(Superhero AU with the sense of a cartoon)

Igneel Dragneel was a mere scientist, but his experiments brought upon his son, Natsu Dragneel great superpowers. He has enhance abilities such as great strength, speed, and flight. Natsu has used his powers allowed him to become a superhero known as Dragon. He only use his powers for good and fights the criminals of their city. At the moment, Igneel is at work at his lab, which was also connected to his home. He was in the middle of work when his twenty-something son came walking in.

"Hey, Dad. I took out the trash, cleaned the kitchen, and I managed to stop a bomb in the city from going off." Natsu listed as he came walking in.

"Great, Natsu. Thanks and good work." Igneel said as he was working a large batch. There was an industrial size tank filled with a white substance that Natsu had no clue on what it was.

"Dad, what are you working on?" Natsu asked.

"I'm actually using this to study pheromones that affect hormones." Igneel said.

"Hormones?! What?!" Natsu said as he wasn't sure he liked the sound of that.

"Some animals are drawn to others based on scent." Igneel said. "Scent plays a big part in communication for some animals while others use it for tracking and hunting. However, are drawn to each other based on scent. I'm trying to study how it works and to see if humans are affected in such a way. If my hypothesis is right, humans will be affected by the scent and feel hormonal or a strong sexual desire. Of course, I haven't made to human trials yet so there's no telling how they could affect us."

"And you need this industrial sized fish tank to do that? Isn't that overkill?" Natsu questioned.

"Hey, you either have to go big or go home. Besides, this experiment seems to be more complicated and complex than I expected seeing as how humans sense of smell isn't as strong as most animals. I need to make sure I have a vast amount." Igneel said. "Which reminds, you best not let any of this stuff get on you, Natsu. Just as I said, I don't know how a human would act if they come in contact with this stuff."

"Dad, if you're looking for some companionship, there are other ways." Natsu said as he had a feeling on what his father was really trying to do.

"That's not what this is about. I didn't need something like this to get your mother." Igneel said. "Besides, I need something groundbreaking. I can only imagine what he's doing." He claimed as he thought of one man that he despises. Someone he has a strong rivalry with.

...

Another Lab

The man that Igneel was talking about was a fellow scientist named Jude Heartfilia. The two of them had a rivalry and always trying to out do the other. The rivalry is so heated that those two can't really stand each other, not to be said about their children. Speaking of which, as Jude Heartfilia was working in his lab, his daughter came walking in. Lucy Heartfilia came in and brought him some food.

"Here's dinner, Dad." Lucy said.

"Thank you, Lucy. Did you finish the lessons I left for you?" Jude said.

"Yes, but I'm in my twenties. I should be done with homeschool." Lucy complained, but her father wanted her to follow in his footsteps. "What are you working on?"

"Something that will show Igneel Dragneel who the better scientist is." Jude said.

"Dad, you should let this go. You're a grown man that is getting, I'm sorry to say, old." Lucy said. "How much longer are you going to hold on to this rivalry?" He didn't really answer that and just ignored his daughter's questioned. "Fine. Just make sure you to go bed early. It's getting late out."

"I will." Jude said and his daughter left her alone. "Oh, honey... I'm also working so hard to find a cure for you." Yes, there was something off about Lucy Heartfilia. As she was walking through her home, she suddenly felt something in her awakening. Just like Natsu, Lucy too was exposed to her father's experiments, but they had a different affect on her. Suddenly, Lucy's body was surrounded by energy and was transforming. She transformed and wore black skin tight spandex to show off her curves and had no legs. She also wore black boots with heels. She had on blue gloves, her hair was tied back, and had a black star-shaped mask over her eyes with a blue N over chest. Without her knowing, she becomes the villainess known as Nebula, known as the queen of mayhem and destruction.

"Here we go again." Lucy Heartfilia is unable to control the transformation. It could happen whenever wherever. That's why Jude Heartfilia tries to keep her close until he can cure her. When she does transform, she acts like a different person. "So, Daddy doesn't like Professor Dragneel getting the better him? Well, he's surely to do that if his rival's lab suddenly breaks apart."

...

The Dragneel Lab

"Dad, why do you seem to despise Jude Heartfilia so much?" Natsu asked. "Don't you think your rivalry getting a little out of hand. Plus, his daughter is quite the looker."

"Natsu, don't you dare get involved with that girl." Igneel said as his rivalry with him seems to be that strong. "Besides, I remember you got real competitive with Gray Fullbuster and Gajeel Redfox back in school." That got his son to be quiet. Igneel has been working rather hard lately that he couldn't hold back a large yawn. "Oh man. I'm ready to hit the hay."

"But you haven't eaten yet." Natsu said.

"Good call." Igneel said. "Can you do me a favor and make sure everything in here is off? After I eat and relax some, I just might fall asleep."

"Sure, Dad." Natsu said as he let him go. Natsu roamed around his father's huge lab to do what his father asked him to do. It took a moment before Natsu suddenly heard a large explosion coming from the lab and saw that Nebula has infiltrated the lab.

"Time to cause some damage." Nebula claimed as it was her favorite thing. She started smashing and blasting everything in her sight. Natsu, staying hidden, saw what was going on and had to do something.

"No one comes all the way to my father's lab just to wreck it." Natsu said as he willingly transformed with him now wearing a black and red skin-tight suit with him wearing a gold belt with a D on it, gold gloves and boots, and the mask looking like the face of a dragon. As Nebula continued to destroy everything in the lab, Dragon came out of hiding and flew right at her. With one powerful strike, he caused her to stop destroying and her to slide against the ground.

"I believe you're lost. This isn't a place for crazy people." Dragon said.

"Don't you know you never hit a lady?" Nebula said.

"You look hot, but too crazy. I think there's an exception." Dragon said.

"In that case..." Nebula said and swung her leg up to kick him right under the chin. She didn't stop there as she smashed her foot against his gut and knocked him back. "This is going to be fun."

"You asked for it." Dragon said. Nebula fired laser beams from her eyes, but Dragon jumped up and avoided it. After that, he bounced around to build momentum until he came right at her and smashed against her with her hitting the wall.

"You're asking for it." Nebula said as she jumped off the wall and attacked him some more with powerful strike. The two of them kept fighting each other as they fired beams from their eyes. The beams collided and caused a large explosion that blew both of them back and smashed against the walls. "That's it. It's one thing when I hurt someone, but when someone hurts me... The gloves come off."

"Bring it." Dragon said. From there, the two of them charged at each other. The two of them kept smashing against each other with their fists, trying to hurt the other. Their powers were about the same. They were an even match for each other. It's just one big stalemate. As the two of them kept fighting each other, Dragon managed to land a strike against her with her smashing against the tank that contains the pheromones Natsu's father has been experimenting on. Without thinking, Dragon just flew right at her and tried attacking again.

"Time to swim!" Nebula said as she flew to the top of the tank. When Dragon came at her, she grabbed a hold of him and tried to hold his head down in the tank to try and drown him. Nebula held him down there, but Dragon was able to grab a hold of her and threw her in. They both fell in and kept hitting each other. Then, they pushed against the other and were unleashing tremendous amounts of energy. The energy collided against each other until it caused an explosion and the tank completely shattered with the pheromones spilling everywhere. It washed over the lab with those two being completely exposed to it. When those two were washed into the lab, their costumes were all torn up.

"Oh... My head... What happened? Where am I?" It sounded like Nebula was Lucy once again.

"I'm not done with you just yet." Natsu said as he tried to get up, but then the experimental pheromones kicked in on both of them. They were practically surrounded by it. Lucy's out fit was torn with her looking like she was wearing a shredded two piece bikini. Natsu's chest was mostly exposed with some other muscles revealed. When the two saw each other, something came over their bodies. They both felt like they were looking at the sexiest thing ever, almost glistening like a reflective surface from the other's body. They were suddenly feeling adrenaline running through them with their hearts beating faster. The two of them crawled closer to the other, feeling so...horny from the scent coming from the other.

"I'm Lucy."

"I'm Natsu." The two of them kept gazing at each other and even licked their lips with anticipation.

"I know this is crazy, but I suddenly feel like..." "Same here!" The two of them suddenly kissed each other passionately. Those two were going at each other hard and fierce with their tongues slobbering against the other. It only took mere moments for them to run out of breath and felt like they needed water, but they didn't care. Natsu used his enhanced speed and strength to lift Lucy up and pinned her to the wall with her having her legs around him. Once they were like that, they didn't slow down a bit as they ran their hands all over the other like their life depended on it.

"Oh my gosh, this is crazy." Lucy said as Natsu was planting fierce kisses around her neck and exposed skin. "How the hell is this happening?"

"Must be whatever my father is working, but I just don't care." Natsu said. Neither of them were thinking clearly. It's like they both had a primal desire to mate like wild animals. Natsu added to it as he threw open her top and fiercely gripped both of her breasts with his hands. With his enhanced strength, he squeezed them hard.

"Can't think clearly. This is crazy, but I don't care either!" Lucy claimed as she planted a big wet kiss on Natsu once again. Then, she slipped her hands down to try and get his pants to open up. Once she felt what he had in those pants, she felt like she really was with a superhero. Then, Natsu moved aside a piece of Lucy's clothing and suddenly thrusted himself against her. Lucy almost felt like he was going to go all the way through her. With most of their bodies exposed, hands on his head or her breasts, kissing each other with such intensity, and now Natsu practically impaling Lucy; the two of them stayed like that. They both felt like this was all they wanted to do at the moment. Natsu continued to power shove his pelvis against Lucy until she felt like her insides were going to explode. Even as they did, Lucy and Natsu didn't stop. They didn't try to hold the other back because they both felt like they could go on forever.

"I know my daughter is here, Igneel! Now where is she?!" Jude said as he and Igneel came walking into the lab.

"Why would your daughter be here? She isn't and you can see that..." Jude and Igneel walked in saw what their kids were doing. Seeing them like this, it disturbed the two of them so much that the two of them passed out. That certainly got their attention.

"Should we be concerned?" Lucy questioned.

"I know we should, but all I can think of is this." Natsu said as the two of them just kept doing what they were doing.

...

Later

"Oh... What a nightmare." Jude said as he and Igneel recovered and found themselves in an empty lab. "I had a horrible vision that my daughter was with your son, and they were... Eck! Seeing in little clothing is one thing when we're at the beach, but now..."

"I had the same disturbing vision. I haven't seen my son without his pants on since he was in diapers." Igneel said. "And what the hell happened to my lab?! Oh no! The experiments with the pheromones is destroyed. The formula is everywhere...and I feel perfectly fine!" He said as he and Jude were acting no different. "I guess the whole thing is either a dud or there's some variable I haven't quite thought of. Maybe the scent caused to pass out and hallucinate?"

"Of course. My daughter would never be caught dead with your son. On that note, where is she?" Jude questioned. What neither of them knew was that both of their children continued their session in Natsu's bedroom. The whole room was a complete mess with stains everywhere. In the end, the two of them were sleeping against each other in the nude, but they're certainly not complaining how about how it felt. They really did act like animals with each other. It's unreal how they went from fighting each other to mating with each other. Either way, they love it.