Both yugiohfan163 and I do not own Ben 10 (any version of the show, if I did then I would have kept the stuff happing in Ultimate Alien, granted Omniverse is ok just the stuff the retconned is really stupid that it makes my head hurt)

Ben 10: the Champion of Earth

A day after the Anihilaarg event in Ben Tennyson's room
A teen who has Brown hair wears a shirt which is black and has a green stripe in the middle with a white 10 and green stripes on the sides of his shirt. He wears brown cargo pants with pockets at the knees and green and white shoes. He is also wearing what looks like a wrist watch that is actually an alien device on his left wrist. This person is Ben Tennyson the hero of this universe and he was laying on the bed thinking about what happened yesterday.

The day where he and his partner Rook found out about a dangerous device called the Anihilaarg.

Ben thought to himself 'I can't believe that that there is a weapon that can actual destroy a universe'

Luckily he was able to bring back the universe when it was destroyed, but the fact a device like that existed made him a little scared.

Ben then thought 'I don't know what changed and what stayed the same in this universe.' Unknown to him the only thing that changed in this universe is that Kai has gotten worse.

He was snapped out of his musings as he heard his phone go off.

Ben saw who was on the phone and saw that it was his girlfriend Julie, which he answered "Hey Julie."

Ben replied "Sure thing Julie." To which Ben leaves to go to her house.

Julie's house
Julie opened the door and said "Hey Ben, can you help me train in being a hero like you?"

"...wow. That I was not expecting." he admitted.
Julie then said "I want to help you out and also spend more time together with both of us as heroes since you have a lot of time saving everyone, so it is best for me to at least become a superhero with ship and help you and Rook."

"But Julie, this is serious. You'll be putting your life on the line every time you go out and save lives. I'm not sure." spoke Ben who was worried for her.

Julie replied "I already know it is serious, I been thinking about this since the Diagon incident, and I am already in danger just for being your girlfriend. At least doing this I won't feel like I am dead weight on your shoulders."

"Julie, you're never dead weight. I just don't want you to risk your life."

"I know Ben but remember your identity is already seen in the public eye which also makes me a target and for other super villains to torture me or kill me just to get to you."

Ben sighed as everything she said was dead on.

"This is the only way I can think of Ben and trying to convince me otherwise is like trying to convince you to not go to Mr. Smoothy."

"Alright, alright. I'll help you."

"Thank you Ben." She then kiss him on the lips for a little bit then both of them go to the backyard to start their training.

Julie's Backyard
"But I don't know how I can help much."

"I want both of us to train me both with and without Ship since there is a possibility that I might get separated from ship by attacking me with the Omnitrix."

"Well then, maybe some stretches to start off."

Julie stretched ready to train.

"Maybe try some light punches to know how to throw them."

Julie with her fists up "Get ready Ben."

Ben grinned and held up his own fists.

Julie tries to punch him.

He dodged and easily ducked and side stepped each fist.

Julie kept on trying to punch Ben and missed every time.

"Stamina is something else to work on." he commented seeing her slowly pant.

"Jogging usually works for me."

Ben blushed at the sudden idea of going farther.

(Lemon starts)
Julie's room
After their training Julie was getting ready to have sex with Ben since basically both of them were meaning to bring their relationship to go farther.

Ben however was hesitant since he never did it with a girl.

Julie came out in some sexy lingerie with a blush on her face "how do I look Ben?"

Julie did a twirl. "You like it?"

Julie with a blush saw Ben's erection.

She sauntered over and pushed him on the bed before climbing on top.

She kissed Ben on the lips and fondled his erection.

He let out a hiss as her soft hand moved up and down his cock.

Julie softly rubbing his penis more a little bit worried she might mess up since this is the first time she has done this.

She moved up and started kissing Ben while rubbing him.

Julie also moved his hand to her moist snatch while she was fondling him.

Ben slowly rubbed his fingers against her moist cavern.

Julie gasped in enjoyment and rubbed his cock more.

Both moaned as their bodies tingled with pleasure.

Both of them were close to their limit in foreplay.

"I feel something." moaned Julie.

Same here." Moaned Ben

Both kept going before groaning as they orgasmed.

Julie and Ben, now ready for the main course. "Take me Ben."

Ben had Julie lay on her back before lining the tip of his dick up with her pussy.

Julie moaned as his penis touched her pussy.

He slowly moved forward and gasped at how warm it felt.

Julie winced as her hymen was torn.

Ben stopped as he saw the tears.

Julie comfort him and said "It is ok, I am fine."

Ben nodded before slowly pulling back and going back in.

Julie moaned as Ben was slowly fucking her enjoying the feeling of Ben in her.

"So tight." he groaned.

Julie blushed at that and replied as Ben started going faster "So big."

The bed creaked under them as Ben started going a little faster.

Julie grabbed the sheets from the intense pleasure she is feeling from Ben.

"I'm going to cum." he grunted.

"Same here." she moaned.

He kept going before groaning as he started Cummings.

He groaned before shooting his sperm inside her.

She enjoyed the feeling of having his in her and French kissed Ben.

He gladly returned it as they laid on the bed beside the other.

Julie departed and said "I love you Ben." Which Ben replied "I love you too Julie."

(Lemon end)

Julie also remember something "Ben I been meaning to ask you, are you still considered the earth's champion right?"

"Yeah, why?"

"Well galactic law also states that the champion of each planet is allowed to have more than one mate be it from alien species or the champion's species."

"Really?"

Julie nodded "Yes, I was doing research on it incase other conquers want to fight you which I came across that, so yah apparently you can get a lot of girls as your harem girls however you still have to at least talk to me about which girl."

Wait, you're all for me getting a harem?" asked Ben in shock.

Julie sighed "Yes, believe me it wasn't that easy since I hated the idea at first but then after some consideration for about a week you have my blessing."

"Wow."

"Yah."

Author's Note

I want to thank yugiohfan163 for helping me with this fic and those that offer ideas who you think should be in Ben's harem tell me in the coments and flamers will get deleted but I will allow critisim that wants me to get better, just please be nice.