Hey! This is the first fan fiction I have written and uploaded so any and all reviews, especially the ones pointing out mistakes (since this story lacks a beta), are more than welcome.
I'm not quite sure where I'm going with this story, but it takes place a few days after the de-aging episode, but here Ben and Rook didn't manage to bring themselves back to normal, which left it up to Bluik and Driba to fix it. A recipe for disaster, I know.
As for trigger warnings, the only one that will be present throughout the story will be body dysphoria. Other trigger warnings will be added as the story progresses.

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Ben stood impatiently as Bluik and Driba worked loudly on the machine, his face containing a look too sour for its young age.
He tapped his foot lightly on the concrete floor, arms crossed, eyeing the two grey aliens as they fought for who got to assemble the last piece.
"Today would be great." Ben gritted out, his high pitched voice leaving an imaginary, yet still uncomfortable, buzzing in his ears.
"We're almost done revving it up!" squeaked Driba, shoving his hand towards Bluik's face as he made an attempt to fit the piece in its rightful place.
A shove and a grunt later, both aliens were down, rolling and yelling, the piece left on the floor, forgotten.
Rook sighed loudly behind Ben, making his presence known to the other boy.
"Didn't see you there buddy, you practicing your sneak attack skills or something?" Ben said as he turned his attention to Rook.
"Hardly." Rook said as he stepped forward "I came here to check on the progress of the de-de-aging machine, and it would seem there has been none."
"There is literally one piece left for it to be up and running, but they've been too busy fighting over who gets to assemble it to, y'know, actually assemble it!" Ben said as he waved at the spectacle in front of them.
"That is something that is easily resolved, is it not?" Rook said, lifting an eyebrow at Ben as he took hold of the piece in question.
Ben grinned and discreetly stepped back (you could never be too cautious around Bluik and Driba's contraptions), watching as Rook silently slid the piece in its slot.
Immediately the machine started rumbling and the sounds coming from the two grey aliens' fight ceased.
"Dang it Driba! If you would've let me finish building the machine-" Bluik started.
"Are you guys going to turn me back or what?" Ben interrupted, his frustration loud and clear.
The last couple of days had been absolutely horrid, so saying Ben was in a mood was severely downplaying it.
This whole situation irritated him to no end.
Most people wouldn't dislike being stuck as their 10 year old self as much as Ben did. Most people would think he was being silly, or that he was over-reacting.
Ben didn't really care what those people thought, he just wanted to get his older body back as soon as possible.
His current body brought back too many memories of how things, mainly Ben himself, were before he...
Before.
He didn't like those memories, and he didn't like this body. He wanted to get rid of it quickly. To get his 16 year old body back.
So, as soon as Rook stepped back, Ben stepped into the machine's platform an let Bluik and Driba plug him in.
He was excited, to say the least. He didn't even notice grandpa Max entering the room, right before a bright light took his eyesight from him for a couple of seconds. He blinked a few times and stood up. He felt taller. From the corner of his eye he could see his reflection in the small bathroom mirror that was hung on the wall. He turned to it grinning.
"Long time no see." he said, winking at his reflection.
The sound of his regular voice made him grin wider.
He had missed this.
He stepped out of the machine and leaned on the table next to grandpa. He gave him a curt nod and got a smile in return and, unable to help himself, he quickly smiled back.
"Your turn little guy." Ben said, pointing at Rook, who swatted at his tail a couple of times before answering.
"I am 2 year your senior, Ben." came the dry reply, to which Ben simply shrugged.
Ben smiled again, still feeling giddy, as he watched Rook step on the platform, Bluik and Driba repeating the process of plugging him in.
As soon as Rook was de-de-aged, everything would get back to normal and they'd go back to plumber business in no time.
Ben is pretty sure that single thought was what jinxed it.

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Sorry this one is so short, I just wanted to get this part over and done with as quickly as possible. Next chapter will be longer!