Hello and welcome to another chapter of 'So what if i'm a demon?'. I am writing this in school because I have a test soon and this helps me being less nervous. So yeah. Also, FUUUUUCKKKKK I BROKE MY PHONEEEEEEEE.

Also should I do shorter chapters and update more frequently or should I keep it like this? (4000-5000 words about once/twice a week.) Otherwise if I do shorter I might be able to update almost every day.

into the chap lol

---:o:---

Sin quietly walked up to class. Mephisto had already told Yukio that he had a special class planned, so he was standing besides the principal in the classroom. When Sin entered she got a message from Mephisto. "Would you like to have the theoretical part first or the battle first?"

"Theoretical", She quickly sent back. She grinned at him before sitting down in a empty chair. She had made sure that all of her daggers were dipped with Holy Water, but just on the tips so she wouldn't hurt herself. She had also counted them and put them securely to her sides.

"Mornin'", Shima said as the Kyoto trio walked into class. Sin sent him a nod before returning to her evil plans. After a while the two weirdos was in class. Rin came after that and the girls were surprisingly last. 

"Well then let's begin class. Today Mephisto had a suggestion so we will vote. He wants us to see Rin and Sin go all out in a battle until one gives up or looses ability to fight. Flames and weapons will be allowed and we will watch from a safe distance.", Yukio started. "Everyone who is in for the idea, raise your hand."

Everyone except for Shiemi and Konekumaru raised their hands. Sin smirked at Rin's stupidity. She decided to give him a hint, so she spoke in the demonic telepathy language which only demons and half demons could hear. "You might have stronger flames but that does nothing when your opponent has more control. You need to use your brain to win this battle." Sin turned towards her with wide eyes. She smirked and twitched her tail. Mephisto sent her a look of amusement, before turning towards the rest of the class. 

"Off we go then! Eins, Zwei, Drei!", he chanted. The students were sent into a big arena, which Sin happily ran up onto. She had put on a pair of jeans shorts and a t-shirt. She quickly put her tail around her torso, earning a confused look from Rin. She sent him a smile when he walked up onto the arena, Kurikara in his hand. 

"Well then class. You may not interfere and I assure you that if someone is in real danger I will stop the battle. Since Sin is more trained she wont use her flames. This round at least...", Mephisto said. Izumo raised and eyebrow while the others looked at the two half demons preparing for battle.

"The battle will commence in three.. Two.. One.. FIGHT!", Yukio exclaimed. Sin immediately kicked away from the ground and put on top speed, reaching Rin in a second. He had his both hands on the Kurikara, preparing t unsheathe it. Sin kicked it away and grabbed it. She smirked before unsheathing it. Rin obviously got mad and jumped for her. Sin grabbed some daggers and threw them his way, two out of three hissing him in the legs. 

As Rin pulled the two out Sin had already got to him again. She watched as Rin lunged her way before holding the Kurikara out in front of her. Rin widened his eyes in fear and tried to stop, but gravity doesn't work that way for an untrained demon. He landed with the sword straight through his chest. Everyone gasped except for Mephisto. Surprisingly he didn't stop Sin as she crouched down before the demon.

She whispered something to Rin, before pulling the sword out from his body and handing it to him. He managed to grab it and focused on healing for a bit. Then he attacked again. Sin threw her daggers to the side. She decided to go without any weapon, knowing it would annoy the hell out of Rin.

Rin stabbed Sin in the shoulder. She didn't fight back. Rin pulled it out and suddenly jumped away, turning tail. Everyone else were staring at the two, wondering what just had happened. Sin stood up and let her tail come out. She sneered at Rin, who backed down in fear. 

She knew she had a stronger aura, since she was older and more trained. She had just let it all out onto him. Rin backed until he reached a wall. He gulped. Fear was evident in his eyes, along with confusion. He was sent another wave of her aura along with a glare and put his tail between his legs.

"I GIVE UP!", He shrieked on top of his lungs. Mephisto smirked. Everyone was looking at him in confusion. Sin raised her tail showing that he heard. Rin slowly backed towards the group, before turning and running away, tail between his legs in fear.

"Oi Rin what happened?", Shima asked. "I-I..", Rin began. He had fear in his eyes. When Sin had gathered her daggers and started walking forward, he whimpered and hid behind his younger brother. Mephisto walked up to him and patted his head.

"What you felt was Sin's aura. Since she is more trained and older then you, her's is way stronger than yours. She just let you have a taste. You could say she's your superior right now. When she let's her aura out like that, it is best to obey her unless you believe you are stronger.", Mephisto said. Everyone turned towards Sin, who was toying with her tail. She looked up and sent them a questioning gaze.

"What?"

---:o:---

Sin was walking down the dorm hall towards the showers. She met Rin outside it. Raising an eyebrow, she walked up to him. Rin bowed down and put his tail downwards in respect. 

"Please help me control my flames!"

Sin looked at him a while. She then raised his head and sent him a nod. "Want to join me in the shower? I need to talk with you anyways." Rin hesitated before nodding. He was still a bit afraid of the older demon. "No need to be afraid. I can smell your fear. When you are trained chances are your aura will be stronger.", She said. Rin nodded and the two walked into the showers. 

About five minutes later and they were both about to go for their tails. Sin sat down behind Rin, his back were facing her so he had no clue. She suddenly grabbed his tail earning a 'yelp'. "What are you doing!", Rin exclaimed. Sin ignored him and began looking through his fur until she found what she was looking for. A pink spot.

"Damn it Mephisto...", She whispered. She sighed and let Rin's tail go. "Oi, during mating season, make sure to never go out without someone to accompany you. It could be anyone you trust. Although I don't recommend Mephisto.", she said. Rin nodded. 

"Oh, by the way.", Rin said turning around. Sin sent him a questioning gaze. "When did  you get that tattoo?", he asked. Sin looked towards where he was pointing. It was a text across her chest. 'Belongs to Samael ⏳' in pink ink and black outlines. Sin almost choked as she remembered what had happened two night's before.

Flashback (warning for small sexual content):

Sin had been called to Mephisto's office. She was standing outside and knocked on the door. Mephisto opened, which was unusual- usually he opened it using some magic or something. He motioned for her to sit down in the pink couch in the room, before opening his mouth to speak. 

"Since you will be affected by the mating season this year I decided I will mark you as mine." Sin stared at him. "How will you do this?", She carefully asked. Mephisto smirked. "By taking your virginity of course. Now strip!" Sin stared at her guardian.

"No fucking way! I want to choose who to fuck first my self!", She exclaimed. Mephisto sighed and snapped his fingers, tying the female's hands to her back. He snapped them again and her clothes were gone. Sin widened her eyes as she realized what he had said was true.

Mephisto walked up to her and carefully took off his gloves, putting them aside. He began rubbing his thumb to her cleft and she let out a soft whimper. 

"PLEASE MARK YOURSELF SOME OTHER WAY!", She shrieked. Mephisto paused. "Well what 'other way' do you have to suggest?", he asked. "I don't know! Can't you steal my first kiss and it's enough?", She said. Mephisto put his finger on his chin in thought.

"I have an idea. You let me tattoo 'Belongs to Samael', on your chest and I steal your first kiss, or I take your virginity. You choose.", He said. Sin of course went with the first choice. Mephisto snapped his fingers and Sin's clothes was back as well as her hands being free. He began with the kiss, sliding his tongue into her mouth and exploring it. After a while Sin relaxed and sunk into the kiss.

When done Mephisto smirked as the demon in front of him gasped for breath. "Well then, I'll get the stuff and you undress. You may keep the pants on.", Mephisto said. He went to some  other room while Sin did as he said, knowing it would be dumb to fight back.

Moments later Mephisto returned with an tattoo gun. He had picked to do black outlines and use pink to fill the letters in. Sin lay down and prepared for the pain. Mephisto put in the black ink and began the painful procedure. After a while Sin wished she had just chosen the other choice. 

The worst part was probably going to be the coloring. Sin groaned and yelped in pain. Her tail and legs were twitching and she was gripping hardly onto the couch. When Mephisto was done he stood up to look at his 'masterpiece'. He decided he was done and left to get some wrapping to put on.

"Keep this on until tomorrow. Also, here. Use this after showering every day for about two to three months.", Mephisto said giving her a salve. "Don't use hot water. Keep it about at the middle. Maximum is twenty five degrees Celsius." Sin nodded and let him wrap the new tattoo before standing up. Since she hadn't really gotten to see the tattoo she closed her eyes as she put on her shirt, skipping her sports bra to avoid something pushing onto it. 

Sin wrapped her tail around her and left the room, vowing to never speak of the moment again.

Flashback ended

"Long story. Promised not to tell. Sorry.", Sin quickly said. Rin sighed and nodded, before massaging her tail. The two washed each others tail before leaving the showers. Sin dried her hair and put on a over sized t-shirt. She wore a pair of shorts and decided to go barefoot, since she would go to sleep soon anyways.

A while later she was laying down on her bed. She decided to do some homework before earning a good two hours of sleep. Waking up at about six (yes she did her homework until 4 in the morning, Yukio is evil), she decided to make her own breakfast. 

"Morning Ukobach.", she yawned seeing the little demon. She was sent a similar reply before the demon returned to making breakfast for the guys. Sin had went without a top today, since she was flat chested anyways. Shima would probably notice, but Sin didn't care. She had sent Mephisto a letter the other day, asking for a male uniform since it would be easier to hide her tail that way. Today she had gotten it and was proudly wearing it. 

Sin had curled her tail around her torso and was done with eating when Yukio walked up. "Can you try to wake Rin up? I failed.", he said. It was clear he was still tired and sleep was lingering in his voice. Sin nodded and handed her used plate to Ukobach before heading towards the twins' room.

"Oi Rin, wakey wakey!", She said. When Rin didn't move she decided to scare him out of his sleep. She released her aura and Rin abruptly sat up, eyes wide. Sin lowered it again and giggled. "Morning sleepy head. Yukio sent me to wake you since he failed.", She said. Before Rin could scold her for waking him she skipped out of the room. 

Since she didn't have any normal classes she decided to spy on the younger twin the whole day. She didn't care about the scolding which were incoming pretty soon....

Okay guys! I decided to try making a shorter chapter. LIKE AND SUBSCRIBE LOL BAI