Rise of the Dragon Oni[High School DxD/Futa!Ibuki!SI] – Chapter 1

Summary: SI is reincarnated into the world of DxD, but while waiting to be born, an incidents happens that lead them to become the a new incarnation of the Dragon God, Yamata-no-Orochi.

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"Of course, this happens; everything just has to go wrong," Mizuki Shiranui, heir to the Mizuki Clan, who had for centuries served Japan as its protectors, complained as

And right now, she was caressing her pregnant stomach as she looked across the beach that she had washed ashore upon.

She had meant to travel to her husband's island so that she could give birth amongst that side of the family, but as they had been sailing on the sea.

They had been accosted by some delinquent teens calling themselves the Hero Faction, with their stated purpose being to fight against the Supernatural that was taking advantage of humanity.

And she had laughed them off and said no, for a while the average human is not as strong as the average member of a physical species.

It was clear to Shiranui that humanity had long since won the war, as the planet belonged to them.

And what they were seeking to do was going to ruin that.

But the brat who had taken the name of Cao Cao had not taken that well and so had attacked.

Which had resulted in the destruction of their ship and her current situation. And also the death of her husband as she watched him be impaled by the boy's spear, resulting in it only grazing her.

"Now let's hope that something didn't happen to you," Shiranui said as she caressed her stomach where her child was sleeping. "Now, where am I? I must have been blasted quite far because I do not remember an island with a mountain that big anywhere near us."

As she looked ahead, Shiranui could see a mountain reaching up into the skies, the terrain rocky and almost looking unclimbable.

But she had to move from her current position, even as pain wracked her body, and as she continued to move, Shiranui knew that something was wrong with her. She could feel something spreading through her body. She looked at the place where she had been grazed by that Holy Spear Cao Cao had been wielding.

Light poisoning. Shiranui realized, but she had no way to deal with it and... "Oh no." She muttered in fear as it clicked in her head that if she was poisoned, that meant that her baby would also be poisoned as the sick Light spread through her body, as it, at its master's behest, sought to extinguish her life.

"No, no, no, no!" Shiranui cried as she realized that her baby would now eventually perish. She didn't care about her own life, but her baby's? That was more important than anything else now that her beloved was no longer here. "Damn you, Cao Cao, you are the monster of this world, not any Kami, Youkai, or even Oni." She cursed, and then her vision started to swim. "No, no, my baby…" Shiranui muttered as she collapsed.

Though, as her vision started to blur, she heard the sound of voices.

And Shiranui forced herself to speak. "Please, save my baby…"

Xxx

A sub-trope of the Isekai genre was when you were reborn, you had somehow had full consciousness even while in the womb as soon as the brain was made so that you could do womb training.

And I had thought that was kinda fucking stupid, as no baby brain should be able to handle the mind of a full adult or have the energy to do so.

But the joke was on me, I guess, as that was exactly what had happened to me. And I was currently in the darkness of my Mother's womb.

And fuck, it was boring.

But thankfully, whatever anime world I had been reborn into had some sort of supernatural power as through meditation I had discovered a form of energy within myself, and it was probably a form of ki or something.

And so, with nothing better to do, I started cultivating circulating the energy throughout my unborn body when I was not sleeping.

And I just did that as I felt my body continue to grow, and I managed to be a bit more aware of my surrounding outside of my Mother's womb as I learned how to sense the presence, well, the Aura of other living beings, and also the emotions it seemed like.

And that was how I knew that something terrible had happened to my Mother, as I felt a very powerful Aura appear before her and the person I assumed to be my Father. As I couldn't really understand what they were saying as it was clear they were speaking Japanese.

And then my Father's Aura vanished and suddenly I could tell my Mother was moving at very fast speeds.

And then she came to a stop.

So yeah, I could tell something bad was happening as I could feel my Mother's distress, concern, sadness, and also love.

Love for me.

And…

Something was wrong.

I could feel it.

Something bad had entered the body of my Mother and was now trying to make its way into my own, and I quickly gathered up what I still presumed to be Ki and started to push it out into my and her body to try and purge whatever it was…

And it was Light, a purging Light that was filled with malice as it sought to fulfill its duty of killing my Mother. I ignored all the small Auras that now surrounded us as I focused on trying to save my Mother.

I would not let the woman who loved me so much die. And then poisonous light halted as I felt an immense Aura that now surrounded me, greater than even the one that had attacked us, much greater.

Well, this is interesting.

Who is this? I thought as a voice spoke directly into my head.

I did not expect an adult soul to present within this child, and as for who I am reincarnator from Another World beyond the defense of Great Red. I am Yamata-no-Orochi.

Great Red… fuck, I was in DxD. And why is the great Dragon God of Japan speaking to me? Actually, I thought you perished at the hands of Susanoo?

I was slain at the hands of that damn bitch, but my spirit persisted even after the destruction of my body and seven of my eight tails gaining lives of their own.

The usage of bitch to refer to Susanoo was a bit sus, but I focused on the Dragon God that was currently talking to me.

As for why I am going out of my way to speak with you… see, you and your Mother have washed up on the shores of my Onigashima and were found by the Oni who worship my Sealed Spirit. And so they thought someone who carries the blood of Susanoo would be a worthy vessel to revive me into, after all the previous ones failed.

… and they were right.

So you are going to take over my body now? I asked, feeling a sense of resignation as there was no way I could defend my soul against even a weakened god. Can you at least save my Mother?

…Reincarnator, you would plead for the life of the women who you do know, yet not your own?

Yes. I answered, as much as it would suck to die again, I had already done so. I would only have one Mother in this life, but she could have many children after I perished. My life in exchange for hers… I won't resist.

Hah! Yamata-no-Orochi laughed, his Aura shaking as he did. What a dutiful child you are; it would be a shame to see such a thing go. Very well, child, I have decided to make you mine; you shall now be a child of me, a new incarnation of myself, and you shall inherit my power and titles. Now be born my daughter, your name shall be Yamata-no-Ibuki, Dragon God, God of Oni, Queen of Onigashima, Child of Orochi and Mizuki Shiranui, Grandchild of Izanami-no-Mikoto and Ophis, the Dragon God of Infinity. Decendent of Susanoo-no-Mikoto.

You are Yamata-no-Orochi.

Wait what? I thought as I suddenly felt power flow into my body, power and knowledge, and I could feel my body starting to grow. Why? I asked.

Kid, I have been sealed within this mountain for over two millennia, and that gives you time to think.

And I realized that I want a Legacy in this world that is just not my living tails.

So be reborn into a body that befits your new godhood and adult mind. For that world you come from has excellent taste, I would smash that would be a child of mine so hard. Now you get to do the smashing, my daughter, lots of Oni willing to spread their legs for their new god. Orochi perfectly chuckled and I felt the poisonous light be banished from Mother's body as I saw light.

Thank you… Father. Was all I could really think as I was born into a very degenerate world of Angels, Devils, Dragons, and other Mythologies.

Xxx

"Ahh, my baby is coming out; I am giving birth in front of a crowd of Oni," The Kunoichi that had washed ashore on the Island of Onigashima moaned as she gave a pleasure-filled birth. Milk gushed from those rather delicious nipples of hers.

Yamata-no-Orochimaru, the one designated as the fifth child of the Great Orochi, just smiled as finally, after literal centuries of attempting this Ritual to give her Father, their god, a new body had finally born fruit.

The combination of an unborn child and the body that bore the lineage of the one that sealed him away seemed to do the trick, and now Father would cease to be a lowly Divine Spirit and be a god of flesh and blood once more. She knew it had been a success as she had felt the Divine Core of her Father transfer which had resulted in the rapid growth of the body going by how the human's stomach increased in size.

The Serpent Oni smiled as she saw horns emerge from the gushing pussy lips of the woman, which was followed by surprisingly teal and pink hair, though that didn't really matter as none of the tails really had a uniform hair color or scheme.

The rest of the head followed, and Orochimaru could see that the gender of the baby may have had an effect as that was clearly a girl's face, but she and the other tails had been born as three females, three futas and one male.

So perhaps Father had been a Futa, when they had been alive? Well, there was no way to know as they had never assumed a form that could be considered humanoid.

Though it was interesting to see that this body of Father's had a grey-purple skin tone similar to that of Alice.

Soon enough, the rest of the body followed, and she saw she was bipedal but had a tail growing out from her back, and now that her crotch was visible. Orochmira could see that the body of their Father would be a futa, going by the already b-cup breasts, and three-inch cock she was sporting.

She watched the singular male tail, Yamata-no-Sukuna, the eight-tail, take hold of their Father's still infant body, but she wondered how fast that would last.

"Behold!" Sukuna said as he held out their infant father for all to see. "Yamato-no-Orochi has returned to us in a new body; our god is once again amongst the living."

And all the gathered Oni shouted in happiness, all of them having joy on their face as they beheld their god.

And Orochimaru knew that no matter the gender, all the Ony that were currently here were thinking the same thing.

The most beautiful creature they had seen in their life… and probably also the sexiest, kukukuku. Orochimaru mentally added to the thought as she felt a tingle in her crotch as she fantasized about Father pressing her fully adult body into her own.

But then something she had not expected happened, as both she and Sukuna had thought the revival ritual had taken too much out of them for Father spoke.

"Silence." The voice of the Great God Orochi said, and the entire mountain, no, the entire island went quiet for the first time in two millennia. "I, Yamata-no-Orochi, have incarnated into a new form and body, for I could not continue as my old self."

And Orochimaru understood, that Father could not actually be revived like that, the seal the rules were too strong. To the universe, Yamata-no-Orochi was beyond Revival, but not reincarnation, so while he essentially gave birth to himself using the Kunoicihi and was something closer to her and the other tails, but managed to inherit the Divine Core of the Serpent God.

Something they could not.

As they had tried with themselves countless times to become a vessel of Revival for Father.

"And so I am now my own daughter; I am Yamata-no-Ibuki," The name was spoken, and they could all feel the divine power emanating as a downward force.

Making it so that there was no way to deny that she was their god.

"The Dragon God, The God of Oni, Queen of Onigashima."

Authority was asserted and Orochimaru could tell that the sub-dimension that Onigashima was in now was under Father's full control.

"Now take me and the woman that birthed my vessel to a chamber; my body still needs to grow and is in need of nourishment," She ordered.

"Yes, Father, understood," Sukuna said as he went and carried her to bed chambers that had been prepared and maintained for Father for centuries.

The human was picked up by one of the Red Oni guards that Orochimaru didn't know the name of, she didn't really bother to know the name of most of the Oni that lived on Onigashima.

But one thing Orochimaru did know was that their lives were about to change forever.

Xxx

A small moan escaped Shiranui's mouth as her eyes fluttered open, and immediately, her body was on full alert.

As because everything about her body was wrong from the last time she had woken up, the weight in her stomach was gone, and her breasts were lighter.

And then the memories of what happened crashed right into her mind.

The boat.

Cao Cao.

The poison.

The birth.

"Yuki!" She shouted as she sat up in the… bed? That she had been laying in and… it was a rather massive bedroom she was currently in, on a bed that could fit several people on it with it being wider rather than long.

That could wait for later; right now, she needed to find her baby, save her baby from these delusional Oni, honestly thinking that her Yukikaze was Orochi revived?

Foolish and utterly stupid.

She removed the covers and then realized that she was entirely naked.

And that was when the massive doors to the bedroom slid open, and in walked a three-meter tall, purple-skinned oni wearing a sweater that was stretched out by a massive pair of breasts, larger than even hers would be if she were the same size.

A pair of baggy pants still had a visible bulge despite the room given.

And then she spoke a word that broke Shiranui's brain.

"Glad to see that you are awake, Mommy."

Xxx

Within the highest realm of Takamagahara sat the Pot of Creation, the item used by Izanagi and Izanami to raise the land that was now known as Japan from the sea, and with it in this realm that connected Takamagahara where the Amatsukami resided, and the Ame the section of Chaos that belonged to the Kotoamatsukami sat Izanagi-no-Mikoto.

The stirred the Pot of Creation, raising from it wonderful creations that could sadly never leave this Forge that served as one of the connecting tissues to Chaos from Earth. Because it was only with his other half that these things could truly exist on Tsuchi.

But one of the things that he had made over the years was a divine family tree that continuously updated itself as his lineage had become quite large, and two thousand years ago, he had decided to keep himself up to date on those that shared a direct lineage to him and Izanami.

But in recent years, the updates barely happened as mortals with even a sliver of Divine Essence either died or it was fully bred out.

So he was quite surprised to see a line spread itself from Orochi down to the last clan that carried his Susanoo's blood.

"Yamata-no-Ibuki," The creator deity spoke. "What did you go and do now you old snake."

Xxx

A/N: This fic is inspired by Karmatic's a new sun, but this one much more lewd as it will lots of futa fucking.