I do not own Highschool DxD. Any parts that resemble the anime, manga or light novels are likely from them.

I don't believe there is an accurate timeline of HSDxD back story. Devils are said to live for ten thousand years (Volume 7, Life 1, Part 4) but how do they know that? According to the Biblical scholars God created everything in 4004 B.C. so that would only make the oldest Devils 6000ish.

Anyway, I'm going to be making it up as I go along, with a century for a Devil equivalent to a year for a Human. That would mean if Rias and Sirzech were Human there would be about a decade between them. I'll be putting the Civil War at about 1500 A.D. as Agrippa is currently the oldest known resurrected Devil, having died during 1535, so I'll say that the current Maou are about 750 when the series begins. With an age gap of 3000 years between each generation (Equalling 30 for a human), with Vali at about 16 when the series starts, his father would be about 3000 (similar to Venelena Gremory), Rizevim would be about 6000, and the original Lucifer (if he was alive) would be about 9000, along with the rest of his generation, who would now be dying of old age giving the other devils a figure for their lifespan.

Huh, that maths actually kind of works, I think.

- E.P - E.P -

Issei was a fairly ordinary low-class Devil born to unremarkable parents, with all his grandparents having perished during the war against Heaven. They lived in territory owned by the Lucifuge and in doing so had had to pledge their allegiance to the House of Lucifuge. His Mother worked as one of the many maids in their castle whilst his Father was one of the many Devils who dealt with the only payment a Human could make for a Devils Service.

Their Soul.

All in all, Issei was no different from any of the other Devils born during this time. And a great many were born, a most of the more important House had been graced by the birth of an Heir in recent years, and there was talk that the Lord Lucifer himself was debating a new push in the war against Heaven when they grew older.

With Heirs who would become the new most powerful leaders and millions of House-less low-class foot soldiers, Hell might be able to conquer the Heavens. Most of the Houses were looking forward to this and had begun to train their Heirs in anticipation, even if the commoners were reticent, not wishing for the lives of their children to be thrown away.

But what did the Great Satans care for the opinions of the commoners.

Issei would have been a forgettable member of Hell's faceless Legions, if it weren't for one meeting that would change the course of his life forever.

- E.P - E.P -

A seven year old Issei was wandering around the park near his home when he saw the man, his wings hidden and covered by an elegant coat.

The park was fairly quiet, the combination of a devils long lifespan and quick maturity meant there were only a few girls playing together whilst their mothers watched over them. Unfortunately, this also meant that Issei didn't have any male friends his age, and he didn't want to be friends with girls.

Girls were icky.

Still, Issei walked over to the man who was so busy staring that he didn't notice his approach. After a few futile minutes waiting for the man to notice him, Issei decided to work out just what had the man so engrossed. It wasn't easy, the man was much taller than Issei but he seemed to be staring at the young-looking mothers, more specifically, their chests.

"Mister?" Issei asked, tugging on the man's sleeve, "What are you doing?"

"Hm?" The man replied, looking down at Issei with a surprised expression.

"What are you looking at?" Issei asked again.

"I'm looking at those beautiful women, of course," The Devil answered, "What else would I be doing?"

Issei considered this for a moment before asking, "Why?"

"Why?" The man said, confusion evident on his face, "Because female Devil's figures are Lord Lucifer's gift to male Devils, it is our duty to ogle them, how can you not know this?"

"Duty?" Issei parroted blankly.

"Yes!" The Devil cried "Our duty to ogle, grope and suck breasts!"

"...Are you sure?" Issei asked slowly, turning the idea over in his mind. There were times when his Father seemed to stare at his Mothers chest after all...

"I am Shamdon Asmodeus!" The now identified man shouted, "Grandson of Lord Asmodeus himself! I am never wrong!"

"Wow..." Issei murmured, looking up at the High-class Devil.

"I suppose you're only a year or so older than my son, Creuserey" Lord Shamdon muttered, "Still, you'll understand when you're older and then it will be your duty, understand?"

"Yes, Lord Shamdon," Issei replied respectfully.

"Hm," Lord Shamdom sighed before giving an imperious wave, "Now leave me, I have an important meeting with Lord Lucifuge and I cannot afford for you to hold me up."

- E.P - E.P -

If it had been any other Devil who had been told this then it would simply have been forgotten as they grew up and nothing would have come of it. Unfortunately for Issei, Puberty was about to hit him.

And it hit him Hard.

- E.P - E.P -

Six years later

Issei stared down at his lower body in disappointment, a lingerie magazine discarded next to him on his bed. He'd mean pleasuring himself to the images inside it as well as his memories of peeping on the women who lived nearby. Those Memories were few and far between though, their magic making it too dangerous for Issei to attempt it as often as he would like. In comparison to the small fireballs they could throw or hose-like blasts of water, Issei could barely make more light than a match or enough water to fill a shot glass.

Hence the magazine.

Nevertheless he'd it had been rather enjoyable, the only problem was that he was still horny, he still wanted to fap but his body?

Well, that was all tired out.

He could go twice, maybe three times before his body refused to cooperate but that wasn't nearly enough to satisfy his lust. He had been trying to train himself to go longer but it was a slow process and he didn't know any magic that would allow him to go for longer and, given the only people who would teach him were his parents, he wasn't willing to ask for help.

Still he could try to make a technique but he had no idea where to start!

Issei knew how to gather and channel his magic out of his body to create a spell but could he then channel it back into his body to make himself last longer?

Perhaps he could give it a try...

- E.P - E.P -

"AAAAARRRGGH!"

Issei's Mother and Father glanced at each other when they heard the scream from upstairs before turning away, is Father busying himself with the paper, whilst his Mother stared out of the window.

"Nice weather we're having, isn't it," She said, carefully ignoring the swearing from above.

"Bit cloudy on the horizon, though," Issei's Father replied even as something started banging onto the ceiling.

- E.P - E.P -

It was nearly a month before Issei was healed up and mentally prepared enough to try again, and even if that technique might work with enough practice, he wasn't willing to try it again. Still perhaps he was on to something there. Maybe, rather than release it from his body then bring it back, he should not let it leave his body in the first place?

Issei summoned up some energy cautiously, remembering the painful failure from before, and slowly tried to direct it to his groin. It was... difficult, to say the least, still he pushed onwards, trying again and again to achieve the goal of being able to fap for longer.

It... didn't work. All the energy he could muster was seemingly floating around inside his body fairly evenly, so perhaps he had succeeded, even if it was much lower than what he had intended. Leaning over he pulled out his porn stash from beneath his bed, cunningly disguised as a box marked 'Old Toys', and retrieved some material.

His was about to begin when he noticed that all of the magic was quickly seeping out of his body, and unless he concentrated really, really hard, too hard to actually fap, then he would lose all of the magic before he could take advantage of it.

It seemed he needed practise.

Lots and lots of practise.

- E.P - E.P -

Over the next few months and eventually years Issei got better and better with his nameless technique. Once he had managed to hold the magic in with a fairly low amount of concentration, something that would have taken most Devils a month or so but ended up taken Issei the best part of a year, he didn't bother to take it any further. As long as the magic was limited to inside his body, he could hold the technique for as long as he concentrated.

After a bit of testing, Issei had determined that his spell depended on his base toughness, then multiplied that by his magical strength, making him roughly twice as tough. Still, that only allowed him to go for twice as long, so he tried to increase both his base toughness and his magical strength with... varying results.

Asking his parents for tips on how to get stronger magically, whilst being careful to leave out why he wanted to be stronger, all they could really do was to give him some basic exercises, concentrating his magic into a shape and so on, and tell him to keep practising.

Oh, and that imagination was key.

As for toughness, he just tried to get fitter, lifting weights and jogging were his two main exercises, although a lifting a couple of rocks he found and the running the length of his back garden again and again weren't exactly professional methods.

Still, bit by bit, he got better, until he could fap more than two dozen times in a row. Issei thought that was something to be proud of. Didn't mean he was actually going to tell anyone about it.

Although he did learn to take frequent breaks for water when he dehydrated himself so badly he had to stay in bed for a week. He never told his Mother how it happened.

Still as he'd grown up he'd become more and more attracted to the girls who lived nearby and wished that just one of them would agree to date him. Unfortunately as a growing lad his fantasies warped and changed until one day Issei woke up with one though in his mind, one ambition in his heart.

"I want a Harem."

This however, was easier said than done. The only Devils who did have multiple partners were high-class devils and Issei was most certainly not one them. If he wanted a Harem he'd have to get promoted twice, attract the attention and love of a girl from one of the seventy-two pillars, then convince her to allow him to have multiple mistresses and actually find said mistresses.

Taking it one step at a time, the first step was to get promoted. He could get an excellent contract that would impress all his superiors and allow him to be promoted... but he didn't know how to make contracts. That left Military accomplishments... but he couldn't use any offensive magics particularly well.

All in all, it seemed like an impossible to task for a talentless, low-class Devil. But Issei really, really wanted it.

- E.P - E.P -

Eventually though, the good times ended and when Issei was seventeen the order was passed through each of the seventy-two pillars for them to assemble their Legions. Where Issei lived, each family that had pledged itself to the House of Lucifuge was ordered to send at least one member to join their Legion.

Neither Issei nor his Father had wanted to let his Mother go, so who would go would be between the two of them. To be honest neither of his parents had wanted Issei to go, but his Father was arguable less talented than Issei was, and when Issei revealed his durability technique they had eventually relented and agreed that he would be the one to go.

When the day arrived for Issei to leave, there were many tears shed and his Mother hadn't let go off him all day.

"Mum," Issei said patiently, stood in the hallway with his Mother clinging to his arm and his Father leaning against the wall, "I have to go now."

"They shouldn't be able to do this," Issei's Father muttered, fists clenched, "They sending you out there to die and we can't do anything about it."

"I know Dad," Issei replied, still trying to untangle himself from his Mother's arms, "But that's the way Hell is."

"I know Issei," His Father added, "But that doesn't mean I have to like it."

"True," Issei said after a moment as his Mother clutched onto her husband.

"My b-baby's going a-away," She sobbed, her husband rubbing her back soothingly.

"I'll be fine, Mum" Issei replied, before pasting a dopey expression on his face, "But you could have another? I'll be looking forward to seeing a little sister when I get back."

She giggled lightly before speaking through her sniffles, "M-maybe in a few cen-centuries, but you be s-sure to come ba-back safe."

"I will Mum," Issei replied, opening the door as he did so, "I can't die until I achieve my dream!"

"Will it give me gra-grandbabies?" She asked.

"Lots of 'em."

- E.P - E.P -

Issei was rather surprised at how simple the headquarters of the Lucifuge Legion were. There were some rather nice buildings in the centre, probably the quarters for the Lucifuge themselves seeing as they were walled off, but around that were little more than ramshackle tents and ordinary looking common Devils.

New arrivals were being directed to the largest tent and Issei joined the queue to enter. It wasn't exactly moving fast, the sheer amount of Devils slowly the process down, but eventually Issei arrived at the front of the queue where he was given a ragged bedroll, blanket and uniform, being warned not to lose them as they were property of the Legion, as well as directions to the squad he would be joining, Two-Four-Five.

It took Issei a little time to find his squad, the city of tents being laid out in no particular order, but when he did, he stuck his head inside the tent and hesitantly asked, "Is this squad Two-Four-Five?"

"Yeah," A scarred older man replied gruffly, "You one of our squad members?"

"I think so," Issei said, walking inside the tent fully, "My names Issei-"

"I don't care," The man grunted, abruptly cutting Issei off, "Come in, sit down and shut down. We'll do introductions when the last of you arrive."

The inside of the tent was pretty bare, four bedrolls set down with gear on top of them, with three of them currently occupied. The first was a woman with short blonde hair held back in a ponytail that appeared to be in her late twenties, although for Devils that meant very little, she could be a few thousand years old. Still she had a full figure, something Issei approved of as he swept his eyes over her, unless until he reached her face where her grey eyes were looking at him with disapproval.

The next two appeared to be fairly similar, a boy and girl about Issei's age both with green hair and brown eyes. They appeared to be much friendlier, the girl rolling her eyes when she glanced at the older man while the boy smiled good-naturedly. He was fairly sure that they actually were his age, most men didn't bother with age manipulation, whilst the girl's still developing figure meant that she actually was in her teens, rather than those women who looked fifteen but had massive boobs.

As Issei spread his bedroll in one of the gaps next to the green haired boy he surreptitiously eyed the older man. He had short black hair and a neatly trimmed beard with a rugged face although his looks were somewhat ruined by the scars criss-crossing bits of his face. After setting his newish gear out he sat down, not willing to break the silence the older man was enforcing.

Just as it started to get uncomfortable another person pushed their way into the tent. It turned out to be another older man, although this one had a much kinder expression in his blue eyes than the other. He had short brown hair and his own armful of gear in front of him.

"Squad Two-Four-Five?" He asked slowly, looking over each of the others in the tent.

"Yeah," The Black haired man replied, "You Hiisi?"

"That's me," The newcomer said with an unsure chuckle.

"Right, get in here," The oldest man said, the Devil called Hiisi doing as the older Devil ordered, "Now that all you commoners are here we'll do the introductions. I'm Sir Abraxan and you'll be calling me Sir from now on. I'm the squad leader and I'm excellent with elemental magics. Mara, you're next."

"Yes Sir," The blonde lady replied, before turning to the rest of them, "I'm Mara and I'm a career Legionary, I joined about half a century ago. I specialise in Earth magics and I'll be your go-to for any problems."

"Yeah," Abraxan interjected, "Don't bring them to me, I won't care. You with the green hair, you're next."

The two of them glanced at each other for a moment before the girl spoke up, "Well, I'm Kali and this is my cousin Vrykol. I'm good with elemental magics I guess."

"Like Kali said," The boy continued, "I'm her younger cousin Vrykol. I'm not particularly good with magic, but I'm pretty handy with my knives."

He brought up his arms and Issei noticed the short blades strapped to the underside of both of his forearms. They were fairly plain and looked to be about a foot or so long.

"Me next, eh," Issei said rubbing his head, "I'm Issei and, well, I'm fairly durable? That's really all I've got."

There was a snort of disgust from Abraxan, but he quickly gestured for their newest arrival to speak.

"Nice to meet you all," He began, "My name is Hiisi and I specialise in healing."

"Great," Abraxan drawled, "I've been assigned a bunch of incompetents. Aren't I the lucky one. Wait here while I talk to the Section Leader, I'll see if I can't get rid of some of you."

He stormed out moments later, the tent door flapping in his wake.

"Don't mind Sir Abraxan," Mara said after a minute, lying back on her bedroll, "He won't get rid of you."

"You mean he's really not that bad?" Issei asked, hoping it was the case.

"No, he's a prick," Mara replied, "But the Section Leader won't give a shit about him or us."

There was an uncomfortable silence after Mara said that, and it dragged on for a few minutes until Hiisi spoke up.

"I'm surprised you're all so young," He started, "Your parents really let you join?"

"They weren't too keen," Kali replied, "But both me and little Vry here have recently gained younger siblings, and we didn't want them to lose their parents."

"Little Vry?" Issei said incredulously, "He's like a foot taller than you are!"

"She still likes to treat me like I'm a kid," Vrykol added, then continued in an obvious whisper, "It's best to humour her delusions."

"Idiot," Kali responded, punching him in the arm playfully, "How about you Issei?"

"Neither of my parents has got any talent for magic, same as me really," Issei started, "But I've got one spell that makes me quite durable, so I'm more likely to survive than they are. Plus, they're my parents, I want to keep them safe."

"I imagine they'd feel the same way about you though," Hiisi said softly, pulling something out of his pocket and passing it over to them, "I know I do. That's my son and wife, and I'd do anything to keep them safe."

Issei looked the photo over as it was passed to him, a small child with Hiisi's brown hair but with brown eyes, the same as those of the young blonde woman holding the boy captured within it.

"Little tyke's always getting himself into scrapes," Hiisi continued, taking the picture back when they had all looked at it, even Mara, "That's why I'm so good at healing, having to patch him up all the time."

"Hm, you'll see him again soon enough," Mara said, finally deigning to join the conversation, "But we'd better get into uniform before Sir Abraxan gets back."

There was muttered agreement as each of them reached over for their gear, Kali and Mara disappearing behind a suddenly forming earthen wall to change. Issei quickly pulled his own gear on, black trousers and boots with a heavy long-sleeved top embroidered with the Lucifuge symbol in grey on the back, none of which fit particularly well but the worst had to be the top which seemed to be two sizes too big.

Seeing Hiisi and Vrykol were too busy getting changed to interfere, Issei sidled over to the wall and leant against it, preparing to peep round.

"Urk!" He choked out as someone grabbed his collar and yanked him backwards. Massaging his throat, Issei glared up at Vrykol smiling face and asked quietly, "The Hell was that for?"

"You were trying to peep on my cousin," Vrykol said, one eyebrow raised.

"Oh, yeah," Issei replied, pondering his dilemma, "You don't mind, do you?"

"She has got a nice arse," Vrykol admitted, releasing Issei as they both turned back to the wall, "Maybe I'll join you."

"You two are remarkably straightforward, eh?" Hiisi added, chuckling lightly.

"Pair of perverts, that's what you are," Kali grinned as she came out from behind the wall and struck a pose, "Like what you see?"

"Oh, yeah," Issei commented, running his eyes up her body, her uniform hugging her figure tightly.

"Mine is way too small," Mara grumbled as the wall crumbled away to reveal her, "Wish I could have kept my old gear."

Issei just drooled when he turned to her, her breasts pushing heavily against the material of her top, stretching it to its limits. They had an excellent size, Issei discerning eye noticed, just slightly larger than a handful and they were being compressed!

"My eyes are up here Issei," Mara added, crossing her arms and inadvertently emphasising her boobs further.

"But my attention is down here," Issei retorted, his eyes not moving an inch, "Could you jump up and down a little?"

"No."

"Huh," Issei sighed then removed his top and passed it over to her, "Mine's too big for me, why don't we swap?"

"One size fits nobody, eh?" Hiisi commented, plucking at his own slightly loose top.

Mara just gave a wry smile as she accepted Issei's top, placing her hands on the bottom of her own and pulling it up a little, revealing a few inches of pale skin. She stopped suddenly, eyeing Issei who was desperately trying to look nonchalant, then summoned the wall back into place.

"Nice try."

"Damn It!"

- E.P - E.P –

When Abraxan returned he informed them that the Legion would be moving out in a few days and that they had best not make him look bad in front of his superiors. After that he left again, apparently not willing to spend much time with those 'Low-Class Idiots' that he thought were beneath him.

Mara however, now wearing Issei somewhat larger shirt, took the opportunity to explain how the Legion worked and what they were likely to be doing.

"Well," She started, "There are two-hundred and sixteen squads in the Legion, numbered from One-One-One to Six-Six-Six. The first digit is the command you're under, One's are Lord Lucifuge's own, us Two's report to Lady Greyfia and the Three's to Lord Euclid."

"Isn't Lord Euclid only eleven?" Kali asked, "Why the Hell is he one of the commanders?"

"Nobles do things differently I guess," Mara replied with a shrug, "Anyway, Lady Greyfia's got her own section, Two-One, and squad, Two-One-One. The other sections are led by her subordinates, mostly high-class Devils although there are a few middles in there. Our Section Leader is Baronet Sothec, he's the guy Sir Abraxan went off to gripe at. Then there's us, squads Two-Four-One to Six, the cannon fodder at the bottom."

"Cannon fodder?" Issei asked, shifting uneasily.

"Yeah," Mara continued, "One on one, any Angel would be able to waste us. All of them wear blessed armour and can wield light spears, not to mention what any of the stronger Angels can do."

"So we're done for then," Vrykol murmured.

"Not quite," Hiisi said, surprising the others when he spoke up suddenly, "We may have the worst troops but the Fallen Angels have got the least numbers by far, not to mention the loss of Angelic equipment. As for the Angels, the Great Enemy has to create each of them so it takes them a long time to replenish their numbers. It's likely they still haven't recovered from our last push."

"Like I said," Mara added, an evil grin of her face, "We're cannon fodder."

That kind of killed the conversation.

- E.P - E.P -

The next few days the squad got to know each other better and better, except for Abraxan, who spend as much time as he could away from their tent. Each of them had demonstrated their magic, or in Vrykol's case his skill with his twin knives, and Mara had offered to help Kali improve her Earth magic.

Mara's magic in particular was impressive, she was quickly able to create thick walls or spears and she was apparently a good teacher as well, knowing where Kali was having problems and helping her out. She admitted that she didn't have much skill in other areas, then blew out a small fireball that was still larger than Issei's best, but that she could give Abraxan a bit of a challenge. In return Kali had offered Mara help with the other elements, something she had grudgingly accepted when Kali had shown her own strengths.

Vrykol had given them a demonstration of his skill that had quickly turned into more of a circus act as he juggled his knives and spun them up and over his body. It looked very impressive but losing control of one of the knives at the end and getting impaled in the foot by it had kind of detracted from his vaunted image.

Fortunately, Hiisi hadn't been boasting when he had spoken of his own skill and had easily removed the blade and patched up the wound. Vrykol was still walking round with a bandage on his foot and Kali had promised that she would never let him live it down. He quickly healed the few scrapes and bruises Issei had gotten from demonstrating his own technique, which mainly consisted of Vrykol hitting him and the others alternating between impressed or amused at the sight.

After one of the practise sessions Mara and Kali went outside to try to build a set of showers to clean themselves up, if you could count a couple of water magic spells and some earthen walls a shower. A couple of minutes after they left Issei turned to Vrykol, the three male low-class devils the only ones left in the tent, and asked,

"I'm going to peep on the girls, you want to join me?"

Vrykol thought about it for a moment, ignoring Hiisi's low chuckles before answering, "Sure, not like we got anything else to do."

The two of them crept out of the tent, being careful to stay quiet as Mara had ordered them not to peek on the threat of pain of, well, pain. Due to the placement of the squads' tents near one of the walls of the Lucifuge compound there was a section of ground that only their squad could get to and this was where the girls had erected their shower block.

It looked like a plain cube of earth, lacking doors or windows, although there must have been some vents on the top as there were a few wisps of steam floating up from the top. The two boys knelt next to one of the walls after circling the block looking for an entrance.

"Now what?" Vrykol asked quietly, being careful not to alert the girls inside.

Issei pondered for a moment, his intellect boosted by the thought of imminent boobs, "Pass me one of your knives will you?"

Vrykol did so and watched as Issei quietly tried to chip away at the walls, eventually creating a small hole. Seeing what Issei was getting at he drew his other blade and set about creating his own peephole.

Once they started looking through the new holes, and their eyes had adjusted, they were slightly disappointed by the amount of steam clouding their vision as well as the lack of girls.

"Were are they?" Issei muttered, face still pressed up against the wall "Vrykol, you see anything? Vrykol?"

Issei removed his eye from the peephole and turned to look at Vrykol, only to find he had disappeared. Hearing someone clearing their throat behind him, he turned further to spot the two fully clothed ladies of squad Two-Four-Five standing behind, Kali looking amused and Mara looking irate and a rather large earth club in her hands.

"Hello Issei," Mara started, moving forward, "I'd like a word with you..."

*Thwack* "Ah, the pain!" Issei cried, "Stop!"

*Thwack* "It hurts!"

*Thwack* "Argh!"

Issei waited a moment, before cracking open an eye and catching sight of Kali standing over him, "Is she gone?"

"Yeah," Kali replied, a sympathetic smile on her face, "The mean lady's gone"

"Whew," Issei muttered, quickly popping up from his foetal position on the ground, not showing any bruises from Mara's assault.

*THWACK* "Glurk!"

""I'm sorry, Issei," Kali said, her face now sporting an evil grin as Mara set about hitting him again, "I lied."

*THWACK*

"Hey, Mara," Kali called, "You got spare club?"

Mara paused a moment before handing over her own club and pulling another out of the ground beside her, "Sure."

*THWACK* *THWACK* "Argh!"

"THWACK* *THWACK* "This is remarkably therapeutic."