A/N: Sorry, the update took so long. Wifi's been down for the past few days, so I didn't get a chance to upload the new chapters. Anyway, won't keep you guys waiting so here you go.

Later that same day, After Training:

Gremory Basement Floor #2, Ritual Room:

"The runic schemes on these are so simple and yet, they're written in such a way that even the slightest change could lead to disastrous consequences. And that's not even including the patterns written in Lord Beelzebub's unique runic language. I know he combined Lilithian and Divinitin using Enochian, but how did he do that without causing an explosion that could possibly destroy the Underworld? Also-!"

"Isaiah, stop analysing the pieces and let's get this matter done with before you actually destroy the Underworld." Venelana said with a sigh and I gave a sheepish chuckle as I nodded, Zeoticus and Sirzechs chuckling in the background.

"Are we sure he's not a descendant of a distant cousin of yours? Lufra, perhaps? He's always been such a devout member of his 'research' as he calls it." Venelana asked with an exasperated look and Zeoticus just smiled as he shook his head.

"I've tested him numerous times, dear. He has no Gremory blood." She just sighed as I smiled.

"So…I should just pour my demonic energy into the pieces and the runic schemes on the pieces should do the rest?" They all nodded.

"Yes, but before you do so, stand in the middle of the room please." Raising an eyebrow in confusion, I walked to the middle of the room right before a runic dome appeared around me. Turning to the adults, Sirzechs instantly pointed at his parents and Zeoticus just shrugged.

"Think of it as a precaution. You have both Sword Birth and Blade Blacksmith. We've had wielders of both Sacred Gears that were reincarnated High-Class Devils separately activate their pieces, but there's no telling how having both inside you will affect the pieces. As much as we know, it could cause a monstrous explosion that could wipe out all of House Gremory." Venelana explained from next to Zeoticus.

"…Fair point. Better to overestimate than to underestimate." I said with a nod and Zeoticus just smiled right before I took a deep breath and slowly began to pour my energy into the pieces. There was a few seconds of silence as purple energy slowly moved from my hands into the crimson case right before the Gremory crest appeared on top of it and instantly went to a bright crimson, nearly blinding me.

"Forgive us for not telling you about the flash!" I heard Sirzechs shout from outside the barrier and I just grumbled lowly, hearing Zeoticus' snickering right before the glow died down and I finally opened my eyes. The case was still in my hands, but the top was gone, revealing the pieces to me.

Lying on a crimson pillow were 15 pieces. All fifteen pieces were a bright crimson and the eight Pawns were in a row with two Knights, two Bishops, two Rooks and a Queen arranged in a row right above them.

The one that stood out the most was the Queen. It was a bright crimson just like the rest of them, except that violet 'veins' ran through the inside of it and a small purple glow was constantly pulsing around it.

"A Mutation Piece and a Queen at that? That's…very rare. In fact, the only mutated Queen Piece in devil history belongs to Serafall Leviathan. You keep on surprising us." Zeoticus said with a smirk and I grinned as I stared at the pieces, watching all 15 glow as the purple pulses slowly moved over the others. A runic circle appeared around Zeoticus' arm as he slowly ran it over all the pieces, probably scanning for any irregularities or faults.

Not that I think THE Ajuka Beelzebub would make anything less than perfect.

"Well, there aren't any problems with them as far as I can see so you can put them away." I nodded as a Gremory crest appeared in front of me and I pushed the case in, sending them to my pocket dimension.

"May I be excused?"

"Of course, dear. Please inform that daughter of mine that she still has those 'miserable' lessons with me." Venelana said with a smirk and I smiled and nodded, bowing to all three before I quickly walked out of the room.

Now that I have my pieces, I can finally begin with my gathering.

A Week Later:

"Hey, Reaping Raijus! How you guys been?" I shouted as soon as I exited the crest with a smile before I chuckled as I caught a familiar controller that was thrown at me.

"It's Kyoto Kitsunes now! And where have you been?! The last we heard about you was when your hot boss came to tell us that you were in hospital. What the hell happened?" Hisoka asked from where they all laid on their bean bags, Haru, Sado and Yazu all looking at me to give me a nod before they turned back to the screen.

"Yeah, I got ambushed by about a hundred or so assassins when I left you guys." I said as I logged in and sat in my bean bag, missing their looks of shock as they paused the game and turned to stare at me.

"…Say wha?" I chuckled at Haru's words as I shrugged.

"That's why I wanted to get away from you guys that night. They were tailing me for the entirety of the tournament, so I had to get away from any civilians that might get caught in the battle. Also, I wouldn't have been able to fight all out while I was protecting everyone, so I had to go outside the city where I didn't have to worry about anyone." They all stared before shrugging simultaneously, turning back to the screen and I chuckled as I joined the game.

"…You owe me six months." Hisoka said with a smirk as he held out his hand and I chuckled as the Gremory crest appeared on my hand before a briefcase appeared in my grasp.

"¥1,000,000. The ¥600,000 from the six months of absence and ¥400,000 as an apology fee." I said and he chuckled as he took it before quickly counting it all and dividing it four ways between the four of them.

"You're forgiven. Now, come on. We needed our Hawk-eye Newbie back." I just grinned as they finished the game with over 30 kills before we began a new game. You know what? Gaming with the boys never gets old.

"By the way, can you hook me up with that black-haired secretary of your boss? She looks cute." Hisoka asked and I raised an eyebrow as I smirked.

"You mean my girlfriend?" All four nearly choked on air as they turned to me, their eyes wide.

"…She's way too hot to be your girl. No way is that your girl."

"Indeed she is." I said, my smirk still on as I turned back to keep playing and all four slowly turned back to the TV, grumbling under their breaths.

"Good on you, though." Sado said from where he sat in the middle and I chuckled as I leaned over, bumping the fist he held out.

"Sado! We're mad at him!" They all shouted and he just shrugged, with them grumbling as they went back to playing.

"What about your boss? She available?" Hazu asked and I shook my head.

"Nope, she has a fiance. The biggest arrogant dickhead I've ever met, but I have to admit begrudgingly, he does have the power to back his arrogance." They all nodded as we kept on playing.

"Wait, isn't it a school day today?" I asked as I looked at the calendar. Yep, it's a Monday.

"Golden Week." I just raised an eyebrow at their unison answer before I sighed. Don't know what that is and I won't ask.

"Don't you have school?" Hisoka asked with a smirk.

"I have doctorates in Economics, Chartered Accounting and Micro-Biology. Why do I need to go to school?" I asked with a smug grin and all four just glared at me, grumbling as we turned back to the screen.

"Some guys have all the fucking luck." Sado grumbled.

"A-fucking-men, brother." The other three said in unison and I laughed, missing my shot as they just smirked.

Later That Day:

"See you guys next week."

"Sure! See ya!" The four of them waved over their shoulders and I chuckled as the Gremory crest appeared under me before I disappeared in a flash of red. However, I was not going back home. Since I had time before I needed to write my report, I wanted to do something before I leave.

Reappearing in front of a second-story house, I quickly cast an invisibility rune on myself as I floated up to a window on the second floor, looking into the room and sighing as I saw the porn posters on the wall as well as the magazines and games on the shelves.

Lying on the bed was a teen Issei Hyoudou, snoring his afternoon away. I smirked as a Gremory pamphlet appeared in my hand right before I slipped it through the window and used Wind Magic to create a small breeze to slowly let it land on his bedside table.

'One down and one more to go.' The next person's was a bit harder to figure out than Issei's, but a bit of Hypnosis magic to the right people and I managed to find it.

Disappearing in a flash of red, I reappeared flying above another second-story house, slowly floating down to the room at the back on the first floor and smiling as I saw the blonde haired teen doing work at his desk. Another invisibility rune hid me from view as I slowly floated into Saji Genshirou's room and hid another pamphlet inside his bag, slowly floating back out of the room and flying up high right before I teleported away.

Now, it's just a matter of waiting.

The Next Day:

"…So…was this Okita's idea?" I asked and Akeno giggled as she nodded, with me sighing as I laid my head on her lap and she ran her fingers softly through my hair. We were lying on a picnic blanket, lying in the shade of our large oak tree on Training Ground #2. Empty plates were packed into the basket we brought with us, with the bottle of non-alcoholic wine Venelana gave us completely empty and standing next to two glasses.

"So, where's your little entourage?" She asked with a smirk and I chuckled.

"A promise of buying three dozen Chocolate cakes if she let me have a few hours of silence and she ran from my sight before I could blink." She giggled and I smirked as I closed my eyes, Akeno humming a soft tune as the wind softly blew over us.

"This is actually the first time we're doing this." She said and I nodded, letting out a sigh of relief.

"Yeah, I've been wanting to ask Evelina to make a private dinner for us, but well, training and all." I said and she giggled. We sat there in

"So…how's being a High-Class Devil?"

"A bit tiring, but that's mostly because the amount of paperwork I have to do almost tripled."

"Want a bit of stress relief for that?" She asked with a teasing smirk, which I returned.

"Can you give a great massage because I don't think anything else will do." She just giggled as she rolled me with ease, with me now face down into her lap as she massaged my shoulders. My body shuddered involuntarily as I let out a soft groan of relief, feeling Akeno shivering as she felt my breath on her thighs. It was not long before I smelt a familiar strawberry smell.

"You...mhm~You know what? I think…ghn~I think I'm going to make you my personal masseuse~" I groaned out and she giggled softly as she slowly removed me from her lap and placed me face down on the blanket right before she climbed on my lower back and began the massage with earnest.

If what she did before was amazing, then the massage she was giving right now was nothing other than heavenly.

Dear Satan, I'm definitely hiring her as my personal masseuse the moment I can do so.

"Aw~ You poor thing. You're all wound up~"

"I~oh my Satan~I sure am." I nearly moaned and she giggled before I felt her hands disappear and she leaned forward, resting her large(for her age) chest on my back and moaning softly in my ear as she slowly rubbed them across my back.

"I swear, it's like puberty is running full steam in your body."

"Devil and former Fallen Angel. Both are creatures of sin and desire, so puberty is hell to me. Now, you left me dry for the past week, so you either start playing with me or I'm tying you down and doing whatever I want with you." I chuckled as I blitzed out under her before reappearing behind her, pinning her to the ground and she moaned as I rubbed up against her. I could feel her hips trying to grind against me and I smirked as my hand slowly travelled down, moving into her skirt and under her thong to feel sticky wetness.

"Well, who am I to leave you waiting?" I muttered into her ear and she gave a giggle and a satisfied, long-drawn out moan as I got to work.

Two Days before the fight:

"Hah…hah…hah…hehehehe, so…that's what you meant…by understanding Sandanzuki, old man." I muttered with a grin, staring at the tree stumps in front of me that was formerly the forest outside of Training Ground #3. They were no trees around as my new attack disintegrated anything that wasn't able to block against it.

'I'm still not happy with it, but I'm too tired to care for it now.' Besides, Akeno might notice I'm gone from the room and come try and find me. No need for her to spoil the surprise.

With a final sigh, I whistled as I picked up my shirt, Joker trotting towards me from where he watched me under a tree as Bardou was guarding Akeno in the room.

Two Days Later:

"I want a clean fight! No Sacred Gears, no swords, no bloodline or inherited abilities! Just your body, any Enhancement magic you have and your Touki! Am I clear?" Sairaorg, Alivian and I nodded and Okita nodded as he gave us glances.

Rias, Akeno, Koneko, Seekvaira, Sona, Tsubaki, Kuisha, Zeoticus, Venelana, Millicas, Grayfia, Evelina and Sirzechs' peerage were sitting on the sidelines under the shades of the trees of Training Ground #1, which was a giant clearing surrounded by monstrous trees with a barrier separating and protecting any spectators from the battle.

"Then begin." Okita shouted right before he disappeared and reappeared next to the others. I just grinned as Alivian slowly moved into a stance and Sairaorg raised his fists. Before I could speak, Alivian was in front of me, a knife hand coming down for a chop.

Blocking it, I grimaced as I felt the bones in my arm rattle before I jumped and drop-kicked backwards, hearing Sairaorg gasp softly before he chuckled and grabbed my legs. Raising me high above his head, he then tried to slam me down only to grunt as Alivian round-housed him in the face. His grip on my legs weakened and I took advantaged of it, falling to a handstand before doing a split kick.

Both blocked the attack, but they were not expecting the Gremory crests nor the blasts of winds that send them flying in opposite directions. They just flipped through the air and landed on their feet, both smirking as I flipped to my feet in the middle of them.

"So, any new moves you have?" Sairaorg asked me with a grin and I chuckled as I lowered myself to my hands and feet, my light blue aura appearing around me right before sparks began to run across my body and a translucent aura of blue wind slowly began to flow around my body. Sparking clawed gauntlets and boots appeared on my hands and feet respectively and my canines grew as my body bulked up significantly, ears and a tail made out of lightning appearing on me.

"Yeah, say hello to Storm Wolf Aura." Both he and Alivian looked shocked at seeing my transformation and I smirked.

Storm Wolf Aura was just a combination of Storm Knight Aura, my partial werewolf transformation that Lycaon unlocked and small amounts of my Touki pumped throughout my body in slow, repeated pulses to massively heighten my physical capabilities.

Sairaorg barely had any time to raise his arms in a cross guard as I blasted towards them at devastating speeds before my fist slammed into his arms and slammed him backwards, sending him flying into the barrier. I smirked as I leaned my head to the left, Alivian's kick flying past my head as I gripped it and kicked back with my left leg. Alivian jumped and lifted his left leg to block my kick with his shin before his eyes widened as I let go of his right leg and jumped, hooking my left leg around his before my right leg came around in an arc and smashed him into the ground.

Jumping away from Alivian, it was only a second before he jumped back to his feet, looking completely fine as he rolled his shoulders. A small scorch mark on the upper body of his black training gi was the only sign of me hitting him and I blinked right before I jumped back, Sairaorg's feet stomping down where I used to stood as he grinned. A small droplet of blood could be seen dripping from his forehead and he just smirked as he wiped it away.

"A partial werewolf transformation with Touki and Storm Knight Aura added to it? So this is the gift Lycaon left you, huh?"

"Yep." I shrugged, the sparks around me making the air vibrate and he chuckled before Alivian spoke.

"So any means of physical power is allowed, then?" He asked and we both nodded. He nodded right before a monstrous amount of Touki appeared around him, quaking the air around him as he smirked before he blasted forward and appeared above me. His leg came down in a devastating axe-kick and I just smirked as I quickly stepped back, the kick smashing into the ground.

A monstrous crater exploded into existence as a devastating shock wave smashed into the barrier walls. Surtr may have increased my durability considerably, but not enough to tank a full power blow from a devil that was formerly a dragon.

"…Now that's what I'm talking about!" Sairaorg shouted as his Touki appeared around him, just as dense as Alivian's as he blasted towards us. I just smirked as I parried a punch before Alivian appeared crouched besides us and snapped out a leg-sweep. Both Sairaorg and I jumped over it, not even stopping as we spun in the air and slammed a double axe-kick into Alivian's back.

That was the wrong thing to do as I instantly felt the pain of kicking something extremely hard, Alivian looking up with a wide grin before he roared and pushed our legs off. He jumped to his feet and blasted towards us, grinning widely as he tried to smash a double lariat. I ducked under his attack and Sairaorg took it head on, skidding back just a few inches before he grasped onto the arm and roared as he lifted the shocked Alivian into the air before smashing him back first into the ground. Both Sairaorg and I jumped away from away from Alivian and each other as we waited for him to stand up.

"…That's not bad." I said with a nod and Sairaorg chuckled as Alivian pulled himself out of the ground, dusting off his shoulders before he jumped to his feet and stretched. Ripping off the tattered remains of his gi's top, he rolled his neck before staring at us.

"That was a nice warm-up. Now, is this the part where we go all out?" He asked and Sairaorg and I grinned as the auras around us intensified.

"Yep! It is!/ Yep! It is!" A savage grin appeared on his face as draconic scales grew on his face and arms, his hands and feet turning into dragon claws and talons and two horn-like protrusions growing from the side of his head and curling upwards. He growled with a wide grin and Sairaorg and I cackled gleefully before all three of us blasted towards each other, a monstrous shock wave almost completely destroying the ground under us as we pressed against each other before our grins widened and we disappeared.

3rd Person POV:

With the others:

"This…is sparring?" Seekvaira asked with a shocked look on her face, everyone else looking surprised as Okita, MacGregor and Surtr chuckled/ laughed. Alivian, Sairaorg and Isaiah were barely visible as they blasted around the arena at breakneck speeds, not even slowing down one bit as shock wave after devastating shock wave destroyed the arena around them.

"This is tame compared to the bloody and monstrous battles those two have. They're just seeing how strong your Queen is and analysing his combat style before they truly begin to fight." Okita said with a smirk right before another explosion went off and the barrier groaned as Isaiah got thrown into it. He just cackled as he blasted back into the fight, nearly taking Sairaorg's head off with a kick that he barely dodged.

"…Alivian looks like he's having fun at least, so I supposed that's alright." Seekvaira said with a sigh and Okita chuckled before Rias snapped out of her shock.

"Keep on fighting, Isa! Win it for House Gremory!"

"Win the bout for House Agares, Alivian!" Both Rias and Seekvaira cheered with bright smiles before they glared at the other.

"Isa's going to win."

"No, Alivian is."

"Isa!"

"Alivian!"

"Isa!"

"Alivian!"

"Why am I friends with them again?" Sona groaned with her face hidden in her hands, Akeno and Tsubaki giggling as Koneko gave a small smirk.

"The little boy we saw in that hospital bed has grown into a terrifying monster, hasn't he?" Enku said with a smirk as the Lucifer peerage followed the fight with their eyes, already used to Okita's monstrous speed to be able to see them.

"Indeed he has. Almost a Satan-Class level fighter and he's not even 13 yet." Bahamut said and the others nodded before Sirzechs spoke.

"The birth of a new Super Devil…I wonder if I can fight him?" Everyone gave him incredulous stares, which he noticed as he just shrugged.

"I mean, fighting Ajuka and Diehauser is fun and all, but it gets a bit dull after the 50 000th draw. Also, he needs training in fighting different opponents. He's just been fighting close range fighters and I'm a mid- to long-range technique/ power fighter, so it could be fun."

"You have too much paperwork to slack off. Is that not why you chose MacGregor for that role?" Grayfia asked with a raised eyebrow.

"Ah, right. …Forget what I said." He said with a sheepish chuckle and Venelana and Grayfia just sighed as Zeoticus chuckled.

"Oh! It's getting good!" They all heard Okita say and turned back to the fight to see the three staring at each other. Bruises were littering their body and blood dripped from the corners of Isaiah's mouth, Sairaorg's head and Alivian's arms.

Back to the Fight: Isaiah's POV:

This…this was so much fun! Don't get me wrong. Fighting with Sairaorg is great and all, but even he admitted that our spars don't have that oomph, that feeling of deathly exhilaration it had from when we first began fighting each other. Now?

That feeling was back tenfold with Alivian thrown in the mix.

"So…who's ready to end this?" I asked with a grin, licking the blood around my mouth and Sairaorg chuckled as he wiped the blood on his forehead off before flicking it to the ground. Alivian had a few broken bones in his arms, but he was just chuckling to himself as he flexed his arm muscles. Both Sairaorg and I stared in slight awe as the bones shifted crudely back in place before a light green glow covered them as he healed them.

"My healing spells take too much demonic energy to use over and over during battle, so it's only a one-time use that I save for finishers." He explained to us and Sairaorg and I nodded, waiting until he was fully finished before we got ready to attack.

'Time to test out my new move.' I lowered myself back to all fours, my aura increasing to its max as a literal storm raged all around my body. My tail and ears grew to large proportions and the ground under me was getting charred from the dense sparks both appendages were exerting.

"Now, we're talking!" Sairaorg cackled as his Touki increased even further to its maximum before he condensed it around him, focusing most of it around his fists.

"This is fun!" Alivian shouted with an uncharacteristic monstrous grin on his face as a pitch black aura appeared around and merged with his Touki, forming a dark grey aura around him before it all condensed onto a single leg of his. It looked as if his leg was burning with grey flames as he got into a runner's stance.

"Regulus Impact!" Sairaorg punched the air with both fists, a shock wave of monstrous proportions ripping through the air towards Alivian and I.

"Darkness Dragon's Maw!" Alivian spun around on his non-burning at a blistering pace before he stopped and kicked the air as hard as he could, a black dragon's head spawning from his head and barrelling towards me and Sairaorg's shock wave.

Well, since they're using their final moves, I might as well.

I was grinning as I tensed every muscles in my body, focusing the speed of Sandanzuki throughout my entire body instead of just my legs. As their blasts came closer, my body itself began to vibrate, slowly at first before it began to rapidly pick up the pace. Soon, I was nothing but a blurry lightning werewolf humanoid, my eyes glowing bright blue as a neon-blue aura was around me.

'Sandanzuki: Piercing Fang!' As their attacks were about to touch me, they instantly dissipated into thin air, Sairaorg and Alivian looking shocked as I blasted straight through their attacks and appeared in front of both of them at the same time. They quickly raised their arms as best as I could to block, but...

That was their unfortunate mistake.

My entire body was vibrating as I blitzed right through them, passing through their bodies and coming to a stop in the middle behind them, staring at the shocked audience.

"Hehehe…this…is your win…rival." I heard Sairaorg mutter right before a thump echoed throughout the clearing as he collapsed face down, his Touki dissipating.

"So this…is…the strongest Youth…" Alivian muttered as he collapsed to his knees, his transformation dissipating before he fell, completely unconscious.

…I…I did it. I actually did. I finally beated Sairaorg.

"Hehe…hehehe…Hahaha….Hahahaha! Hahahahaha! Wooooohoooooo!" I shouted at the top of my lungs, feeling ecstatic beyond belief as I stared up at the purple sky of the Underworld.

"So this…is what victory feels like? It's…amazing." I muttered as my transformation and aura dissipated. I noticed Rias, Akeno, Tsubaki and Koneko rushing towards me, Seekvaira instantly rushing to Alivian and Sona and Kuisha rushing towards Sairaorg.

"Told you…I'd win." I muttered just before they wrapped me up in tight hugs and I groaned.

"Ow…broken. So many bones…broken. Muscles…torn," I gasped out, the girls hastily letting go as they looked me over, trying to find the most serious injuries.

"Hey…I'm…going to…collapse in about…five seconds…" I muttered out and Akeno smiled and nodded. I just chuckled as I gave her a chaste kiss before my energy disappeared and I blacked out.

A/N: And there's the one fight I've been wanting to write for a while. Yes, I know.

The abrupt reveal of Storm Wolf's Aura is a bit hasty, but you guys didn't think that training for six months in his mind-scape with Lycaon was just about Sword Birth and Blade Blacksmith, did you? The partial werewolf transformation could have been incorporated a little better, but I feel satisfied with it, so I'm leaving it as is.

Also, I know what everyone is thinking. Alivian shouldn't have lost that fight since he's higher ranked and a dragon, right? Well, firstly, the rankings are not the end-all-be-all. Just because you're higher ranked doesn't mean you win automatically. Secondly, Sandanzuki: Piercing Fang is a high-speed piercing attack that was created to pierce through those higher ranked with Isaiah. I'll explain in the next chapter how it's possible.

Also, some of you guys asked for a female Issei, but I'm sorry. If I do that, I'd either have to find outrageous reasons for most of the harem girls to find new love interests(I already have a new one for Rias that isn't Issei. You guys are going to hate me for this). That's why Issei's staying as a guy since I did say I wanted to keep Isaiah's harem at four maximum

If you needed to know the four:

Akeno: Already in it.

Tsubaki: Working on it

?: She's someone Isaiah's already met

?: Her hair isn't black, but to me it looked black when I first saw her so I'm keeping her as a choice. To help you know the list, all four have black hair(A slight fetish; ain't afraid to admit it) so that's a clue.

Anyway, yeah, next chapter is Isaiah's peerage gathering time, so be ready for that. Leave your reviews as always and I'll see you guys on the next chapter.

Until then…Ba-Bye~!