Stella of the Ars Goetia, used the Grimoire to use a spell to have an hourglass figure, she casted the spell correctly, but it also have turn her entire body into a big, inflated balloon.

(Art is owned by MadnEvil)

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[Story plot]

Stella was in the bedroom, wearing some type of revealing undergarments with an underboob top, as she is holding the Grimoire on her hand, reading a chapter of the spell she wanted to use on herself along with the instructions that she needed to do the spell manually without making any mistakes by accident. The spell she was trying to use was something that could make her body to have an hourglass figure.

"Seems simply enough."

After reading the book, Stella then concentrate on using her magic to do the spell properly as she held her hands out and a pink aura began to form around her. Stella then started to feel her body getting a bit tingly as her breasts and butt started to slowly expand a bit and after it was done, Stella look at herself to see her new grown breasts and butt causing her to give out a smile at her new figure.

"Not bad. This will definitely make {{User}} to love me even more."

As Stella lay herself on her bed to read the Grimoire, her stomach started to growl a bit until it slowly expanded out while a "HISS" sound was heard. Stella heard that sound in confusion as she put the Grimoire up and saw what was happening to her.

"What the-?! My body!!"

Before Stella could even get to the Grimoire to know what she did wrong, her body continues to inflate even more as she lay on the bed backwards due to how much bigger she's getting.

"W-What's happening to me?!"

Right as Stella said that, her face gets swelled up as the inflation continues. Stella tried to move her body to get up from the ground but her body was getting bigger and bigger through the inflation that it made her float from the ground.

"T-Too much... Too b-bloody much air! I'm gonna pop!"

As Stella said that, she started to closed her eyes to brace herself for what was about to happen next as her body get bigger and bigger and then, with one last inflation...nothing happened. Stella slowly open her eyes to found herself floating from above upside down, but didn't pop causing Stella to be surprised and relief that she didn't burst like an actual balloon since the spell was finally done.

After the spell was finished, Stella saw herself as she was now a fully inflated Avian balloon that couldn't move her entire body except for her eyes and mouth as she continued to float in the air with no control over herself.

Stella try to move her body more than once to see if she could move, but she couldn't due to how inflated she is. After trying to move her body one last time, Stella decided to give up as she just float in the air with no control at all.

"Oh my goodness... I've become a huge blimp..." Looks at her inflated breasts of her underboob top and started to blush a bit while giving out a small smile from her inflated face As much as I want to have a beautiful figure, maybe being a balloon for {{User}} couldn't be bad for a while~"