A/N: Hi, this is the first ever Ben X Fem Ben (Lynn) story ever! I hope you'll enjoy it! Possible harem if ever continued. Lynn's name and design was inspired by a drawing by artist Jay Marvel of Deviantart and other Fem Ben art. (You should check it out if you like busty girls and badass designs)

Ben X Lynn One shot

Chapter 1: Not in (my) Kansas anymore

We come upon the small town of Bellwood, it was just an ordinary day and nothing strange happening. We come upon a place known as Mr. Smoothies, it was one of the most popular places in this town, and we come to see a certain customer that was well known around here, Ben Tennyson, a young man who wielded the powerful device called the Omnimatrix (Known as Omnitrix for short), the young hero had just bought a chocolate and carrot smoothie.

"Nothing like a smoothie to take away the boredom." Ben said as he took a sip of the smoothie until a voice came behind him.

"And it will be your last." The person said as he tried to attack Ben, who got out of the way just in time. He turned to see none other then...

"Eon!" Ben yelled as he got ready to fight, "Came to get your butt whopped again?"

"On the contrary, Tennyson!" Eon yelled as he used his laser blades to attack Ben who dodged the attacks. "You are going to die!"

"Sorry, not happening!" Ben yelled as he activated the Omnitrix and transformed into Four Arms.

"Come at me!" Ben/Four Arms yelled as he came at him, but Eon vanished.

"Got you where I want you!" Eon said as a portal appeared in front of Ben.

"What the hell!" Ben/Four Arms yelled as it was sucking him in.

"I will finally get rid of you once and for all!" Eon said with a crazed grin on his face. Ben glared at the rouge time walker. Ben was losing his grip and finally lost.

"Aw maaan!" Ben yelled as he was sucked into the portal and it closed. Ben was finally gone.

For now anyway...

(Unknown location)

Ben was out cold until he finally opened his eyes, everything was blurry at first, but he soon got his vision back to its original state. Ben then got up and looked to see that he was in an ally way or something.

"My head..." Ben said as he rubbed his head in pain. Ben looked around to see that he was fine and confused by what happened.

"That's strange." Ben said out loud. "Should I be dead or something?"

That's when he walked out of the ally to see that he was in Washington D.C.

"What the heck? Why am I here?" Ben said shocked. But then he looked to see a crowed of people running for their lives.

"I will finally have what's mine!" A voice yelled.

'Why dose that sound familiar?' Ben thought confused by what was going on. Then he looked to see a giant mutant bird creature. Ben knew who it was now.

"Animo?" Ben said with a raised brow, but when the mutant bird landed he was surprised by what he saw. It was a middle aged woman, she had sickly green skin, long white hair, and she had a crazy look in her eyes.

"I Dr. Animo will have what belongs to me!" The woman yelled. Ben was confused.

"I really need to lay off the chocolate and carrot smoothies..." Ben said to himself. That's when he heard something all too familiar. He looked to see a RV. It was the Rustbucket, but suddenly three people came out of the RV which shocked the young hero.

The first was an elderly woman. She had long white hair, and had on a Hawaiian shirt that showed off her cleavage and white jeans.

The second was a young man that looked about 16 or 15 years old. He had short orange hair, green eyes and wore a blue shirt with a cat on the middle and white jeans.

And the last made Ben blush. It was a young woman that looked about 16 or 15 years old as well. She had slightly long brown hair that reached her neck, green eyes, peach skin and had a heart shaped face, but what caught Ben's attention was this girls amazing figure. She was curvacious for her age (Large breasts and plump butt). She wore a white top with a black line on the middle, tight dark green shorts, and black/white sneakers. But what really stunned Ben was the fact that she had the first Omnitrix that he had when he was ten.

'What the hell is going on!?' Ben screamed in his head.

"Going hero!" The brown haired girl yelled as she was about to change, but she caught a glimpse of Ben. "What are you doing? Get out of here!"

"Huh?" Ben said waking up from his trance. Ben then looked to see the woman known a Dr. Animo.

"You again?!" Animo yelled. "I won't let you fools interfere with my plans!"

"Yeah right!" The brown haired girl said as she was about to activate the Omnitrix, but suddenly a flash of green light appeared which shocked the girl and her family.

"What on Earth?" The red head boy said shocked by what he and his family just saw, the boy had turned into a giant crystal like being just like his cousin.

"Let Diamondhead take care of this!" Ben/Diamondhead said as he came at Animo and took her out and her mutated bird. They where shocked by how fast this boy took her out and how he transformed. Ben transformed back and walked up to them.

"H-How did you do that?" The girl yelled, "I've could of handled it!"

"It seemed you were too busy trying to look cool to me." Ben said which made the girl blush and pout. (Ben admitted that he found her pout really cute)

The boy laughed.

"Shut up, dweeb!"

"Look who's talking doofus." The boy said back. The reminded Ben of how he and Gwen use to fight when they where kids.

"That's enough you two." The woman said to the cousins. She then turned to Ben, "I'm Maxine Tennyson. These two are Glenn and Lynn Tennyson."

Ben was shocked by this, they had his last name, "Wait, you're Tennyson's?"

"Duhh!" Lynn said, Ben sweat dropped at how immature she was.

"Yes, why do you ask?" Maxine asked.

"Well, It's kind of complicated." Ben said while rubbing the back of his head.

(Minutes later in the Rustbucket)

Ben had finished explaining what happened to him and how he ended up here, he must have been sucked into a gender bent version of his universe. This shocked everyone.

"You're from another universe?" Glenn asked in amazement.

"Yeah, I know it's hard to believe..." Ben said.

"That so cool!" Lynn and Glenn both said excitedly.

"So your a male version of my granddaughter?" Maxine said shocked, but also amazed.

"Kinda." Ben said, he was not sure if he was still related to them or not.

"Well, you can stay with us if you like." Maxine said happily. She could tell he was a Tennyson.

"Thanks, I really appreciate it." Ben said with a smile. With that they drove off to their next destination.

Ben noticed that Lynn was playing a game, he looked to see what she was playing and his face lit up.

"Sumo Slammers!" Ben yelled.

"You like it too?" She asked shocked by this.

"Uh. Yeah!" Ben said as he and Lynn played the game. Lynn blushed a little from the closeness.

'Why am I feeling like this?' She thought to herself.

'Why am I feeling like this?' Ben thought as well. This was going to be one interesting adventure.

A/N: That's my story for this pair (I know people will find this weird, but I just love the idea of a gender bent pairing, I like Fin and Fionna so yeah), I might expand it some day, but I just wanted to put it out there. The reason I made Lynn a bit immature was I wanted her to be a bit different from teen Ben (I imagined Tara Strong using her kid Ben's voice, but more feminine and tomboyish) and I wanted Ben to help her mature (but still a bit immature at times) as well and learn to use the Omnitrix. (It might even form a strong bond between the two)

Anyway, If you like/don't like this fic please tell me in the reviews and if you want more I might do a story on it. I will also add a Fem Kevin (or Karin Levin) in the story as well as for Ben's harem. (Not sure if I'll add more yet, so it will be a threesome for now)

I hope you enjoyed it!

See ya!