Don't expect canon.
I own nothing.
In a hotel room, a man was in front of the mirror trying to arrange himself in a tuxedo while he was having a hard time trying to fix the bow tie on his neck. The man appeared to be in his mid-twenties or thirties, having a black hair with golden bangs and a black goatee. He tried once more but, again, it didn't come out as it was featuring on the video playing on his smartphone. He sighed and snapped his fingers, making a small circle, with different patterns on its insides, appears on his front. Now, the two points of the tie started moving alone and organizing themselves, and in a couple of seconds, there was a perfect bow tie featuring under his chin.
Feeling victorious and proud, he opened the door of the bathroom and there were two teenagers waiting; one of them was a boy wearing a black suit, but the black coat was hanging on a chair close to him, and the tie and the sleeves were very loose, but the spiky brown-haired boy wasn't minding it very much, as his attention was on a book spotted on his left hand, while the other was resting on his chest. The other one was a girl who featured a long silver hair and blue-sapphire eyes,she was wearing a blue dress and stood against the wall with a very annoyed look on her face, the men on the room couldn't see but she was holding her teeth against each other with an incredible strength.
"Now, now, it's already time to go and look at you." The man said, slightly annoyed.
"I'm ready for quite long time, you know..." The girl said."The useless idiot over there that didn't made a move as he just reads that damn book."
The boy looked at the man and the girl on the room, and sighed. He stood up and put the coat and, on a similar way that the man did, he pressed his palms together, like a pray, and the clothes started arranging themselves, and then, he was ready.
"You can't use magic for every-".
"It seems that I'm the only person that don't make magic for everything in this room." The girl cut her master's words, making him look at her in a little bit of surprise and annoyance.
"Right… So, let's go with this." He said as the two teenagers stood at his sides and a large circle with geometrical patterns on its insides, similar to the bathroom one, appeared on their feet, and while they blinked their eyes, they appeared on a large hall. The place was giant, in height measurements, and it was adorned with golden columns that took equal space of distance of each other. The windows featured red curtains with various draws among its fabric. In the end of the hall, there was a large door leading to a giant room with an enormous quantity of people, an instrumental song could be heard from it, among the laughs and the voices of conversations. The man put his hands on the teens' shoulders.
"Now, listen. I already told you the political reason for this meeting and why we are attending it, so just cut the nonsense and have fun. Now, Vali, introduce yourself as Valerie but keep your last name as a secret and, please, don't fight with anyone." He said to the girl, who just nodded."Issei, try to have some fun that doesn't include mind tricks, and just don't sit on a corner ignoring the party." The boy whispered something agreeing."This party is made for young devils know each other well and get together, so, let's have fun. Oh, and for everybody's sake, don't fight each other." They entered the hall, and soon, they were greeted by a tall man with red hair and a very fancy suit.
"Ah, Sirzechs-sama. It's very nice to meet you in such enjoyable place."
"There is no need for such formality, Azazel, I'm very happy that you and your students could attend tonight. This is my wife, Grayfia, and my sister, Ria-tan."
"Onii-sama!" A red-haired girl complained, embarrassed.
"It's a huge pleasure meeting the Lucifer's family, I'm Azazel."
"The head of the Grimori. I must say that your reputation suits you very well, Azazel-dono."Grayfia complimented the man.
"Well, I hope that I don't have an appearance of a mad scientist at this moment." He said, making the couple laugh a bit. "Oh, where are my manners?! The young couple here with me are Valerie and Issei, I'm holding the post as their teacher and guardian." He said as they politely greeted the Maou and his family.
"Ria-tan, why don't you introduce Azazel's apprentices to the others, this is their first time with other devils." Sizerchs suggested to his sister that blushed because of the nickname, again.
The teenagers looked at each other and nodded with the head, and started following the crimson-haired lady along the place. She was a fantastically attractive young lady, with an envious body that was covered in a violet dress. While they followed her, Vali started walking with heavier steps and crossed her arms, and Issei was just with a distant look on his face, making him collide with people that crossed way with him, for Vali's annoyance and shame.
They accompanied the redhead to a distant table where a girl with long dark hair tied in a ponytail was sitting alone. Each one took a seat as Issei was in front of Vali and on the side of the Maou's sister. Vali felt weird and really angry but she didn't liked how the girl sometimes looked at Issei and her face became slightly pink.
"My name is Rias Gremory and this is the queen of my peerage, Akeno Himejima." She said, while the other girl had a polite smile on her face.
"Just Vali is okay."
"The name is Hyoudou Issei, but just Issei is okay for me, I guess."
"Ara Ara, It's nice to meet a lovely couple of fallen angels." Akeno said, but her voice almost died on the last words and both of the youngster noticed the raise on Rias' eyebrows and the quick look she gave to her Queen.
"Actually, I'm a Devil." Vali said.
"Human."
The Gremory girls gasped as his words and looked to him with shocked yet interested looks on their faces. A human among the devils.
"Ufufufufu, don't you think it's scary for a human to be alone among so many devilish monsters?" Akeno teased, winking at him.
"If monsters look as good as you, so there is no reason to be scared." The answer made her cheeks blush as she got caught by surprise while Vali mouthed some f-word to him." And I learned one trick or two that made my stay here pos-"
"He is a mage. Azazel took care of him because of his fancy Houdini nonsense." Vali cut him.
"Spoil sport..." Issei said as he rest his chin on his hand whose elbow rested on the table, despite the etiquette required in the situation.
"Well, yet is intriguing that a magic enthusiast called the attention of someone in the position of Azazel-sama, may I ask you to elaborate?" Rias asked him.
Issei looked at Vali who mouthed 'no'to him, which made Akeno go all 'ufufufu' again. Issei took a deep sigh and looked at Rias' blue/green eyes, which make him a little uneasy considering the gorgeousness of the lady in front of him.
"Well, I had no home so I was wandering on a town one day and found an old diary and it contained some weird writings, after some time, I could cast a lemurian spell that was considered to be lost."
Before he could keep his story, a duo approached the table where they were sit, and Rias stood and hugged the people.
"Please, I would like you to meet the rest of my peerage. This is my knight, Kiba Yuuto." A blond young man with blue eyes and a blue suit as well made a respectful bow to them and kissed Vali's hand, which increased the annoyance on her face and she looked at Issei, who just nodded to her as response. "And she is Koneko Toujou, my rook." She pointed to the white-haired small lady close to Kiba, she wore a black dress that wasn't so fancy and she kept a stoic expression on her face.
"Please, meet Azazel-sama's students, Vali, and… Issei?"
Issei was looking at Koneko in a way much more closer than what is socially accept. He kept this investigative glare on his face while he looked at her at different angles."Pervert." She called him, but yet, he still was staring at her. He took the distance back but still, he was rather intrigued by her existence. Not satisfied, he hold his left wrist with his right hand and a small flame appeared floating above the palm of his hand, and as if some air stream met the flame, the dancing blaze started pointing to the rook, he made semicircular moves around her and the fire kept pointing at her. Issei let his wrist loose and focus a little bit more on the blaze and it started moving, and in a weird way, dancing. Koneko and the rest of the group stood hypnotized by the weird ignited point that was slowly jumping in the air and making cycling movements that could be compared to a waltz. After a few seconds, it took the form of a cat that kept walking and jumping in patterns until it faded away.
"How curious… a huge raw power that don't have a magic base and, somehow, a feline nature." For the first time, her expression changed, breaking the stoiciness, to a confused one and she immediately looked at Rias who was just as lost as her, but she held herself together.
"What are you suggesting, Issei-san?" Rias asked
"I'm suggesting that your rook is a very interesting person. I might fall in love tonight." He said with a devious grin on his face, and a confused, slightly scared and blushed Koneko called him pervert again. He giggled with himself and looked to the group. Kiba was rather intrigued by his conclusions but don't let his appearance show much more than this. Akeno and Rias were with confused looks and exchanging whispers. Vali was red and grinding her teeth while looking at him, as she saw that his gaze was towards her, she started mouthing insults and other non-kind words to him, while he just ignored it.
"What are you saying, Issei-san? Koneko it's just a rook, well, she is indeed an amazing person but I don't think that you're being very clear." Akeno said to him.
"This spell is something that you might call a compass of magic, if you want to call it that way." Issei answered but the looks of the people's faces suggested that they weren't satisfied with it." The flame points to the source of power. There is many powerful figures in this room like Rias-san's brother; his bishop, MacGregor Mathers, which himself is a giant source of power; and a huge amount of devils in this room, yet, it pointed at her." He said, sighing in sequel.
"The slow waltz of the flames suggest that, or she is a very weak mage or she isn't a mage; and adding the fact that she is a rook..." Issei concluded." The feline part is self explanatory. I think."
The peerage became very uncomfortable as he finished his deductions towards Koneko. Indeed, it was very intriguing that someone that didn't knew nothing about them could tell so much about her persona without having previous contact with a Maou or someone influential in the devil's middle. But for their luck…
"Yeah, yeah, yeah. Just cut the bullshit and stop making the little girl uncomfortable with your golden compass." Vali started." Anyone strong enough could make this thing go nuts and start pointing strength to non-mage people, and as you said, there is plenty of strong people on this room."
The peerage sighed in relief as she proposed a rational yet simple answer to his thoughts.
"Yeah, whatever." He picked a small candy in his coat's pocket and he could feel, as if he was not feeling, a huge glare on his way. Koneko's big yellow eyes almost shined looking to the strawberry flavored candy on his hands.
"Okay… sorry if I scared you, Koneko-chan." He said, handling the candy to her, which she accepted with a pink face
"Ara ara, such a charming man towards the ladies."Akeno giggled.
"Such a dumbass!" Vali stated." This idiot took advantage because the Phenex asshole wanted my hand in marriage and that kind of bullshit, and made me went in visits to that fried chicken's home because he was crushing his little sister."
"Oi, that's not true. She just shared for my interest in magic.''
"Yeah, and she cooked for you, and you laughed together. I know what kind of magic is that."
"Someone is jealous..." Akeno whispered.
"Wait a moment, haven't you said… Phenex? As Riser Phenex?" Rias asked.
"Yeah… Why?"
"Well, My parents arranged a wedding with his and as you can guess..." Rias sighed." I'm suffering from your curse as well."
"My condolences." Vali answered, making her giggle.
"May I ask how do you get rid of him? Maybe Rias-sama could borrow from your experience." Kiba asked.
"Well, I challenged him to a different kind of rating game as only me and Issei could attend it. So it was me and empty head against the fried chicken and the bomb queen, or something I don't remember." She said." It took me five seconds to beat the idiot, as he underestimated me and I had some tricks." She said, proud of herself.
"And how long do you stood, Issei?" Koneko asked, while chewing the candy.
"Two seconds." Issei said, making everybody look at him at surprise.
"Well, she was half as strong as him, it surprises me that you took so long." Vali replied, angrily.
"You're just jealous that I went home earlier, and I wasn't so tired after it, right?" He teased.
"Well, if you had achieved your balance breaker first than me, maybe you were tired too."
"Indeed, but I achieved it faster, as usual."
They kept facing each other, Vali with a look of pure rage while Issei was smirking at her, with a teasing look on his eyes.
"You want the answer for that outside? I can beat you to find your damn answers."
"I want to see you try."
Now, the air was feeling heavier as the two were facing each other with death glares. And fortunately, or not, a third voice canceled the fight and draw the attention of the group.
"If it isn't my lovely bride."
"Speaking of the chicken..."
"Ravel-chan, what a dear surprise."
"Pervert."