Y/N POV
Mindscape
I open my eyes and see i'm in a dark area with a small like peeking through slightly illuminating the vast empty land i stand on, turning around i see a black goo slowly take shape as it forms into a humanoid like figure that just stands theres staring at me till i hear a familiar voice "It's good to finally meet Y/N" the goo tells me as i recognize the voice as Blacklight's as he slowly comes closer. "Blacklight? Where are we?" I ask my sacred gear confused as the last thing i remember is fighting Azazel "We are in your mind, but we are not alone" he informs me as i hear deep heavy breathing behind me and turning around i See myy familiar Alucard glaring at me. "Fret not Master, We formed a contract so i will continue to serve you as part of you" he reassures me as i worried he would hate me for consuming him. "So what now, what do we do?" I question as they don't speak for abit be reciting something together
"In the darkness, we shall be your light
In times of doubt, we shall keep your faith
In times of rage, we shall hone your craft
In the midst of battle, we shall have no fear
In the face of death,we shall have no remorse
Fear not for we shall stay by you Y/N L/N as your protectors" Blacklight and Alucard tell me before disappearing and i leave my mindscape.
Real word
Waking up on a sofa i realise i'm in an unfamiliar place, i look to a door and see Azazel walk out of it and his expression lightens up "Kid your awake! I thought my place was gonna smell like dead bodies for awhile" he jokes as i sit up and he walks over. "So you feeling good?" He asks as i nod and stretch getting of the sofa "How long was i out?" I ask him as he looks at his wrist pretending theres a watch "well when you passed out it was morning and now the suns setting, so about 10 hours" he informs me as i nod and get up heading to the exit. As i grab the door handle he calls out stop me "Hey kid, I could really use someone like you on my side, whatcha say?" He asks as i shake my head "I do want to be stronger but i want to earn it" i tell him before heading out the door and walking to the ORC.
Timeskip
I arrive here as the sun has set and the moon has come out only to see a bright light and the sitri peerage holding a barrier over the school. "Hey Sona what's going on?" I ask as she turns her head and i see she has a serious look on her face. "Y/N i'm going to quickly open the barrier and let you in, Rias and her peerage need your help fighting kokobiel" she says as small pirtion opens and i run inside as it closes and i sprint towards were the others are gathered.
"Hey Kokobiel!" I call out as he looks at me and smirks "Ahh another one of Rias' pieces i asume" he says as i laugh slightly and he looks at me quizzingly "As if i'd be a part of her peerage" i tell him as Rias shoots me a quick glare and shouts "We don't have to be telling jokes!" She says as i equip my sacred gear in its blade form though its changed due to me absorbing Alucard, the edge of the blade is purple as a large purple gem resides in the middle. "You think i'm joking Rias?" I ask as she gets more angry and Kokobiel chuckles and descends "As amusing as your jokes are boy, are you here to fight me?" He asks spreading his 10 black wings. "Of course not" i answer gaining looks of confusion from everyone except Asia as for some reason she has passed out.
"I'm here to kill you!" I state changing my free arm to its armoured state and equipping my Balance breaker letting it form along my body starting between my shoulder blades and spreading across the rest of my torso before building up in my arms and legs. Then my helmet is created as a voice calls out "BLACKLIGHT BALANCE BREAKER". Kokobiel claps slowly before bringing his hands to there sides waiting for me to attack, We stand there as everyone just watches as our powet builds up between us his being grey while mine is purple and black. 'He's powerful but nowhere near as strong Azazel' i think as he gets tired of waiting and throws a light spear at me and i side step it letting it hit the barrier before he throws another one and i slice it with my blade arm and absorb the magic before i dash towards him faking a slice as he pre-emptively dodges as i grab him by the collar head butting him then trying to slice his face but he evades it most leaving a cut on his face giving me some magic and energy on to use my armouredhand and blast him with maguc sending him skidding back but i sprout my armoured wings to increase my speed and dash around him in circle creating afterimages and slicing and cutting him as he tries to retaliate. Quickly i change my blade arm into the whipfist, its changed to wear the blade on the end and a purple tip and a small gem of the same colour in the middle, and wrap it around him stabbing the blade into his shoulder slowly draining his magic and energy and renewing mine as i tosd him around slamming him into the the ground and walls alsp through trees, then jumping up and flinging him to the top of the barrier i slam him into the dirt creating a shockwave knocking most people over and kicking up a dust cloud.
With my arm still attached to him i keep draining him as he quickly lets out some light magic forcing me to let go, the dist cloud dissipates as he stands up with bruises, scratches and a hole in his shoulder i revert the my arm to its armoured state. "Hey Issei can you build up your boosts?" I ask calling out to him as he looks at me "yeah why?" He asks as i turn away and smirk under the hemet "because i know how to finish this" i tell him as i dash back to Kokobiel and punch him in the stomach making him bend over gasping for air, not wasting anytime i elbow him in the back of the head before grabbing onto two of his wings and pulling with all my might ripping them of as he screams in pain tendrils shoot out of me and i 'consume' the wings gaining more power. I grip his leg and dash towards the school slamming him through it, still holding onto his leg i fly out the roof breaking the ceilings and fly downward slamming him into the ground infront of everyone. Then putting a foot on his back i grip his leg with both hands and pull upwards hearing cracks a ripping i give ine powerful tug tearing of his leg of from his knee downwards, hollering in pain i 'consume' his leg and kick him away imbedding him into a wall not to far as i see the others stare at me with fear.
"Come on Kokobiel" i call out as i hear him cry in pain "You were so confident a moment ago, then i ripped your FUCKING LEG OFF" I finish in a menacing voice "GROW BACK YOUR LEG, SUMMON UP YOUR DEMONS!!! HIT ME! FIGHT ME! ... GIVE ME A HUG!" I tell him as he falls out the wall and looks up at me "...r-re-really...?" He asks as my helmet changes shape and adopts a demonic smirk with purple teeth as i pick him up by the hair and tendrils sprout out of me. "OH GOD NO!" he yells as the tendrils latch onto his wings ripping them from his body and i 'consume' them furthering my power as he cries and yells in pain as each wing in ripped of slowly one by one and i reel my left arm back as Issei's gauntlet calls out "TRANSFERS" as he touches my back and the power floods into me and a green glow outlines me. My armour becomes thicker and the edges are more jagged and the helmet sprouts up abit sporting a horn on each side if my head which is made of the purple gems that are on my armour.
As i get ready to 'consume' Kokobiel i hear a familiar voice in the sky call out "Thats enough!"
As i see a figure wearing white armour accented with gold trims with blue gems embeded in the armour and has glowing golden eyes a long tail like apendage and sporting Valis Divine Dividing wings.

I recognise this as Vali and toss Kokobiel away, "Azazel wants him alive" he tells us as he flies down to collect the now unconcious Fallen angel. "Who are you!?" Rias shouts out but Vali ignores her and turns to look at Issei "We won't fight today but soon we will see who the strongest dragon emperor is Issei Hyoudou" Vali states before flying away disappearing into the night.
Turn to everyone i feel something poking through my back as 3 more pairs of armoured wing form from the power i took from Kokobiel, deactivating my sacred gear it all disappears as i walk towards Shirone hug her much to her suprise "Are you alright?" I ask with concern laced in my voice as she nods slightly and i smile "Good Kuroka would kick my ass  if you got i hurt" i tell her as she giggles before i release my embrace. "What happened to Asia?" I ask turning my head to Rias as she looks away "She collapsed after learning that god is dead" she told me as i just nodded though she looked suprised at my reaction. "Xenovia how you holding up?" I ask her as she looks at me and smirks "I'm managing somehow, you on the other hand need to explain something to me" she answers as i cross my arms and smile back at her "and what would that be?" I ask "how mych where you hold back in our fight?" She questions as i chuckle before afterimages if me start appearing around her. "Does this answer your question?" I ask as she nods and i stop speeding around her and pick up Asia "perhaps we should go inside" i tell Rias as she nods and the rest of the ORC follow suit as Xenovia leaves.
Timeskip
A couple days after the Kokobiel incident everything returned to normal as the school was repaired and everything calmed down as we are all sitting in the ORC clubroom we here a knock on the door "Come in" Rias tells them as Xenovia opens the door walking in wearing the Kuoh academy girls uniform, "XENOVIA!" Issei shouts as i smack him upside the head and he holds his wound "Inside voice" i tell him before turning to Xenovia and holding out my hand for a hand shake and she accepts it "Welcome to Kuoh Academy" i tell her "I assume you've become part of Rias' peerage?" I ask as she nods and shows her devil wings "what class are you in?" I sk her as she retracts her wings "2-C" she informs me "When its time for classes follow me we're in the same one after all" i tell her as she smiles and goes to apologize to Asia for what she said i go to talk to Rias. "So Rias i assume shes a knight piece" i say to her as she nods "yes she is, having the wielder of Durandal will be quite handy" she answers as i shake my head "Still after only power pieces huh" i state as pouts "She asked to be reincarnated" she complains as i chuckle at how childish she is "So when you going to use that last rook piece?" I question as she calms down as puts a hand on my shoulder "That piece will always be reserved for you" she answers as the school bell rings and we head off to class.

(Lemme know what you think)