Kyoto, one of the most famous cities in the world. Once upon a time it was axis upon which the whole nation of Japan turned, its capitol. Even in modern times, though its political influence has waned, it is still held as the cultural center of Japan, the keystone of the nation. This fact none on the mundane side of the world can dispute.

For the supernatural community however, Kyoto still maintains its importance as a location of great power. Built upon numerous ley lines of natural and arcane power, shrines to various Kami and gods dot the landscape, each strategically built to channel and direct its energy. The Youkai of Japan have held stewardship of this city since time immemorial, maintaining it and ensuring its power never wavers and is never disrupted. For these reasons alone Kyoto could be considered one of the most unique locations in the world, which begs the question.

For what reason was the city built in such a manner?

The answer is lost to time, so much so that not even Yasaka, the current guardian Kyuubi of the city, knew the answer. All that was known was that it was her sacred duty to ensure that the mystical energies present continue to flow as they always had and to protect them with all her might when necessary.

Cao Cao, the wielder of the True Longinus and head of the Hero Faction of the Khaos Brigade, held no knowledge of this, nor would he have cared. A man, more like a boy, in his late teens, he wished to use the latent power of Kyoto in tandem with the Kyuubi he subjugated to tear a whole to the Dimensional Gap and call the True Red Dragon God Emperor, Great Red an entity said to be the strongest existence, to the city. All this was done in order for him to test the limits of what a "mere human" such as himself and his comrades could reach.

His plan was, shortsighted.

Issei Hyoudou, the current Sekiryuutei, the wielder of the Boosted Gear, one of the thirteen longious class Sacred Gears, was staring at the sky as a massive summoning circle appeared, a giant cracking echoing throughout the destroyed battlefield. He was battered and bruised, his red armor covered in cracks. He couldn't help but be gob smacked at what was occurring.

" W-what's going on?! I don't know what's happening!" he couldn't help but scream at the turn of events, hands gripping his brown hair.

First a bunch of molester spirits rose out of the ground and now a summoning circle? Wasn't he supposed to have unlocked his potential? Even his opponent Cao Cao, a black haired youth in traditional Chinese warrior clothing was shocked still at the turn of events.

"You are summoning the Oppai that only belong to you! With this your true potential will be unlocked!" The voice of Elsha echoed in his mind, the spirit of a previous wielder of Boosted Gear. With another loud CRACK echoing in the air a figure began to appear from the circle.

First the feet, then the legs, and the beginnings of long deep crimson hair. Descending from the circle was a beauty that has been captivating Issei since he had obtained the powers of a Devil and a Dragon. It was Rias! The woman he loves! And she's only in her bra and panties!

Blood immediately began to gush from Issei's nose at this vision perfection gently descending before him. It seems like he summoned her from her sleep! Her eyes darted open as she continued to descend, the loud cracking noises waking her.

"I-issei?! What's going on? This is Kyoto?!" Rias' surprised voice echoed across the battlefield.

"I don't know!" Issei yelled, hearing her question. He was just as confused as she was! Rias' lightly glowing body touching down in front of him.

Elsha's voice once again echoed in his mind, " She is the key to your potential. She is your switch. Poke her breasts and you will unlock your power!"

"Waahhhhhhh!" The crying sounds of Draig could be heard echoing from the jewel on the back of his Sacred Gear. The current situation just another hammer to his pride as a Heavenly Dragon.

Issei was staring at the jewel of his gauntlet, his face all of a sudden becoming very serious, "I understand."

He turned towards his crimson haired master, blood still leaking from his nose, and made his sincere request, "Buchou! Please let me poke your breasts!"

Rias' face immediately goes red from embarrassment and she instinctively crosses her arms across her chest protectively.

"I still don't know what's going on, but I think I understand," she looks away shyly and undoes her bra, freeing her captive breasts. They bounce once, twice when they release and seem to glow with a golden light.

"Please do it quickly this is embarrassing," Rias mumbles as she presents her chest to her Pawn. The power concentrating at her nipples.

"Thank you very much!" Issei thanks her, head bowed and hands in a prayer like position. He releases his gauntlets from his hands, leaving human arms bare, "I am going to poke them both now!"

With both his index fingers extended, Issei begins to move his hands towards the perfect oppai of his master, aiming for her nipples. The tips of his fingers gently made contact with the peaks of her mounds and Rias began to bite her lower lip from the sensation. Issei pressed in a bit more, his fingers becoming buried in her breasts. At this point Rias couldn't take it anymore and a gasp escaped her lungs.

"Nyaaaaan"

With that gasp a light pulsed from her chest and encompassed Issei. Another large CRACK could be heard echoing throughout the battlefield. Rias' body began to quickly rise again and disappeared through the summoning circle again, her role having been concluded.

"THUMP! CRACK" Issei could hear his heart thump in his chest as yet another cracking sound was heard. He began to explode with red draconic power.

Cao Cao could not believe what he was seeing, this had to be some sort of joke right? He knew he was fighting the so called "Oppai Dragon" whose love for breasts was quickly becoming renowned across numerous mythologies. But to summon his master from halfway across the country just to poke her chest, did he think this was some sort of joke?

As these thoughts were running through his head, he heard another "CRACK!" reverberate across the battlefield and his opponent exploded into a tower of red energy, stronger than any released previously in their fight. Winds generated from the from the outburst buffeted him as he lifted one of his arms to shield his eyes from the oncoming dust. When the air began to settle, he looked ahead and there was Issei, full Sekiryuutei armor gleaming looking good as new.

"Cao Cao! This time I'm going to wipe that smug look off your face!" Issei's roared at him from across the crater they were fighting in.

"Bring it on Sekiryuutei! No… Hyoudou Issei !" Cao Cao's replied back readying his spear, condescension dripping into his voice. He had been handedly winning in their battle up till now. Did he really think that poking a pair of breasts would change anything?

"Welsh Sonic Boost Knight!" Issei's voice rang out. Cao Cao's eyes barely had time to widen as his opponents armor all of a sudden slimmed down into a new sleek form and appeared directly in front of him.

"Welsh Draconic Rook!" Again his voice rang out. Cao Cao could barely get the shaft of his spear up in time as Issei's armor changed again. This time becoming much bulkier than usual as the punch connected with his longious, launching him clear across the battlefield. The power behind that punch was on a completely different level than before!

"Welsh Blaster Bishop!" Hyoudou's form changed once again. This time into a form more akin to his regular Balance Breaker with the addition of two giant cannons on his shoulders which immediately began to gather energy. If he allowed to himself to be hit by that he was done for!

"Take this Cao Cao! The power granted to me by my master's oppai! DRAGON BLASTER!" Twin beams of energy fired from the cannons, combining into one giant beam that destroyed anything in its path. The charge time however was enough for him to gather the power of his lance to try and redirect the blast hurtling towards him.

"HAAAAAAAAAAAAAAAAAAAA!" With a scream effort and Holy power Cao Cao put everything he could into counteracting the force working against him. He wouldn't allow himself to go down like this! The two opposing powers collided in an explosion of energy. Dust kicking up and shrouding everyone's vision.

"BOOM! CRACK! CRACK!"

The sound of the explosion and cracking reverberated through the air. Cao Cao managed to survive the attack, although his clothes were tattered and he had blood leaking from the corner of his mouth.

"To think, had this much power, it's almost like an illegal move" Cao Cao panted, admiration beginning to seep into his voice.

His opponent was similarly panting, it seems that the attack took a toll on him as well.

"Yeah, combining the powers of Knight, Rook, and Bishop. Illegal Move Triaina!" Issei responded, deciding on the name right there. He dropped to one knee in seemingly exhausted.

As they basked in the aftermath of the collision of attacks another voice rang across the battlefield.

"Cao Cao! Something is happening to the rift!" Georg's voice was tinged with panic. He was the magician of the Hero Faction, possessor of the Longinus Sacred Gear Dimension Lost, capable of creating whole dimensions such as the one they were fighting in. It was his job to direct the powers of Yasaka and open the rift to the Dimensional Gap in an attempt to attract Great Red's attention. It seemed that the most recent output of power had caused a disruption in the energies they were channeling.

Then the deafening sound of shattering glass was heard by all.

Deep within the earth beneath Kyoto, an entity slumbered. It had been there since time immemorial, kept in place due to the combined natural energies of the city above. It did not know how long it had been locked away, only that time held no meaning in the space it occupied. And so it slept, allowing the long years to pass it by with little attention.

It could sense the energies of those who lived above it easily enough and the times it did wake it would observe the progress of the world above. There were times when it could feel its prison jostled due to the activity of people above, especially in recent years as the city overhead expanded. However its confinement remained absolute, the warden of its jail maintaining the flow of power that held it in place.

This time however, was different. It's jailor was distracted from it's duties and there was a great battle occurring overhead, one in which a great many kinds of energy were being wielded. The flow of power was being disrupted and there had never been a better chance than now for it to break free.

So it began to flex it's long unused power and with each flex a crack reverberated through it's cage.

"Just a little bit more"

Then it felt it's chance, a great collision of power and a tear in the fabric of the reality above. With a great heave of exertion it flexed it's energy as much as it could and it could both feel and hear it's prison crumble around it.

It was finally free.

On the surface the earth began to shake, thunder struck all around the battlefield, and pure power filled the air.

Issei was panicking, Triania had left him exhausted and this new development was frightening. He couldn't defend himself from whatever was causing the events he was seeing.

"W-what did you do Cao Cao!?" Issei screamed to the opponent across from him, who had a similarly panicked look on his face.

"This isn't me! The rift should've only attracted Great Red here, not whatever… THIS is"

The ground between the two began crack, then glow and a pillar of yellow energy erupted between them. They both shielded their eyes from the intense light, it was nearly blinding. The beam began to weaken becoming smaller and thinner until a humanoid shape could be seen in the center. Finally the light disappeared and in it's place was a man.

First thing of note was the shock of shaggy blonde hair on the man's head, its color similar to the light that he had appeared from. He wasn't very tall, standing at a little under 6' but his presence was so imposing that he seemed to dwarf those around him. His face was tanned, with three whisker like marks on his cheeks and crystal blue eyes that seemed to sparkle with their own light. His outfit comprised of an orange shirt with black stripes around the hem, black pants and sandals, and a white cloak draped across his shoulders with red flames along the bottom. His mouth opened as he uttered his first sound since his sudden appearance.

"YAWWNNNN!" He let loose one of the largest yawns either youth had ever heard. Small teardrops appeared around his eyes as he closed them and brought one hand up to cover his mouth. And just like that the shock of his appearance was shattered.

"Man, it feels good to be up and about again! You have no idea how cramped it got in there" he said while beginning to stretch, looking for all the world like he had just gotten out of bed.

"Thanks for the help by the way. Never would have been able to do this without you guys" he continued scratching the back of his head and giving Issei and Cao Cao a thumbs up. He had a huge grin on his face, eyes squinting, his white teeth seeming to sparkle from his slightly pronounced canines.

That seemed to be enough to break the spell on Cao Cao as he immediately readied his spear towards the blonde.

"Who are you. Name yourself!" Cao Cao demanded, on edge from the figure's appearance.

The blonde cocked is head to the side at the aggressive action in apparent confusion and pointed towards his own face.

"Me? I'm Uzumaki Naruto! Greatest Hokage whoever lived!" He responded boisterously. Pride seeping into his voice. At the total lack of recognition on the youth's face however, he deflated, crossing his arms in an almost grumpy gesture. "I guess that doesn't mean much to you though. It HAS been a long time after all."

Cao Cao was unmoved by the carefree attitude, he recalled the power that accompanied this being, Naruto's, entrance. He was not an existence to be taken lightly and from the sounds of it he was OLD. And there was nothing that inspired fear more than an ancient being of the power that was displayed.

"State your purpose here or I'll be forced to defend myself." Cao Cao warned as he began to gather the holy energies to his spear. No matter what the being before him was here for, he had faith in the power of his spear to protect him should he need to. Even the strongest existences were still wary of the power of the True Longinus.

Naruto's eyes narrowed at the aggressive act. His jovial attitude disappearing as the holy power gathered as a means to threaten him.

"Well that's not very polite." Naruto muttered as he disappeared from view. The very next instant he appeared in front of Cao Cao and brushed aside his spear, the holy energies doing little to hinder him. An open palm strike collided with the youth's chest and launched him across the battlefield like a rag doll. He rolled to a stop on his chest 30 feet away from where he was standing, gasping for breath as an intense pain burned in his chest.

Seeing their leader dispatched so easily the remaining members of the Hero Faction immediately leapt to his side.

"We need to leave now! This isn't going as planned. The experiment is over." The magician Georg said while placing Cao Cao's arms over his shoulder.

Panting and in pain Cao Cao replied, " Yeah, this experiment turned out to be a failure. We need to fall back and regroup. We'll try something else," he turned his attention to the blonde, who was allowing this to happen with not a care in the world, "I still don't know who you are. But it won't be so easy for you next time." His piece said, a magical circle appeared around the Hero's as they began teleporting away.

Naruto only grinned in response, a sense of danger tinged his look, "Looking forward to it," as the group of humans disappeared in a flash of light.

With their retreat the scenery began to dissipate, as the one who created the dimension was no longer present. Soon they were back in the unruined city of Kyoto, no signs of any conflict having taken place.

With the threat gone, Naruto turned his attention to the still shocked Issei, who was still trying to process what he had seen.

"And who might you be?"

Hello all! This is just a little plot bunny that has been circling around my head for the past few days and I just HAD to write it down. No beta or proofreading, just pure unfiltered plot idea.

Recently went down the rabbit hole that is Highschool DxD, read all 30 light novels and just really wanted to see a a Naruto Xover that didn't just replace Issei with Naruto. I feel like it does a disservice to Ishibumi's work and the series as a whole loses something without Issei being a prominent figure, in all his Oppai Dragon glory.

I believe I still have at least 1 or 2 chapters of inspiration left in me to continue this. May do more if the inspiration strikes but I haven't really planned that far ahead. If anyone feels inspired to do their own spin or assist let me know! I'll be happy to share my nonsensical ramblings with someone who can keep me motivated.

Like and review and give me any critiques you may have! It's been a while and my writing is definitely rusty

Feara