Chapter 1

A/N: Another another new story! I'm sorry to those following my other ones but I just got back into anime after not watching any in a long time and after discovering Highschool DxD I just had to write a crossover with Harry Potter. Just so people know, I am most likely not going to continue my story His Own Side. I don't have enough of it planned to actually know where I wanted to take it in the end, but I will probably use some of the elements of it I was planning in other stories. If you're following The Wizard and the Grimm, never fear, I should be back to it soon. Sort of like His Own Side, I'm not sure how far I'll go with this one, but I have some cool ideas for it, so I'll see how it goes. As always, please leave me a review and let me know what you think. Enjoy!

UPDATE [2017/06/17]: Made some changes to this chapter to fix things and make sure they fit with the story going forward. It's nothing too major but I think it reads much better now. I'll check my other chapters as well and make updates if needed.

Harry Potter, the not quite sixteen year old wizard, sat in the smallest bedroom of number 4 Privet Drive, focused on the piece of paper in his hands. His relatives had left him alone for the night, going out to dinner. They were celebrating something else that had gone right for them in their perfect little lives, leaving him alone, not that he'd want to join them in the first place. He knew they had told him what it was about, trying rub it in, but for the life of him he couldn't remember what it was. It might have been a promotion at work, or maybe they'd won a contest? He wasn't sure, and frankly could care less.

Saying his thoughts had been somewhat occupied since his return from his fifth year, at Hogwarts, would be a gross understatement. Besides his trauma over the loss of his godfather, the closest connection he had to his deceased parents, he now knew the truth of the prophecy. He now knew for sure that he was the only one who could kill the most powerful dark lord of their time.

It was all of this information being dumped on him that lead him to his current course of action. He was still a little uncertain that it was the right thing to do, to be playing around with this thing, but he was feeling desperate. It was his only chance. The piece of paper he was referring to was something he'd acquired from his ill fated trip to the Department of Mysteries. He'd been running through one of the many strange rooms in the department, having been split up from his friends, when one of the pursuing Death Eaters accidentally hit a large filing cabinet beside him with a curse. The blast it produced had knocked him off his feet, and left him with his ears ringing.

Crawling to his feet, he'd discovered a single piece of paper that had seemed to have escaped the blast. A quick glance had shown it to be covered by unrecognizable symbols. Hearing the sound of more approaching enemies, he'd thrown it away and continued on trying to find his friends.

It wasn't until later, after his godfather had been killed, and after he'd heard the truth from Dumbledore, that he'd seen it again. He'd reached inside his pocket, and was surprised to find something there. Pulling it out he found to his confusion it was the same piece of paper from the Department of Mysteries. Shaking his head, he'd crumpled it up and threw it into the garbage. An hour later he found it back in his pocket.

At that point he'd started to become concerned. He'd been about to bring it to show Dumbledore, despite his current anger at the old wizard, or at the very least Hermione, but had eventually decided against it. Something was telling him it wouldn't be a good idea. Harry had at least copied one of the strange symbols onto a piece of parchment and shown Hermione. She'd been able to tell him almost immediately that it was Japanese. She'd tried asking him where he'd seen it but he'd brushed her off, saying he'd seen it somewhere in a book. He didn't want Hermione looking any further.

Soon after he'd been returned to his relatives, he'd managed to sneak out and acquire an English/Japanese dictionary. Despite the fact that he couldn't get rid of the thing, he wasn't sure why he felt so drawn to it. He hadn't been able to translate the whole thing, but what he did get out of it was that it had something to do with summoning aid. From what he could tell people in the wizarding world didn't seem to be religious at all, but after discovering magic, he wouldn't be surprised if there were such things as higher powers.

The paper almost looked like one of those flyers you'd see preachers handing out on the street and he would have dismissed it as such if it weren't for the fact that it was clearly magical and originally locked up in the Department of Mysteries. If he could figure out how to work it, he wouldn't actually be adverse to summoning help. Maybe whatever answered would be able to help him take down Voldemort. He knew there would probably be a price involved. In all the old stories, the summoner always had to pay a price, but he would gladly pay almost anything if it would help him accomplish his goal.

He spent almost half an hour trying to figure out the flyer. He didn't want to be alone anymore. He knew he couldn't do this on his own, he needed help. Finally, frustrated at his failure and resigned to the fact that he was truly alone, he threw the paper away from himself wishing more than anything that he actually had a family that supported him. As it fluttered to the floor he felt a sharp pain in his finger. Cursing his bad luck, he stuck said finger in his mouth trying to dull the sudden pain from the papercut he'd received. The metallic taste on his tongue was quick to alert him to the fact that he was bleeding. Glancing down at the fallen paper, he was just in time to notice a few drops of his blood fade into the page like it had never been there. It bore a disturbing resemblance to how ink used to disappear into Tom Riddle's diary.

Once again starting to panic, Harry tried to figure out what to do. He didn't like the fact that what just happened bore any similarity to that accursed diary. Additionally, it had been his blood that had been absorbed, not mere ink! He'd been highly sensitive to anything to do with his blood, after both Voldemort had used it to resurrect himself just over a year previously, and after being forced to write lines in it by Umbridge during the last school year.

Before he could think on it any further, Harry's room was bathed in crimson light from glowing circles that had appeared on the ground. There was a bright flash of light, a loud boom, and the house shook around him, before all was silent once again. Blinking his eyes to try and clear the spots that had appeared from the flash, he gaped when he could finally see again.

Where moments before had been the glowing red circle, now stood a girl who appeared to be a year or two older than himself. The first coherent thought he could form was that said girl was incredibly attractive.

Despite not having the best track record with the opposite sex, Harry had always been aware of the girls around him. Even with not having any interest in her that way, he'd realized Hermione had gotten fairly pretty as she'd matured. There'd been his now cringeworthy infatuation with Cho Chang that had started in fourth year. It hadn't completely died out until several months earlier. He should have known that trying to get involved with her so soon after her last boyfriend had been murdered was probably not the best idea. The fact that he had been present at said murder didn't help things.

Apart from Cho, he'd found himself sneaking peaks at Ginny Weasley in the past few months, despite the fact that she was off limits as Ron's sister. He didn't even want to think on how Ron would take that.

He'd be crazy if he didn't admit to finding Fleur Delacour incredibly beautiful, even if he hadn't lost his mind around her like Ron had. Lastly, even if he was currently trying to suppress the memories from the past year, Sirius had been quick to tease him over the miniscule crush he'd gotten on his cousin Tonks. It had been an embarrassing, but couldn't help himself. She was a twenty-something metamorphmagus badass Auror. He knew all the kids in Grimmauld Place had all agreed that Tonks was pretty cool.

Harry was definitely aware of the females around him, yet no one had seemed to catch his eye quite like the girl in front of him. The first thing that drew his attention was her hair. It was crimson red in colour and incredibly long. It seemed to stretch all the way down to her thighs. Harry didn't think he'd ever actually seen a girl with hair that long, but he liked it. Both the Weasley's and, from what he could tell in pictures, his mother had been redheads, but none of them could match this exact colour. He was sure it couldn't be natural.

His eyes met her curious gaze a moment later. They were a light blue, with a hint of green, though definitely not as pronounced as his own emerald orbs. He couldn't help his eyes from trailing down the rest of her figure after that, and once he did it took all his self control to not immediately start drooling. Her figure was perfect. He never thought he'd see someone outside of another veela that would give Fleur a run for money in that department. The school uniform she was wearing, which was much more revealing than the robes at Hogwarts, was definitely not helping Harry in that regard. He forced his eyes away from the creamy exposed skin of her legs, passed her perfect hourglass figure, and extremely large bust, to meet her eyes once again.

"You summoned me?" She finally spoke, before pausing looking slightly confused. "English?" She paused, "British english?"

Harry was really confused, trying to figure out what was going on, but he managed to nod dumbly. A strange look passed over her face for a split second, but it was gone so quickly Harry questioned if it had ever been there at all. She smiled at him, it looked professional yet kind.

"How did you manage to summon me?" She paused, that strange look flickering across her face again. "I don't usually… well… most of my summons come from Japan. How did you get one of my contracts?"

Harry tried to muddle through what she'd just said, but was still confused on what he'd done himself. "Err… what?"

Gasping suddenly she answered, "Oh, I'm sorry, I forgot my manners. My name is Rias Gremory, and I am the devil you have summoned."

"DEVIL?!" Harry scooted back a little bit, once again cursing his luck. He knew he shouldn't have played with that piece of paper. He'd thought he might have been able to summon something to help him, but not a devil or a demon or whatever she was.

Rias frowned, "Of course. You must have known that when you summoned me? Being a devil doesn't make us evil you know. That's mostly all superstition from the church." She'd obviously caught on to his momentary fear, and was trying to calm him down.

He inched back forward a bit more on the bed, feeling a bit guilty of his reaction, much like how the other students had reacted to him being a parselmouth in second year. He was still reeling from this turn of events. "Sorry… this was actually an accident. I wasn't trying to summon you when it happened. I wasn't even sure that devils were real until now."

"Accidentally? You can't accidentally summon a devil… especially if you didn't even know we exist." She paused clearly deep in thought. "This is really strange. Can you explain how it happened?"

"Ahhh… sure. Well, I recently got ahold of this strange piece of paper in Japanese. I tried to translate it but only made out the fact it had something to do with summoning help. It seemed magical so I was trying to figure out what it was. Then by acci-"

"Wait! Magical? Our contracts are magical or they wouldn't work." Her smile had dropped off her face but she didn't look antagonistic at all. Despite that, her piercing gaze was making him nervous. "Do you still have it?"

"It's actually on the floor behind you."

The red haired devil spun on the spot, eyes alighting on the paper, before bending over to pick it up. Harry felt himself blush heavily as he got a quick glance right up her skirt as she bent over. Those uniforms really were nicer than the ones from Hogwarts.

"This is a contract alright," she was turning it over in her hands.

"What exactly are the contracts?"

"Contracts are things devil's hand out to humans. They themselves are magical for those who can't use magic themselves. They can then use them to summon the devil to perform a service for them in exchange for a payment of some kind." Rias who had gone back to looking at the spent contract while speaking, once again fixed her gaze on Harry. "You specifically pointed out the fact that it's magical… you're a magician aren't you?"

Harry was only taken aback for a second before realizing that with her being a devil, it was only natural she would know about the magical world, "Do mean a wizard?"

Rias sighed, "This isn't good. This. Is. Not. Good." She ran her hand through her long hair, something that distracted Harry for a second as his eyes followed the movement of her beautiful crimson locks, but her sudden agitation was unsettling enough for Harry to pull his attention back into focus

"What's wrong?"

Ignoring the question, Rias asked one of her own, "Is that it or did anything else happen when you summoned me?"

Harry paused for a second to think it through before answering, "Well, I couldn't figure out how it worked so I was going to try and throw it away again. Every other time I tried it just came back to me on its own. Anyway, when I did, it accidently cut my finger on it. Some of my blood seemed to be absorbed into the paper, and then moments later you appeared."

"Your blood was absorbed into the contract? And you're still alive? You're ok?" She was staring at him intently before her eyes suddenly widened dramatically. "Oh hell this isn't good! What have I gotten myself into?"

"What's not good?"

Rias didn't seem to be listening anymore though as she was now pacing back in forth in the room furiously muttering over and over, "Oh Hell!"

"What's wrong?" He tried again with no luck. The attractive devil's behaviour was starting to freak him out a bit. The girl finally stopped, and stared at him. She seemed to be assessing him. A moment of silence later, Rias seemed to have come to some kind of realization as she actually smiled, though it did waver slightly as she once again looked at him. "Rias?"

The devil took a deep breath, "The reason I said I tend to stick to Japan for when fulfilling contracts are that there are groups of magic users in the world that don't tend to get on well with Devil-kind. Magicals from the UK were some of the worst."

"Oh…" Harry wasn't really sure how to respond to that. He sort felt like he should be defending his country to her, but he'd seen first hand how horrible wizarding Britain could be this passed year and found he sort of agreed with her.

"There were many wizards who were notorious for figuring out ways to use the contracts for nefarious purposes. It started to become common where wizards would use rituals that involved infusing them with there own blood, which…" she paused looking at him intently, "which force the devil in question into a marriage bond with the wizard."

Silence reigned throughout the room. "What?"

"Essentially, ever since your blood touched the contract, we've been married or at the very least betrothed. I'm not actually sure which. Nothing like this has happened to a devil since long before either of us were born." Harry just stared at her in shock as Rias sighed and leaned against the wall. "I don't really understand how this had happened though. Just your blood shouldn't have been enough, but now that I'm looking for it, I can feel the bond between us. It's magical in nature so if you try, you can probably feel it too."

"B-but I… I… you… we can't be married!" He spluttered loudly.

"Oh? Am I not attractive enough?"

"What? No! You're like one of the most beautiful girls I've ever met…" Harry trailed off when he saw the teasing glint in her eye. She still looked a little weary, but she was obviously trying to lighten the mood a bit.

She preened, "Why thank you for the compliment."

Feeling embarrassed, he ignored her last comment, "You seem to be taking this whole situation rather well."

Her face darkened slightly, "Trust me, if I didn't know that this was an accident and you had done this on purpose instead, I'd have been a lot more pissed. Aside from that, my father already betrothed me to another devil I hate. He's several years older than myself and is a complete creep. I've been trying to find a way out of marrying him for a while. After what you've done, it'll have broken the contract my father signed. We don't know each other that well, but you seem ok. It'll be better than being with Riser at least."

"Gee… thanks. That makes me feel so loved," his dry delivery had Rias smirking.

"Well it would probably be best for us to get to know each other," she pushed herself off the wall and hopped up on the bed to sit facing him cross legged. This only served to distract him again, as it flashed him with more of her skin, and made her significant bust bounce at the sudden movement.

He snapped himself out of it, and met her gaze with a faint blush at her obvious amusement, "You're probably right." He sighed, "I guess I should tell you about my life."

"So that's basically it," Harry had just finished filling in Rias on the highlights of his life. There was a lot of stuff he talked about that no one else had known except Ron and Hermione, or even some stuff he'd never shared with them. Even if some of it had been difficult to share, he'd figured it was best to come completely clean with her, especially since they were now going to end up married. A concept that still hadn't settled properly into his mind over the past hour.

Suddenly, before he even realized what was happening he was pulled into a hug. Even after all these years he wasn't quite accustomed to receiving them yet, seeing as the only ones who ever hugged him were Hermione or Mrs. Weasley. While he'd always found them a little uncomfortable, this one wasn't. Being held by Rias felt safe. Being pressed up against her shapely body was also nice for other reasons in his opinion, but he chose not to voice that. "Don't worry, I'll help you deal with this Voldemort, and I won't leave you either. No future husband of mine will suffer in this house ever again! Maybe I should give your relatives a reason to fear devils as much as they seem to your magic!"

Harry was actually a little surprised how protective and possessive Rias already seemed. If he extended his senses, outwards, he could faintly detect some kind of bond between them, just like she'd mentioned earlier. He was surprised that the feeling of it, in the back of his mind, already felt comforting to him.

"Am I going to have to be worried about your family coming after me now. I've destroyed the contract your father set up…"

Rias untangled herself from Harry before standing wandering around the sparse room curiously, "I'm not quite sure how they'll respond. I know the Phenex clan will be angry. Father may be as well. My mother and brother both knew I detested the idea of marrying Riser Phenex, so they will be happy I got out of it, but the stigma attached to devils being trapped by wizards is still strong. Many will have difficulty seeing passed that."

Harry sighed, "I guess things can never just be easy. I'll probably have a whole species of devils out for my blood now."

Rias turned around and approached him again, lightly cupping his face, "Don't worry Harry. I'll keep you safe. We can't stop them from talking, but no one will lay a hand on you." Despite it only being a touch, Harry figured it was probably the most intimate moment of his life so far. He wasn't used to people caring for him so much. And even though they'd only just met, Harry could see the sincerity in her eyes. She cared. He didn't know why she would for a stranger like him, but she did.

Once again she backed and resumed her little wander about the room. She was just taking a peek at his open school trunk when he saw her freeze, "What's wrong?"

She didn't respond so he quickly crossed the room to see what she was looking at, "What's this?"

"Oh… that's my invisibility cloak. It does pretty much what the name suggests. It's one of the few items I have passed down from my parents, my father specifically in this case."

"It can't be…" she started running her hands over it with her eyes closed. "This is one of the Deathly Hallows!"

"What?"

"The Deathly Hallows. Do you not know the tale. Everyone knows it, even devils like us, as well as the angels and fallen angels."

"I've never heard of it before."

"It's a story about three brothers, wizards of the ancient days, who made a pact with Death."

"Death? How do you make a pact with death?"

"They made a pact with the manifestation of death, not the act of dying. Every major force of this world has a manifestation, though most humans don't believe in that anymore. Anyway, they made a pact with Death and received three objects, one for each of them. The oldest brother an unbeatable wand, the middle brother a stone that could supposedly bring back the dead, and the youngest a true cloak of invisibility. Stories of the wand pop up once in awhile as it usually passes from owner to owner through murder, the stone has been lost to history, while it is said the cloak is still passed down from father to eldest son. The only one who lived to sire a son being the youngest brother."

"And you think this is that cloak?"

"I don't think that, I know it is. I can feel the power coming off it."

"So that means the youngest son in that story is my ancestor?"

"Exactly! Legend tells that the one who is able to reunite all three hallows will become the Master of Death."

"What exactly is the Master of Death?"

"No one really knows, but it is believed that they will become the avatar for the aspect of Death itself. There are also rumours that only a descendent of the brothers can collect the three items and become the Master of Death, but like I said before, no one really knows."

"Wow!"

"Indeed," Rias gave a small smile, "If I am to help you defeat Voldemort, I believe we now have a plan. I believe I can help you track down the other two Hallows. Being a devil, I am sensitive to the type of energies surrounding these objects. Now that I've felt the Cloak, it should make it easier to find the others."

"You think I should become the Master of Death?" Harry asked incredulously.

"Yes I do. From what you've told me about your life, I believe you will be able to handle to power. This should also protect you from any retribution the Phenex family may attempt. I may not have to worry about transforming you into a devil either. If they-"

"Wait what?" Harry asked interrupting her, his mind still stuck on the last bit. "What do you mean transforming into a devil?"

Rias looked confused, "Well I was obviously going to make you a devil. We were going to have a hard enough time with the fact that you were a wizard reincarnated into a devil. Especially since we had to step on the Phenix's toes to do it, but they would never accept my marriage to a human. They'd just kill you to try and break the bond."

"B-but that's crazy!"

"You have to understand Harry, the birth rates for devils are extremely low and after the great war between us, the angels, and the fallen angels, our numbers have plummeted. The birth of pure blooded devils is of the utmost importance in our society.

Harry's face scrunched up in disgust. "It seems I can't escape the whole stupid pure blooded movement no matter where I am."

"I don't agree with how our society looks down on reincarnated devils, and despite how it may seem, it doesn't make sense if we don't want our race to die out."

He was about to snap back at her in response, thinking about how Malfoy treated people like Hermione, before he managed to bite his tongue. He may not like it, but if their race was as in danger as she made it sound, maybe it was required to survive. He'd reserve his judgement for later, though the idea that she wanted to turn him into a devil was somewhat alarming.

"As I said, they would never allow the next head of the Gremory family to marry a human wizard, but I don't believe they would never dare speak ill of joining our family to the Master of Death. No matter what, I will be by your side though."

Harry was happy with her response, but his mind was stuck one small detail, "The next head of the Gremory family?"

"Oh yes, I must have neglected to mention that."

Harry nodded, "And I'm assuming that is important in devil society?"

"Of course! My family is one of the highest ranking clans of the remaining seventy two pillars of underworld. My older brother is also the Satan Lucifer by the way."

"L-l-lucifer?" Harry couldn't help but once again wonder what the hell he'd gotten himself into.

"The position Lucifer. The four Satans are the four devil kings. He's not the original Lucifer. He's dead."

"Oh…" Harry wasn't quite sure if that was any better or not. "But what were you saying earlier about me not needing to turn into a devil though? How will these Hallows change anything?"

"Well, I'm not completely sure, but I have a feeling once we manage to track these things down, the situation might be different. If not, I can always turn you at that point. I still have 8 pawns left anyway."

"Pawns? Like chess?" He asked confused.

"I'll explain it tomorrow," she waved him off. "It's getting late. We might as well turn in for the night. I believe we can start our search tomorrow."

"Oh ok… that sounds fine." Harry was honestly still trying to keep up with all the information that had just been thrown at him. He couldn't help but shake his head though. Of course he couldn't just summon a regular devil… no! It had to be one whose older brother was a devil king. He already knew how protective Ron was of Ginny, so he had no inclination to find out what Rais's brother is like. Despite all that, he could tell he was already coming to like Rais. He was glad she was the one he summoned instead of anyone else. "I'll throw a couple sheets on the floor. You can take the bed."

"Nonsense! We have a marriage bond now. You stay in the bed with me."

"Uhh, ok thanks. I'll just go get ready in the bathroom."

"Ok Harry." He crossed into the hall, happy that his relative were still out, not wanting to know how they would have reacted to having a devil in their home. "Oh, and just so you know. I like to sleep in the nude!"

Harry's mental processes screeched to a halt, "WHAT?"