A/N: This is a crossover between the expanded universe Seraphim Wars novels and High school DXD anime, we hope that you enjoy it. This fanfiction will include elements from Grey Faction, John Hickson, Fake Angel, and Dingir the curse of God series. I personally consider this anime to be a perfect series to crossover with this, and I hope that you enjoy it.

DINGIR, THE CURSE OF GOD IS A TEACHER AT KUOH ACADEMY?!

Prologue

The scary new Sensei

Mark quietly walked towards prestigious Kuoh Academy, he noted the faint hum of barrier magic at the edge of his senses as he approached it's gates, the school was well protected. However Kuoh Academy was run by Devils, he wasn't particularly fond of their kind, but he had been hired to do a job, namely protecting the students under the guise of being the new English teacher. One of the four Satans had hired him via his partner, John Hickson, an immortal exorcist with a penchant for getting him into annoying and life threatening situations.

Even though he was dressed smartly in a suit and tie, he noted that he was receiving a number of suspicious glares from the dozens of young schoolgirls nearby. He had made sure to suppress his own very unique magic signature, so it couldn't be that. "Oh..." he finally realised. He was an unknown man following a bunch of girls to school, or at least walking in the same direction. He smiled faintly, he was looking forward to seeing their faces when he was teaching their classes, apparently this was the wrong thing to do as he received a particularly intense glare from the girl nearest to him, her aura tainted by demonic power. She was one of the few dozen devils here then.

He returned her glare with an amused smirk, "keep it brat and I'll give you detention," that caught the kid off guard, and they seemed somewhat more relaxed when he took a different direction, heading for the teachers' lounge as they all passed through the massive gates of the Academy.

"You think he's the new teacher?" the girl's friend asked in surprise, he looked like a big shaggy bear.

"Maybe?"

Others began to join in. "When I heard we were getting a foreigner as our new English teacher, I was hoping for a handsome blonde man like Kiba-kun, not that!" gesturing in his direction.

"Or maybe someone beautiful like Rias-senpai."

'Wow Japanese girls are harsh...' though Mark, still able to hear the conversation, and wishing his hearing wasn't so good. Those girls obviously had a very narrow view on what foreigners looked like, they were probably expecting a grown up pretty boy, not someone like him. Not that he was ugly or anything, at least average in the looks department, though his thick beard probably didn't help to attract Asian girls. Standing a teeny bit over six feet in height, and heavily built with muscles meant for combat, he probably was quite intimidating to them, his messy black hair, prize winning glare as his default face, and grey coloured eyes probably didn't help either. Well it wasn't like he was interested in them finding him attractive, but some of their comments were a little hurtful. He had the appearance of being in his late thirties, however he was considerably older than that. Not that he bothered counting age anymore, it got too complicated, he would need a calculator at this stage to get it right, once you've gotten more than six digits in your age, it gets rather pointless to keep track.

Entering the school on way to the school lounge, he was met by a serious looking girl with a vaguely aristocratic vibe about her. She wore an arm pin and band on her arm, he vaguely recalled from anime that was a symbol of those in the school council. It was probably best to greet her in which case. As he drew closer, he could sense a strong demonic presence from her, carefully hidden, but not to his senses, she was one of the so called 'purebloods' here then. Though he didn't consider her such, only the primordial devils that once ruled hell deserved that title, such as Asag or Aka Manah, now they had been good fights.

"Good morning," he said, with a faint dip of the head, Japan or not, he didn't bow to anyone. "I'm the new English teacher, Mark Green, a pleasure to meet you," he said with a polite smile.

"Good, you're early," the girl said, "the headmaster is currently not available and has asked me to guide you around the school."

"Much appreciated, and you are?"

"Sona Shitori, school council president," she replied, offering her own name in return, she didn't bow, but offered a handshake instead, though unnecessary, it was nice that she thought to offer a western greeting. Briefly shaking her hand, she froze slightly at first contact, it was swift, subtle, but he noticed it, cautiously he further hid his magic further, had she noticed it, or was it something else? "If you'll follow me..."

"Of course."

Sona showed him all the main locations that he would immediately need to know, the teachers' lounge, the cafeteria, the toilets, the class locations he would be teaching in, but provided him a map to memorize and his schedule for the week, he would be introduced within the next hour or so at an assembly, as was the custom there. His first lesson would be just before their lunch period. He wasn't looking forward to it, he didn't actually have a teaching degree, though he had been to college, and had written a series of moderately well known novels and comics, so his English skills were excellent, with a good lesson plan, he would hopefully be able to bluff his way through the year. His records had been changed to accommodate for this mission, though even his previous records were fake. Normal people didn't live as long as he did, so every decade or so, he got a new one.

He was then lead to the assembly hall, where he briefly met some of the other teachers, he took a seat with them as the students were filed into the hall. 'Jeez, there's a lot of them.'

(POV change)

Sona had been pleased that the new teacher had been early, it had meant she hadn't fallen behind her other tasks before class, but there was something strange about him, something subtle that triggered at her senses, he walked very smoothly, no wasted movement, he made no sound when he stepped or breathed, he walked with a calm, confident bearing that befitted a teacher, but he had a kind of emptiness to him, as though he wasn't there, even the weakest human had a faint aura about them, but he had none. The closest thing she could compare it to was how her annoying elder sister contained her vast demonic power so as not to crush everyone around her. But that couldn't be the case, he was human, and had been personally hired by Rias's older brother, Lord Lucifer, the siscon would never let someone dangerous teach here. She had thought all of this before he even greeted her.

He politely greeted her, a nod though, not a bow, he was prideful in a quiet way she couldn't fault him on, but when they shook hands, she saw an image flash before her eyes, a roaring black dragon with molten flesh, a split second and it was gone. He had noticed her slip up, but didn't comment on it. 'What was that?' she thought, paling slightly. Calming herself, she then showed him about the school, but she would have to keep an eye on this one.

"Okay students, this is your new English teacher, Green-sensei," introduced one of the teachers, gesturing to him, 'He'll be replacing Midori-sensei, who as you know has left following her pregnancy, she's taking time off to raise her child, I'm sure you'll all miss her, but Green-sensei comes very highly recommended, and I hope you will benefit from his expertise."

'Damn, she's setting the bar high,' thought Mark, trying to keep a sour expression from his features. He smoothly stood, approaching the front, the other teacher, Aoi-sensei, handed him the microphone, with a polite nod, Addressing the students, he began, "It's a pleasure to meet you all, I'm Mark Green, so Mark-sensei or Green-sensei is fine, and though I'll only be here for a year, I hope that we can all get along, and by that I mean you actually attend my classes and don't drive me to despair by dodging all your assignments," he said with a smile, eliciting a few chuckles from the students, "I'm sure it will be an interesting experience for all of us, and I hope you're ready to be overworked." his tone was light, but he still got a few groans. "We'll get know each other in class, so I'll end this here and let you get back to class."

(POV change)

Issei watched the new teacher with profound disappointment, Midori-sensei had been an absolute babe, and she was being replaced by this big scary guy, pregnant or not, she was the eye candy that kept him attending that class, it wasn't like he really needed to learn English, but maybe with a guy teacher, he and the rest of the perverted trio could read their porn in class without getting told off, surely a guy would be understanding or the beautiful bouncing goodness that were women's breasts and how they must appreciate them at every given moment...Right?

(POV change)

'That man is a talented martial artist,' thought Kiba from within the crowd as the new teacher returned to his seat, ignoring all the girls clambering for his attention, his movements were too smooth and precise to be a casual practitioner, more expert or master class. Assuming his King didn't notice, he would inform her after class, it might be nothing, but after the recent incident with the fallen angel Raynare sneaking into the school as a student, it was better safe than sorry.

(Later)

"My precious, give it back!" yelled Issei, crying, holding onto Mark's leg as he returned to the front of the class, dragging the student behind him with each step.

"You shouldn't read porn in class, young man," Mark admonished softly, he couldn't fault the lad for being sex obsessed, but in a school with a 90% + girl/boy ratio, you would think he was smart enough not to drool over and read comment on loudly on the contents of his porn magazine in the middle of English class, but he was wrong. Issei was certainly dumb enough to do that, the girls were giving him disgusted looks, and not enough were paying attention to his lesson plan. Unacceptable!

"Please, it's a limited edition, give it back!" Issei yelled.

"Damn it, let go!" Mark flailed his leg a bit, but the teen hung on tight, he had a surprisingly strong grip, focusing, he noticed a tiny flicker of demonic power, this kid was a devil too? "I'll give it back at the end of day, so let go!" he grabbed Issei by the scruff of his shirt, wrenching the devil from his leg, leaving the much smaller teen dangling in his grip. "Now go sit back in your seat or I'll burn it," he warned Issei.

"You Oni-sensei!" Issei yelled as he ran back to his seat, while the girls cursed the lad out on his perverseness and urging the teacher to burn it now, still it was rather amusing to be called a demon by an actual devil, but if he was this weak, then he must be a newly converted devil. How troublesome, he hated the evil piece system, there were too many paranormal beings in this world already without turning humans and yokai.

- Chapter End -

Hope you enjoyed the story so far, learn more about Dingir, aka Mark Green by checking out the Grey Faction series, which you can get on amazon, but I'll make sure to include enough information in later chapters if you've only seen the anime and not any of the books he's in.

Preview:

The strange looking devil had a lion body but still had massive H-cup breasts and a humanoid face, this was something new to him, he ignored its attempts at intimidation, instead charging at the creature with remarkable speed, he drew his sword, a black bastard sword, whose metal rippled as if made of water, he slashed at the creature, it gave a pained hiss, leaping back, he had barely scratched it, despite its ridiculous appearance, it had good reactions and senses.

"Die already, I want to eat!" the devil roared, gathering demonic power for a long range attack, but the attack came from its nipples, actually shooting lasers, so shocked was he, that he was forced to parry the lasers with his sword, rather than simply dodge. "What a strange town," thought Mark as he charged in close range, avoiding the lasers, thankfully he was a leg man, so those tits at face level only provided a minimal distraction. He rose his sword overhead, and with a massive downward swing, sliced off one of its forelegs. Blood spurted, but the sword stretched out like slime, devouring the severed limb and drinking the spilled blood.

The devil shrieking in agony, leapt back, shaking in fear. "What kind of sacred gear is that?" she demanded, as her leg slowly regenerated, using up valuable demonic power to do so.

"It's not a sacred gear," Mark replied as the black substance returned to its sword shape, "it's something much older than that system." God had made those weapons after seeing what he could do with this weapon. "Now stop talking, I have a bounty to collect."

To be continued in Chapter 1, the Prince and the Monster