Harry Potter / Highschool DxD : A deal with the devil

"Who am I, you ask? I'm a long-forgotten creature, a young human. A creature that once seeks vengeance upon a certain realm. I've spent so long seeking vengeance, and after I've accomplished my goal I let Big G, that red overgrown lizard, and those devils seal me away in this place, mostly because there was no reason for me to roam the Earth anymore."

Thomas couldn't believe what he just heard. The Titanic dragon had once been on Earth? Certainly, something like this should have been written in some books no? Yet, there's no mention of such a thing anywhere, at least anywhere Thomas could search, but at the same time, if he didn't awaken his magical powers, he wouldn't have even known about this world either.

"Judging by the way you drift off, I take you were wondering why no one has written about me, right? Well, the truth is that very few beings survived my vengeance upon a certain someone, and those very few that survived might be dead by now. What about you young human, who are you and how did someone as young and as weak as you manage to get here?"

For a second Thomas froze not knowing what to say or do, but after he thought for a few seconds, he decided that it would be for the best to just tell this the truth about him since there was no reason not to, considering just how powerful this being actually was.

"My name is Thomas Grayson, a ten years old boy from England. As for how I got here, I have no idea. The last thing I remember before I appeared here was that I woke up in pain and collapsed on the floor while my friend and her parents tried to ease my pain."

"Oh? Let me take a closer look at you, young human."

Before Thomas could respond, the dragon touch his body with one of his claws, scaring the daylight out of him. Just as Thomas thought that nothing would happen a bright light emerged from his body making the dragon nod as soon as he saw the light before it took his claw back. Meanwhile, Thomas's body slowly changed into something else, something that wasn't human. At first the glowing slowly dies before black tattoos spurred from within Thomas's back extending all over his back into a series of random-looking swirls, circles, and lines all across his body, ending in a pointed arrow at the base of his neck.

Once the tattoos covered his back, something else happened. From the center of the tattoos black scales started to cover, his body at an alarming rate until it reaches his arms turning them into claws, and if that wasn't bad enough, the same thing happened to his legs. Just as he thought that his nightmare ended, two curved horns emerged from his head making the boy fear that he would have to live with this body from now onwards. Almost immediately after the horns appeared, two large, scaled wings that were twice the size of his body had burst from his back and the last traces of human skin on his had been covered by the metallic-black scales. Resembling the wings of a newborn bird, the wings were bloody and wrinkled, making Thomas wonder if those were really the when he instinctively stretch them wide.

"Don't get too comfortable with this form, young human, for this won't last forever. You just have a taste of what our new partnership can get you if we both play our cards right. So what do you say, have you considered becoming the host of the worst threat that roamed the Earth a possibility?"

"I-I… no. This is new to me."

"Then this is your lucky day, Thomas Grayson. From today onwards, you will become the host of the Bahamut. Be proud, young one, for our path will be anything but easy. Now go back, your friend is anxious about your return to the land of the living."

Before Thomas could react he felt his body being shaken by someone who wanted him awake.

"Tom! Tom! Wake up!"

He opened his eyes to see the crying face of his friend looming over him as she was shaking him.

Still drowsy and confused from the strange and scary dream he just had, Thomas barely registered what happen when Latia notice that his eyes were opened and he was looking at her.

"Tom!"

A second later, Latia hugged her friend, almost knocking the air out of his lungs, when Lilith gently removed her daughter from the young boy, fearing that Latia might just kill him. Once Thomas regained his bearings, he lean against the bed frame before looking at the mother and daughter pair, confused as to why was he in an unfamiliar bed.

"Aunty Lilith, where am I?"

"You are in our home Thomas. Last night you pass out in pain and we brought you to the bed. I know that this might come as a shock to you but we had to call a healer to come and check up on you. We should have called your parents, but considering that you suddenly collapsed and pass out in pain, I feared that your parents would react badly and that wouldn't have helped you at all. Thankfully, nothing bad happened to you, instead, the healer believes that last night's episode was a side effect of you being the host of one of the sacred gears."

"What's sacred gear?"

"The sacred gears are items with powerful abilities bestowed upon humans by the father of angels. Anyway, I will let you rest now, but if you need something don't hesitate to tell Latia or even call me or my husband."

"Thank you, Aunty. If it wouldn't be a hassle could you please contact my parents and tell them that I might spend the rest of the day here, of course only if that is alright with you."

"No problem dear. We are happy to have you here."

Latia left shortly after his mother, mostly because she wanted to be the one who will bring Thomas breakfast, leaving the young boy alone in bed. Just as he started to remember the conversation he had with that Titanic dragon, a voice echoed in his head.

[So this is how the underworld looks now. I have to say, you are truly an interesting young boy, Thomas. I can sense three… no, four types of energies around you. Holy, demonic, human, and godly magic, that's quite a lot for any being. If we manage to merge all of those energies with my magic, you, my host will become one of the most terrific opponents this universe has ever seen, a being stronger than even me.]

{Wait for a second, sir. Aunty Lilith said that I awaken a sacred gear, what about that?}

[Thomas, you are my host so you don't have to address me in such a formal way, also you are quite young so I do need to explain from the begging what those sacred gears are. The Big G created the Sacred Gears as part of his system to enact miracles on Earth. From what I know the only ones that can be born as a sacred gear hose are humans or human hybrids. As for how you become one, well I had to somehow become your host and the only way for that to happen was for me to forcefully enter Heaven's system and turn a small part of my power into a sacred gear connected directly to my real body. No being in this world, other than the red lizard and maybe a few of the top gods could detect my aura, while the rest of the creatures in this world would only see me as a sacred gear that gives the user perfect control over his magic.]

Hearing what truly happened last night made the young boy shocked but at the same time excited that he become more powerful, after all the more power and control the power he has, the sooner he would be able to heal his mother.

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