Author's Note: Yeah, I'm back here again. This time it was a High School DxD plot bunny that jumped me, especially after I read a truly masterful fanfiction on here called Devil Ninja that crosses over DxD and Naruto. It actually pulls it off pretty freaking well. That said, I hope you all enjoy this plot bunny as well, and let me know whether I should make this into a fic or not. Enjoy!

Summary: Ophis has come to the conclusion that the best way to defeat Great Red… is to have a child. Eighteen years later, a new student has appeared at Kuoh Academy. A student who goes by the name of Deiru Ouroboros. How will his presence affect the DxD world? We shall see.

High School DxD: Infinite Legacy

Venice, Italy, 19 Years before the Beginning of the Series

Sitting at a café by one of Venice's many rivers, surrounded by humans, was a very different individual. This individual had the appearance of a girl who couldn't have been any older than 10 years old, and was short enough that she was able to swing her legs back and forth as she sat in her chair. Her large eye were neutral gray and her hair was black as night, as well as long enough that it reached down to her hips. Hidden by her hair, her ears had pointed tips, signifying that she was not human. Her outfit was that of a gothic Lolita.

This "young girl", as the humans who passed by her saw her as, was Ophis, the Infinite Dragon God and strongest dragon in existence.

Ophis sat at the café and watched the humans live their lives around her. Some were enjoying coffee and bread, others were talking amongst friends, there was even a young couple that were enjoying a gondola ride while look lovingly into each other's eyes. Indeed, the actions that human were able to take were many and varied in an iconic city such as this, and the general air seemed to be one of happiness and excitement.

She could not understand any of it.

Why did humans enjoy making such noise and acting with such energy? Perhaps, because their lives were so much shorter, they acted so much more energetically in their actions to compensate. Or maybe they were just naturally inclined to make so much noise. Depending on what they believed, humans were supposed to be descended from primates, after all. Then again, considering that Ophis desired silence above all else, that could be her own bias talking.

By now, you must be wondering why Ophis was even sitting there in the first place. Why would a being as powerful as the Ouroboros Dragon be sitting amongst humans when she desired to be amongst silence, much less at a place as noisy as a café? The answer, actually, was pretty simple. Ophis wasn't sitting amongst silence because she was unable to do so.

She actually had the perfect and most quiet place where Ophis could enjoy the silence she loved so much. The place was none other than the Dimensional Gap, the void between dimensions where the dragon goddess was born and lived for countless millennia. However, Ophis had, at one point in her life, left the Dimensional Gap behind and entered the rest of the dimensions.

When Ophis returned to her home, afterwards, she found that it had a new resident.

A massive and truly mighty dragon that went by the name of Great Red had taken up residence in her home, and refused to leave it after coming to a place that was perfect for him to cause all the chaos he wished without destroying entire continents. Seeing as Great Red was also known as the "Apocalypse Dragon", then it likely that such would indeed occur of he did his stunts anywhere else.

While having such freedom to act as he wished was good for Great Red, this left Ophis in a bind. Above all else was her desire to return to her home and reclaim that world of silence, but Great Red prevented her from that. And as much as she disliked it, neither she nor Great Red had the level of power needed to defeat one another. So, if Ophis was going to evict Great Red from the Dimensional Gap. How was Ophis going to get that kind of help? The answer to that was simple as well.

Ophis had decided that she was going to have a child.

Now, before this decision is balked at, let things be considered from Ophis's point of view. If she was going to gather enough powerful allies to defeat Great Red and force him from the Gap, then the forces that Ophis brought together needed to be exceptional in strength. From devils to angels to exceptional humans to other dragons, every person she brought together had to be strong and would help in her battle. And who would be more beneficial in a fight against Great Red than someone who shared her blood?

If Ophis were to have a child, than that child would receive her blood and all the power thereunto pertaining. Granted, that child would likely not reach the same level of power as herself, but he or she would still be a force to be reckoned with. And what more, if she could find a strong enough person to be the child's other parent, then that child would have the other parent's strength as well and truly become formidable. So, Ophis had come to the conclusion that the best way to defeat Great Red was to have a child.

But that in turn begged the next question: who should she have the child with? Tilting her head back and ignoring the humans around her, Ophis closed her eyes as she thought further.

First, the smartest choice would be to decide what race of being she wanted her child to be half of. Her own sense of bias immediately turned her thoughts towards it being another dragon, which would in turn allow her to have a child that was a pure-blooded dragon. However, that thought was discarded, as while her child would have 100% dragon's blood, the only two dragons she could consider "worthy" of siring her child her the Two Heavenly Dragons, which we both perpetually stuck in their Sacred Gears.

Next there were the Yokai to consider. It was not a bad suggestion, as having Yokai blood would enable her child to wield Youjutsu and even, to a lesser degree, Senjutsu. Being able to wield the power of nature itself was definitely a major bonus. Not only that, but each race of Yokai had their own unique abilities, from the Kitsune's control of fire to the enhanced reflexes and senses of Nekomata. Unfortunately, there existed very few Yokai left in the world, and none of them at that current point of time had the power she desired for her child. So, no Yokai.

Humans were also considered on the basis that there had been many notable humans throughout history of great power, and possessed great ability to bring other beings together for a common purpose. If Ophis's child were to be born half-human, they had the chance of being a great leader and fight. Not only that, but there was the very slight chance that her child would be born with one of the greatest gifts God had given to humans: a Sacred Gear.

However, humans too were discarded as non-viable. While having a half-human child did means there was the possibility of all those benefits, there was no guarantee of it like with the other races. And not only that, but the chances of her child getting a Sacred Gear were about one in a million. That was a gamble that Ophis was unwilling to take.

Now, Ophis considered the three largest of the remaining races: Angels, Fallen Angels, and Devils. Angels was an instant no-go, as there was no way for her to convince any devil, male or female, to sire her child without having that Angel become Fallen in the process. That narrowed the field to Fallen Angels and Devils. Fallen Angles was not a bad idea, as there were certainly more than a few stronger being within their ranks, their leader Azazel being a prime example.

Ophis hummed. Now, that was actually not a bad idea. If she were to manage to get into bed with Azazel and become impregnated via his seed, then her child with have the genetics of a twelve-winged Fallen Angel. That would in turn mean that her child would have access to the powers of using light as a weapon, as well as the intelligence that Azazel himself had displayed as leader of the Grigori throughout the centuries. That fact that Azazel was a known pervert could even mean that getting him to have sex with her would be easier.

That was honestly saying little, thought. While Azazel was a "ladies' man" and was reputed to have fallen because of his own lust in first place, that intelligence he had displayed has meant that he was unlikely to be fooled into being seduced and would instead discover her intention before they even got into bed. And there was the fact that Azazel's pervertedness could possibly be passed down to her child.

Ophis shuddered at that. If there was one thing that her child would not be, it was a pervert.

Which meant that she now turned her thoughts to the last candidate. The Devils. Like the Fallen Angels, the Devils were a large faction and possessed several powerful beings. Heck, their entire system of organization revolved around being led by four Devils of extreme power: the Maou. Each one were strong beings in their own right, and to have a child with one of them would make certain that her child would be as powerful as she envisioned.

Not only that, but the fact that there were four Devil leaders quadrupled her chances of having her desired child. Then there was the fact that, were her child to have Devil blood, then there was a very significant bonus that he or she would have—the ability to use Evil Pieces and build a peerage. That thought actually caused her to release a small smile. Yes, the idea of her child growing to be a strong devil/dragon hybrid and building their own peerage was one that she liked a lot.

It was decided, then. Ophis would have a child with one of the four Maou.

But which Maou would she choose from? There was Serafall Leviathan, Ajuka Beelzebub, Sirzechs Lucifer, and Falbium Asmodeus. Perhaps it was because of the fact that Ophis had been in a female form for the past few centures, but she felt the desire to actually give birth to the child herself, rather than impregnate someone. So, the ruled out Serafall Leviathan. Falbium was also ruled out, as she had seen the man's almost inhuman sense of sloth and had no desire for her child to be such a slacker.

Ajuka was almost cast off for the same reason, but it had been shown that the Astaroth devil was dependable when needed. And his intelligence was also far above that of his peers for him to do something such as create the Evil Pieces themselves. Were she to seduce Ajuka, then she would also be in his palace, which would the prime place for her to steal a set of Evil Pieces for her child to use in the future.

But, in the end, Ophis decided against seducing Ajuka as well, as the man's passion for inventing was sometimes even greater than his dedication to his job as Maou, which was not a trait she desired in her child, And even if she did not seduce Ajuka, she could still sneak into his estate and steal a set of pieces later. You would be amazed what being a true shapeshifter like herself enabled her to do.

Which mean that the field of candidates for the other parent of her child was narrowed down to one: Sirzechs Lucifer.

Ophis retained her smile at that. Out of all of the Maou, the former heir to the Gremory house was by far the most powerful of them. Not only that, but the Maou was known for his kindness and preference towards avoiding combat. That said, he would not hesitate if he needed to fight, and was very devoted to his family. Rumors were that when the Lord and Lady of the Gremory house told Sirzechs that they planned on giving him a sibling, he nearly blew a hole through an entire side of the Gremory Manor in excitement.

Even without the strength that Sirzechs possessed, he did possess a unique gift amongst the devils: the Power of Destruction. Granted to him by his mother's blood from the Bael clan, that ability alone allowed the Crimson Satan to take any matter, living or not, and completely disintegrate it to the point that not even dust remained. If Ophis's child were to have that power along with her own, then few would be able to match them once her child become skilled with her power.

Of course, there was no guarantee that her child would got the Power of Destruction when it was only a quarter of the Bael clan blood against her own. Either way, Sirzechs, by her estimation, the prime candidate for fathering her child. And there was one last thing that made him the perfect candidate to seduce: Sirzechs Lucifer had a wife.

If it weren't already for the fact that the man completely loved his family, the fact that Sirzechs was married was the icing on the cake for choosing him. In order to get in bed with the Maou, all she needed to do was shapeshift to look like his wife, Grayfia Lucifuge, have sex with him, and it was done. It would need to be done at a time when Grayfia was not home, but it could be done regardless. Even better, she had no fear of acting out of character since Grayfia barely showed any more emotion than Ophis herself.

It was decided, then. In order to defeat Great Red, Ophis would disguise herself as Grayfia Lucifuge and have sex with Sirzechs Lucifer in order to have a child. It was genius, if she were vain enough to say so.

Now, all she had to do was keep a spying eye on both Sirzechs and Grayfia to determine the best time to initiate her plan, and then get into the Maou's bed. And once that was done, she'd wait until she was ready to give birth, do so, and raise the child until it was ready to begin helping her with her plan to defeat Great Red. She had been trying to get rid of the Apocalypse Dragon for centuries; she was willing to wait this much longer.

Though, raising the child did mean that she'd have to complete such tasks as feeding him or her, making sure that they were healthy, training them to become a powerful fighter, teaching them everything academic or not that they needed to grow up to be mature and intelligent…

Ophis blinked, and finally spoke aloud. "This… is going to be harder than I thought," she said.

That puts an end to that plot bunny. I think that I did a pretty good job of describing the train of thought that led Ophis to this decision, as well as how she plans to go about it. So, what do you all think? Should I make this into an actual fic? Let me know in the review box!

Please review! If you flame me then Bruce Lee will smash you with his nunchaku. (I'm just kidding… or am I?)