Fashionably Foalish (Private with theJozza)

[Princess Goomba]

As much as Sweetie was on board with helping her sister, being stuck in the dressing room was boring. It made her intimately aware of something though, without much to occupy herself she eventually found herself focusing on just that, herself. Which is when she began to notice a particular feeling, one that made her hind legs pull in, put a wiggle in her rear, a certain desperate feeling that her mind was about to put together when Rarity suddenly walks in, startling Sweetie out of her introspection, and causing the filly to suddenly feel a tingling up her back while the back of her diaper begins to fill.

Sweetie Belle is so stunned by this suddenly happening she barely even notices her sister checking her diaper, of which Rarity feels the diaper suddenly convulsing as Sweetie's body is quickly voiding, having been startled, the filly is filly-ing her diaper quite a bit, the heavy warmth spreading across the back of the diaper as it squishes against it. A pungent aroma quickly wafting from the garment, easily letting Rarity know Sweetie was in the middle of some 'business' of her own.

[theJozza]

Naturally, the smell of her sister's accident hits Rarity before her hoof even makes contact with the filly's padding. On the one hoof, given they'd just finished lunch and she hadn't messed since breakfast either Rarity acknowledged she had little reason to be surprised by this development. Of course on the other hoof, even after all these years the smell of a fresh mess in her sister's diaper and the flatulence that usually came with it were and likely always would be Rarity's least favorite part of caring for her sister.

"Well it's clear that somepony is in serious need of a diaper change," Rarity says with a bit of a babytalk-ish coo, although that is mostly to keep herself from gagging and potentially upsetting her sister. In any case, she soon has Sweetie Belle in her magic and gently lifts her over to the corner of the room where the changing mat is set up and gingerly lays her down to avoid squishing her mess against her.

"Now then as I was saying," Rarity says as she gathers supplies and starts to untape Sweetie's diaper, calm enough that she's able to maintain her composure as she starts wiping up the mess. "Your appearance slot is number six, which should give us plenty of time to get ready," Rarity says as she continues cleaning, clearly wanting to get Sweetie Belle as clean as possible. Honestly if she had the option she'd probably prefer giving her a bath. "Of course you'll have to model Suri's dresses at number 14, but that should give you enough time to catch your breath as it were..." Rarity says with a sigh as she gives Sweetie one final wipe and balls up the used diaper with the several wipes she'd just used to get her sister cleaned to her standards.