Art courtesy of eos9! (https://www.furaffinity.net/user/eos9/)

Amethyst colored eyes gone wide, Celia's ears splayed against her head. A rip, loud and prolonged, gave the Eeveelution cause for concern. With great trepidation she tucked her soft chin against a broad soft shoulder. "Eep!" Those purple furred cheeks of hers grew hot at the sight and accompanying sensations. Rolls of furred flesh piled on top of one another as the Espeon's all but exposed butt cheeks overflowed her heaving hips. Legs chafing together, her every errant movement sent ripples of chub coursing across her rump. Celia's wavering twin tails flit up almost as if to recoil and retreat from the growing gravity of her titanic toosh.

"Huh. I never knew they made denim undies!" Radda bleated out bashfully as he eyed up the tiny blue gap of fabric lodged between his gal pal's glutes.

"...They don't," she shyly replied.