So this user named Kitten1134 wanted OC's to draw and here's Sin!!! GIVE THEM A ROUND OF APPLAUSE! Also Kitten-chan wrote a great Blue Exorcist fanfic so go check it out! Btw she did this like some week ago but I forgot to post this lul srry Kitten.

Chaptermon, GO!

FIGHT!

Sin immediately lunged forwards. She had put her brown hair in a braid, making it easier to fight and harder to get in the way. Suddenly Shura jumped to the side. Sin landed and made a 180 turn right towards her. 

"I ain't stupid...", She growled. Shura smirked and grabbed her sword, mumbling something about some princesses. Suddenly Sin stopped moving. She lowered her head and Shura raised an eyebrow, on guard. When Sin looked up again her iris was blue and ragged, a red pupil taking the black one's place. 

Sin had a scary smile on her face and when her eyes met Shura's it sent chills down her spine. The only thing those eyes showed was blood lust and madness. And that is not a fun combination.

Suddenly the demon charged forward, barely visible to human eye. She reached Shura, who barely had any time to dodge. Sin didn't leave any pause between movements, though. Charging into Shura, she let out a snarl and pinned the woman down. Shura tried to get up, but was immobile. 

Sin once again snarled in her face, baring her fangs. Shura was unsure if she was in control anymore, so she decided to give up and see any reaction. First though, she wanted to see if Sin was going to do anything. 

Sure enough, the demon did something. Sin stared deep into Shura's eyes. However, now there was amusement in them. The madness and blood lust had somehow disappeared. Or maybe it was just an act?

The demon suddenly let her hands go, falling on top of Shura. She kissed the woman's neck and began nibbling on it. Soon enough there was a hickey or two on Shura's neck. Sin jumped off of her offer and lowered her hand to help Shura up. The exorcist took her hand and got pulled up. 

"Damn you're a good actor. How did you make that blood lust and stuff in your eyes?" Sin shrugged. The thing is, that hadn't been an act. She had actually lost control. "I guess i am just a good actor and the demon eyes helped out?", she lied as she deactivated her demon side. She was a good liar too, though. 

After a while the two women went to shower off the sweat and so that Shura could talk a bit more to the mysterious demon. When Sin started walking into the showers Shura staring at her tail. Sin had kept it wrapped around her torso in battle but now it swayed free. The demon sent her a congused look.

"What?" "Can I, you know..?", she asked. Sin nodded and walked up to her, holding her tail up to Shura's face. It was not that part she was interested in though. The woman kneeled down and began looking at the base of the tail. She put a finger on the top and a small squeak of surprise left the owners mouth. 

Shura began rubbing her finger at the point where the tail came out, looking at Sin's reaction. Her tail was twitching and it had curled up at the upper part. As the fingers slid further out on the tail the more Sin began to relax again. When Shura began massaging the long fur at the tip however, she let out a soft moan. Shura grinned.

She began massaging deeper into the fur, in a quick pace. Soon enough Sin started to twitch her body. Shura smirked. "A-are you done yet..?", Sin asked, feeling embarrassed for the first time in long. 

"Maybe, depends on how good you are at following orders..."

( ͡° ͜ʖ ͡°)

Sin raised an eyebrow. "What kind of... Orders..?" She did not feel so tempted to do what ever Shura would order right now. "Well I want to try how much self control you have. Lay down.", Shura ordered. Now Sin understood.

She did as told, acting like she had no clue what the weird woman was planning. Shura crouched down. "Lie on your back." Sin did as told, seeing a she had laid down on her stomach. Shura grabbed one of Sin's feet and began tickling it. Sin twitched and her whole body tensed. 

The flame haired woman tickled even more and Sin could barely hold it. Soon enough Sin's back arched and she began laughing. Tears were at the bring of her eyes and she pleaded for Shura to stop. 

"Hmph. Not bad.", Shura said. She decided that was enough and let Sin stand up.

LOL I bet y'all imagined something else xDDDDDD

"Now let's get showered and something to eat.", Shura said like nothing happened. Sin started the water and began showering. Shura inspected her as she washed her tail, making her uncomfortable. 

When both of them was clean they put on clothes and went to eat dinner. Sin had asked Rin to make some when she dressed up (via text you dirty minded freaks). The two girls walked down campus towards the old boys' dorms, talking about random stuff. 

Rin had prepared some stew and it smelled amazing. Shura immediately got to her seat and began digging in, while Sin decided to wait until everyone had grabbed something. During the meal Shura and Yukio talked about exorcist stuff while Rin and Sin talked about the upcoming training camp. 

"So, Rin. What meister are you going for? Knight?", Sin asked. Rin nodded. "You?" Sin put her finger to her chin in thought. "Well I use daggers, so knight. But I might also go for something else, I dunno.", she answered. Rin 'Hmm'ed and took another piece of meat from the stew on his fork. 

"So, Rin. Why did you want to know about father that one time? I get you are curious, but don't you hate him?" Now Yukio and Shura began listening to their conversation. "I guess it's because I want to know why he did what he did and stuff like that. I don't believe he did only bad things, because that would just be weird.", Rin answered. Yukio began getting mad at his brother and was about to speak up but Shura grabbed him, wanting to hear the demons' conversation.

"Oh. Well a good point, I guess. But I was really surprised when you showed up at the tree and asked me.", Sin said. Rin nodded. "Hey I still have that book. I finished it like a day ago so you can have it.", The female demon said. Rin's eyes lit up. "Really? Great!"

"Let me go get it.", Sin said and ran to grab the book from her bag. Shura and Yukio started talking as soon as she left so it seemed as if they hadn't stopped. After a while Sin returned with a old brown book. She handed it to Rin, who gave her a 'thanks'.

Shura, who sat beside Rin, peeked over his shoulder a the book. The title was 'The Story of Satan and his Flames'. Suddenly Sin spoke up again. "Oi Shura if you want I can get you a copy of the book? But then again you probably already read it, since you are a full exorcist." 

"Oh, nah. I was just wondering what book it was. The ones we read were newer.", Shura said. Sin nodded while Yukio wondered how the fuck they were just talking about it normally. Sin noticed his behavior and turned to him.

"Dude I get that you don't like Rin learning about our dad but seriously you are probably as curious as he is. The only reason our class and your class never read it is because you and Rin are Satan's children.", She calmly said. Yukio was even more mad now. 

He stood up and left the table, not even thanking for the food. "Someone's on his period..", Sin mumbled. Shura began laughing and Rin spit out some water. This made Shura laugh even more. Sin joined in and soon Rin too. They talked about memes and stuff, since Shura surprisingly watches those too. After a while everyone went to sleep in their rooms. Apparently Shura and Sin would share because Shura hadn't gotten her key yet.

---:o:---

Sin lay restless in her bed. She was bored and tired. But she did not fall asleep. After a while she decided to get some fresh air, so she went to the roof. Walking up the stairs she hummed a quiet tune. She climbed the ladder to the roof and went out into the fresh cold air. Sin sat down at the edge, legs dangling under her. 

"Oi, Brat. What'cha doing here?" Sin turned around to the source of the voice. Shura. Sin twitched her tail. "Nothin' much. Can't sleep." She heard a 'hmm' beside her and turned her head. The flame haired woman sat beside her in a robe, looking out over campus. 

"Nightmares?", Shura asked. Sin shook her head. "Insomnia." Shura raised her eyes a little, making an 'oh' sound. They sat quiet for a while before Shura threw something at Sin. She raised her hand and left the roof, leaving a confused demon behind. Sin looked at the thing Shura had thrown. It was a small wooden box, with her name engraved in it. Sin raised an eyebrow and opened the box.

Inside was a small letter, along with a leather bag. Sin grabbed the letter and read it.

'Hello Sin. I just want to say some things to you. But well, it would be awkward eye to eye, ya know? Anyways, I just wanna tell you that if ya need help during the coming period, I can always help you a little. If you want, of course. We could always have a code word for it? I came up with one. 'Blex'. BL, from the word BLue as in your flames. And of course EX from EXorcist. Like it? Sounds ok i think. Anyways, that's all. Wanna talk? Here's my number. Oh and I left you a gift. It's meant to be braided into your tail fur, thought it would look nice on ya. 

-Shura'

Sin rolled her eyes and looked into the bag. Inside it were a blue ribbon with a silver bell on it. Sin smirked and took the long ribbon and began braiding it into her fur, ending it with the small black rubber band which had come along in a pack filled with twenty of so of them. Sin raised her tail and twitched it, making the bell to a melodious sound.

Sin braided some more pieces of fur, before deciding to go inside. She put the bag inside the box, which she tucked into her pocket. The demon walked into the dorm, the bell on her tail quietly tingling.

After a while of gaming, watching anime, spying at the sleeping Okumuras and staring into a wall, the time was 6:30 in the morning. Sin knew Yukio would be awake by now, so she went into his room. As she thought, only Rin remained in it. She sat down on his bed, watching in amusement at his sleeping form.

He was laying on his side, hands together at his chest. His legs were twitching sometimes, along with his tail. Sin guessed he was dreaming about running or something. Then she got evil. She raised her tail above his ear and began shaking it around, making the bell tingle. 

Soon enough Rin woke up, and stared at Sin. Said demon smirked and left the room, the bell tingling on her tail. The female demon walked into the cafeteria and grabbed something to eat, Shura soon joined her. "Blex sounds like a good code word, by the way.", Sin said while chewing on her sandwich. Shura nodded and sat down in front of her. 

Her eyes were following the bell on Sin's tail. Just 'cause the demon shook it slightly, making the light sound. Shura smirked. "Dude you are gonna annoy the shit out of Yukio in class. You HAVE to wear it!", she exclaimed. The two girls began their evil laugh and didn't notice when Yukio got into the room. He looked at them with question in his eyes.

"Should I be worried?", he said looking at the two maniacs. The two girls shut up and looked at him. "Nah, just talkin' about annoying the hell out of you!", Sin said. She had quietly put her tail on her lap, making sure the bell was quiet.

"If you plan on blowing up the classroom AGAIN I will report to the other teachers.", he said glaring at Sin. "Wait she did that?", Shura asked. When Yukio nodded the two girls began their evil laughter again. Rin appeared in the room and was rubbing the sleep from his eyes. 

"What is going on here?"

"I think they are plotting something."

"Oh."

Rin grabbed his phone and began recording, before sending it to all the cram school students. He also texted them 'meet your new teacher, she is plotting something and I think Sin is included'. Yukio face palmed and grabbed his breakfast before leaving the room.

Rin walked into the room and sat down beside Sin. The two females stopped laughing after a while, but they still had that evil glint in their eyes. "What'cha planning?" "We are gonna annoy your twin to death." "I'm in." Sin looked at Shura who had a grin on her face. She handed Sin another one of the bell ribbon thing, which the demon took. 

"Gimme your tail.", Sin ordered. Rin swung it up to her face and she grabbed it and begun braiding the bell in. Rin's fur was a lot shorter, but after some struggle she managed to do it. "Okay so when we get to Yukio's class, we are gonna bring these out and we will start wagging our tails around. Sounds like a plan?", Sin explained. Rin made a thumbs up and the three people in the cafeteria high fived.

"This will be so damn fun!"