"Weight Gain Spell" it read. This spell was apparently used to make someone 'bigger'. Now, most girls would have gotten as far away from this thought as possible, probably go on an all....something diet just for thinking about tit.
Gwen however, was not one of those girls.
She thought she was though.

"This is too weird, who'd want to get fat?" Gwen said aloud. However, no matter how much she denied it, she couldn't stop thinking about it. Her logical mind had already pointed out some benefits. For quite some time now she had been wanting a bust line. Sure, Gwen was just starting puberty, but that didn't mean she wanted to wait for results.
Gwen also wanted a bigger rear. She had dreamed about attracting men with her larger ass, instead of the flat buns she was currently stuck with.
Speaking of which, Gwen recalled an ocassion where she had first pondered the possibility.

It was still the early days of Ben 10. Her cousin had more or less, mastered his alien forms, but criminals still sometimes caught him off guard.
"They got away?" Grandpa Max asked coming up to his shape shifting grandson.
"It would of worked if Gwen hadn't but in with her big butt!" Ben remarked. Sure, Gwen had a counter for that remark, but that was when she first realized she lked the sound of that.

Another factor that started to play in was her sweet tooth. Sure she liked sweets just as much as any other kid, not as much as Ben, at least, that's what it looked like. When no one was looking, say at a convenient store, she would stuff a few candy bars into her pockets. Later at night, while everyone's asleep, Gwen would reach into her secret stash, and chomp down the bars in huge bites, smearing chocolate all over her face, which she promptly licked off. Being in an RV where the daily special is Possum or some other woodland critter, only increased her appeteit.
Being young had granted Gwen the metabolism to not become fat, but now....

The Rust Bucket suddenly shook. Gwen got to her feet, and looked out the window.
"Time to rock and roll!" Canon Bolt said as he curled up into a ball. A bunch a punks with guns around him never saw it coming, as he sped towards them.
After using them as bowling pins, two still standing actually charged at Ben. He just yawned and waited.
Finally, when they did impact, he used his huge body to bounce them back.

After dispatching them, Ben spotted his cousin watching "Enjoying the show?".
Gwen smiled, and shut the window.
After she disappeared, Ben scratched his hhead "Weird, even for Gwen.".