Moi: I tried to not get the characters OOC. I don't want them to be. So please, if there is anything wrong with the personality of one of them, let me know so that I can try and fix it! This is my first crossover fic, so don't be too nasty with me please!

Summary: Yusei's heart was always closed off to the world, like a hard cobalt crystal. But when a beautiful emerald shines it's way into his life, will the crystal's defeneses go down and shine with it? Or will it shatter into a million pieces? Rated for mild language.

Disclaimer: I do not own either Yu-Gi-Oh 5D's or GX.

Cobalt's Gem

Chapter 1: Old Friends and New

The crowd roared in excitement as he entered. He was one of the most popular in the pro leagues.

He waved and smiled, making the girls swoon with hearts in their eyes. He was cute and likeable, a perfect choice.

As he prepared for the duel, the crowd cheered and shouted his name:

"Johan! Johan! Johan!"

Emerald eyes shining with glee, he greeted his opponent with a laugh, "Long time no see my friend."

Chocolate brown eyes somewhat brightened as a ghost of a smile appeared on his now always-serious face, "Johan. It has been a while indeed."

"So, what made you decide to join this tournament? I thought you had dropped the pro league dream…Judai."

Yuki Judai shrugged, "I figured it would help me with my quest. I get to meet more people, and therefore accomplish more than I could before."

Johan sighed, "You really have changed."

Judai nodded, "I have. But let's not talk about that now. We have a score to settle."

Johan smiled, "Yep!"

They both activated their duel disks and cried, "Duel!"

Meanwhile, sharp cobalt eyes watched from the stands. The owner of those eyes was silent as usual, while his friends and the rest of the audience talked and talked about how interesting this was going to be. The Gem Beasts vs. the E-Heroes and Neo-Spacians. For a few people in the crowd, the talk reminded them of the first time the two participants dueled in Duel Academia.

"It feels like we're back at school again, doesn't it?" A bright bluenette with gray-silver eyes said in a soft voice so that only the one sitting next to him could hear.

The girl nodded, "Yeah Shou, I agree." She had long blonde hair with brown eyes that had a look as if she were remembering something in the past, but still half in the present. She was Asuka Tenjoin. The two were also accompanied by another man with spiky black hair and black outfit.

"Hey Jun, you've been pretty quiet, even for you," Asuka called, "Is something wrong?"

Monjoume turned to her and just shrugged, "I don't have a problem."

Shou sighed, "Don't try it Asuka. You know what he's like."

Asuka smiled and nodded in agreement. The three turned back to the duel.

TIME SKIP

Judai ended up winning. Johan drew his next card after the duel, and chuckled. Rainbow Dragon showed up a turn too late.

"Great duel Johaaaan!!" A small voice shouted. Johan jumped and turned to the voice. He laughed as Rua and Ruka jumped into his arms in a huge hug.

"Even though you lost," Ruka said, "You were still great."

Johan set the two down and patted their heads, "Thank you."

Judai blinked, mild confusion in his eyes. Johan saw it when he looked up and smiled at him, "Judai, this is Rua and Ruka. They're my friends."

Rua and Ruka turned and Johan introduced them, "You guys, this is an old best friend of mine, Yuki Judai."

Judai inclined his head, and the twins smiled and waved.

"You're really good Mr. Yuki!" Rua complimented.

"Thank you," Judai answered.

"Hey, do you have any place to stay for tonight? Because you're welcome at our house! If you're a friend of Johan's, you're ours too!" Ruka asked. Judai was about to say that he appreciated the offer, but he couldn't accept it, when Yubel's voice echoed in his mind,

Judai, maybe spending some time with Johan might be a good thing.

What do you mean by that? Judai asked.

But Yubel didn't answer. Judai inwardly sighed, Fine then, don't answer me. If you really want me to, I guess I'll do it.

He felt Yubel's approval as he said, "Thank you for the offer. If you really don't mind, I would like to take you up on it."

Johan and the twins smiled brightly and almost instantly Johan had grabbed the brunette's wrist and dragged him off with Rua and Ruka out of the arena and into a limo. Judai and Johan's duel was the last of that day.

Johan pushed Judai into the huge car, and Judai crashed into it, saying,

"Whoa Johan, what's the rush?"

The bluenette laughed and jumped in across from him, "Just making sure you don't change your mind at the last second!"

The twins climbed in and shut the door behind them, sitting next to Judai.

A small groan came from beside Johan and a shape in the most shadowed part of the limo moved. Judai looked at the shape to find it being a man who was taller than Johan by only an inch. He had raven black hair with weird orange streaks. He had on a navy blue jacket and brown gloves, with dark jeans and brown boots.

"Ah, sorry Yusei, were you sleeping?" Johan asked sheepishly.

"No I wasn't, I was just out of it a little," the man said. He looked at Judai, "You're the guy who beat Johan. Yuki right?"

"Oh, right, Yusei this is Judai, remember I told you about him?" Johan said before Judai could say anything, "Judai, this is Yusei. He's also a friend of mine."

Judai inclined his head and Yusei returned the gesture. Johan inwardly chuckled and thought, The new Judai and Yusei have a lot of things in common. I hope they get along ok.

But something told the Gem Beast duelist that he shouldn't be so hopeful.

Ok, first chapter up! Review please!!