Intro:

- Y/ns pov -

I woke up feeling kinda groggy as usual, it was a pretty long night last night, seeing as I'm constantly smothered by my harem, I looked to my sideseeing nejire, she had her grey pajama shirt on but the rest of her was actually completely naked...guess we must have had some "fun" last night..

On my other sides where tohru and gray, all in similar clothes to nejire, I sigh and look to the table at the side of my bed to get my phone.

I checked the time on my phone and saw that it was 8:30 in the morning, it seems that I've overslept a bit.

I moved the blanket over nejire as to keep her warm as it was a bit chilly and to cover up her exposed areas, she smiled in her sleep as I did so and I hugged her and kissed her cheek as I got up very quietly as to not wake up the girls.

then I opened the door and made my way down to the kitchen to make breakfast.

but as I got down I saw my mother, already sitting down by the kitchen table making a cup of tea.

Y/n: oh, hey mom.

Magi: hi sweetie, sleep well?

Y/n: yeah..kinda.

Magi: ah I see~

Y/n: no wait i-...*sigh* yeah it'd exactly what your thinking...

Magi: mmh..Well I hope you had fun.

Y/n: mom!

Magi: okay okay, sorry.........did you wear protection?

Y/n: yes!....I think.

Magi: well then if you didn't, at least you two would have some adorable babies~

Y/n: okay I'm gonna go get dressed!

I said loudly with frustration as I walked into the bathroom to get dressed.

- no ones POV -

location: Union academy, principals office.

All of the headmasters where sat at a large round table, discussing their current predicament Involving y/n.

All might: I cannot believe it..young y/n has returned..

Ozpin: and not only that, but as the most powerful being in the entire multiverse.

Azazel turned to nezu and smirked while nezu smiled in response, they where both happy that y/n was alive and well.

Ozpin: so what do we do? Our original plan was to bring him back to union, but it does seem that he has no intention of doing so..

Sirzech: he WILL join rias' peerage and become her servant, then he won't have a choice in the matter, and union will become more powerful than ever!

Ironwood: and those technological advances that he has made are nothing short of astonishing! Just imagine what we will be capable of with that kind of tech! He will Hand it over whether he likes it or not and atlas will use it for further advances with out technology.

Nezu: *sigh* but how do you expect to get him here? He definitely won't want to come here willingly. And he has shown to be far more powerful than all of us combined..so please explain.

Sirzech: that was just bad timing, the only reason he beat us is because we where all already injured! we have already located them, due to tracking the students hero costumes and the Quirk used by the villain kurogiri, we will send out a group of our forces to detain him and bring him here!

Azazel*mind*: jeez are these guys braindead!?

Nezu: *sigh* honestly....

Ozpin: and if those plans fail, we will send the entirety union if necessary!

All might: so it's settled then..tell rias and her peerage to get ready for a mission, make y/n a part of her peerage and bring him here as a student of union academy!

They smiled victoriously while nezu and azazel sighed and looked at them all with unmeasurable disappointment.

- back with y/n -

Y/n was standing in a field with his friends from union. Y/n was wearing a brand new outfit

It turns out they wanted to have a sparring match with y/n to test out how strong he's gotten.

Y/n: so, you guys sure that you wanna do this?

Kirishima: yeah dude! I wanna see how much you've improved!

Y/n: *sigh* alright then, just make it quick okay? I promised my little girls I'd play hide and seek with them.

Ruby: aww thats adorable!

Deku: yeah, i still think its a little crazy that you have three daughters!

Y/n: well, I was there for them when no one else was, so I decided to make them officially part of the family.

Kirishima: so manly!!!

Y/n: eheh...so shall we get started?

Kaminari: hell yeah!

Jaune: let's all try our best!

Gasper: y-yeah!

Y/n: okay then!

He said with a smile on his face as he got into a fighting stance. And everyone else did the same.

He shifted two fingers back and forth signalling for them to come at him. Izuku was the first to attack as he activated one for all: Full cowling 10% and punched him point blank in the face. Yet he wasn't fazed at all by the punch and he casually flicked izukus head, sending him flying across the land with ease.

Y/n: ooooh! Yo deku! You alright?

He didn't hear a response.

Y/n: eeehh, I'm sure he's okay..right?

Kirishima and jaune where next, they both lunged at y/n and landed a punch to his face, but just like deku it did absolutely nothing.

Y/n fired a tiny ki blast at jaune, sending him crashing down next to deku, kirishima was barely able to avoid but just as he got his balance..

Y/n: haaa!!

He shot a blast of flames towards kirishima, but it was more of a defensive blast as it sent kirishima skidding into a tree, obliterating it to nothing but splinters.

The whole group was looking at them, astonished..yest still not too surprised.

Kaminari: I don't want to sound like a wimp right now..but I think we've seen enough.

Mina: yeah, and I don't wanna die today.

Rossweisse and Asia: same here!

Y/n: ah.....I guess that's it then..

But suddenly hedwig just flew towards the group, screeching.

Y/n: huh, hedwig and mew?

He extends his arm out and they both landed on it.

Y/n: what is it ?

A strange green aura surrounded both hedwig, mew and y/n as it seemed that he was speaking to them telepathically while he closed his eyes.

After a few seconds y/n opened his eyes and sighed, then he looked at the rest of the group.

Y/n: god dammit...

Kendo: hm? What's up y/n?

Y/n: some certain devil trash are currently trying to break through the barrier..

Ruby: the ORC? What do they want

Y/n: take a wild guess...

Ren: they must be Fools to come here, and to think that they would win a battle and get you into her peerage.

Tetsutetsu: god dammit!! Those power hungry bastards!!

Kisirhima: how could someone be this much far away from manly!?

Y/n: I might as well go and handle them.

Shinso: do you need any help?

Karma: I doubt it.

Tohru: yeah! My y/n could easily take down those evil devil parasites without any effort at all!

Y/n: *chuckles* thanks for the encouragement tohru.

He places two fingers on his head and instant transmissions towards the destination of the ORC.

Outside the morgiana Mansion, rias and her peerage where desperately trying to penetrate the barrier and breach the shield to get to y/n. Yet still after all those attempts they still fail.

Rias: damn it..why won't this damn barrier break!?

Issei: heh, don't worry rias! I can get it open!

He activates his balance breaker and rammed into the barrier with all his power, yet it did absolutely nothing, there wasn't even a scratch.

Issei: grrr what!? How!?

Y/n: *sigh* really issei? Still trying out the same old tricks? How disappointing.

The ORC noticed y/ns arrival, he was standing behind the barrier on top of a tree.

Issei: Hey! How are you doing this?! There's no way a weakling like you could make a barrier this strong!

Y/n: pfft, only a moron like you would believe such claims..now can we make this quick? I was about to spend some time with my daughters

Kiba/akeno*mind*: wait, y/n has kids!?

Rias smirked and stepped in front of everyone and pointed at y/n while speaking triumphantly.

Rias: y/n morgiana! I demand that you surrender yourself to me and join my peerage! And your girls will join isseis harem!

Issei got a pervy look on his face as he imagined what he could do to y/ns girls, while y/n had a deadpanned look on his face.

Y/n:*mind* is this devil slut braindead!?

Y/n:.........no

Rias: "no"!? You would dare refuse me!? I am the heiress to the house of gremor-

Y/n: oh fuck off with your "house of gremory" bullshit! You stupid, pathetic devil slut! Your claims mean nothing!

Issei: hey!! How dare you talk to president like that!!

Rias: fine then! How about a little deal?

Y/n: hm?

Rias: you face off against my peerage, if we win, you have to join my peerage and your girls join isseis harem! And if you win, we will leave you alone.

Y/n: hmph...fine..

Rias smirked once again and flew behind her peerage like the coward she was, allowing them to do all the work.

Y/n walks through the barrier and stands in front of the devils, waiting for them to make their move.

Y/n: whenever your ready...

Issei: prepare to lose weakling!!

He activates his balance breaker and shoots towards y/n at full force who just extended his hand out casually.

Issei: what!? Grrrr dragon boost!!!!!

BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST
BOOST BOOST BOOST BOOST BOOST

issei charged up all the energy he could all at once, this caused his to transform into his juggernaut drive.

Issei: haaaa!!!!! Try this on for size!!!

Y/n: *sigh* such great power..wasted on such pathetic beings...

Issei raised his right hand and threw It down onto y/n.

Issei smirked, thinking he destroyed y/n easily

Issei: ha! I knew you where still wea- GAAAAAAH!!!!!!

All of a sudden, isseus hand completely shattered, causing metal, magic and blood to splatter everywhere, shocking the ORC.

Rias: ISSEI!!!!!!

Xenovia: what on earth!?

Akeno: how is that possible!?

Y/n: because he's weak, that's why.

They all turn their head to see that y/n was standing behind all of them with a casual look on his face, ad if nothing had even happened.

Rias: tch, EVERYONE!! Throw everything you have at him!!

Akeno: with pleasure~!

She flew upwards and charged up her lightning, preparing to electrocute y/n.

Akeno: I cant wait to hear you scream y/n~

Y/n: pfft you wish..

Y/n got a cool idea and he summoned a weapon with his magic.

It seemed to be a long handle for a blade, he spins it around and activates it
While he gets into a fighting position.

Akeno: oh, do you really think that little staff can protect you?

She then shoots her Lightning at him, but y/n held it out towards her and spun it around rapidly, it ends up completely
Reflecting it back at her.

The blast put her body through agonising pain.

Akeno: GAAAAAAHH!!!!!!!!

Xenovia: akeno!!

Xenovia and kiba both stepped in front and summoned their weapons.

Kiba summoned his Excalibur and pointed it at y/n while glaring at him.

Xenovia summoned two smaller blades got into a fighting position.

Koneko pounds her fists together and rias charges up her P.O.D to destroy y/n.

Y/n: tch, seems like the gremory peerage still needs one last lesson...

Koneko rushes forward towards him and tried to punch him but y/n spin  kicks her in the face before she could land an attack, sending her flying into the trees.

Kiba: haaa!!!!

Kiba charged at y/n and slashed at his back with his Excalibur, but it completely shattered on impact.

Y/n: hmph, weakling..

He swiftly turned around and punched kiba in the stomach, sharpening his ribs and damaging his organs.

Kiba: GAAAAAAHH!!!!!!!!!!!!

He was thrown into the air, and his broken body slammed into the barrier, coating it in blood.

Xenovia charged towards y/n and swung her blades at him, but he countered and drew his double bladed lightsaber and blocked all her attacks.

Xenovia: this is your last chance y/n! Join us or we will force you to- gah!

She was cut off by y/n elbowing her in the face and disarming her by throwing away her blades.

The impact of the hit was so great that it completely knocked her out as she was sent back.

All that was left was rias and an already injured issei.

Rias: grrrr I will not stand for this!! I shall not allow you to dishonour my family name with this disrespect!!

Y/n: disrespect..? DISRESPECT!?!?

Rias:tch!

Y/n: KAIO-KEN!!!

he flew towards her and attempted to throw a large punch to her face, but Issei got in front of her and took the punch.

The attack completely shattered isseis armour, sending him to the ground in an enormous crater, nearly unconscious.

Issei: n-no....I still need..t-to become...the harem king!.....

Y/n: shut the fuck up already...

He kicked issei with barely any force, but it still caused a huge shockwave and knocked issei out.

Rias: my pawn!! HOW DARE YOU DO THAT TO MY ISSEI!!!!

she charged up her power of destruction and chucked it towards y/n.

Y/n: *sigh* what let down....FULL COUNTER!!!!

He swung his lightsaber at the blast and it shot right back at rias.

Rias: w-what!? No! NO!!!!!!!

she tried to fend off the blast but to no avail as it completely overcame her, she was burned, bruised and bleeding.

Rias: h-how..!?

Y/n: I've said it before you weak bitch.. I'm stronger than you will ever be...

Rias: i-....I see... very well then..

She grew a face of sadness as she tried to stay standing.

Rias: I guess...that this is it huh?..

Y/n noticed malucious intentions coming from her, and something glowing in her hand.

Rias: ha!!

She then shoved the glowing object into his chest and a dark glowing black and read, it was revealed that she was holding a rook piece and she put it into him.

Y/n: GAAAAAAH!!!!!!!!!!

rias smirked and yelled out with excitement.

Rias: yes!!! Finally! Now you shall be reborn into my peerage!! Rejoice y/n! For you have been given new life as a devil And prepare to serve your new master!!

Y/n: AAAAAAAAAAAAAAAA!!!!!!!!

rias smirked, thinking that she had won. But y/n suddenly chuckled and looked at rias with a cocky expression.

Y/n: heh...and THAT..is acting..

Rias: W-WHAT!?!

Y/n: and thanks for the devil energy by the way!

He held the rook piece in his fingers, between his thumb and his finger, and he flicked it towards rias, whacking her in the face, knocking her out.

Y/n: hmph, pathetic...yo kurogiri!

Suddenly kurogiri showed up through one of his warp gates, in his bartender outfit.

Kurogiri: yes master morgiana?

(A/n: kurogiri, like tohru, is a caretaker of the morgiana household, he's like Alfred the butler from batman, and cleaning the mansion gives him something to do all day.)

Y/n: warp them back to union, and deliver a message while your there okay?

Kurogiri: of course.

He spreads his portals to each of the gremory peerage members and sent them all back to union.

Y/n: well, that's that.

Anya: papa!

Y/n turned to see all his friends, his mentors, his harem, his mom and his daughters.

Ruby: that was awesome y/n!!

Tohru: I told you my y/n could do it!

Madara: heh..just as I taught you y/n..

Magi: I must admit tou did a fine job with disposing of those devil pests.

Shigaraki: those brats really never learn.

Dabi: huh...kinda reminds me of YOU tomura..

the LOV and some of y/ns friends and even his mentors snickered at dabis comment, while shigaraki just growled in anger.

Shigaraki: shut up...

Y/n smiled at seeing everyone having fun, even former enemies where enjoying theirselves in this new land.

His daughters run up to him and he picks them all up and cuddles them.

Kanna: papa can we play now?

Hinami: yeah papa! We wanna play hide and seek!

Anya: please papa!

Grey and nejire walked up to y/n and helped him hold his children, nejire held anya and grey held hinami.

Nejire: aww come on y/n, we can't keep the little ones waiting, now can we?

Grey: yeah~

Y/n: heh, alright then! Come on girls  let's go!

He teleports himself and his girls to the back garden to as hide and seek.

_____________________________________

Location: Union

In the medical room, rias and her peerage where laying in bed, with machines wired up to them.

Sirzech was standing in the room, absolutely infuriated by the aftermath of the ORC s battle with y/n.

Sirzech: THAT DAMN BRAT!!!!

a dangerous aura surrounded him as he glared at recovery girl who was on the other side of the room.

Sirzech: what are you waiting for woman!? Heal them dammit!!

Recovery girl: did you not hear me the last time? I refuse to hear them after what they di-GACK!

Sirzech grabbed her by the throat and lifted her up.

Sirzech: I said DO IT!!!

recovery girl: n-never..!

Sirzech: GRRRR THEN YOUVE ASKED FOR IT!!!

He strengthened his grip and suddenly.

He snapped her neck and used his power of destruction to disintegrate her body entirely.

Sirzech: that boy will pay for what he's done!!

He storms out of the room and makes his way towards the headmasters office to discuss the next course of action.

Bakugou was walking through the corridor as this occurred, and he witnessed sirzech murdering recovery girl.

Bakugou: w-what the fuck!? Recovery girl.....

- with the headmasters -

Sirzech, ozpin, nezu, ironwood, all might And azazel where sat at the table, discussing their next move.

Ozpin: sadly it seems that our plan has failed..

Sirzech: YOU THINK!?

azazel: zechs!! Calm down!

Sirzech: HOW DO TOU EXPECT ME TO CALM DOWN AFTER WHAT THAT BASTARD DID TO MY SISTER!?!?

nezu: to be fair it was YOUR choice to send the ORC...and we tried to warn you of what y/n was capable of...

Ironwood: it doesn't matter now! Rias and her peerage are gonna get the best treatment there is, they should be fixed up in around a week at the latest with the atlas technology we having available We have already planned everything  already, its clear that just sensing one squadron won't do enough damage..so we've decided to throw everything we have at them!

Ozpin: indeed..

Nezu: what!?

Azazel: your telling me your gonna put students in that much risk!? Even heroes won't be enough to stop them!

Sirzech: your opinion doesn't matter azazel!! We've already made the decision!!

Azazel and nezu where sat there silently, they felt sad that they couldn't do anything to stop the upcoming war...

And outside, behind a slightly open door, bakugou was easedropping on their conversation.

Bakugou: what the.....*sigh* dammit....

*flashback*

It wasn't long after the ORC *killed* y/n, bakugou was talking with rias and he seemed seemed be very pissed off.

Bakugou: what the fuck gremory!?

Rias: hm?

Bakugou: why the fuck did you pull that Shit!?! You said we would get a little payback, and rough him up a little bit! You never said we would kill him!!!

Rias: and why would you care? He was just a weak bastard who needed to be made an example of..

Bakugou: fuck off!!! I never singed up for that!!

Rias: heh, and what do you intend to do about it katsuki? My brother is the headmaster..any statement you would give would be brushed off no problem, plus they would approve of what we did today..so just get over it.

She walked away, leaving katsuki to look down at the ground, lissed off and disappointed in himself.

Bakugou: what...have I done...?

*flashback end*

With y/n

He was in the field with his daughters,playing hide and seek with them.

But as he was searching for them a strange sensation ran through his body causing him to completely freeze and fall to his knees.

Y/n: w-what is this feeling..?

TO BE CONTINUED......

And this brings the beginning of the revenge arc.

The war between y/n and union.