That one time
I see that a lot of people like this story. I am offering a spot with someone's OC to be a bad guy. Infinite out.
The same day
The dragonslayers and exceeds were on their way to the Dragon's Fury guild. On the main road a few miles from Fairy tail. "Alright we will keep going until we see the sun setting." Natsu said. The sun was in the middle of the sky. "Who made you in charge salamander? If anything I should be in charge." Gajeel argued. "I'm not leader, I'm just telling what we are going to do." Said Natsu. "This is a type of way of being leader!" Gajeel shouted. "Ahhh shut up, Gajeel I know how you feel about Levy but Natsu should be leader here." Said Pantherlily said. "No I'm going to-" Gajeel said then was encased in ice. "Now he might shut. I just want to prove myself." Said Rena. Everyone didn't say a word after that they continued walking towards the dark guild. At sunset Gajeel was freed out and they fixed the campsite. They ate and came up with possible strategies. They had five tents, Happy, Carla and Pantherlily had one. Natsu had one, Gajeel had one Wendy had one and Rena and Tinker had one. Each was assigned a color for there powers. Happy waited till the moon was full view at midnight, then he woke Carla up. "Huh, yes Happy? What do you need?" Asked Carla barely awake and whispering. "I need to show you something, come with me." Said Happy. Happy showed Carla a cliff that had the world's best view of the moon. They sat there for a minute, then Happy got on one knee and asked a question. "Carla we have known each for away and I think the time isn't perfect but, Carla will you marry me?" Asked Happy with a tear flow down his fur. "Yes, Yes Happy I will marry you." Carla said shocked but very happy. Then the two exceeds heard clapping in the background. "Well, that was beautiful. To bad it isn't going to last long." Said a yellow fur exceed name Tinker. "Why, the world is possibly at piece right now." Said Carla. "Carla stay back, that isn't Tinker." Said Happy standing in front of his fiancé. "Good job, you are smart." Said the shape shifting person. Happy saw Natsu in the back ground walking slowly towards the boy. "Well now your stupid." Said Happy. "Really?" Said the boy as he shot a beam of ice at Carla then Natsu tackled him. Happy jumped in front of the beam and it hit him in the leg. Natsu then threw the boy away like garbage. Then he ran to Happy's aid. He took him and Carla to the campsite. "How far is it to the next village?!" Natsu said running."About seven miles, why?" Asked Rena. "Happy hurt, we need to get him to the hospital. I'm going back to Magnolia." Said Natsu. "I'm coming to, it was my fault he is hurt and it would be quicker." Carla said about to start sobbing. Then she felt something on her hand, it was Happy's. "It wasn't your fault, don't worry. Carla, I... love... you." Happy said then fell unconscious.
At dawn the next day (Natsu POV)
On the main, I had just gotten to Magnolia. I ran for Fairy tail, so they can heal Happy. I was going to stay and protect Happy, but Carla and the others told me to go back and fight. I ran out the doors towards the dark guild. I was running as fast as I could, it felt like the 24 hour endurance run again. I was running at least twenty miles per hour, I was going to catch up to the gang quickly. At mid day, I found the campsite. I decided to use my hands as boosters. Occasionally I would stop and take a breather, but at sunset I caught up to the team. "Hey guys, sorry I'm late what I miss." I asked. They all turned around, with angry in there eyes. "They took, Rena and Tinker. I heard them being tortured." Said Gajeel. Wendy fell to her knees and cried. "It happened as soon as you left, I went to look in the bushes. Wendy was in her bag and Pantherlily was ahead. They came out of nowhere and took them." Pantherlily said as he went to comfort Wendy. "This is your fault Salamander!" Gajeel yelled. "Well what was I suppose to do? My best friend was going to die!" I yelled back. "Enough. We have to save them." Said a familiar voice. It was Erza, with Gray, Lucy, and Laxus. "Now we have to go to this Dragon's Fury place now." Said Laxus. Now everyone decide to get revenge and save our friends, it was a long were quiet for the rest of the way then we saw it. The dark guild, it was a skull of a dragon with a few iron bars to keep it up. Now we have some things to say to this guild. I ran first in, there were hundreds of members in there. "Which one of you decided to mess with fairy tail?!" I yelled so everyone could hear me. "I did, is there a problem loser?" Said a boy. That was the boy from last time, the one who hurt. I was so mad, my whole body was on fire. Then the others came in, all the members surrounded us. They came at us, a few strong about like four. The rest were weak, I went after the boy. He tried to get away from me, but I got one good punch to his face. A mask fell of his face, well her face. It was Rena, the ice dragon. I knew she was a bad guy. I was so angry, I picked her up and threw her across the room. She hurt my friend now I will hurt her. I felt a hand on my shoulder, it was Erza's hand. She hugged me, I knew that I got my point across. The others easily defeated the guild members, the only bad thing was. "Where is Tinker, maybe she is bad to?" I asked walking to the others. "Let's not find out, let's go." Laxus said. We ran out, and made our way to Magnolia.
Back at the Dragon's Fury
One of the members got up and want to Rena's body. "Good job Rena, since you betrayed your friends your friend won't die." He said. Rena was on the ground crying, and said. "I'm sorry Natsu, they have the real Tinker. They took her away and threatened to kill her if I don't betray you guys. I'm sorry." Rena said sobbing on the floor.
Plot twist, well hope you guys enjoy the story. I going to take a little bit to come up with something to get Rena back. Well for now, they are going to go back to their normal lives