'This' - Artorias/Sif talking
'This' - Zhongli talking
'This' - Soul of Cinder talking

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-Y/N POV-

Right now I was standing in front of a huge doors that led to the wedding hall ready to bust them down and next to me was my new and last member of my peerage. How did this happen? Well, let's come back a bit.

~flashback brought to you by smol neko Kazuha in the box~

-Y/N POV-

I was sitting in the kitchen drinking coffee thinking what I should do on the wedding. It has been 10 days and today I got informed that Rias lost the rating game and the weddings will happen. Let's just say, I was not happy because I went for another walk. Just then a silver magic circle appeared and Grayfia appeared out of it.

Grayfia: Good evening Lord Y/N.

Y/N: Good evening Grayfia. And please drop the formalities, I'm not the fan of them.

Grayfia: Very well. I came here to inform you that the all the weddings will happen tommorow evening.

Y/N: Ok and?

Grayfia: Lord Sirzech knows that you're not happy with the situation so he wanted to give you this.

She then put a flier with a magic circle on the table and slid it to me.

Grayfia: He said that if you want to you're free to crash the party.

Y/N: Splendid! And tell him that I'll be bringing a member of my peerage to help me.

Grayfia: Understood. *creates a magic circle* Goodbye, have a good evening.

Y/N: You as well Grayfia. Don't get too wild while thinking about me.

I smirked when I saw her face develop a crimson red blush as she dissappeared into the magic circle.

~flashback end~

???: You ready boss?

Y/N: Always been Akaza.

Yes, it's that Akaza, from Demon Slayer.

(Author: God damn it. *picks up building materials*

*starts fixing the wall)

Anyway, how I met Akaza? Wellllll.

~another flashback brought to you by cute sleeping Yae~

I was walking though the woods killing any stray i saw and when i was beating the last stray, because i ran out of ammo, i saw a guy next to me, who I apparently didn't notice, beating a stray to death as well.

Y/N: Heeeey~

???: Heeey~. *quickly looks at him* What?!

Y/N: *kills the stray* Lovely night isn't it?

???: *stands up* Indeed.

Y/N: Wait I know that voice. Akaza?

Akaza: *steps into the light* Yup, wait Y/N?

Y/N: Hahaha! It really is you. How have you been?

Akaza: Been good, tho bored a bit. You?

Y/N: Same, tho I think I'm going to get married.

Akaza: Since when?

I then went with explaining to him everything from the meeting till what happened today.

Akaza: Damn. I pity you. Wait you have any pieces left?

Y/N: Yup, a rook. Why?

Akaza: I want to join in. I thought about the offer and decided to take it. At least I won't need to hide from the sun anymore and will be able to eat normal food.

Y/N: Then let's head back and do the ritual. Oh and be ready to possibly crash the wedding party.

Akaza: OHOHO! Now for that I can't wait.

~flashback end~

And that's how it went. We then reeled our fists back and threw a punch successfully breaking the door and sending it flying off it's hinges.

Y/N: SUP ASSHOLES. I CAME TO FIGHT FOR OUR FREEDOM!

-few minutes before, in the room   3D POV-

A few minutes before Y/N and Akaza made their entrance Issei being the dumbass he is he challenged Riser to a duel to free Rias, he surprised everyone when he activated his balance breaker. He would've won if he had 1 more second but his balance breaker dissappeared and Riser saw the chance and finished the fight. As Issei was taken to infirmary the ceremony continued.

Riser: Now that the problem is solved we can continue. But Lord Darkwood Riser must ask, where is your son. It's his wedding as well as he's marrying Risers sister.

He gestured to Claire standing next to Seraphina wearing a beautiful white wedding dress combined with the feathers of a Phoenix.

Agares: That I do not know, but I'm sure he-

He then was interrupted when the doors flew off it's hinges and one of them hit Riser straight in the face. As this happened Rias and her peerage, Seraphina and her peerage as well as Claire and Y/Ns peerage all snickered and tried to hold their laughter. Well. Except Izuku he was laughing his ass of rolling on the ground. They then heard the voice scream and they recognized the voice as it was Y/N.

???: SUP ASSHOLES. I CAME TO FIGHT FOR OUR FREEDOM!

Everyone looked towards the door they saw Y/N standing there in some type of armor without the helmet (Artorias armor) and next to him was standing a man who emitted demonic aura so they knew he was a demon. And a powerful one.

Riser: H-how DARE YOU!?

Y/N: WHAT? I CAN'T CRASH MY OWN WEDDING YOU CHICKEN NUGGET JR?!

Lord Phoenix: It's an important event for the devil race! How dare you try to crash it?

Y/N: Awww, Lord KFC is here too. *becomes serious* Listen, I'm here to fight for my, Seraphinas and Rias's 'tho for her unwanted' freedom so piss off.

Lord KFC: I cannot let-

Sirzech: I'll let it happen!

Almost everyone looked at him as he grew the 2nd head.

Sirzech: Yes the battle between the Phoenix and the dragon was entertaining.

Y/N: More like a lizard! That weakling nowhere near the power to have the title of the dragon.

Sirzech: Well then Y/N what type of battle do you want?

Y/N: I purpose a 2 v 2 battle. Me and my rook here and Claire and whoever she chooses from her peerage.

Many gasps were heard and devils started muttering between themselves but were interrupted by Lord KFC.

Lord KFC: YOU CANN-

Sirzech: SILENCE! Very well. Claire choose a person from your peerage you're going to fight with. If you accept the duel.

Claire: I do, and with me will fight my knight.

Sirzech: Very well.

-Y/N POV-

We then got teleported to the arena and across from us stood Claire and her queen but they had some kind of equipment around them and wore suits that showed their *cough* features.

Claire: Let me introduce you to my knight. This is Himekawa Hayuru my mutated knight.

Himekawa: Pleasure to meet you.

Y/N: Pleasure to meet you as well. My name's Y/N Cinder, and next to me is my mutated rook, Akaza.

He just nodded. We then heard Grayfia speak.

Grayfia: If all of the fighters ready then you can proceed.

-3D POV-

Himekawa didn't waste any time as she rushed at the duo with her sword with incredible speed that it seemed like she dissappeared and was behind them while Claire kept long ranged support with the 6 of her "batteries". Akaza then took a stance and proceeded to deploy his technique, Compass needle.

While he was deflectingthe shots, using shockwaves from his hits, from Claire 360° Y/N was fighting Himekawa and moving around the arena while occasionally dodging a shot or two. When they swords clashed they started to try to overpower each other.

Y/N: I must say, I'm impressed with your speed and swordsmanship.

Himekawa: You're not bad yourself. I would have mistaken you for a knight.

Y/N: *chuckle* Yes you're strong, but not good enough.

He then overpowered her and hit the sword out of her hands and was about to strike her but he had to dodge the attack from both sides so he jumped back and saw 4 blades floating around her. He rushed at her but couldn't get any closer because of the blades while she retrieved her sword and regrouped with Claire while the said girl kept the assault going. Y/N had to regroup with Akaza but as they were thinking of the plan the batteries started to power up a powerful shot from each as well as 4 blades and as they shot it. Akaza and Y/N tried to deflect them but couldn't and got sent into the wall behind them creating a huge dust cloud. The crowd of devils cheered except Y/N family who were concerned while his peerage kept neutral faces because they knew it isn't over yet.

Himekawa: Seems like we overestimated them.

Claire: Yes. But I must say the rook fought with great strength and technique.

Himekawa: Indeed.

The batteries and the blades returned to them and as Grayfia was about to announce a winner a laughter was heard. Everyone looked at the source they were shocked to see Y/N and Akaza walking out of the dust cloud uninjured.

Y/N: The attack was very impressive, it's strong, yes. But not strong enough. You think we should get serious?

Akaza: Hell yea!

The audience was even more shocked now. He stated that they weren't even fighting serious.

Himekawa: Y-you, you were mocking us?!

Y/N: What? No. Testing? Yes. Now Akaza prepare to finish the fight, I'll cover you.

Akaza: Understood.

He then deployed his technique once again but this time only branch with number "1" appeared and the rest started to appear clock wise. (I made that up) While from Y/N they heard something unexpected.

Y/N: Balance breaker.

???: Wolf Knight Balance Breaker.

The helmet appeared and covered his head while a big portal out of smoke appeared on the ground and a big wolf with a sword jumped out of it, and they took a stance.

To say that the audience were shocked was an understatement. Silence fell and it was finally broken by Agares.

Agares: WHAT THE FUCK?!? HE HAS 2 SACRED GEARS?!

Sirzech: You didn't know?

Agares: No!

Kuroka: It's because he didn't want you to know. *everyone looked at her* He actually has a 3rd one but it's not my place to say which one it is. All I can say that it's very powerful.

Emily: But this sacred gear, does that mean?

Kuroka: Yes. Your son is the elemental king along with being the new Wolf Knight of The Roundtable.

Everyone's eyes widen as they looked back at the arena and saw Y/N swinging his sword at Claire and Himekawa while they were forced to dodge and get away from him and Sif was protecting Akaza from any projectiles that went at him as number 10 appeared. As Y/N grabbed Claire by the wrist he strew her at Himekawa and before they could collide he appeared between them and and punched Himekawa in the stomach and kicked Claire and they flew and crashed into the walls of the arena creating the dust clouds. When they disappeared they saw Y/N in front of Claire with a sword to her neck.

Y/N: The fight is over, you lost. Surrender if you want your knight to live.

Claire looked behind him and saw that Akaza was standing in front of Himekawa ready to punch her and Compass Needle was deployed underneath him with a mini version on his fist as it was covered by huge air pressure. Plus she was exhausted and couldn't regenerate. Seeing that they lost she said

Claire: I concede.

With that the battle ended and they were teleported back as Himekawa was taken to infirmary as she didn't have Claire's regeneration and was hurt the most.

-Y/N POV-

When we teleported back the armor dissappeared and I was wearing a simple tuxedo. Claire stumbled forward but I caught her. Akaza helped me and we put her arms around our shoulders and helped her to the closest chair. She thanked me and we were then approached by Sirzech.

Sirzech: You have won what are your wishes?

Y/N: For mine, Seraphinas and Rias's engagement to be canceled and to never marry us to anyone we don't wish to.

Sirzech: Granted. And you Akaza? What do you wish for?

He looked down at the floor for a minute and asked Sirzech.

Akaza: Is it possible to resurrect someone.

Sirzech: As long as they died no longer than 50 years ago and you have the person's DNA then yes. (I as well, made that bullshit up)

Akaza: I do. I want my fiance to be resurrected.

Sirzech: Granted, follow me.

They left and i heard someone running at me. So I turned around and saw Rias, Seraphina and their peerage along with mine running to me. When she got close Rias jumped and hugged and tried to kiss me but before she could I grabbed her face and threw her off of me and onto the ground and she looked at me.

Rias: W-why did you?

Y/N: Why? Fucking why? I'll tell you. Because if it was not for you we wouldn't even be in this mess! If you didn't interrupt us back there then I would be either me or Sera fighting Riser! But nooooooo, your arrogant ass thought you could win!

I would continue but Kuroka hugged me and calmed me down a little. Riser then approached us.

Riser: It was great battle. Riser-

Y/N: OH CUT THE ACT ALREADY!

Riser: Ok! Damn! You don't need to yell!

Rias: Wha-?

Y/N: What confused? I'll tell you. I met Riser long time ago and after he confessed that he was in a arranged marriage with you and he didn't want to marry you we decided to act like that so there wasn't any suspicion on our plan to break the contract.

Riser: Indeed. And now I can finally marry the love of my life.

Lady Phoenix: Who?

He jumped a bit and turned around and saw his parents looking at him.

Riser: Yubelluna. I wish to marry only her.

I didn't want to stay any longer so I along with my peerage left to get Akaza and then left home.