“Wanna see a neat trick that’ll totally blow your mind!?”

“KYAAAH!!!”

Trixie was walking home after school, only to be interrupt by the sudden arrival of Pinkie’s grinning face appearing mere inches away from her own. Trixie backed away, putting some distance between her and the bubbly young woman with no idea of what personal space meant.

“Didn’t anyone ever tell you not to suddenly pop out in front of people’s faces like that?” Trixie shouted.

Pinkie counted off people with her fingers. “Maud, Marble, Limestone, Mom, Dad, Twilight, Fluttershy…”

Trixie pushed Pinkie’s hands down. “Trixie gets it,” she sighed. “Witnessing this trick of yours is the fastest way to get you out of Trixie’s way. So fine, show Trixie this trick.”

Pinkie bounced up and down with an even wider grin on her face. “Oh, you’re going to love it, Trixie!” She poked her classmate’s arm. “I bet you’ll be begging me to teach you how to do it when I’m done.”

“Just hurry up and show me!”

Pinkie took a few steps back. “One… two… this should be far enough.”

Trixie raised an eyebrow. She continued watching Pinkie, puzzled, as the young woman took in as deep a breath she could. Trixie’s eyes couldn’t help but stare at the Pinkie’s pair of huge breasts that pushed out as her lungs filled with air.

“Here goes!”

Pinkie shoved her thumb into her mouth and blew as hard as she could. Trixie gasped as Pinkie’s hand inflated like a balloon. Her forearm inflated next but so did her forearm’s muscles. Trixie watched in shock as Pinkie’s arm and its muscles blew up like balloons right before her eyes.

“H-How…?” Trixie could hardly speak. The sight of Pinkie’s enormous and bulging arm, which had grown larger than both women, left her nearly speechless.

The growth moved onto her torso. Her pectoral muscles and breasts blew up in size. Pinkie’s white shirt tore apart, unable to contain her growing chest or back muscles. Pinkie’s bra dug into the soft flesh of her growing breasts, stretching as much as it could and disappearing into them.

Pinkie continued blowing into her thumb. The rest of Pinkie’s body inflated to match the size of her arm and torso. In a minute, Pinkie had transformed into a giantess that towered over Trixie, being at least five times taller than her, and had muscles even larger than that. Her bra and panties were the only articles of clothing she wore but they were stretched so much, Pinkie might as well not be wearing anything.

Pinkie’s thumb popped out of her mouth.

“Enjoyed the show?” Pinkie laughed flexing her arms. Biceps taller than Trixie rose up above Pinkie’s head.

Trixie fell onto her rear, her jaw dropped. “W-whaaa…”

Pinkie laughed while continued to flex her muscles.

“I told you my trick was going to blow your mind!”

Author's Note

A quickie based on one of my drawings where Pinkie blows into her thumb and her muscles start inflating like a toon. I like uneven growth.