When Derpy eats a tasty-looking snack in the Doctor's laboratory, she doesn't realize that it contains an experimental serum—one that has an odd effect on her bust size. And that's not the only part of her that's growing...

Twilight is fed up with Spike's need to constantly pleasure himself, and sends him to Zecora to get his overgrown libido treated. Yet Zecora sees Spike's draconic lusts and size as an opportunity, and is determined to meet his—and her own—needs.

Lieutenant Penumbra of the Lunar Guard finds his captain, Echo, in a rather compromising position—with a massive flank, chest, and hips and a completely overpowering lust. It'll be up to Penumbra to pleasure her—and to get her even bigger.

A prank by a horny Twilight leaves Shining Armor with a giant and growing Princess Cadance.

Rainbow Dash takes Rarity to the gym. Unknown to her, Rarity puts on muscle mass and size a bit more quickly than most other gym-goers. Rainbow Dash is about to find this out.

To stop Twilight from worrying about her overeating, Pinkie asks Discord for a spell that will help with her diet. Discord himself is happy to help. His assistance, however, might decrease Pinkie's appetite less than it increases her curves...

Nurse Redheart has always tried to be a proper, respectful medical professional. When a heavily endowed Rarity walks into her office with a rather "milky" problem, though, Redheart finds her commitment to professionalism sorely tested.

A series of snippets, each involving a particular fetish and/or characters.

Faced with the most attractive marefriend in town, and a stallionhood that's increasingly hard to control, Soarin' is faced with a choice: let Rainbow Dash have her way with him, or risk painting the entire town white.

Celestia tends to grow into a giantess when she gets horny. Chrysalis, who plans to seduce her, doesn't know this.

When Twilight asks her to test a size-increasing artifact, a dainty Rarity finds herself adding on more than just a few inches of height to her well-endowed figure.

Lt. Silver Spear has a problem: Princess Luna's massive flank just won't leave his thoughts. No matter how hard he tries, he can't get her ass out of his head. And then Princess Celestia decides to give her own "assets" a boost...

Trixie's big breasts and great ass aren't enough to satisfy her. No; she wants to be the biggest, curviest, most sexual mare in Equestria - and a hunky, well-endowed Blueblood's unbridled lusts and deep pockets are the perfect way to get her there.

Bigger is better, and hotter to boot. But going up a few sizes doesn't just mean getting sexier. A "bigger" pony has to deal with bigger inconvenience, bigger difficulties in everyday tasks, and bigger temptations. These are their stories.