. "Yep, I actuawwy Pwincess Tia's baby...but...um...my mommy is stiww sweeping as ya see. So we gots to wait until she wakes up, then she can change ya diapee."
"Ugh, ya a baby ow not?! Just cwy and wake hew up. Ya need a diapee change too." Starlight Glimmer whined out loud.
Twilight squeaked as she realized that her diaper was also quite soaked. "Ya wight...um...b.." Then the filly gulped as she began to whimper and tear up. For some reason she felt like crying, and it wasn't long until she was balling her eyes out.
Twilight’s crying eventually did wake up Princess Celestia. She gave her foals a tired smile and walked over. "Oh, my darlings are awake and need diaper changes I see. Sorry, I must’ve slept in again." She picked the two fillies up in her magical embrace, then placed them down on the changing table nearby. She made quick work of wiping them down with fresh foal wipes and giving their rumps a thorough fresh powdering.
Celestia then went about strapping them both in new diapers. And as the princess did so, Starlight started to babble. "Tia wisten, I not ya fiwwy! I fwom ta futuwe! Ya gotta send me back!"
"Aww, is my little Sunlight playing a game?" Celestia giggled as she tickled the foal's belly with her wing making the foal kick and giggle, her diapers crinkle and powder poof from the leg holes.
"But I weawwy fwom ta futuwe! I am! I am!" The filly whined and kicked her chubby hooves about.
The princess, however, ignored her foal's tantrum. The princess of the sun then placed the two fillies into a playpen. "Now you two play and have fun while Mommy goes and raises the sun, okay? This won’t take long." Celestia then walked off as the two fillies sat in the playpen.
Twilight sighed as she stacked blocks, pondering the situation and wondering what she should do. The filly turned her head, watching Starlight getting quite fussy and pouty as she kept trying to light her horn to perform her time spell. She knew that this filly would make sure she stayed a foal forever, but Starlight was quite adorable for the other alicorn filly; it was almost impossible to see her as a villain.
Twilight waddled over as she was now intrigued and babbled. "So um, what ya doin?"
Starlight hmphed, plopped down on her padded rump and grumbled. "I twying to get back to my own timewine."
Twilight smirked, deciding to mess with her enemy a little to teach her a lesson, and babbled. "But it wooks like my mama tinks ya my sissy."
"Tats siwwy! I wowud know if she my mommy!" The little filly shouted, seeming to get more frustrated with her situation. “I had a mommy in my own timewine, and she wasn’t the pwincess!”
Twilight shrugged and continued. "Who knows what happened? Maybe ya showed get used to being in diapees now."
"Ugh, no way, diapees aw the wost! I'm gonna get back to ta futuwe! But my spew isn't wowking!" Starlight shouted as she tried lighting her horn, but only sparks sputtered out.
Twilight continued to snicker. "But ya a baby now, ya can't do compwicated spewws."
"Nah uh! I actuawwy a big pony tat was tuwned into a baby." Starlight snapped with a cute pout on her face.
Twilight couldn't help but roll around, kicking her hooves laughing as Starlight started to get angry and shouted. "Sewiouswy, stop tat! Ya just making me mowe angwy!"
The other alicorn filly got up and babbled."Wook, ya a foaw in ya diapees wight now so...how ya gonna get back to ta futuwe, huh?"
Starlight tapped a hoof to her chin. "Maybe...if I twain my magic. I know ta spew, but I can't do it until I twain whiwe in tis baby fowm."
Twilight sighed in relief at the knowledge Starlight had a way for them to get back to their original timeline. And when Starlight performed the spell, she would stay next to the filly so she could get back as well. With any luck she’d be able to stop Starlight from changing the timeline again.
Twilight then continued to explain. "Wook, we baby awicowns, so we gots woad of stowed up magic. Ya can pewfowm bout any spew if ya weawwy want to. But tat awso means ya gots to be cawefuw ow ya might do sometin cwazy."
"Ya obviouswy an actuawwy baby awicown so...umm...can ya be my teachew?" Starlight asked with a growing blush on her face.
Twilight honestly didn't feel like she could trust this filly, but considering the circumstances they were in, she felt as if she didn't have a choice. There didn’t seem to be any other way of getting the timeline back to normal. "Fine, I'ww teach ya how to use magic as a foaw, but ya gots to do evewyting I say."
"Fine, but dun make me do anything embewassin, pwease." Starlight grumbled, and Twilight then began to teach her "sister" how to use magic by lifting toys and blocks around them.
After an hour of Twilight assisting Starlight in using her magic by flapping her wings and lifting blocks and other toys in the playpen, Celestia came back with a smile on her face as she lifted the two foals with her magic and nuzzled them. "Oh, you two are trying to do some magic? That's so adorable. My little fillies are already trying to be like Mommy. But we should hold off, you’re not even potty trained yet."
Starlight kicked and whined in her pampers again, only making herself look more adorable. While Twilight, on the other hoof now had her face turning a deep red as she loved this attention from her mentor.
However, the fillies began to kick and squeal as their "mother" tickled them with a wing then placed the two onto her back.
Luna then came over with a smile on her face and dawwed. "Morning, sister, how are you and the little ones?"
"Oh, we're fine this lovely morning, Luna. But it seems like Sunlight is a little bit cranky." Celestia chirped as she let Luna lift her daughter in her magic, making Starlight kick and babble.
Luna then set and nuzzled the foals as well before commenting. "Oh, Sunlight looks cute even when she's a little cranky butt. She really takes after you, doesn’t she?"
"Yes she does, I suspect she’ll be ready for magic kindergarten even before she’s out of diapers,” Celestia cooed and then asked. “I’ve got to get these two fed. Want to help me make their breakfast?"
Luna smiled with delight. "Of course I would, sister. You know how much I love little ones."
The two trotted off together to the kitchen where Celestia took the foals off her back and strapped them into highchairs.
Twilight blushed as she was now starting to get used to this routine with a bib tied around her neck.
Starlight, however, was more angry, kicking and whining as a bib was strapped around her neck as well.
Twilight sighed and whispered. "Hey Sunlight, stop fighting or ya gonna make tings wowse, and ya powbabwy gonna get put in timeout too."
"Ugh, fine."' Starlight grumbled as Celestia then went about and started to spoon-fed the two some oatmeal.
"Open wide!" The princess of the sun cooed as she slid the rubber spoon in her foals’ mouths.
Twilight happily munched away, having gotten used to this now while Starlight was getting used to her chubby mouth with the foal food getting all over her mouth and tray.
Then Luna took two bottles of milk. "Enjoy. I made sure I eat quite healthy, unlike your mother."
Celestia rolled her eyes and gave a sarcastic "Haha. good one, Luna" at the comment.
The princess of the night did not reply as she placed the bottles into the foals’ mouths. Twilight squeaked as the rush of the creamy milk went down her throat and even Starlight was quite calm, chugging down hers.
After their mouths were wiped, Celestia turned to one of her maids. "Ah, Manny Timetable, I'm so happy to see you. And just in time too, the foals have just had their breakfast."
Twilight turned and gasped, seeing a female Dr. Whooves in a maid uniform give a curtsey. "Of course, I know their schedule better than anypony else in this castle." She then picked the two up and placed them on her back.
Twilight wanted desperately to communicate with the mare, but she couldn't risk blowing her cover to Starlight, so she waited as they were taken to a playroom. The two alicorn fillies were amazed at how big the room was, full of toys and plushies scattered all about.
The maid plopped the fillies on the ground and cooed, "Alright, you two have some fun. I'm going to tidy up this place a bit." The mare then went about picking up toys and placing them in a giant toy chest in the back of the room.
"Tats it, I gotta pewfowm ta spew and get out of hewe! I sick of being babied!" Starlight shouted as she squinted her eyes and lit her horn, but nothing happened aside from her messing her diaper! She squeaked as the maid then lifted her and changed her diaper like it was no big deal.
Furious and humiliated, the angry baby alicorn kicked and whined as she was placed back down next to Twilight, and snapped. "Sewiouswy?! My magic doesn’t wowk! What awe we gonna do! I can't stay hewe fowevew! I dun wanna be a baby again!"
Twilight gulped as she sweated, getting a bit nervous. But it slowly dawned on her on why Starlight's spell failed. "Um...if ta spew is meant fow ya to go fowawd in time...and ya in a diffewent timewine, tat means it pwoabwy not gonna wowk. We need a speww tat can get us back in owa timewine whewe Tia doesn't have foals."
Starlight groaned, rubbing a hoof over her face, and whined. "How do we find a spew wike tat?"
Twilight shook her head. She knew her best option was trying to talk to "Mrs.Timetable" alone to see how she got here as well. "I dun know, I tinking of a pwan but it couwd take sometime. But fow now, ya best get used to being in diapees.
Starlight placed her hooves on her face and cried out. "Nooo!"
“Weww, ya not weady fow potty twaining!” Twilight teased.
“Ya-huh, I can pwove it!” Starlight boasted! “That accident was because I messed up my speww. I can totawwy use ta potty,” Then she blushed. “But… I might need ya hewp getting thewe since ya know where ta potty wooms awe in the castwe.”
“Weww, we’d need a distwaction fwist,” Twilight pointed out. “And uh… I onwy know Mommy has one in hew bedroom. Thewe too many hawways in the castwe.”
“Weww, ya weave the distwaction to me, I know how to use magic now!” Starlight boasted again. “Just give me time to tink of someting.”