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Sirzech sighs walking in his office, the red head takes a seat on his chair and release another tired sigh after dealing with all the recent event with taking Kokabiel to the Grigori to be punish for his crime by trying to start another great war. After dealing with that he ordered devils to repair the Kuoh Academy back to its normal state then call the church about the crime that Valper committed. "Sirzech-Chan!" A loud voice booms outside the door making Sirzech eyebrow twitches 'Why now of all time'.

The door slams open with a pink blur dash toward Sirzech desk showing a smiling Serafall "I heard Nawin-kun is here so I came rushing" She giggles "I'm sorry Serafall, but Nawin-kun is currently not feeling well so please come back later" Sirzech reply tiredly not feeling like talking "Oh no if he's sick then I should help him!" "NO!" Sirzech slam his hand on the desk creaking it slightly while startling the pink Satan.

Sirzech shake his head getting his emotion in check "Serafall please come back later if you want to see Nawin-kun okay" he said looking at his childhood friend seriously. Serafall sighs and nod "Okay, I hope you know what you're doing Sirzech" She said in an unusual serious tone catching the red head off-guard a bit.

Serafall walk out and shuts the door leaving Sirzech alone again. Suddenly Grayfia teleport in and turns to see her husband tired state "Sirzech shouldn't you be resting? you've been working a lot lately" the red head shakes his head rubbing his eyes "I'm not done yet… Nawin-kun how is he?" he asks turning to her.

Grayfia sigh "He's still unconscious, but Sirzech what concerns me is the mark on his neck" the red haired turn serious "That mark hold very dangerous and dark magic in them, I can sense it when I examined his neck" Grayfia said.

"I know the purple aura that swirled around him when he battled Kokabiel it's sinister and uncontrollable while making his power skyrocketed to another level" Sirzech stands up and walk to the window that over looked the whole city.

"His power at that time was easily at High-Ultimate class… Grayfia let's go to him, I need to do something, before this power will completely consume him"

Nawin's Room

When coming back from Kuoh Academy Sirzech placed Nawin in a safe room which is filled of barrier so no one can come in or out without he's permission. Sirzech and Grayfia arrive at the room to see Nawin lying down on a bed sleeping soundly.

Sirzech walk to the black haired and stop beside the bed "Grayfia I need you to hold him down" the silver haired look at her husband confuse "Sirzech what are you planning?" The red head turns he's attention to the mark "I'm going to seal the mark, restricting its power, but it won't stop it completely though it's better than nothing" Sirzech place his right hand on top of the mark.

"But Sirzech isn't it dangerous you could accidently release its power again" Grayfia state "I know but I borrowed some of sealing books from Akuja don't worry I know what I'm doing, but if he does wakes up and lose control then we'll be prepare".

Grayfia holds onto Nawin hands pinning it to the side, Sirzech eye flash red while his hand glows blue. The Makasha eyes suddenly snap opens and began struggling, screaming in pain. Grayfia freezes his feets while keeping a firm hold on his arms.

"Ahhhhhhhhhhhhhh" it hurts Sirzech to hear the black haired pain scream, but he has to continues for the Makasha sake "Seal Suppression!" Sirzech yell causing his hand glows brighter. When the light died down Sirzech remove his hand and look at Nawin's neck to see the mark now have another outline that looks similar to the power of destruction form that goes around the mark. 'It's probably look like that because I used my power to suppress the mark' the Satan state mentally.

Sirzech turns to Nawin to find the black haired pass out probably from the pain "Did it work?" Grayfia ask letting go of the Makasha hands and shatters the ice on his feet. "Yeah I can feel the mark is more stable now, for now we can just hope he will regain consciousness soon" Sirzech reply.

"You do know that will only stop it temporarily right" A voice state making the two turn to see Azazel leaning against the wall looking at the black haired, Grayfia body stiffen while Sirzech look at the man who looks to be in he's twenties with an average build, black hair with golden bangs and black goatee, purple eye.

"Why are you here Azazel?" Sirzech look at the leader of the Grigori "Is it a problem for me to check on my student" the black haired reply shocking Grayfia while Sirzech sighs. "No it's not but shouldn't you be dealing with Kokabiel?".

Azazel stop beside the Makasha, Grayfia was about to freeze the fallen angel, but Sirzech raise his hand up stopping her "I already dealt with that… he's dead" Azazel reply kneeling to his knees and examines the mark. "Do you know what it is?" The red haired ask.

"….No I have next to no clue what it is, but I know it's corrupting Nawin's mind, I saw the battle with Kokabiel and that's not like him. Nawin may show no mercy to anyone who hurt his friends and love ones, but he does have limits to hurting them, this mark has something to do with it, the way he gruesomely dealt with Kokabiel" Azazel state standing back up.

"Can you explain that purple aura swirling around him?" Sirzech look at the fallen angel "I don't really know that much, when I train the boy his aura is either black or white" Azazel reply "White?" Sirzech ask confuse never seeing the black haired used it.

"Sorry it's not my place to say, Nawin will have to tell you that… I have to leave now, but before that… do me a favor Sirzech look after the boy" Before Sirzech could say anything Azazel disperse in black feathers making him sigh.

"Sirzech I didn't know Azazel trained Nawin-sama?" Grayfia turn to her husband "I just recently learn about it myself, when I took Kokabiel to the Grigori, Azazel rushed toward me asking me if Nawin-kun is alright causing me to ask him on how he know about Nawin and he told me everything" Sirzech explain walking next to the black haired "When Nawin left Rias and her peerage before they started their one week training, Azazel was the one who'd been training Nawin in secret, I don't know how they've met, but that's all I know" He said making the silver haired nod.

"So that's why he was able to defeat Riser so easily and how he became so strong in such a short amount of time" Grayfia concludes putting the pieces together, "Yeah anyway after clearing that" Sirzech stretch his arm and yawns "I could use some sleep" Grayfia smile slightly at her husband childishness.

Time Skip

It's been a week now and Nawin still hasn't regain consciousness yet causing everyone to starts getting worry. The occult club member comes and visits him every day though Akeno practically stayed by the black haired side all the time and refusing to leave.

"N-nawin-kun please get up, I need you please" Akeno begs laying her head on the black haired chest as tears fall from her eyes, "You promise you will always be with me, get up, get up!" she cries while inside it's killing her to see the black haired like this.

Sirzech who stood outside the room hearing the raven haired cries 'If this continues… there a good chance that he will die' he mutters before hearing a couple of footsteps coming toward his direction making him turn to see his sister with her peerage.

"Onii-sama" Rias greet her brother, Sirzech could see black rings under her eyes indicating she hasn't been sleeping well. The group heard Akeno cries making all of them flinch "It's probably not the best time to go in just yet" Sirzech state making the group nod.

Akeno look at the bracelet that the black haired gave her 'Akeno if you ever need me just put your power into it and I will appear right next to you' Nawin's word ring through her mind. Akeno start adding her magic into it causing the black diamond to flash red "Get up, get up, GET UUUPP!" She yells.

Suddenly a hand caresses her cheek causing the raven haired eyes to snap open and turn to see a familiar brown eyes staring at her with love and happiness "You know… it's not nice to be loud when someone is asleep" Akeno jump into Nawin's arm hugging him closely while letting tears of happiness fall.

Nawin smile hugging his girlfriend back before pulling her away to give a kiss which she returns it instantly "I'm glad you're okay Akeno" he whisper "I should be saying that" she reply making the black haired chuckle. Nawin kiss her forehead "I love you" Akeno smile "I love you too".

"Teme" Issei dash toward the room smiling happily with the other member following behind him "Hey guys" Nawin smile seeing all his friends are okay. "Onii-chan" Asia cries slamming into her brother chest and hug him tightly, Nawin smile petting his sister blonde lock "Nice to see you again Asia" he whispers hugging her back.

Koneko come and hugs his arm surprising the others slightly while Nawin chuckle petting the white haired hair making her purr slightly "I'm glad you gotten better Nawin-kun" Yuuto smile at his friend "Yeah, how long was I out by the way?" the Makasha ask.

"One week" Rias reply shocking the black haired "That long huh" Sirzech walk in making Nawin turn to him "Everyone I want you to leave the room, me and Nawin need to talk" he said in a serious tone leaving no room for argument.

Everyone leaves the room though Akeno stayed, but Nawin give her hand a firm squeeze then smiles "Don't worry it'll just be a minute" she nods and walks out of the room closing the door. "How you feeling?" Sirzech takes a chair and seat at the side of the bed.

"I feel fine, hungry as hell though" Nawin said rubbing his stomach making Sirzech chuckle a bit before turning serious again "Nawin do you remember the battle" the black haired turn serious "Yes, I remember what I did, I don't really know how to explain it to you Sirzech, but this power" Nawin touch the mark "It's full of sinister and hatred, it makes me feel invincible and seeing my friend gotten hurt I guess it powers the mark more making me lose control of it" he explains.

"Where did you get it, because it wasn't there when I saved you from the pureblood vampire" Nawin eyes flashes red thinking of the white haired vampire before calming down "… I don't know who gave it to me, but all I know it's from a little girl almost loli like, when you left she appears and bite my neck after that I passed out" Nawin reply making Sirzech nods.

"Why does the mark feel different now?" The Makasha question "I placed a restriction seal on it in case you lose control again…. Nawin I'm ordering you to never use its power again" Sirzech said in complete seriousness making Nawin clench his fist "But, what if this power can help me protect my friends" he reply.

"That power is corrupting your mind tell me what happen if one day that power hurt the people you want to protect" Sirzech said shocking the black haired "You already have a power inside you that hasn't been awaken yet, so I will tell you again don't use the mark understand" Sirzech said softly making Nawin nods.

"Okay, I won't use its power" the Satan smile and pets the black haired "Good I'm glad that my Otouto is feeling better" Sirzech grin "Why do you call me that?" Nawin ask the red head a little annoyed, "Well Rias consider you a little brother so that also makes you my little brother Otouto" Sirzech ruffles the Makasha hair causing him to sighs 'Now I see where Rias got this from'

Time Skip

A couple of days has past and Nawin is now fully recovered and got all his energy back. The others told Nawin what happened for the last past week though what surprised him the most is that Issei told him about Lucy defeating Freeze with ease and help them with Kokabiel.

After going back home meeting his mom who hugs him then bonk him in the head saying that he need to get her permission first before staying over in your friend's house for a week, Nawin knew this was probably Lucy and Asia doing, so he said sorry and it won't happen again.

Present

Nawin is currently walking toward Akeno house wearing a long black jacket that he keeps unzipped, black glove on his left hand that reach up to his elbow, black long pants and silver shirt underneath his jacket with black boots that has red soles.

Of course the way the black haired dress always gets weird stare from the people, but the Makasha was used to it. As Nawin reached Akeno house he sees that it wasn't what he'd call a comfortable home 'She live in a place like this?' he questions looking at the old house that looks a little like a haunted house.

Nawin walk in front and knock the door, it took a few second for the door to open showing Akeno dressed in her Kuoh Academy clothes. "Good morning Nawin-kun" She smile then looks at his attire "You look nice and handsome" She giggles making the black haired chuckle. "Well then are you ready to go?" Nawin hold out his hand, Akeno smile and takes it before tthe two walk to the school holding each other hands.

"Akeno I was wondering if you want to live with me" Nawin bring out suddenly making the raven haired look at him shock "I saw your house and it looks kind of lonely and unhealthy for you to live in, so how about it" The Makasha turns to his girlfriend. Akeno smile "I would love to Nawin-kun" She give him a kiss on the cheek "How would I ever repay you for all the things you've done for me" she asks wiping a couple of tears away while the black haired chuckle "Seeing you being happy is all I need Akeno" he said making her blush.

Time Skip

After a couple of minute of walk Nawin and Akeno reached the Occult building, when the two enter "SURPRISE!" Everyone yells, Nawin look around to see the room is decorated with plastic, bats, cats, and candy 'Must be Koneko' he looks ahead to see dozens of different food and candies spread around the tables.

"What is all of this" Nawin said suddenly Issei appears next to him and spray string all over the black haired "It's a party for you getting better teme and for our new member" Nawin looks at Issei stoically as dozens of string covers his body. Xenovia walks in front of the black haired and bow "It's nice to see you up again Nawin-kun" She said.

Nawin grab all the string and throw it on Issei face "Ahhh my face!" before giving Xenovia a welcoming smile "It's good to have you here Xenovia" The blue haired nods smiling back. Rias walk and envelope the black haired with a hug "I'm glad you're feeling better Otouto" Rias said. Nawin hugs her back and sigh hearing her calling him Otouto, but still he couldn't help but smile "Thanks Rias".

Rias pull out "You should be careful" she warns confusing the black haired "OTOUTO!" Suddenly a voice boom behind Rias making Nawin turn to see Sirzech running toward him with open arms "Come give your Ani a big hug, we haven't seen each other for so long".

As Sirzech was in front of the black haired Nawin Sparta kick him in the face sending the red haired crashing into a book shelf causing all the books to fall down burying him in it "It's only been 3 days idiot".

Koneko, Asia, and Xenovia bring up aboards scoring all 10's making Nawin fist pump. "It's nice to see you on your feet again Nawin-sama" Grayfia says making the black haired turn to her "Oh, I forgot to thank you grandma for taking care of me when I was out" he said in gratitude causing Grayfia to smile a bit "It's no problem after all your part of the family".

"Yeah we are all one big happy family" Issei yells making the others chuckle "Oh Nawin-kun I actually got good news for you" Sirzech said appearing next to Grayfia "What would that be?" "Since you've become powerful over the past month, I decided to put up a match to see if you're ready to become a high class devil" he announce surprising the others "Same goes for you Issei" Sirzech turn to the brown haired.

"Hell yeah I'm going to do it, I need to become stronger" Issei said "I'm surprise… I thought you are going to say yes I can finally become the Harem King" Nawin points out making the other look at Issei. "Yes… But now I need to get stronger so I can protect you guys and the people I care for" Issei reply with determination in his eyes.

Everyone is shock hearing that while Nawin smile and walk toward the brown haired bringing his fist up "Fine then Pervert let's see if we both can become a high class devil" Issei smile and bumps the black haired fist.

Sirzech smile seeing the friendship between the two "Now then you two will be facing your opponents tomorrow and remember everyone in the underworld is going to watch after all you two are members of the Gremory" Sirzech state making the two nod.

"Onii-sama doesn't Nawin and Issei have to reach Middle-class first to get to High-Class?" Rias ask "True, but I know Nawin and Issei powers are past Middle-class and the opponent they'll be up against will determine if they can get to High-class Devil" Sirzech explain.

"Who will our opponents be?" Nawin ask making the Satan grin "Sorry, but you'll have to wait until tomorrow to find out anyway for now let's not go into detail and enjoy the party!" "Onii-Sama their not fighting anyone too dangerous right?" Rias ask a little worry knowing her brother can go overboard sometimes. "Don't worry Rias I have full confidant that Nawin-kun and Issei-san will be able to handle them" the Lucifer reassure his sister.

"Now then enough of that let's start eating!" Sirzech announce making the other nod.

Mini Timeskip

"Teme there is something I always wanted to test!" Issei said drinking a can of coke "What would that be?" Nawin turns his attention to the brown haired.

"Who's girlfriend has the biggest breast!" Issei announce making Nawin face palm, "We will test this out t-today!" he said sounding a bit drunk. Issei call Rias and Akeno who's trying out the dozen of desert. The two girl walk to them "Why did you call us Issei-kun?" Rias ask, suddenly Issei grope her breast making the crimson haired blush and moan a little "Issei s-stop thi-is not in public" she stutters.

"Onii-chan you have to try this chocolate mousse it's delicious" Asia walk toward the black haired, but stop when hearing a weird sound. The blonde was about to turn, but Nawin cover hers eyes with his hand "Asia don't look it's something you're not ready for yet" he states then turns to the white haired "Koneko-chan can you take Asia away from here please" she nods grabbing her blond friend hand and drag her away.

Issei let go of Rias breast then move to Akeno, when he was an inch away, blue fire appear on his crutch, Isse causing him to scream "Crutch on fire" Nawin looking at his friend running around the room. Rias appears in front of Issei and throw a glass of water down his trouser making him sigh in relief. "That's for being a pervert" Nawin turn to see Lucy standing next to the door with Sona.

"Good to know you can relax once in a while Sona" Nawin comment making the Sitri sighs "Lucy won't stop pestering me about coming here same goes with Rias" she mutters "Don't be a stick in a mud and enjoy the party" Rias smile at theSitri.

"NAWINNN-KUN" A voice boom across the room causing the Makasha to pale and sees Sirzech smirks sitting next to Grayfia who smile slightly in amusement "I hope you enjoy another surprise from me Nawin-kun" he said, suddenly a pink blur slam into the black haired chest sending him to the wall.

Nawin groan feeling lucky that he was a devil or he would have broken his back 'Hey is you're time to bang her' Tairex said suddenly 'Tairex what the hell happen to you lately' Nawin ask haven't heard from the black dragon for a while 'Oh you know sleeping' he reply making the black haired sweat drop.

"Nawin-kun it's nice to see you again" Serafall give the black haired a bone crushing hug snapping Nawin out of his thought. "It's nice to see you too Serafall now please let me go" he mutters.

The pink Satan let the black haired go then was about to grab his arm when Akeno takes it first "Sorry but I think it's time for me to have fun with my boyfriend" she states in a dark tone causing Serafall glare at her then take a hold of Nawin other hand "Nawin-kun promise me a dance so I will be taking him now!".

Sona sighs at her childish sister while taking a bite of a cake "I find hard to believe that Serafall-sama is your sister Keichou" Lucy admit eating the chocolate mousse "I know sometimes it feel like I'm the big sister" Sona mutters.

"Yeah I wonder how you deal with it" Nawin appears beside the two making them jumps in shock "Onii-san how, when, where?" Lucy turn to see Issei now is the one being pulled "It's call substitution, It's a useful spell if you know when to use it" he explains.

"Oh and Lucy I almost forgot to tell you something" The blond turn to her brother to feel him petting her blond lock "I'm proud of you, when I heard you defeated Freed and stop Kokabiel from getting a hold of the true Excalibur, I couldn't help but be proud you've finally getting stronger" Nawin smile.

Lucy sniffles before hugging her brother "T-thank you Onii-san you have no idea how much it means for you to say t-that" she said wiping away her tears."Okay now then why don't we take a group photo to remember this special moment" Sirzech announce.

Everyone got in to group "I don't like being in photos" Nawin mutters making Issei and Yuuto drag him to the group, Issei puts his arm around the black haired shoulder while Yuuto did the same the other side, Akeno, Rias, Xenovia, Koneko, Asia, Lucy, and Sona sat in rows, in front of the group Sirzech set the time and appears beside Grayfia, Serafall floats behind Nawin and hug him from behind, the group smile as the camera flash taking a photo of this special day.

As the party continues there is a white cat standing on a tree outside of the Occult building looking at group with its gold slit eyes before it dashes away.

Next Chapter: Battle To High-Class Devil