Omniverse! Ben 10 x reader

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This was requested by Wingstar, I went to the depths of the internet to get this treasured fanart and now I need holy eye drops to erase the things that should remain unseen. Anyway, onto the oneshot!

Dear (Y/N),

Many things have happened lately I do not know where to start. This letter will be shorter than the others because I will see you really soon thanks to the cadet program the Plumbers have. Ben has no interest so I applied you for our team. Everything has been normal, as normal as it could be for a Plumber. Even though you have graduated with top marks at the Academy, I hope you are still staying out of trouble. Max has told me you are one of the brightest students and I hope you keep it that way.

Sincerely Your Cousin,

Rook

You read the letter as you did pull ups with your tail. You were a half human and Revonnahgander hybrid, therefore you still had your tail. Your skin was also a corresponding pigment to the typical markings of a Rev. Once you finished your last tail pull up you flipped over and put the letter with the rest of Rook's letters. You already got the notification that you were joining Rook and the infamous Ben 10 as you learned the ropes of being a Plumber. You stayed on Earth for most of your life but you also visited Revonnah from time to time. So you honestly didn't know what to make of Ben 10, if anything you looked up to him a little, just less than most of your cousins who are pretty much obsessed with him. Most of your stuff has already been moved to your house, except for some key pieces of luggage you were going to move today when you went back to your home. You ran a hand through your hair. It'll be ok, Rook'll be with me, I won't screw up you thought.

-Timeskip-

Ben looked around at the different Plumber agents with fresh faces and groaned.
"Ugh, it's this time of year again"

"What time of year is that?" Rook asks.
"Plumber Academy Rookie time" Ben sighs.
"I do not believe it is called that"
"It should be, Plumbers who graduate join groups for a few months for 'experience'. It's so stupid, they're just a bunch of rookies who join up with the more experienced individuals who have the more important jobs only for the rookies to screw it up during the extra important missions and then I've gotta come in and clean up their mess" Ben complains.
"Are you sure you are not blowing things out of proportion?" Rook asks.

"No way, good thing I've never filled out the applications to get our own rookie, could you imagine it? Last thing I need is a fresh faced rookie with a stick up their- hey Grandpa Max" Ben greets.

"Hey Ben, I have to say I was surprised you submitted an application this year for our Plumber Academy Field Introductory Program."
"Wait I didn't- I never- wait a second, did you fill out an application?" Ben turns to Rook.
"Well..."
"Rook!" After looking through the giant crowds you finally spotted your favorite cousin and glomped him in a hug. He stumbled back slightly, and realizing it's you, hugged back.

"I missed you" you tell him.

"Yes, I missed you as well, (Y/N). It is good to see you again." Your tail flicked back and forth happily.

"Wait- since when has Rook had a girlfriend?!" Ben asks, astonished.

"Oh your Ben 10, I must say for one of the best Plumbers here you really aren't that observant. I'm Rooks cousin, my name is (Y/N), I can't wait to work with you." You offered your hand and he shook it.
"You? Rook's cousin? But you look so...."
"Human?" You ask him, your tail swaying back and forth.
"...Yeah..?" Ben shrugs in a high pitched voice, trying not to get you upset.
"I'm half Revonnahgander, I get the tail and skin pigmentation from my Dad's side of the family." You answer with a shrug.

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