(Y/n) Your name
(L/n) Last name
(H/c) Hair colour
(E/c) Eye Color.

(A/n: For most of this, I will refer to the reader as he as I will be narrating it. When it switches to 1st person though it will be I when referring to them)

(Kuoh Japan early in the morning)

A teenager with (H/c) sat on top of the roof of his house as he watched the sun rise in the distance. He was calmly staring into the golden coloured sky as he flipped a coin that was within his right hand. The coin was golden in color and on one side had an X while the other had a (first letter of first name) on it. (Also your in the Kuoh academy male uniform but you have gloves on as well)

He caught the coin in his gloved hand as he looked at it before he stood to his full height. (How ever tall you are.)

Walking to the edge of his roof, he saw a small bundle of black and purple energy flow off his left ring finger. Looking at a small golden ring on his hand. The teen smiled as he jumped off his roof and landed on the ground without making a sound. He turned towards the open back door and walked inside. He went upto his room. He stopped and looked at a photo on a wall to see his family. He looked down at a small plaque that read.

"Our small but wonderful family"

Smiling he walked into his room and saw a large lump under the sheets of his blankets. Staring blankly he saw the clock next to his bed had 7:00 on it. Shaking his head side to side, he walked over to the bed before pulling the blanket off. He sighed heavily as he saw a girl sleeping in his bed with waist length brown hair. She had her head on her hands as a perverted smile as a small drop of blood trailed down her nose.  The teen shook his head before he shook her awake.

(Y/n P.O.V) (Isami and you are the same age. But you both use the elder sibiling honorific. Nee-chan. (Big sis) Nii-sama (Big brother)

Y/n: Nee-chan. Wake up it's time to get up.

Isami: It's too early. I don't wanna get up.

Y/n: Nee-chan it's 7:00. If we don't get their early you might not be able to spy on the girls.

Isami: True but I don't wanna move.

I smirked knowing what to say next to get her up.

Y/n: And maybe I'll take away your photo album that has pictures of naked in it.

Isami: What!? How'd you find that!?

Y/n: That's a thing?

I asked with a raised brow.

Isami blushed at her secret being found.

Isami: No it isn't. Well thanks to shock I'm up now. So how about we have some fun Nii-sama.

She suggested as i saw her placing her hands under her boobs and lifting them slightly.

I smiled and waved her over. I watched as she came close with a large smile on her face as I could see little hearts forming in her eyes. Those hearts disappeared as I jabbed her forehead with my index finger and middle finger causing her to back away.

Y/n: I'm sorry Nee-chan. Some other time maybe.

After I said that, I placed my hands in my pockets and walked down into the kitchen before she could complain. After half an hour of waiting, I watched as Nee-chan came walking down with the top few buttons of her shirt undone. I moved over to her did them up before placing a kiss on her forehead.

Y/n thoughts: I have a strange relationship with my sister. Oh well, I was never really normal to begin with.

I thought to myself as lightly grazed the ring on my left hand. Once we were all set. I grabbed her hand and we started our walk to school.

(At school) (Y/n P.O.V)

We arrived and as soon as we did, all the girls around started glaring at my sister. I get it considering she does peep on them all the time, but that's because she's a bit self conscious about her body. I tell her when she shows her body to me that while she only has C-cup breasts, I told her that I prefer her waist which lead down to her nice ass. (Looks in the info chapter)

She always smiles at kisses me on the cheek. When we are alone, we never act like brother and sister but instead we act like a couple. We don't care what others thinks, even our parents think we look adorable. Dad had told me that if I decide to pursue a relationship with her, then he would support me. Mainly for the fact that while I am his son, I'm not related by blood so he doesn't care. I think Nee-chan was listening in on our man to man talk as after that I would always find her in my bed naked.

Y/n thoughts: I'm sure if I gave her the chance, she would make sure that I never leave my bed until she's pregnant.

I thought as some of the girls waved to me. I waved back as I pulled out my coin and started flipping it. When I caught it though, I saw the one of the Kuoh academies great ladies was staring at me and my sister. I nodded to her and saw her have a small smile as she gave me a small wave before me and Isami went to our classroom.

Y/n: I wonder what Rias Gremory was doing staring at us?

I said under my breath.

(With Rias) (No one's P.O.V)

Rias: Akeno, who was that boy?

Akeno: Your asking this question. He's in our class Rias. Y/n L/n. Adopted brother of Isami Hyoudo, the perverted Queen as the school calls her, or our little empress as we call her. He always wears gloves on his hands but when he takes them off. We can see he has a ring on his left hand. From what I can tell, he does have some magic force within his body. Who knows maybe Isami-chan can get him to join us.

Rias: Y/n L/N.  I wonder what he can do.

(Timeskip. End of School.)

It was the end of the day and Y/n was leaning against the school entrance as he was flipping his coin while having his eyes closed. He opened his eyes as he caught the coin and looked at the side that was facing up. He saw the letter X facing towards him. Smiling at the coin, he remembered the girl who gave it to him. Looking up slightly he saw a girl in a different school uniform standing in front of him with a blush.

???: uhmm hi.

Y/n: Hey there.

???: Your Y/n aren't you.

Y/n: That's right. Now why are you here miss...

He trailed off as he saw her blush increase.

Yuuma: Yuuma Amano. And I'm here to ask you out on a date.

Y/n: Really? But we just met.

Yuuma: I know but I've heard stories about you. So I wanna see if they are true.

Y/n: Sure thing then.

Yuuma: Thank you Y/n!

She said before hugging him tightly.

Isami: Hey! Keep your hands of my Nii-sama!

I sighed as I saw Yuuma back way slightly. I turned to Isami

Y/n: Hello Nee-chan.

I said with a sigh as i grabbed Yuuma's hand.

Isami: Nii-sama why are you holding this girls hand?

Y/n: Right. Nee-chan, this is Yuuma Amano. A girl I'm going on a date with today.

Isami: What?! 

Yuuma: Nice to meet you Isami-san.

Isami: Listen here. While I will admit you are cute, when Nii-sama get's home, he better still be a virgin. Or else you will see a side i never show.

I sighed as i watched Yuuma come closer to me in fear before i tapped Isami's head with two fingers.

Y/n: Calm down Nee-chan. Nothing like that will happen I promise. Head home, I promise to make it up to you.

Isami: Fine. I'm having some friends over as well, so if you come home then you may meet them. 

Y/n: Ok then Nee-chan. I will see you when i get home then.

I said as I gave her a small peck on the forehead before I walked off with Yuuma as I felt Isami's stare on my back.

Yuuma: Your sister is a bit strange.

Y/n: I'd call her unique.

I said as Yuuma let out a small laugh before we went on our date.

(Date proceeds as it does in DXD just it's with you replacing Issei, and you brought her a ring instead of a scrunchie)

Yuuma and I were currently sitting on a bench in the park as the sun was setting. I looked and saw her resting her head on my shoulder as she looked at the ring that i brought her. I saw the happy look on her face until we heard laughter. Our heads snapped up as we saw a man wearing a fedora standing in front of us. I stood up and placed my arm in front of her protectively as the man stared at us. 

Y/n: Who are you? Why are you bothering us?

???: Have you had enough fun for today Raynare?

When he said that, I turned and saw Yuuma or the newly named Raynare looking at the ground.

Y/n: Do you know him?

Raynare: Yes. His name is Dohnaseek. A fallen Angel like myself.

I heard her say as two wings flared out of her back.

Y/n: Your like him?

I asked seeing her nod as tears were welling in her eyes.

Raynare: Yes. I'm sorry Y/n please forgive me I didn't mean to lie to you.

Dohnaseek: You were played kid. Now it is here that you will die by my hand.

I turned to see Raynare staring at the ground as tears leaked out of her eyes. I sighed as my ring glowed while shadows formed around me. The fallen backed away as it disappeared leaving me in black armour with blue cloth around certain parts. My left arm hung at my side as though I never had control of it. In the grasp of my right hand was a large greatsword. I was kneeling on the ground as I pushed myself up.

I stared at Dohnaseek as black smoke formed around us until it converged on me. I grunted as I felt my power grow until I let out a large roar. (The one he does when you start the fight)

The smoke disappeared as I rushed towards Dohnaseek the greatsword raised to run him through as black liquid was being trailed on the ground. Dohnaseek jumped away but didn't expect me to jump after him before slamming him down as the sword pierced his shoulder. Once we both hit the ground I pulled the sword out of his shoulder before impaling him in the gut and throughing away with enough force he broke 3 trees. I turned to Raynare as I placed the greatsword on my back as I walked over to her.

Y/n: Raynare.

I said calmly as my voice had two tones to it. (Look up Artorias cut dialouge to hear what he sounds like)

Raynare: I'm sorry.

Y/n: Don't worry, I knew that one day I would have to reveal that I was a sacred gear wielder. Come on I'll explain once we get to my place.

I said as my sacred gear faded away leaving me in my normal state as I moved my left arm getting feeling back in it. Grabbing her hand, I covered her mouth and nose as we were enveloped by the black smoke from earlier. (The whole abyss smoke thing that covers him)

(Hyoudo House. Y/n room)

We appeared back in my room as I removed my hand from her only source of breathing.

Y/n: Sorry about that. But If I use the Abyss to travel then those I travel with my get affected by the abyss.

Raynare: The Abyss?

Y/n: A dark place where I can wander every now and then. It's home to things that would scare anyone, but to me. It's a home away from home. My scared gear is called Abyss Walker. I gain that armour and blade and my abilities are raised.

Raynare: Interesting.

Y/n: Well it's kinda late. I'll go down and make some food for us. Just stay here.

I said as I walked out of my room after she sat down on my bed. I walked down to the living room to see a bunch of people sitting around the table. I noticed that all the people in there were popular at school. The school mascot Koneko Toujo. The school princess Kikiyo Yuto. And the two great ladies of Kuoh. Akeno Himejima and Rias Gremory. They all turned and their eyes hardened as I happened to notice that my sword didn't disappear and was still on my back.

In this situation I only had one thing to say.

Y/n: Son of a Taint.

(End)
So something I forgot to say your connection to the abyss allows you to have knowledge about devils and other supernatural beings. Not in the sense of history but only the ability to sense who are devils. That's why you didn't really care about how Raynare was a fallen Angel. And also for those who don’t know. This is what Artorias sword looks like.

You will become a devil in this story. But only after someone tries *Riser* says something about Isami. You become a devil to participate in the games to get some revenge, and I will have your Sacred Gears Balance Breaker all done by then as well. I just need to work on abilities and thats it. Also after seeing the Cut dialouge for Artorias I feel bad now. And actually thinking about Sif's Alternative cutscene I realised that Sif was trying to train me to make sure I don't end up like Artorias. From this Day on all RPG Characters will be named Artorias in the honor of this man.