(2 Days Later)
Rias who was walking back and forth in the dorm. She was getting scared about this. Her mind was stressed out and she might pray that Y/n will understand it.

Y/n: hey Rias do you need something?

Rias: yes I need something please...

She pushes Y/n on the bed.

Y/n: what the!?

Rias: please take my virginity!!

She taken off her clothes with her bra and panties off as (Y/N) looks away nervously, but he felt her hand cup his cheeks in a very calming manner.

Rias: It's okay (Y/N), don't be afraid. I won't
be mad at you at all.

He slowly opens his eyes to see Rias' breasts causing his face to heat up with blushing, he felt her grab his hand to move it towards her breast making her touch it causing his hand to grip making her moan at that.

Y/n: Rias...not...now...

She was about to kiss him but a white light appears and a woman was there.

Grayfia: "Really Rias? You're here with-
*looks at (Y/N)**gasp*, you must be the
Y/n Sparda, Sirzech told me about. It's an
honor, I am Grayfia.

Y/n: Nice to meet you.

Grayfia: Rias, you know Sirzech will be
angry with you if he found out about this.

Rias sighs, she puts on her clothes back on.

Rias: sorry Y/n...

They left leaving Y/n confused.

Y/n: why is she acting like this? Never seen her being like this. Gotta figure out what's going on.

(Next Day)

It was the next day with (Y/N) still
thinking on why Rias acted the way she did
last night, but that was soon interrupted with
a fire appearing in the sky until it turns into a
screen revealing a male with blonde
hair.

Y/n: "Who's that?

Lumine: that's Riser Phoenix, the next head of the House of Phoenix.

Aether: "I really hate his guts.

Alice: that we can agree on. He's getting way overconfident.

Riser: "Attention students and teachers of
Aura, as you may know I am Riser
Phoenix; the next head in the House of
Phoenix. As you may know I am now getting
married soon to someone that I have been
engaged to for quite a while and now I
decided the wedding will happen soon.

Suguha: "NO!"

Asuna: "Why now? That fiend."

Sinon: "This can't be happening."

Y/n: What? What is it?" What's going in?

Riser: "I accept my marriage to my bride, Rias Gremory!!

His own eyes widen hearing her name
causing him to realize why Rias wanted to
lose her virginity to Y/n.It's because she's in a forced marriage with Riser Phoenix.

Y/n: Who does this asshole think he is?

Akeno: this was before you and your girlfriends arrived. Rias and Riser has a rating game if Rias wins she is no longer in the marriage anymore but Riser won which she's in now the force marriage part.

Y/n growls as he rushes towards the headmaster's office to speak with Sirzech.

Sirzech: yes Y/n?

Y/n: you can't save her!?

Sirzech: I'm sorry but I can't disrupt it. His power is too much with his immortality and regeneration

Y/n: you're like what a king or something but you're her older brother!! It's your job to protect her!! Rias birth my son!! Do you want to see her upset!?

Sirzech: no I don't wan her to be upset. I want her to be happy...

Y/n: then rise up Sirzech and let your soul grow!!

He felt dertmrmation was within his soul as he speaks to Sirzech on any plans.

(Underworld)

After Riser declared his marriage
to Rise everyone arrived at an engagement
party to celebrate, but for everyone from
Aura Academy it wasn't good for them and
Rias. They knew she didn't want to marry
Riser, but no one was able to stand up to him,
Riser appears in a suit causing everyone to
look at him with Aura Students looking at
him angry back in Earth.

Riser: Greetings renowned devils of the
Underworld and the people of Earth. On
behalf of the house of Phoenix, Riser would
like to thank each and every one of you for
coming today! This is an historic moment for
the world of devils, and I want our dear
guests to be the first to know. The two great
dynasties are about to become one, Lord
Riser of the distinguished House of Phoenix,
shall be wed by Lady Gremory of the illustrious
House of Gremory! And now *does a
presentation pose* I present to you. My bride,
Rias Gremory!"

She appears wearing a wedding dress as everyone looks, but that was soon interrupted with a group of Riser's guards being knocked through the door unconscious getting everyone's attention as they looked, someone walks through the door as the smoke clears and to Rias including everyone from Aura Academy is shocked, but smiles knowing who it is that walks through the door.

Y/N: can't have a party without the main guest!!

Riaz: Y/n!?

Riser: who are you fool!?

Y/n: Y/n Sparda, the boyfriend of Rias Gremory and father of Asura Gremory!!

Everyone gasped of hearing the Sparda name and shocked that Rias already has a child.

Riser: what impossible!! She never gave birth to any child from you!!

Y/n: Asura is from the future same with my daughter along with their caretakers.

Riser: the future you say? Then if I win then I'll have Rias be pregnant and your son won't exist anymore.

Y/n: how about I rip your guts and roast your worthless ass you dumbass chicken.

Riser: you dare insult Riser!?

Y/n: speaking in third person fuck me...I challenge you to a duel.

Riser: A duel, from a half breed? *laughs* You
think Riser is scared of you, half breed? You
think you stand a chance against me?

Y/N: You're pretty cocky for a chicken, are
ya?

Riser: What did you say?

Y/N: Do you agree unto the duel? Do you
accept my challenge unless you feel like
chickening out.

Riser: I- I'm not scared of you. Riser won
plenty of battles in my life in a rating game
and a one on one battle is no different. Riser
has the powers of a phoenix you see and you
won't stand a chance against me, you half breed.

Y/n: me? Oh no I'm part human, part demon and 50% angel.

Riser: an angel!?

Y/n: come on!! Fight or be a chicken.

Riser growls and steps down to the floor.

Riser: so hybrid you'll accept the conditions?

Y/n: what are the conditions?

Riser: If I win the marriage will continue and you'll be my personal butler for your life.

Y/n: if I win the marriage is over, you'll no longer be marrying Rias forever and I'll have your peerage I sense hidden potential in them because you failed to get them stronger!!

Riser: deal.

Everyone was teleported to the Phoenix Arena. Y/n summons out his sacred gear. Eyes were widen as they all felt the powerful energy within the gear. Y/n shot energy balls at Riser who taken damage but regenerated.

Riser: foolish boy.

He throws a large fireball with using his creating a explosion. Y/n had some burn backs but he rushes towards Riser and throws punches/kicks as Riser did the same.

Y/n wasn't doing good. His body felt weaker by the moment.

Rias: Y/n?

Y/n: my body!! What's happening!?

Riser: what's wrong boy? You're slipping!!

Y/n: shut up!!

He transforms into his devil trigger. He quickly takes out Rebellion and swings upwards damaging Riser's clothes and slashes his body. But it heals him as Y/n takes out Ebony and Ivory rapidly shooting barrages of bullets.

Y/n: I'll make sure you're suffering more!!

He takes out Yamato and did a small judgement cut. But he revered back to normal.

Y/n: ugh my body what's happening?

He shot 7 ki blast to Riser but it did barely anything.

Y/n: dam gotta use this KAIOKEN TIMES 4!!!

His shirt was ripped off showing his body causing many females blushing. He blasted to Riser with a hard punch sending him crashing to the wall. Y/n uses dragon shot to damage Riser which hits him and caused a explosion. The kaioken stops and Y/n drops to his knees.

Y/n:....fuck...that hurts...

Riser: not bad but you can't fight back now. I win...

He laughs as Rias looked at Y/n's body with tears.

Rias: I'm sorry that you lost but you did good Y/n.

Y/n began to see Asura crying as his body was designating. He hears Mundus laughing at his friends, girlfriends and family's dead bodies with his son.

Y/n: no...

Riser: what?

Y/n got up as his rage increased.

Y/n: I'm not going to lose my FAMILY!!!

He screams very loud. Everyone heard it it reached towards Earth and everyone including Aura Academy heard his screams. His hair turned yellowish, his eyes turned pale blue green.

Y/n: if I can turn super saiyan then I can combined it the scail mail!!

He charge up his demonic power as he summons his gear and transforms into the scail mail form.

Y/n: power..I can feel it flowing!! Plot armor is with me!!

Riser: what plot armor!?

Y/n: get grounded!!

He grabs Riser's face and slams him to the ground. He flies up to the air and charges up a dragon shot with big bang attack. He shot it and caused a huge explosion. He flies straight down and rapidly punches him. His regeneration wasn't fast enough.

Y/n: oh I've been waiting for this!!

He whistles and Saber, Jeanne, Jalter, Mashu, Archer, Rin, Shirou and Sachi taken out their weapons and attack Riser with all of their might.

Jalter: maybe after this I'm gonna eat some chicken for dinner!!

Jatler then stabs Riser's stomach causing him to scream in pain. She grins and pulls out her sword and licking the blood off as some of the blood was on her face.

Jatler: tasty like chicken.

They stopped as Y/n takes a bottle with a cross on the glass. He takes off the lid and pours it all over Riser.

Riser: what is that?

Y/n: or something that demons fear...holy water.

Riser: what!? GHAAAAAAAAA!!

He screams in pain. He slams his hands in the ground to make the pain stop. Y/n summons out Beowolf gauntlets and punches Riser very hard.

Riser: GRRHHAAAA!!

Y/n: Rias never loved you at all.

PUNCH!!

Y/n: you failed to have your peerage to get stronger.

PUNCH!!

Y/n: you failed yourself as being.

Everyone jumped back as Y/n changes a holy energy ball. He was about to throw it but Riser's younger sister Ravel stopped him.

Ravel: stop!! He already had enough.

Y/n: get out of the way woman or your fate is sealed with your brother.

Ravel: he's my brother!!

He looks at Ravel's eyes and sees the flames burning within her soul. He sees a vision of himself or another version of himself being a monster killing everything and everyone. He sighs and the energy ball was gone. He deactivated super saiyan and scail mail.

Y/n: you are worthy of being the heir of your family. Be strong don't let anything or anyone hold you down.

Riser: I...yield...

Y/n: good little chicken. I'll be leaving now.

He and the group along with Rias left the arena. Ravel looks at Riser and sighs.

Ravel: Riser just stop and rethink everything you did in your life.

Riser: okay sister...

End of chapter