"Park there." Erza directed as she pointed to a small unoccupied space for Max to park. "I take it, that means we've arrived?" He asked as he glanced back at the group of sleeping Fairies.

"Huh, they must have been real tired if they fell asleep for such a short trip." He stated before he noticed that the blue cat creature, Happy was slowly reaching out to touch the Omnitrix.

Before Max could say anything, Happy had touched the dial only for it to suddenly turn yellow and emit a loud beep that woke the rest of the group.

"I'm up!" Lucy exclaimed as she shot upright from where she was sleeping only to blink a couple of times before realising that they'd fallen asleep on the RV. "Wait what did I miss?"

"Oh nothing much just-" Max began to say only for Ben to interrupt him when he realised that the Omnitrix had acquired a new D.N.A sample. "Woohoo! I've got a new alien!" He exclaimed while pumping his fist into the air. "Thanks Happy!" He gave the cat a thumbs up.

"And your thanking the cat, why?" Gwen asked while the rest of the group looked at him with curiosity. "Happy touched the Omnitrix and accidentally gave it his D.N.A." Ben revealed as he fiddled with the Omnitrix, "And that means I can now transform into him!"

The Fairies blinked in shock for a moment as the explanation slowly sunk in, "What?!?!"

"I know right!" Ben smiled before turning to look at his grandfather. "Also... Are we there yet?" He asked causing everyone to fall to the ground in surprise.

Max sighed before point out the front window, "Yes, Ben. We've arrived." Ben and Gwen's faces light up in excitement as they hurriedly ran over to the RV's door and opened it. Soon the rest of the group began leaving the RV as well with Happy carrying an unconscious Natsu who, upon touching the ground, immediately shot to his feet, shocking the Tennyson's.

"What the heck?!?!" They exclaimed in disbelief while the Fairies could only smile at the familiar scene. Soon, Erza turned to the three Tennyson's, "We should probably go inside if you want to join the guild." She suggested as the rest of the group began making their way inside with Lucy standing beside the door and holding it open.

Before entering the building, Ben briefly glanced towards his grandpa who gave a nod of encouragement towards him.

The inside of the guild was nothing to write home about but it had a certain homely feel to it that Ben immediately noticed as a beautiful white haired woman walked over to greet him.

"Hi, I'm Mirajane and you are?" She extended a hand out to him. "Ben, Ben Tennyson and me and my family -"

"My family and I." His cousin corrected much to his chagrin. "As I was saying before I was interrupted, my family and I were looking to join a guild and we just happened to be passing by Magnolia, which from what we heard was home to the strongest guild in all of Fiore." Ben continued as he glanced over at Erza who gave him a reassuring smile before he looked back at Mirajane.
...
A couple minutes later and Mirajane was placing a green Fairy Tail under his left collarbone much to his excitement, while Gwen had a pink one placed under her left shoulder blade and Max had his own mark placed on his right ankle.

"There, all done." Mirajane smiled as she dragged the stamp away and Ben readjusted his shirt before running over to the guilds bar where Max was currently sitting. As he ran up to the bar, he noticed his cousin sitting next to a blue haired woman and laughing happily as if she was told a really fun joke.

However, as he walked towards his Grampa, Natsu suddenly called out to him with a huge grin on his face. "Hey Ben, now that you've joined Fairy Tail how about you and me have a battle?" His request shocked everyone present, Ben included before a huge grin broke out on his face, "Oh it is on!"

Max slapped his head, "How did I see this coming...?" He muttered before taking a chug from his drink. "Ugh... We've barely just joined the guild and Ben's already getting into a fight..." Gwen muttered while Levy patted her sympathetically on the back.

"You get used to it." Jet said as he shrugged, "If anything, I'm more surprised by the fact that Natsu didn't immediately challenge you to a fight the moment he learned that you could fight." Gwen blinked in surprise at the surprised fact, "Your kidding. Right...?"

"Nope!" The quick reply cause her to look over at her cousin in worry as she questioned what he just got himself into. "If that's the case then how strong is Natsu?" She asked looking over to Levy for the answer.

"Pretty strong but unfortunately that means he's also the most destructive in the guild." She answered with a smile much to Gwen's surprise.

"So on a scale of 1 to 10 how bad can we expect the damages to be?" Levy raised an eyebrow at Gwen's question, "Well if Ben is as strong as he claims he is then I'd say that a six maybe a seven."

Gwen sighed before leaning back on the table, "That bad, huh?" She raised her hand as a blue sphere of magic appeared around her hand much to Levy's curiosity.

"Oh, what kind of magic is that?" Levy asked but before Gwen could reply she realised that Ben and Natsu had already stepped outside.
...

"You ready!" Natsu called out as Ben stood opposite him, fiddling with the Omnitrix. "I was born ready!" He replied, "Now I'll show you some real firepower or should I say Diamond Power!" Ben slammed his hand done the devices faceplate.

The audience watched in shock as a flash of green light enveloped the boy. When the light had faded, Ben was replaced by red metallic alien. It had two containers filled with water on his head with black mask-like markings around his green eyes. In addition to that, he has two tubes of water reaching from a respirator where his mouth should be all the way to his back, while his forearms were filled with water. His hands had three black fingers each and he had two black toes on each foot. The Omnitrix could be seen on the aliens stomach.

"Wait what? Who's this guy?" Ben said as he looked at himself. While he was examining himself, Natsu suddenly leapt towards him with a fire in his hand, "This'll be fun!"

Ben instinctively raised his arms up to his face and just moments before Natsu's fist connected to him, water suddenly burst forth from his wrists and forming a shield of water blocking the dragons slayers attack, shocking everyone present.

"He blocked Natsu's attack?" Grey questioned as he rubbed his eyes to make sure he wasn't seeing things.

"I can control water? Sweet!" Ben said before shoving his fists forwards causing Natsu to tumble backwards to the ground. "Alright then, let's see how strong really are."

Narrowing his eyes in concentration, Ben reshaped the water shield into a blade, stunning the audience while Natsu blinked in shock before a huge grin formed on his face. "Now we're talking!"

Leaping to his feet, Natsu began to charge towards Ben as another fire began to form around his clenched fists. "Fire Dragon Iron Fist!"

As Natsu flung himself forward, Ben lashed out with his left fist forming a water whip that wrapped itself around Natsu's waste.

"Huh?!?" Was all Nasty could get out before Ben yanked the hydro whip with all his might and sending the poor Dragon Slayer into the ground. Not letting him recover, Ben leapt forward forming a hammer in his hands and slamming it down onto his head, sending small chunks of stone into the air.

Ben stood back to admire his handy work with his hands on his waste, "And that's a wrap. Now then what should I call this guy?" He said as he struck a thinking pose.

"Ohhh, I know!" Levy yelled, grabbing his attention. "How about Overflow?" She suggested. Ben thought for a second before beaming in happiness, "I like it! Overflow it is then!"

As he turned to leave, a column of fire suddenly appeared before him, "Huh?!?!" He stumbled back in shock, "Did you really think you beat me??" A voice called out from behind him, shocking the alien hero.

Before Ben could do react, he was suddenly kicked backwards by Natsu. "Hahaha! Serves you right for turning your back on me!" He laughed but Overflow retaliated by delivering a sucker punch to his face.

Next, Overflow unleashed a blast of water at the Dragon Slayer freezing him into a block of ice shocking everyone. 'He can manipulate ice too?!!?' Grey thought in disbelief.

"It seems Ben is far stronger then we originally estimated." Erza crossed her arms before smiling, "It seems things are about to get more lively here from now on."
...
Overflow walked over to the frozen Natsu and pulled back his fist to deliver a powerful punch but a familiar beeping sound came to us attention, "Aw man! Not now!" With a flash of red light Ben was back to normal.

"And the winner is Ben Tennyson!" Makarov announced as Happy flew over to the still frozen Natsu while everyone else began to congratulate Ben.
_______________________________________________
I really struggled with this chapter a lot and it didn't help that I came down with a small sickness for a bit that really hampered me but still I finally finished it. Also I've managed to finally watch almost all of the Ben 10 shows except for Omniverse which I'm currently watching at the moment.

Of you have any suggestions or questions put them here:

Next time: First Quest

Ben and Gwen take on their first ever quest as members of Fairy Tail, how well will that go? Especially when Erza tags along with them. Who is the quests contractor and just who is that beautiful blue haired girl that Ben keeps seeing? Only one way to find out.