Chapter 19

Disclaimer: I do not own High school DxD or Fairy Tail they are property of Ichiei Ishibumi and Hiro Masima respectively.

"What do you mean your home I thought you lived at the Gremory home in the human world?" Serafall asked Natsu as he introduced this place they were in as his home.

"Did you say this was the Dragon Realm?" Sirzechs asked in amazement.

"Yes, this is my home the Dragon Realm. I only recently moved in with Wendy and Rias," Natsu answered the two questions.

"Are you trying to say you lived here in the Dragon Realm?" Serafall asked.

"Let me introduce myself properly. Etherious Natsu Dragneel, the one True Dragon King, ruler of the dragon realm and last etherious demon at your service," Natsu introduced himself with his full title.

"Wait you are the Dragon King I don't believe you, I know all five of the Dragon Kings and most certainly aren't one of them," Serafall said not believing Natsu.

"You guys should really correct your history," Natsu said.

"What is an etherious demon?" Sona asked.

"I'll tell you after I beat up your sister," Natsu said with a big smile.

"I'm really getting annoyed with your attitude so let's get this duel started already," Serafall said with an annoyed expression.

"All right just follow me to the clearing we will be using for our duel," Natsu said and started making his way towards the clearing next to the lake.

As they reached the clearing Natsu and Serafall stood across from one another while the rest of the crowd stood some way off in order not to get caught up in the fighting.

"As an apology for antagonising you so much I will give you some advice. Don't even try using fire magic since it has no effect on me, heh it will just make me stronger in all honesty that is if your fire would be strong enough," Natsu said.

"So you're a fire magic user mister Dragon King?" Serafall said.

"Yes I do use a certain forms of fire magic," Natsu answered all be it vaguely.

"Then this win is mine I have defeated opponents with the strongest fire magic imaginable with ease, and I have beaten some of the Dragon Kings," Serafall gloated.

"If that is the case then I will give you the first hit and I won't do anything to block or dodge," Natsu said while standing in a relaxed position.

Serafall was overconfident in her power and did not believe Natsu was the Dragon King and used one of her basic attacks. She formed a massive spear made of ice and threw it at Natsu. Natsu true to his word just stood there and waited for the attack. As the ice spear neared hit steam started to rise out from it. When it finally reached Natsu the spear had almost completely evaporated. The once massive spear that was the size of an adult man was now just the size of a child's arm that harmlessly bounced off Natsu's body.

"I thought you said you weren't going to do anything to dodge or defend. Did you get scared when you saw the power behind my attack?" Serafall asked in a cocky tone thinking that Natsu used his magic to evaporate her attack.

"I didn't use any magic it's just that I relaxed the hold I keep on my aura. Due to my magic my aura heats up the area around me quite a bit so if I don't keep it under wraps around others they will get quite uncomfortable," Natsu explained.

Serafall wanted to say that he lied but she could not detect any attempt at deceit from him and she didn't detect him using any spells.

"Now that you had your attack it's my turn," Natsu said with a devious grin.

Natsu's fists exploded in crimson fire as he charged at Serafall with inhuman speed. Caught off guard by his speed Serafall was unable to dodge the attack and she was struck in her stomach. As she doubled over on Natsu's fist he planted his crimson fire covered knee into her face sending her flying back.

"You have some impressive speed there I'll give you that," Serafall said as she recovered.

The two started exchanging blows for the next minute before Serafall began to realise that this wasn't going anywhere and this supposed Dragon King was keeping up with all her attacks and matching her power.

Serafall decided to reinforce her ice with her magic so that it won't melt since the all of her other attacks would either have no effect on her opponent or it would evaporate before it came in contact with him.

"You are a lot stronger than I thought and your fire seems to be melting all my attacks which is quite a remarkable feat for fire since only the fire from one of the Dragon Kings has ever managed to melt my ice one I reinforced it. Mind telling me what fire you are using?" Serafall asked.

"Well this crimson fire I use is a refined form of regular dragon fire. I have some other forms but I will hold off on telling you about them right now," Natsu replied.

Serafall realised that she would have to use even more magic if she wanted to gain any ground in this battle. She started attacking Natsu with massive attacks but Natsu and his crimson fire just kept on matching her attacks and power.

Natsu was enjoying the battle quite a lot and decided to award Serafall.

"I have to commend you for the fun battle. Now let me show you another form of my fire," Natsu said as the fire around him started flaring up and changing colour. The crimson red fire was now merged with black flames.

"Black fire, now this is new to me," Serafall said surprised.

"You are too young to remember these flames that once struck fear in the hearts of devils and angels alike," Natsu said gaining an ominous tone in his voice.

"I am too young? Just how old are…" Serafall's question was interrupted by a vortex of fire that came out of Natsu's mouth similar to when a dragon would breathe fire.

The vortex completely consumed Serafall. Natsu quickly cut of the attack when he realised that he might have overdone the attack in his excitement. Once the vortex dissipated around its target Serafall looked quite burned up.

"Now you have done it," Serafall raged and started to case her strongest and signature technique, Celsius Cross Trigger. The entire clearing started to become a frozen wasteland but for some reason Serafall couldn't fathom nothing outside the clearing was affected.

"This is amazing," Natsu exclaimed in wonder at the powerful technique that managed to freeze the ground at his feet.

"W-What why aren't you frozen and why isn't anything outside the clearing affected?" Serafall asked astounded that Natsu and the surrounding forest and lake wasn't affected.

"It wasn't the easiest thing but I managed to counter the freezing part of your attack on myself and I blocked off the rest of the area from the effect of the spell," Natsu said as he smiled.

"That's impossible that was my strongest technique," Serafall's eyes were wide in astonishment.

"I think you deserve a reward for showing me your most powerful technique then," Natsu's smile grew to a grin that could only be describes as evil.

A massive ball of crimson red and black flames surrounded the two combatants. From the spectators point of view they couldn't see or even sense anything that was going on inside the sphere of fire.

"Not many people get to see this form," Natsu's voice could be heard from everywhere inside the sphere while on the outside the only thing that could be heard was the roaring of the flames.

The ORC members had a concerning feeling of déjà vu at seeing the ball of flames but they couldn't remember exactly why.

A loud draconic roar could then be heard from inside the sphere as it turned from the crimson red and black flames to golden ones and Wendy, Akeno and Issei dropped to their knees.

"What the hell is he thinking?" Rias screamed now remembering the fate that Kokabiel faced the last time they saw the golden fire.

"What are you talking about?" Sirzechs asked with concern in his eyes.

"Last time we saw these golden flames Natsu used something called 'Devine Punishment of the Dragon King' and it erased Kokabiel's existence. We have to stop him before he does the same to Serafall," Rias shouted in fear.

"That is not what is going on here," the voice of Ddrag could be heard coming from Issei's arm.

"How can you be so sure?" Rias shouted still scared for Serafall while the people that weren't present during Kokabiel's demise slowly processed what rias just said.

"The Dragon King will not kill this girl because she hasn't done anything to harm him or those he cares for," Ddrag explained calming the group down a bit.

"Natsu won't kill or even seriously hurt her," Akeno defended her loved one.

"I believe what Akeno said is true, didn't you see that Natsu cut his breath attack short?" Grayfia added.

"Now that you mention it he never exceeded Serafall's power," Sirzechs said knowing that Natsu had not yet reached the peak of his power.

"Are you sure he won't hurt her?" Sona asked Akeno fearing for her sister's health.

"I know for a fact he won't hurt her unnecessarily or excessively," Akeno assure the worried sister.

"Yes, Natsu will never hurt someone without good reason," Wendy added.

While this was going on Serafall opened her eyes to see a massive red dragon standing in all of its majesty in front of her. She felt compelled to show the utmost respect for this creature.

"This is the true form of the Dragon King," the dragon said in a deep voice that sounded a little bit like Natsu's.

"N-Natsu?" Serafall asked.

"Indeed, this is my dragon from but do not be afraid I will not harm you," Natsu said.

"W-Who said I was afraid? I can still beat you. I will never give up," Serafall tried to keep a brave face not willing to give up as she charged at Natsu with a battle cry.

"So this is the path you have chosen?" Natsu said in a softer voice.

A terrifying aura erupted from the dragon that caused the ground to shatter and the rubble to start floating in the air. Serafall tried to push on but after a few steps her legs started shaking and she only managed to take two more steps forward before she fell to the ground shaking in fear.

Outside the miniature sun the spectators could see the ground shatter around the ball of fire and the levitating rubble. They also felt the oppressive aura and they too felt fear in the face of this power.

"I give up, you win," Serafall admitted defeat in a shaky voice with a few tears running down her cheeks.

Natsu reverted to his human form and the oppressive aura along with the miniature sun disappeared.

The spectators were relieved to see that both Natsu and Serafall appear once the fire dissipated. Their relief was short lived when they saw thee utter fear and tears on Serafall's face.

"What happened?" Rias shouted in concern.

"Serafall are you all right?" Sona called out to her sister while running to her but before she could run more than a few paces Natsu appeared in front of Serafall.

"Natsu no stop," Sona and Rias both called out fearing that he will continue the battle.

Natsu however kneeled down in front of Serafall and gave her a warm and comforting hug. This unexpected action threw Rias and Sona off while Grayfia, Wendy and Xenovia had smiles on their faces knowing that Natsu would not harm her.

"Fear is not something evil, fear tells us what we are capable of, it tells us what we need to work on and drives us to improve," Natsu softly told Serafall while holding her tight.

Serafall began to calm down and felt comfortable and warm in Natsu's embrace and returned the hug.

"Feeling better?" Natsu asked with a soft smile as he pulled away and wiped her tears away.

Serafall gave a small nod and pulled him back into another hug. She then realised they had an audience and quickly released Natsu with a blush on her face.

Seeing that Serafall was all right the spectators relaxed. Akeno gave Natsu a big hug and a peck on the cheek congratulating him on his win followed by Wendy also giving him a congratulatory hug. Rias and Sona started berating Natsu for taking the fight too far but to their surprise Serafall stopped them and in a rare display of maturity said that Natsu taught her a lesson she needed to learn.

"What is this lesson you needed to learn?" Grayfia asked.

"That even though I am a Satan that there are still thing out there that are much stronger than I am and not to let my power and status go to my head," Serafall said.

"Sorry for being so rude Na-tan," Serafall said with her childish nature showing in the guilty look she had.

"There is nothing to be sorry for Sera, that was the most fun I had in ages," Natsu replied with a childlike grin and giving Serafall her own nickname.

"That was awesome the way you transformed into a giant dragon'" Serafall told Natsu in childlike wonder.

"I'm awesome right," Natsu smiled. The two of them exchanged compliments like this for the entire walk to the palace while acting like two young children.

Once they reached the palace Natsu and Grayfia went to the kitchen to prepare food with Grayfia insisting that she will not allow Natsu to do this on his own. The rest of the party followed Eossinth, who had greeted them at the main entrance, to the dining hall. They all talked for a bit avoiding the fight that just occurred with the ORC members getting to know Serafall and vice versa.

With Natsu and Grayfia they were working together in quiet harmony while preparing the food but something was occupying Grayfia's mind but she couldn't find the word necessary to start up a conversation.

"I can see you want to talk about something Grayfia. It's been bothering you since we started making the food and don't tell me I am mistaken. You are acting all distracted like your attention isn't on the food at all since you are currently trying to cut up a wooden bowl to add to the salad," Natsu said while looking at Grayfia with concern.

Grayfia seeing no way out of this sighed and turned to look Natsu in the eyes. For a moment she was lost in his onyx orbs until he snapped her out of it by placing a comforting hand on her shoulder and giving her a warm smile.

"Feel free to say anything" Natsu said.

Grayfia took a deep breath and steeled her nerves.

I must be some sort of evil maniacal person to leave you guys with this. But that is where I am going to end Chapter 19. I might not be able to update as frequently anymore since my classes starts today but rest assure I will not abandon my stories and I will try my best to at least release two chapters of 'A kind devil's guardian' per week. My other story will be updated as I finish those chapters but since I am writing at least double the word count per chapter there compared to this one the updates there will probably only be one per week. Andy just another question do you want titles for the chapters? Or are you guys happy with just the generic 'chapter #'. Anyway with that out of the way I hope you enjoyed and see ya next time.