Okay so in this AU it will be set in normal Fairy Tail AU BUT only Natsu and the reader use magic. Also no one else know who they are even though they use their real names and not superhero names.

At this time there were only two magic users. One was a boy named Natsu and the other was girl named (Y/n). It was impossible to know who were the two magic users. Their names were the most popular in the city after all!

"Again the evil superhero, (Y/n), caused a panic in the city!" A newspaper boy shouted across the crowd. He sighed and took in another deep breath, "extra! Extra!"

"One news paper please." (Y/n) smiled at the boy.

"Oh, hey (Y/n). Didn't see you at school today. Than again we don't have classes together anymore..." He blushed, "maybe we could catch up sometime?"

She smiled and kissed his cheek, "yes of course Gray! If there is a day where you don't have to work or I don't have too. Well I'll let you get back to yelling now, I hope you sell a lot today."

Gray's blush deepened, "t-thanks (Y/n). B-bye!" She waved to him as she walked away, her smile was replaced with a smirk.

He's wrapped around my finger, that was easy. She thought, planning her next move. Soon I'll have Natsu wrapped as well as this whole city. That is if I don't reduce it to rumble first.

(Y/n) walked up the many flights of stairs before unlocking the door to her shared apartment. She opens the door to find Natsu, her roommate, looking at a flyer. "What ya go there?" She asked, closing the door and locking it back.

"You know how I've been wanting a cat..." He started off.

"Yes and you know about how we can't have cats in this building...." She replied, looking at him before walking over to him.

"But they got this super cute one! Look!" He shoved the flyer in her face. "He's blue and his name is Happy! And I've always said that I wanted to a blue cat named Happy!"

"Natsu you've always said 'I want a pet dog' never a cat." (Y/n) replied, taking the flyer from him. "Besides we can't have pets here, we've already tried remember. It's not like we can afford to live in another apartment." She kisses the top of his head, "I'm sorry, Natsu."

"Nah it's all good." He said with a small smile, "I know we can't have pets, I just wish we could. Anyway," he stands up to grab the newspaper and hand it to her. "Looks like (Y/n), the evil superhero, has a target." He shows her the front cover.

This city is so dumb. (Y/n) thought but acting like she was learning band new information from the newspaper, as Natsu was reading it out loud. It's me! I'm the evil superhero! Hello that picture looks just like me!

"Looks like she goes after men about ten years older than us. They have brown hair and brown eyes. No wonder there are so much attacks!" Natsu laughed, "she must be stupid to think that every man with brown hair and brown eyes is bad! Or whatever her reason for attacking them is."

"Yeah she must be..." (Y/n) mumbled, reading over the newspaper.

"So back to the cat, I know we can't get him but can we at least go and pet him! He needs some love!" Natsu pleads, "I won't ask for anything ever again!"

Knowing that those words were a lie, she agreed. "Yes we can go look at Happy. I don't know why you are asking me. Why can't you go by yourself?"

"Because we're friends and I haven't seen you a lot lately. Just wanted to hang out with you, that's all." Natsu replied, grabbing his coat.

----

As they walk through the cold and crowded town, (Y/n) was looking for the men the newspaper described. Natsu was right about their being a lot of men who look like that. Still, she wasn't about to give up any time soon.

When they arrived at the animal shelter, a man with brown hair and eyes greeted them. He also had a scar on his cheek and above his left eye brow. (Y/n) looks at him a little more closely, paying more attention to his face rather than what he was saying.

"Welcome, are you looking for anyone off of our flyers?" He asked in a sweet and calm voice.

That's him! (Y/n) wanted to shout but bit her tongue. Even though it's close to closing time for the shelter, Natsu is still here... Then it hit her, a way to get the man away from everyone else and Natsu.

"Umm, sir?" (Y/n) asked in a very polite voice. "Could you show me where the dogs are?"

He nods and points to a hallway across from the cats, "right down there."

"Thank you, I'll catch up with you later Natsu." She waved and made her way to the very last dog.

"See you!" Natsu replied and went to see Happy.

The dog didn't pay (Y/n) any attention as she walked by. She went inside the dogs crate, which was large enough for her to just walk in, and transform. She pets the dog on the head and walks out. To her convenience, the man was walking back from helping Natsu find Happy.

Natsu's back was turned the whole time, the man was getting closer to her. It was now or never. The scars are prof that this was the man she had been looking for. All these years, all the attacks have led up to this moment. It's a sham it had to be in an animal shelter.

She approached him with a deadly glare and the man looked to see her. "I-It's (Y/n)! Run-" She covered up his mouth.

"Come on now, you don't remember me?" She asked in a very creepy tone, trying to scare him even more than he already was. "Working with animals now? Is this a way to fix what you did?"

He shook his head violently. Natsu looked at them, (Y/n) and the man had their backs to him. That means that she's the evil superhero, right? He thought as he transformed.

"I could kill you here and now, you're lucky I love animals. I won't want to scar them like you did to-" (Y/n) was cut off by a punch to the back. It felt like someone set her back on fire.

"So you're the only causing all these attacks!" Natsu roared at (Y/n). "You! Of all people! Was being all sweet and nice with everyone all a big joke! You messed with people's feeling (Y/n)!"

She whips her head around to see Natsu looking at her with so much hurt in his eyes. The man tried to escape but (Y/n) caught him before he could leave the building.

"Listen to me (Y/n)!" Natsu shouts, approaching her. "I don't know what this man did to you. But that's in the past now. Revenge is never the answer. I know that you have been playing all of us since you are the villain after all. But that doesn't matter now! This man has changed, and so can you." He put a hand on her shoulder but she never loosed her gripe from the man. "(Y/n) please, let's just go."

Maybe Natsu's right. Maybe I have these powers to help people and not hurt them. But still how could I forgive him let alone let him live! So many thoughts have been running around in (Y/n)'s head since she saw this man and his scars. Natsu took this chance to knock (Y/n) out.

----

(Y/n) woke up in a panic. What happened!? Where am I?! Where is he! Where did that man go!

"It's okay, you're safe now." Natsu said, leaning against the door frame. "The man is behind bars now. I knew about his scars from long ago and called the police. Of course I carried you away from the scene before they arrived."

He moved to sit down next to her, (Y/n) sat up to face him. "Why did you stop me?"

"Because I know that you would have hated yourself if you killed him." Natsu replied, "you're a good person (Y/n). Whatever he did to you, he will pay for it now. But I have to ask, what did he do?"

He's right about that. She thought, regret was always on my mind. Killing him would never leave my thoughts if I did.

She took in a deep breath and began to tell Natsu everything. He had always been there for her and she had always Beene there for Natsu. "So basically, he killed my family. I was at school at the time so he didn't know about me." She said after telling him the details.

Natsu was shocked at her story. All the heartache and pain it must have been to go through all of that. He held her tightly in his arms, "I'm so sorry. Now I understand why you wanted to get back at him. But you made the right choice."

She nods, "thank you Natsu. For stopping me when I wasn't thinking clearly."