Rarity: “Umm.... a diaper, darling?”

Pinkie: “Yeah, it’s really thick and crinkly.”

Everyone is silent

Pinkie: excited “Want to see?”

Rest of Mane 7: “Umm....”

Cheerilee: “This isn’t class appropriate, Pinkie.”

Pinkie gets up from her seat, showing off her diaper

Pinkie: “Can you see?”

Rainbow: “Pinkie!”

Fluttershy: blushes “Oh my...”

Pinkie turns around and bends over on her chair

Sunset and Twilight: “Stop!”

Derpy: “Hey, I’m wearing the same diaper too.”

She puts her butt to her screen

Derpy: “See?”

Applejack: “Derpy, you aren’t on screen. We also... ah don’t want to see it.”

Part two. One of the few times I've used a real-life diaper for an image.