I don't own Highschool DxD

Prologue

A seven years old boy walked around a park, his parents close behind him. The boy, named Hyoudou Issei, ran around chasing after a squirrel until he came across a little girl. She was a cute little girl with long straight black hair down to her hips. Her dark grey eyes looked dull and lifeless. She was dressed in a black lolita dress with a purple ribbon on her back. The most stunning thing about her was her ears, unlike normal ears her's had pointed tips like elves. He walked closer and tried to talk to her. ''U-uhm are you here by yourself?'' The girl remaind unmoving, looking at the pond. Issei got in front of her and tried it again.

''Hello, I'm talking to you. Are you here with your parents or with your friends?'' The girl looked him in the eyes before slowly opening her mouth.

''I, don't have parents... or friends.'' She answered in a monotonous voice, before turning her head away again.

''What...? That's terrible! Aren't you lonely?'' Issei asked, getting even closer.

''No, I was alone from the begining. I, don't know what loneliness is.''

''You were alone from the begining? That's just … Hey, why don't we become friends?'' The boy said smiling brightly.

''?'' The blackhead only tilted her head in confusion.

''Come, let's play.'' Issei took the hand of the girl and walked off with her. She looked at the boy, thinking he was a weird human. He was seven years old and had short brown hair. His eyes were a light brown with a gentle and innocent look in them.'This boy, is strange. I, feel something in him. Something, similar to me.'

''So what do you want to play …. Ah! I don't know your name.''

''I'm, Ophis'' The girl, now know as Ophis, answered short and still monotonous.

''Ophis-chan, huh? I'm Hyoudou Issei.'' All she did in return was giving a small nod. ''Let's play tag.'' The boy poked Ophis in the side and started to run.'' Come on, try to catch me!'' He shouted looking back only to see her nowhere.

*thud*

Issei landed on his butt, because he bumped into someone. ''O-ophis-chan?!'' He was surprised to see his new friend in front of him showing him a victory sign, although her expression didn't change. ''I, have caught you.''

''H-h-how did you -?! Awesome, can you show me how you did that?''Issei had sparkles in his eyes and grasped her hands.

''I, just walked.''

''That's soooo cool! Can you teach me to walk so fast?''

''I, don't mind.'' The couple of kids trained (only Issei) for a few hours. The parents of the boy came back to get their son. Since Issei found someone to play with, his parents decided to go to a nearby cafe. ''Issei, it's time to go home. You can come back tomorrow.'' The boy remembered something his friend told him and walked over to the girl. ''Ophis-chan, you said you were all alone, right?''

''Yes''

''Then how about you live with us?''

''…'' The girl didn't know how to answer. She never expected that there was a human who would want her to be around.

''You don't want to?'' The boy looked at her with puppy eyes. Ophis didn't understand emotions, but she didn't like seeing Issei like that. ''I, don't mind.'' Issei smiled and immediately took her hand, walking hand in hand to his parents. It took him 50 minutes to convince them to let Ophis stay with them, but they agreed anyway. ''Issei, dinner will be ready in half an hour. Tell Ophis-chan to take a bath before you.'' His mother told him this from the kitchen. ''Ophis-chan, Mom said you should take a bath first.'' Issei walked up to the girl, who sat on his bed in a seiza position.''...?'' All the girl did was tilting her head. ''What's wrong? Come I will show you where the bathroom is.'' The boy grabbed the girl by her arm and guided her through the house. ''So, here we are. Mom will bring you a towel later so you can go in.'' He turned around to leave, but was unable to move. He looked back to see the black haired girl holding his shirt with her left hand. ''Ophis-chan?'' Issei was worried about her odd behavior. ''Issei, what is a bath?''

''…''

''…''

The two of them stood there silently starring at each other.''E-eh? A bath is something you do to clean yourself.'' the girl looked at him and tilted her head. ''I, don't know how... can you teach me, Issei?'' The boy, with a bright red face, ran to his mother with Ophis close behind him. ''U-u-uhm Mom?'' The boy was embrassed and had a crimson red face.

''What's wrong Issei? I thought Ophis-chan was already in the bath?''

''A-ah, about that... O-ophis-chan said she doesn't know what to do...'' His face got even redder, if that was even possible, and his mother looked a little shocked and unsure what to do.''*sigh* I guess it can't be helped. Issei just go in with her, but don't make a mess in there.'' she turned around to give him a few towels and walked away to resume cooking. ''E-E-EHHHHH?!'' Issei shouted, quickly turning around to see his mother walking away.'M-mom is serious about that?!'

''Issei, will take a bath with me?'' Ophis asked him without changing her expression.

''T-there is no way that you would do something that embrassing, right?'' Issei asked her, getting a bad feeling.

''Embrassing? I, don't quiet understand. Let's take a bath, together.'' Ophis said dragging Issei with her. 'Why is she so strong?! She's dragging me behind her with a single hand!' Issei shouted in his mind, unable to break free. 30 minutes passed and Issei and Ophis came out of the bathroom, Ophis looked refreshed and even had a slight smile on her face, Issei on the other hand looked like he barely made it out alive. They both walked into the living room in pajamas, sitting down on a table. ''What's wrong Issei? You look awfully exhausted.'' His father asked him, fixing his glasses.

''It's nothing.'' The brown haired boy said, looking at his plate.

''I-is that so...'' Mr. Hyoudou sweatdropped at the half-hearted answer of his son. ''Ophis-chan, do you like it here with us?''

''Mhm.'' The girl nodded, while stuffing her face with food. The rest of the dinner was spent in silence, with Issei's parents smiling at the children, Issei slowly getting his energy back and Ophis eating enough for four people. The couple of children was now in Issei's room, Issei in his own bed and Ophis in a futon placed besides the bed. ''Let's play again tomorrow, Ophis-chan.'' The boy stared at the celling. ''Mhm.'' The girl nodded with a smile on her face, it was a shame that Issei couldn't see it.

(... Next day ...)

Issei woke up from the chirping of the birds, rolling to his left side. He hugged his dakimakura tightly and decided to sleep a bit longer... Wait, he didn't have a dakimakura. He opened his eyes to see Ophis in front of him, looking at him. Issei quickly jumped out of the bed, or at least tried it. The girl grabbed his wrist and once again pulled him in a tight embrace. ''I, like being like this.'' Ophis said it with her eyes closed, rubbing her cheek against Issei's hair.'Am I imagining things or is Ophis-chan getting more and more clingy? Well, it's a good thing if she's happy, but her expression is the same as ever.' Issei thought to himself and closed his eyes. Another 20 minutes passed with the two of them hugging each other. ''Issei, Ophis-chan breakfast is ready!'' Mrs. Hyoudou called the two children from below, slowly walking up the stairs. She opened the door and spotted the couple on the bed of her son. ''Oh my, looks like you two really like each other. To become this close to each other in only one day...'' She walked up to them and lightly shook Issei's shoulder. ''Wash your face and come down. You too, Ophis-chan.'' The mother left and made her way down. ''Let's go.'' Issei wanted to stand up, but was pulled down again by Ophis. ''O-ophis-chan, if we don't go up, we won't get anything to eat.'' The girl shot up after hearing the word 'eat' and run to the bathroom. ''Issei, we need to wash our faces.'' She took the doorknob in one hand and the hand of the boy in the other. 'Her eyes have sparkles in them! Just how much does she like food?!'

''Good morning Issei, Ophis-chan. Did you sleep well?'' Mr. Hyoudou asked the couple once they entered the living room.

''Yeah, I slept like a stone.'' The boy answered, but the black head tilted her head.'' I, don't need to sleep.'' All three Hyoudous looked shocked about the statement and the mother of the house crouched down to look the girl in the eyes.''That's bad. You should properly sleep.'' Mrs. Hyoudou tried to lecture her, but it didn't went well. ''I, don't need to rest.'' The woman was troubled about the stubbornness of Ophis, but didn't want to give up. ''No! You mustn't be awake all time! If you don't rest like a good girl... than you're not allowed to hug Issei in his sleep!'' The brown haired woman said this, resulting in a bright red face from her son, a frown from the blackhead and her husband raising his eyebrow. 'Should I ask about the last part? Well, I don't see any harm by her cuddling with Issei.' Ophis was deep in thoughts, thinking about the reason why she didn't like the idea of being banned from hugging him. ''That, would be a problem. I, shall sleep.''

''Good girl.'' Issei's mother patted the girl on the head. ''Now, let's eat.''

'' '' '' ''Itadakimasu!'' '' '' '' All of them began eating at the same time.

(...Park...)

''*pant* *pant* W-why are you looking like nothing happened, when we ran around for a hour straight, Ophis-chan?'' Issei asked her, trying to catch his breath. ''I, have infinite power. This, is nothing.'' The girl stated it like it was nothing. Issei wanted to retort, but someone interrupted him.

''And we would like to have this infinite power.'' A handsome man dressed in black armor with a cape walked up to them. He had long brown hair that goes to his hips with many bangs covering his right eye. ''Devil...'' Was the only word Ophis gave him as an answer. ''Yes, that's right. But I'm no ordinary Devil. I am the descendant of the great Maou Beelzebub, my name is Shalba Beelzebub.'' The man exclaimed it while spreading his arms to his sides. Issei walked in front of Ophis and shouted.''Who are you?! And what do you want from Ophis-chan?!'' Shalba looked down like he only now registered his existence. ''Don't talk to me you flithy human.'' Shalba waved his left hand and Issei's abdomen was pierced by a beam of light. The boy cought blood up and collapsed onto the ground. ''Issei!'' Ophis tried to run up to her friend, but was stopped by the devil who stepped in front of the boy. ''Now that the nuisance is out of the way, let's go.'' The man grabbed the wrist of the girl and a strange glowing circle appeared under them. ''Issei!'' The blackhead broke free and made her way to the boy. ''Issei!Issei!Issei!'' She shoke him, but the blood flowed out of the wound like a waterfall. ''How annoying, I guess I should just pulverize him.'' Ophis turned her head around and glared at him. The devil took a few steps back, even he wouldn't want to fight against someone like the Infinite Dragon God. ''O-ophis-chan, he is here for you … get away … from here...'' The boy had lifeless eyes and his body got colder by the second, but he still worried about the blackhead.

''Boy, why are you so worried about that thing?'' The man looked at the almost corpse of the boy.

''Did you just... called Ophis-chan... a thing?'' He had no energy, but managed to glare at Shalba.

''Of course, because that's what it is. The Ouroboros Dragon God, it's ageless and genderless, but if you look at it from another point of view, then it's nothing more than a giant mass of energy. So, how is it not a thing?'' Ophis got nervous, even gods feared her. So it wouldn't be strange for Issei to be afraid of her. But even she didn't expect that kind of response.

''I... don't understand... complicated stuff... But there are two things... I know. First, Ophis-chan... is Ophis-chan... no matter what... and...'' Issei's heart was beating faster and faster. 'How can my heart beat this fast, when I don't even have the strenge to breath properly? In a moment like this, it's the boy's job to protect the girl. Like the hero in Drag-so Ball.' His hand shone in a birght green light, and was covered in a red metal glove.

[BOOST!]

The glove shouted a command and Issei had the strength to stand again, though he was shaky on his legs. ''I was surprised for a moment, but it's just a [Twice Critical], how disappointing.'' Shalba kicked the boy into the hole in his stomach, which resulted in him crashing into a tree. ''Issei!'' The girl run up to her friend and tried to heal him. ''Just come with me already!'' Shalba grabbed Ophis by her collar. The hole in Issei's abdomen was still present, but only half the size as before.

''*pant* *pant* And the second is... that I can't let someone like you... take Ophis-chan with him!'' He shouted and charged at the devil.

[DRAGON BOOSTER!]

The glove shouted again, changing into a gauntlet that covers his whole left forearm. ''What!?'' Shalba was surprised and let go of the dragon god. ''It wasn't a [Twice Critical], but one of the 13 [Longinus]!'' Issei was now in front of him and struck him into the stomach. ''Hmph, don't think that this even tickled.'' He once again tried to kick him, but Issei managed to dodge.

[BOOST!]

''Even if you power up like this, someone like you will never stand a chance against me, a true Maou!'' The man was too distracted by Issei so he didn't notice the ball of pitch black energy coming his way. ''Argh!'' His arm was engulfed by the energy and disappeared. ''I, shall erase you.'' Even Issei was scared of Ophis, with the cold stare she gave the devil. ''Kuh, It can't be helped. I will retreat for now.'' A magic circle appeared beneath him and he disappeared a second before another ball could hit him. The Ouroboros Dragon made her way to the boy, put her hands over the wound and started healing him. ''Ophis-chan, you're incredible. To beat him so easily.'' Issei made a weak smile and put his hand, still in the gauntlet on her head. He started to pat her until he was finaly completely healed.

[RESET!]

A new sound came from his left arm and he lost all strength, collapsing into Ophis arms, she lifted him up and walked away, carrying him like a princess.

(...At home...)

The two children were sitting on Issei's bed. The boy rested his head on the lap of the girl, getting patted. ''Ophis-chan, do you mind explaining about what happened there?'' Issei asked her with closed eyes. ''He, was a devil. You may know them from the bible. And the thing on your arm is a Sacred Gear, a power given to humans by heaven.'' She explained it short and without details, but Issei understood it, more or less. ''He said something about a Longi-whatever.''

''[Longinus], a Sacred Gear that can kill gods and Maous.''

''A-and I have something that great?'' The brownhead looked at the gauntlet with wide eyes.

''Mhm, [Boosted Gear], It's a Sacred Gear that has a Dragon sealed within.''

''A-a Dragon?!'' Issei had sparkels in his eyes. ''Wait, didn't that Shalba called you a dragon, too?''

''That's right, Ooroboros Dragon, that's me. One of the two strongest existence.'' She once again showed him the victory sign, at which Issei made a wry smile and scratched his cheek. ''And the dragon in you is the Welsh Dragon, Ddraig. He is one of the two heavenly dragons.''

''So, Ophis-chan, you said you were one of the two strongest. Then can you please train me?'' The girl was unsure what to do. It's not like she ever trained someone, so she doesn't know what to do. ''I, can't train you,'' Issei looked dejected after hearing that.''but I can bring you to people that can.''

''R-really?!'' He shot up from her lap and hugged her after she nodded. ''Thanks, Ophis-chan.''

''It's ok. Now, let's sleep. You, need to rest. Training will start tomorrow, maybe.''

''Ok, good night.'' He closed his eyes and snuggled into the bed, again being the dakimakura of the dragon god. 'Wait, did she say maybe?'

(...Next day...)

Issei woke up early this day, but the most surprising thing was that he had enough strength to free himself from Ophis death grip. He finished his breakfast fast and took the portion of the girl into his room. He needed to go up and down five times. ''Ophis-chan, please wake up. Your food will get cold.'' She was almost like Snow White, for someone who doesn't need sleep, but instead of waking up by a kiss, she jumped up from the smell of food and grabbed the first plate. ''S-so, you said you would introduce me to someone who would train me. Is that someone also a dragon?'' The dragon answered, still stuffing food in her mouth. ''No, you will train with gods, and devils.'' Issei flinched at the mention of devils, but Ophis patted his head. ''They won't harm you, I promise. I, shall protect you.'' The boy blushed at the rare smile from her and mumbled. ''T-thank you.''

(...Takamagahara...)

A tall, black haired woman sat on a veranda drinking tea. ''*sigh* It's pretty lonely here, when nobody visits me.'' The woman was dressed in a white and red kimono, with a golden obi. She had a silver tiara on her head with a deep blue emerald in it. She was the head goddess of the Shinto religion, Amaterasu, but because of that nobody dared to approach her. It got even worse when she once shote herself in, which resulted in the sun hiding itself. The goddess sighed once again, before dropping her tea. 'What is this pressure?!' The woman had problems to breath and saw a girl a few feet from her. 'Who is that? I can't see her clearly.' From behind the girl walked a boy up to her and helped her to sit right again. ''Onee-chan, are you okay? Does it hurt anywhere?'' The boy asked her in a worried tone, looking at her with sad eyes. 'Who is this boy? Why is he unaffected by this enormous power?' The girl walked up to the woman and the pressure vanished at once. ''Shinto sun...''

''W-who are you?'' Amaterasu asked trying to catch her breath.

''Ophis...'' The Ouroboros Dragon once again had her habbit to avoid speaking too much.

''T-the O-ouroboros D-d-dragon?! Why are you here?!'' Amaterasu tried to back away, taking Issei with her subconsciously. ''First,...'' Ophis said it pointing at the breasts of the Shinto god. '' don't suffocate Issei.'' Said goddess looked down to see her pressing the head of the boy into her chest. ''A-ah, s-sorry.'' She let go of Issei, who had a bright red face. ''How innocent... cute...'' Ophis eyebrow twitched in annoyance. ''Second, I want you to train him.'' The goddess turned her head from Ophis to the boy and concentrated. 'Now that I look more clearly, his body is not purely human, but why? If he had a Sacred Gear it would explain his soul, but not his body...' She once again faced the dragon god. ''Who is this boy?'' Amaterasu asked her patting the head of the boy. ''Sekiryuutei...'' The goddess gasped at it and Issei tilted his head. ''Onee-chan, what's wrong?'' Issei gripped the sleeve of the kimono and looked at her with puppy eyes. 'So cute...' Amaterasu blushed slightly and pulled him into a hug. ''Don't worry, Ouroboros. I will take good care of him.'' Ophis pulled Issei out of her bear hug and hugged him herself. ''Good, I shall bring him to you, another day.'' The Shinto sun pouted at the possessiveness of the dragon, but let it go, she was still afraid of her strength. ''Bye-bye, onee-chan.'' Issei waved at her with a smile. ''Bye-bye.'' She happily waved back. Issei would later regret calling one of the Shinto trinity 'Onee-chan'.

(...Underworld...)

Another black haired woman sat in her room watching a Mahou-Shoujo anime. She is dressed in magical girl's clothing in pink and black, with a magic wand in her hand and a hat on top of her head. Her twin tails swayed up and down, because of her being so excited. ''Leviathan...'' A monotonous voice called out to her, startling the woman. ''Woah, where did you come from?!'' The girl tilted her head. ''Takamagahara...''

''No, that's not what I meant... Wait, Takamagahara?!''

''I have a, favor to ask of you...'' Ophis ignored what the woman said and resumed. ''Please, help training, Issei.'' She said and put the boy in front of her. ''Woaahh, a Mahou-Shoujo...'' Issei said in awe, resulting in sparkles in Serafall's eyes. ''That's right! I, Serafall Leviathan, am the Mahou-Shoujo of the underworld, Miracle Levia-tan!'' Levia-tan(?), stuck her tongue out and winked at him. ''So, about my favor...'' The dragon didn't like the fact that she was ignored. ''Ah, sorry sorry. You want me to train this boy? Why?'' Ophis looked down to Issei and pulled him a bit closer. ''Beelzebub, could come... for revenge.''

''Akuja-chan?'' Serafall was surprised to hear the title of her friend, but the girl shook her head.

''No, not him.''

''What do you-'' The devil took a moment before she realized what she meant. ''Ok, I will help, but I can only do basic training and teach him ice magic.''

''That's, good enough.''

''Everything is okay then.'' Serafall once again winked at Issei. ''Can I, leave Issei in your care, for a while?'' Ophis asked the Maou. ''I don't mind, but what are you going to do?''

''I, will ask a few greek gods for help.''

''Aaahhh, I understand. They can be... really annoying.'' The devil made a wry laugh and took out a DVD. ''Issei-kun, was it? Let's watch this together until she get's back.'' It was a DVD from the anime 'Magical Girl Milky Spiral Seven'. Issei nodded, waving at the dragon. ''Bye-bye, Ophis-chan.'' The girl gave him a small smile. ''Mhm, I will be back right away, Issei.'' The girl vanished in a cloud of black energy. ''Wait, Ophis?! Like the Ouroboros Dragon God?!'' Issei was startled by the sudden outburst. ''Y-yeah, that's what she said.'' Serafall shuddered by the thought of enraging her. 'I need to be careful around her. Oh Issei-kun has sparkles in his eyes. How cute... Is this maybe a chance for me to make him a Mahou-Shoujo fan?! I will have a friend with the same hobby!' She got pumped up and walked behind Issei, lifting him up and putting him down on her lap again. ''Leviathan-san?'' The boy was puzzled about the action. ''Don't worry, it's more comfortable this way, right?'' She said resting her chin on his head. ''And just call me Sera or Levia-tan.'' Issei was unsure about calling an adult 'tan', but let it go. ''Then, Sera-san.'' Sera pouted like a small child. ''Drop the honorifics~'' They watched animes for three hours straight before Ophis came and took Issei back home.