A few hours later, Twilight and her new child were inside a guest room for only this night.
Currently, Twilight had decided to freshen up from her latest adventure before the party with a quick bath while Cadance kept an eye on little Sunsetty.
Cadance giggled as Sunset tried to walk to her. She held her hooves out, "Come on, sweetie. Auntie Cadance is here to catch you."
Sunset failed at moving after four steps, to trip painlessly into her aunt's hooves. Cadance embraced the foal, pleased to hear little squeals of delight from the baby. All of a sudden, she felt a painful tug on her hair, "Ow!"
Setting the child on the ground...after gently pulling her off the mane, Cadance said to her with a tad bit authority, "No, no, cutie. My hair isn't a playtoy, okay?"
Sunset apparently understood, starting to cry. Cadance felt guilty for causing the sobs, putting Sunset on her shoulder to pat the foal into calmness.
...
"Ow!"
Cadance held the foal to her eyes, irritated now, "Okay, I'm not having a lot of fun with the pranks you're pulling, child. Those tears were fake, huh?!"
Sunset gave a flash of an evil grin.
Cadance was seriously surprised, "What in the hay?! Hey, you are still all there in the mind, aren't you?!"
Sunset tilted her head to showcase confusion. Afterwards, her own hoof found its way into her mouth, being sucked on by a seemingly-innocent face.
Cadance raised an eyebrow, "Really? As if I would fall for that trick, missy. Well, I guess it's fine."
She cooed at the little one before saying more, "I mean, what could you possibly do now, hhmmm? Stuck in that small helpless baby body, completely dependent on your very own enemies for everything! Too bad that Twilight's your new mommy, I bet! No crown for you, sweetheart. How's about a new diaper, instead?! Seeing as how you've just went in your current one."
Sunset had began to grit her teeth with every backhoof to her own ego...
Then, she heard the last few sentences of Cadance's mockery, and glanced down at the diaper hanging from herself, thoroughly soiled. She, for real this time, couldn't keep the tears from flowing down her face.
Cadance felt a bit of regret for making fun of the tiny villian...then remembered this was still a evil pony on the inside.
She poked the diaper, "Whoa! Somepony's really soaked their dia-dee! But, I shouldn't change you until you've got a full load. No point in wasting a perfectly good diaper!"
Sunset whimpered, from the urine cooling and her own fear of the mare holding her. She didn't want to go potty anymore than she already had, so held her hooves out. Sunset hoped Cadance was stupid enough to fall for the adorable eyes she was utilizing to get her way.
Sunset was now resting on the shoulder of the expert babysitter, smiling out of sight at how easily the adult could be fooled.
Cadance patted the foal's diaper, saying sweetly, "I'm waiting, Sunset. No diaper change until it's ab-sol-utely necessary."
Sunset would've told the mare, if she could still talk, to go buck herself. With a swallowing of pride, she began to grunt with effort.
When nothing was accomplished, she turned to cry deeply on the mare's shoulder, hating the disgusting wetness of the diaper, along with Cadance.
After her river of pony-made droplets all departed, she sighed, trying it out again.
This time, she could feel the lumps of crap land silently, expanding the diaper out noticeably.
Cadance cruelly pressed on the back of the full diaper, just to upset Sunset, "You do need a change, huh?!"
Sunset held her dams of eye water back, not giving the bitch the satisfaction. She would so make this particular Alicorn pay for such horrible embarrassment...whenever she regained her former adult body.
Cadance finally decided to walk over to the changing table, laying the child down softly onto it.
She got out all the supplies, and got to work.
Undoing the tapes, she then grabbed the foal's back hooves in her magic grasp, lifting them up with care. Then, teleported the diaper into a nearby trashcan. Next, wiped the messes off the foal, saying all the while, "Who's a messy foal?! Sunset is! Yes she is! I'll need to tell your mommy about how you just lo-ve to stay in a dirty diaper! Does wittle Sunsetty wike that?! If not, who cares?!"
Oh, how Sunset hated Cadance for what she was planning on saying!
After her area was clean, a brand-new, clean diaper was introduced to the foal's bum swiftly.
Within minutes next, Sunset was on the carpet, just in a glaring contest with her new aunt, even if the adult had just changed her diaper.
Twilight got out of the tub, toweled off, and went into the room all sparkly clean for the party.
She saw her sister-in-law shake a rattle in her new child's face, laughing while she did it. Cadance said to Twilight as she shook the baby's toy in front of the most annoyed foal right now, "She is just a little cranky from not enough sleep. We should get her to bed now. As in right now! I must speak with you about something."