Pinkie Pie: “Mrs.Cake I-”
Mrs.Cake: “Oh, hi dear!”
Pinkie Pie: “W-what’s going on here?”
Mrs.Cake: “Mr.Cake and I were playing a little game. He said I was being naughty so he stuck a few cupcakes into my diaper.”
Pinkie: “Okay…”
Mrs.Cake: “I never thought a full diaper would feel so good, all my cracks and openings feel so good…’
Pinkie Pie: “Uh… alright?”
Mrs.Cake: Lifts her tail
Pinkie Pie: “Good bye!” Shuts the door
I very very very much disagree with you.
Maybe, but I think she’d be a bit “put off” to see one of her employers (and honorary family) in a diaper. And considering the story in the description sees Mrs. Cake raise her tail, I think Pinkie could sense Mrs. Cake was about to do something she didn’t want to witness.