Falling… Falling… that's all Natsu felt as he plummeted down the side of the mountain. Team Natsu had only went on a low rank hunting and gathering job, the village that contracted them wanted a giant boar and an assortment of herbs and spices for a feast they were holding. Usually it was a piece of cake for them, but this time the boar got the drop on the team and launched Natsu of the side of a cliff.
There was a collection of "Natsu!" and "Holy-!", Gray was the first one to jump into action. "Ice Make: Hook, Chain." he stated, the Ice mage created a grappling hook and jumped off tossing the hook around a tree as he fell.
"G-Gray help me!" Natsu yelled as his fellow mage appeared beside him. Gray noticed a a cave just a few feet below them as they fell, using his momentum he swung and tackle-grabbed Natsu into the hole cavity. As they were rolling something happened, a body made of fire was slowly being encased in ice, when it finally was fully encased the new ice body began to steam and then it exploded sending chunks of ice everywhere, in it's place was a male body forced to the floor. He had dark pink, mid length spiky hair; he wore Natsu's vest and Gray's shirt, but the shirt fit him more like a crop top that exposed his well toned belly, his pant were Gray's skinny jeans but colored like Natsu's trousers. The man was pretty tall, a bit taller that Elfman and Laxus.
He held both hands to his face as he slowly awoke. "Gray… Natsu?... What happened to your- my-... our body?..." he asked perplexed. "Gray, Natsu, Lucy and I are coming down to check on you." The heard Erza say.
"Gray, we have to seperate now!" the male whisper yelled aloud. "I don't know how Natsu!" he whisper yelled back to himself in a bit of panic. They were too late as their two female companions entered the cave to check on Gray and Natsu.
The two women were met with a very attractive and tall man as they entered the cave, the two women blushed and Lucy even started to nosebleed a little. They saw an adonis of a man with a nice muscular, toned body, but he wasn't big or swol like Elfman or Laxus. "Ugh Uh, Excuse me handsome man, where are our friends? A pink haired boy named Natsu and an Ice mage named Gray." Erza asked through stammers.
"Erza it's me! Us! Gray and Natsu!" he yelled. He rolled up one sleeve and put two thumbs in his shirt and lifted it like a female flasher as he exposed two purple guild insignias. After a few seconds of mental processing all three of them exchanged screams of shock.
Ezra, Lucy and Gray-Natsu… they were gonna have to find a better name for him eventually, walked back into the guild hall and everyone stopped to look at him. Cana was the first to approach, "Hey sweet cheeks, can I fetch you a drink?" she offered. His face turned, his eyes widened and grit his teeth in shock. "N-no thank-you." he managed to decline.
After that Gray-Natsu was getting catcalls and whistles as he walked, turns out he had that kind of attractiveness where someone could be attracted to all men or all women, but then there's that one percent chance and event where they're attracted to the same sex. This was made evident when Elfman had them pressed up one of the guild's support beams, he was going full casanova, one hand on one hip and the other he placed on the wall next to Gray-Natsu's head, the fusion looking away in awkwardness trying to avoid direct eye contact.
"Wanna go on a date with a real man?" Elfman asked/flirted as he leaned in closer. Gray-Natsu's eyes widened and a blush appeared on his face still looking away from the Take over mage. Lucy and Erza did mock hurls in disgust, Erza managed to say, "Get away from Gray and Natsu Elfman."
Upon hearing that Elfman just looked down at the boy beneath him, a tumbleweed could blow through the guild hall it was so quiet, and Gray-Natsu looked back at Elfman with and awkward smile. "Hiiiiiieeeeee Elllfmannn." they dragged out giving the burly man a shaky wave.
"Eeeeeeehhhhhhh!" Elfman yelled as he stepped back and sat on his butt in shock. Many other guild mates rose from their seats and looked on. "Natsu, Gray how did this happen to you two?" Levy asked since everyone else was too shocked to.
"I- I don't know, Natsu was sent flying on a cliff and Gray went to catch him, then there was fire and ice and I think a little steam and then we-" his almost belligerent stammering was cut off by a new voice. "-and then you fused…" Makarov finished as he descended the steps and went to stand on the bar counter. "Gather round children, and I'll explain this phenomenon." he stated.
After a few seconds everyone gathered around their guild master waited on him. "This is a form of fusion magic a step beyond a meer Unison Raid, whereas a Unison Raid is difficult because the wizards have to have similar magic output, fusion is on a completely different scale of difficulty." he stated. Everyone heard on in shock, 'A different scale' 'And they could fuse flawlessly on their first try.' they all thought.
"You have to be in sync with your partner physically, mentally, and emotionally, and another key factor is trust." he added. "Trust?" the guild asked a bit perplexed. "You have to trust your partner with your body, with your everything. In that moment when Natsu fell they both wanted to come out safe, and they both trusted each other to make it so. I'm just surprised they did it with simple body contact, many fusions require a dance to form." Makarov finished.
Gray-Natsu was the first to break the silence, "Well… while I'm glad my components trust each other so much, they have their owns lives so I can't stay Gratsu forever." "Gratsu?" Lucy asked.
"Well yeah, I need a name. Ya can't keep calling me Gray-Natsu, and you can't call me Gray or Natsu… So gramps, chop chop, how do we split up." the fusion quipped. Makarov squinted his eyes, anger beginning to form; he expanded an arm and bonked Gratsu on the head.
"Gah!" he whined in pain. For a split second there with two bodies, one made of complete fire and the other of ice and then Gray and Natsu fell into some furniture, being ejected from their fusion. They both groaned as they manage to pick themselves up into a seat, "In time you'll learn to naturally defuse on your own, till enough damage or shock can destabilize you… I guess now is the perfect time to teach you all fusion. I'll teach you all fusion bright and early tomorrow morning." stated Makarov
a/n I don't plan on this being a Gratsu romance unless there's enough want for it… Fraxus however *blushing devil face* but it won't be what the story is about. Just think Fairy Tail but now everyone can fuse.