It's a late afternoon in the city of Canterlot. Sunset Shimmer is in her room reading the 4th volume of The Trials of Clover the Clever. She rolls over in bed and takes off her socks before continuing the story. Meanwhile reading, Sci-Twi comes through her apartment door; sobbing and hyperventilating hysterically.
Sunset got up immediately after putting her book down, "Twi! What happened?! Are you alright?"
"I got fired from my job", she bites back her lip and holds back her tears, "I messed up so bad. I accidentally put people's personal information at risk in the banking system because I was tired and out of it. So much for trying to get a new job!"
Twilight continues to weep into her dainty hands. Sunset comes up to her and rubs her back, but then that's when she gets an idea. She comes behind Twilight and wraps her arms around her waist.
"Is someone feeling a little baby? Hm? Do you need mommy to tuck you in?"
Twilight's eyes widen at Sunset's words, "I know what you're trying to do Sunset, I just don't feel like regressing right now"
"Come on baby... I'll even get your stuffed animal, Smarty Pants...", Sunset smirks as Twilight's eyes light up.
"S-smarty pawnts?"
Twilight's voice becomes smaller as she claps her hands and smiles as Sunset picks her up like a true caregiver.
"Mhm, yes baby, and we will get you your bottle, your binky, and your dog onesie!", Sunset asks her another question, "Do you want your diaper too?"
Twilight shakes her head, "No! I feel big todway!"
She grabs her stuffed animal before being scooped up again by Sunset.
"Who is a good girl? You are!", Sunset nuzzles Twilight's nose and gets her changed into her pajamas. She carefully makes sure that Twilight is snug and comfortable before letting her on her back to continue a piggyback ride.
Once Twilight is dressed, she is placed in her little space playroom. Inside there's a pink princess tent, a toy bin, a crib with a mobile, and a fluffy lilac-color blanket covering the floor. Sunset carefully sets Twi down and rubs her head.
"Remember our rules, baby? Restate them for mommy so she can make sure you know them."
Twilight sits and thinks for a moment, "No ruwnning, no throwing things or hit mommy, and cleawn messes!"
"Good girl! Now what do you want to play with first, baby?"
Twilight crawls over to her toy chest and pulls out her big shark plushie. She nibbles on its dorsal fin until Sunset gently pries it out of her tiny grasp.
"No baby, we don't chew on stuffed animals. I have your pacifier if you want it."
"B-but-"
Sunset takes one of her moon-themed pacis and gently places it in Twilight's mouth. Twilight instinctively latches onto the nipple of the pacifier and begins to suck on it to sooth her fixations.
A little later passed by and the sun begins to set. Sunset always makes sure Twilight takes her medication. Though today Twilight has been very... fussy. She sees Twi get up and start crying and whining.
"Baby- it's just your regular medicine. I know you don't like syringes, but it's to help to suppress your immune system disorder"
Twilight whimpers and shuts her eyes, kicking and screaming every time that Sunset tries to come near her with the needle in hand.
"Baby, you need your Lupus medication... please stay still for mommy..."
Twilight pouts and stays still as Sunset gets her shark plushie for her. She looks at it and hugs it all while staying still so that Sunset can prepare her injection via arm. Twilight's nose scrunches up to the smell of isopropyl alcohol; even if she is a medical student the smell is unbearable for her.

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Little Stars, and Big Emotions (Agere Sci-Twi and Caregiver Sunset)
FanficThis fanfic is strictly NON-NSFW, this is NOT ag*pl*y. Please get off my account if you support that. This is for age regression which is a coping mechanism🎀🧸 All characters belong to Hasbro and DHX media.‼️