Brought to you because I couldn't just leave it alone.

Rin had already begun to pull the sword out of its sheath before he even registered someone walking into the room and something being yelled. Before he had a chance to look, he was engulfed by blue flames exploding out from himself and the sword. He screamed in pain as he fell to his knees his spine aching and throbbing all over.
Whoever had walked in the door yelled as they were thrown back out again and against the opposing wall with a loud thud. More footsteps came running through the halls as the rest of the priests reacted to the noise.

Nagatomo and Maruta pulled an injured Izumi back away from the flames that surrounded the hall, they were slowly receding back into Shiro's room. They gathered at the door to see Rin on his knees, staring intently at the flames surrounding him. The unsheathed Kurikara on the floor. Nagatomo acted quickly once the flames had lessened enough to enter the room and quickly sheathed the sword again. The flames disappeared.

Rin snapped out of his trance and looked up at the priests, the looks of horror they were giving him had him recoiling into himself. His gaze moved to Izumi who was lightly burnt in places. Had he done that? He quickly stood up, causing the priests to flinch, before grabbing the sword from Nagatomo's hands and running back to his own room, slamming the door behind him.

"Shit!" Nagatomo swore; a look of guilt gracing his face as he looked at the doorway Rin had left out of. At least he hadn't left the building, Shiro would hopefully be back soon.

Rin returned to his room, slamming the door behind him. What the hell just happened?! He looked at the sword in his hands, he'd been surrounded by that same blue fire that he'd seen and played with, in the park. He'd hurt Izumi, by accident but still…the looks on their faces when he was surrounded by those flames was enough to tell him he'd done something very wrong. Something behind him caught his attention, waving back and forth erratically; he jumped in surprise. As he turned it followed him around before he grabbed hold of it.

Now, he hadn't been expecting to actually 'feel' the thing he'd grabbed on to but when he had, the pain of his fist clenched around the thing shot up his spine and he immediately yelped and let it go again. He moved to grab the thing again, this time more gently. Running his hands along the black length and bringing it around to his front sent a shiver through his body. On closer inspection he realised it was covered in black fur, with a soft fluffy end; it was a tail.

Rin suddenly couldn't breathe, falling into his desk and knocking everything to the floor. How the hell did he have a tail?! What happened when he pulled that sword?! He gripped hold of the frame of the chair in front of his desk tightly, trying to get his breathing under control again. The frame snapped under his strength and he moved to the bedsheets holding them over his face as if using them instead of a paper bag would help. Instead, he managed to scream into the sheets, using them to helpfully muffle the noise. After finally finding his breath again he remained still with his face in the sheets until his breathing slowed to a reasonable pace. His heart still pounding in his ears.

When he pulled his face away from the sheets, he spared a glance back at the offending new body part that had magically appeared. It was definitely attached to him as he could feel it. Every movement it made felt like an extension of himself, it was a strange sensation. Was that the only change though, or was there more? He bit his lip in frustration before gasping in pain once again as something sharp sliced his lip open, he froze to the spot. Suddenly catching his reflection in a small mirror that had fallen to the floor from his desk. Ignoring the blood dripping from his lip he moved closer to the mirror pulling his mouth open with his hands. His canine teeth had gotten bigger…and sharper, it looked like he had fangs. He moved his head around trying to find anything else different. He nearly missed it due to his hair covering the tips but they poked out just enough for Rin to notice the slight points on his ears. What did he do to himself by pulling that sword? Was he cursed? Why the hell did his dad hide something like that in their home?! He spent the next hour staring at the changes to his face and body going through various stages of panic before concluding he had cursed himself. He was finally drawn out of his thoughts by a loud knock on his door, he jumped, dropping the mirror onto his desk and dived towards the bed to hide under the bedsheets.

"Leave me alone!" he managed to choke out.

He didn't want anyone to look at him again, not after the looks the priests had given him earlier. He didn't want to scare anyone else.

"Rin, it's me. We need to talk!" The sound of his father's voice boomed through the door. The panic returned; he wasn't ready to face his father about this yet!

"I said go away, old man!" He growled, much to his surprise. Not that any of this deterred the old priest, opening the door and facing the young man now hidden in a fort of bed sheets, keeping his new features away from the view of his father. The sword was now hidden in the fort with him.

Shiro used a key and had been immediately transported to the Monastery from Mephisto's office. He could hear movement from the kitchen, so that was the first place he went. He found Nagatomo and Maruta tending to a somewhat burnt Izumi, they all stopped and froze when Shiro walked in giving him troubled and fearful looks.

Shiro looked confused at first, coming close to examine Izumi better, the burns weren't serious luckily but he'd injured his head as well.

"What happened?" He looked around taking in the dinner prep that had been somewhat abandoned amid tending to Izumi. They looked at each other, steeling themselves for the following conversation.

"Shiro, I think you should sit down." Shiro moved to grab a nearby chair, lowering himself down "It…it's Rin." A sense of dread overcame him at that moment and he abruptly stood again.

"Where is Rin now?"

"He's in his room…but Shiro before you go—" Shiro didn't hesitate if the burns were from Rin and he'd awakened then he needed to talk to him now more than ever. Before something more terrible could happen. He walked past his own room completely oblivious to the charred walls surrounding the door as he marched on to his son.

Standing outside Rin's door and was about to let himself in, but thought better of it knocking loudly. The panic in him building as he waited for an answer. He could hear something fall and rustling from the other side of the door.

"Leave me alone!" Rin let out a strangled shout.

"Rin, it's me. We need to talk!" Shiro put on his most authoritative voice, he was going to need it for the following conversation.

"I said go away, old man!" Rin growled back.

Shiro ignored the youth; opening the door and letting himself in. He turned to Rin, who was sat on the bed huddled under a blanket like it was a fortress. He sighed "Rin come out of there I need to talk to you."

"So, talk. Explain to me what this is." Shiro was confused for a moment before Rin shoved something out from under the sheet. His eyes fell upon the Koma sword, Shiro turned pale as he lost all feeling in his legs and dropped to his knees. Pulling the sword towards him and holding it in his shaking hands.

"Where…how did you get this?"

Rin didn't answer, staring at Shiro from beneath the sheets covering his form, still waiting for his answer.

"Rin, answer me. How did you get this sword?!"

Rin poked a hand out from beneath the sheets, in it he held a key; a key that looked very familiar to Shiro. His breath hitched as he recognised it as the same key he'd been panicking over losing just a few moments ago.

"I found this key in my room and…I figured out where to use it. Anyway, I found the sword locked away in your room. So, I want you to explain what the hell this sword is." Shiro could hear that Rin was struggling to hold back his anger right now and if he had already awakened then he needed to know the truth.

"Fine, but you need to take those sheets off, I am not speaking to you about this whilst you're hiding." Rin stiffened beneath the sheets, he was hiding for a reason and didn't want Shiro to see just yet… he'd already scared the priests enough for one day.

Rin shuffled the sheets further back so only his face was visible to Shiro, carefully bringing his knees up and keeping his mouth hidden from view. Shiro looked at him suspiciously.

"Rin, what are you hiding…?" He moved his hand to remove the sheet on Rin's head but Rin flinched away, only to be stopped by the wall.

"Don't! Please…not yet. Just explain what the sword is."

Shiro paused looking at the sword and then to Rin, putting the two together and realising the depth of the situation he'd come home to. It was no longer that Rin was seeing demons and may have awakened somehow…the look of dread returning to his face did not go unnoticed by Rin who just looked guilty in return.

"You drew the sword, didn't you?" His voice was a strangled whisper.

Rin nodded slowly.

"I only wanted to look at the blade…I didn't know…I didn't think anything like that would happen! I don't even know what came over me! It was like my body moved on its own!" Rin tried to explain, but it almost seemed like it was falling on deaf ears when Shiro just stared at him with a look of horror; his attention drawn to Rin's mouth. Rin noticed smacking his hand over it; covering himself up again, the feeling of shame drifted around him. "What happened to me?" he choked out.

The question broke Shiro out of his daze, this was still his son. His sweet rebellious little boy with far too much strength than he knew what to do with; his heart was still as big. This was not the demon he'd fought and sealed away that day; the one he feared would be released again when the sword was drawn. This was still Rin. His shoulders slumped as he sighed, relaxing a little.

"Rin it's okay, let me see, please." He asked calmly.

Rin slowly lowered the sheets he'd tangled himself up in, revealing to Shiro the slightly pointed ears he'd been hiding. He lifted his shirt a bit, to reveal a long black appendage wrapped around his torso. It unwound itself and wriggled freely behind Rin before wagging against the wall in an irritated and nervous gesture. Rin just looked down at the bed, avoiding Shiro's eyes.

"What did the sword do to me? Why was something like that even in the house? And those guns…what're they for?!" Rin cried question after question at Shiro, who gave a concerned look at the mention of guns.

"Guns? What guns?" Rin glared at him for even trying to play dumb.

"The guns in that cabinet; the guns under Yukio's bed. Why the hell does Yukio have guns?!" Shiro sighed, this was going to be a long day.

"You've certainly been a thorough little investigator haven't you…?"

"It wasn't like I could help it…the damn voice wouldn't shut up—" Rin stopped, taking note of the look of shock on Shiro's face. He sighed; he'd have to explain now… "I've been hearing a voice since sometime after our birthday. It's the thing that's been leading me to everything…it was how I found the sword in the first place."

"What kind of voice?" Shiro asked full of concern, was it Satan?

"I don't know how to explain it really. But whatever it was I felt compelled to follow it…"

"It wasn't talking to you or telling you to do anything?" Rin shook his head.

"No…it was just whispering that I couldn't make out. But I could sort of grasp what they wanted…"

Shiro groaned pinching the bridge of his nose. Where to start.

"You really should've told me Rin, if I'd known that I might've explained all this earlier. Before…" Before he'd drawn that sword and sealed his fate.

"You might have explained? You mean you had no intention of telling me-?" Shiro stopped him before it escalated.

"No, I had every intention of telling you, when the time was right."

"So, there is more to this than me just drawing a magic sword that I wasn't supposed to touch?" Shiro hesitantly nodded. "When exactly was the right time, old man?!" A flutter of blue flame rose from Rin's head as he got angry but he took a breath to attempt to calm himself down. He wouldn't learn anything if he kept getting yelling at him.

"Rin," Shiro began, the seriousness of his tone nearly made Rin flinch like he was being scolded. "The Koma Sword, Kurikara, is a magic sword that currently holds your Demon Heart."

"My what…?"

"Rin, you are the child of a demon." Rin felt like he'd been stabbed in the heart with those words. Coming from his own father no less. But he remained silent in his pain and Father Fujimoto continued speaking. "But not just any demon. The demon of all demons…you are the son of Satan himself."

Satan? As in King of hell, ultimate evil Satan? He was the child of the ultimate evil…he was a demon.

"What…I-I—" Rin kept opening and shutting his mouth trying to get the words to form but he was struggling against the raging inferno that was now bubbling up from inside him. His teeth clenched together as he gripped his hair, blue flames slowly leaking from his body shooting an almost murderous glare towards his father.

"So…everyone was right about me? And you…you told me I was human, you made me believe I was human?!

"Rin!" He placed his hands atop Rin's shoulders, risking the slight burns, looking him in the eyes "You are the son of a demon and a human. Your mother was human, and that makes you half-human." It seemed to work; Rin calmed slightly, flames receding back into his body. Shiro held back the sigh of relief.

"So, I'm both?"

Shiro nodded.

"Yes, you are both human and demon. When you were born, your demonic heart was sealed inside the Kurikara sword; you were separated from your demonic nature so you could be raised normally, as a human child." He picked up the sword and handed it to Rin. "The sword belongs to you."

"Wait… so the sword was mine all along? I didn't just unleash some curse on myself by pulling it out?"

Shiro gave a distant chuckle at the thought. If only that were the case…curses could be broken.

"No, this sword is the home of your demon heart. You must guard it with your life. The point was to never draw the sword and you'd be able to remain human." Rin frowned, too late for that now. Shiro leant forward and draped the key around Rin's neck.

"You can use the key to hide the sword again. It is important you keep it safe, and it does not fall into the wrong hands." Rin nodded "That sword is the source of your power, drawing it will release your flames. You must not let anyone see those flames."

"How come?"

"The blue flames are a sign of Satan if anyone knows who you are – either demon or human – you will be in danger."

"What about the priests? They all saw them when I…Is Izumi okay?"

"Izumi is fine, only a few burns nothing serious. But everyone here knows the situation Rin, we all raised you both knowing where you'd come from. Don't worry about that."

Both…

"Yukio…is he a demon too? Does he know? Is…is that what his guns were for? And yours?"

Shiro pulled his oldest in for a hug before he got upset or angry again.

"The guns are not for you. They are to protect you." He felt Rin relax in his hold "Yukio is human, he was too weak to sustain the power so it only went to you." Rin was mildly relieved but also somewhat jealous.

"Does he know what I am?" Rin's voice was muffled by Shiro's shoulder. Shiro nodded and sighed.

"Yes. Yukio knows. He has been training to become an Exorcist, like me. That's what his guns were for. He wants to protect you as well." Rin gripped Shiro tighter; feeling a sense of betrayal knowing that Yukio had kept this from him the whole time. "You're safe here Rin, none of us want anything to happen to you." Rin nodded hesitantly.

They heard a door slam from down the hall followed by some muffled conversation between the priests and whoever just walked in. Footsteps were then heard rushing down the hall towards the room. Rin tensed up in Shiro's embrace, he knew it was Yukio back from school; he was terrified of his reaction. He was afraid he'd see the same terror that had been on Izumi's face when he drew the sword earlier. His tail instinctively coiled around his torso again as Yukio entered the room.

"Dad what's—" His eyes drew to Rin, burying his face in Shiro's chest until something else caught his eye; his breath caught in his throat when he eyed the Koma Sword on Rin's lap. Shiro gave him a knowing look.

"What happened…?" The question hung in the air until Rin removed himself from Shiro and Yukio got a better look at him. A tail unfurling from around him. Rin met his eyes expecting to see fear but was surprised to see the pitying look he was giving him. "Nii-san…"

"What?" He snarled "I found a sword, I wanted to look at it. How was I supposed to know what would happen…?" He frowned at Yukio who in return looked back at him guiltily.

"It's not Yukio's fault, I made him swear not to say anything." Shiro scolded him but Rin just looked at his tail. "Like I said I wanted to raise you as a human. I wanted you to have nothing to do with that world for as long as possible."

He raised his head back to Shiro "What world?"

Shiro proceeded to explain to Rin everything about Assiah and Gehenna that he could. Rin listened but could still not quite accept the existence of demons, even though he was half of one.

He frowned a question on the tip of his tongue, not sure if he wanted to know the answer but better to ask than have more surprises later. He sighed.

"So, what happens to me now that I'm not human anymore?" It was a question with far too much weight behind it and Shiro wasn't sure how to answer. The fact was, he knew Mephisto was going to get involved since the sword had been drawn but wasn't sure if he could convince the demon to let Rin remain with him. The defences on the church weren't nearly as strong as True Cross Academy but they had kept him hidden for 15 years.

"Do I have to go to Gehenna?" Shiro immediately looked at him with a shocked expression.

"No! You are born of Assiah, and you will stay in Assiah." Rin had no idea what Gehenna or Satan was like, but he was at least relieved he didn't have to find out. He visibly relaxed before something else crossed his mind.

"But I can't stay here?" Rin stared at his foster-father intently waiting for his answer.

"I don't know what's going to happen. Currently only we know of your awakening, so you can remain here. But," He paused to make sure Rin was still paying attention and looking for signs of anger again "I will not be able to protect you forever, and plans need to be made. I need to figure some things out."

"So, there is a chance I will have to leave home?" Rin gripped his tail a little too tight causing a tremor of pain to slip up his spine. Shiro nodded with a sad look.

"Yes, but only for your own protection. It's not something I want to do. We will still be able to come and see you." Rin didn't say anything in response, he was angry about this but yelling was going to get him nowhere. Father Fujimoto looked guilty enough about this whole thing.

"Right, I need to go and make arrangements, I don't know if you will be able to return to school" Rin perked up a bit at that but was soon shot down "but I can try and get you home-schooled for the remainder of the term." He slumped back down and groaned.

"Rin, whilst I'm out please do not leave the Monastery."

"But!" He was silenced with a hand.

"No buts. If someone untoward finds you, human or demon and they know who you are…I dread to think what will happen. For the time being you are safe here, please just do as you're told this one time. I'll figure something out." Shiro pleaded with his son. He needed to speak with Mephisto and figure out where to go from here.

"Fine, old man." Rin frowned, settling himself back down to his bed.

Shiro apologized again as he left the room, shutting the door behind him; the twins were left alone in awkward silence. Rin slid his legs off the edge of the bed so he was sat facing Yukio, his tail thrashed behind him in irritation; Rin grabbed it and held it down on his lap before glaring at Yukio.

"So…" Rin began not taking his eyes from Yukio's "How long have you known?"

Yukio moved to sit opposite on his own bed he let out a resigned sigh. This wasn't going to be an easy conversation. "I found out about you and our…father—" he grimaced at the association of that word with the being he spoke of "—a few years ago. But I started my exorcism training when I was seven" He took note of the deepening frown on Rin's features.
"Nii-san, I've been able to see demons for as long as I can remember. Father Fujimoto offered to train me in exorcism so rather than being afraid of them I could fight them. He thought it would help me overcome them, and I wanted to get stronger. Even more so after learning about us and where we came from."

"You mean after learning that I'm a demon." The glare intensified

"Half-Demon, Nii-san. You are still half-human." Rin scoffed. Like that made any difference.

"So, you and the old man go around killing demons then? Since I don't think you need guns for counselling people on imaginary things, right? Is that the 'club' you've been going to every night?" This wasn't going well; Yukio could tell Rin was getting angrier the more this conversation went on. "Were you going to kill me too?"

"No!" Yukio stood abruptly at Rin's accusation. "Nii-san, I wanted to help protect you! Yes, I might've been scared at first, but I never had any intention to hurt you."

"I bet you were relieved."

"What do you mean?"

"To learn that you were human. That I was the demon. I suppose it made sense, me being the violent one. The one with a bad temper and always getting into fights."

"Nii-san, you know I never thought of you as a demon. Yes, I'm relieved I'm human and I admit at first, I was afraid. But even I could see you were the same old Rin after some time and I was more scared about what would happen to you when you did finally awaken. I hoped it never would…"

Rin sighed, letting go of some of the anger and irritation he felt for his brother. He cared about him too much to hold it against him. He rolled himself up in his bed sheets again, pulling them over his head. His tail pulled into the sheets and held close to his chest, some strange instinct to keep it close by and out of sight.

"I'm just gonna sleep the rest of today away since I can't go anywhere anyway. Tell the guys I don't want any food."

Yukio stared at the mound of sheets with a worried look eventually nodding with a noise of affirmation and left the room, closing the door behind him.

Rin listened as Yukio left the room and relished in the silence as he was left alone with his thoughts. At least he had planned to before the strange voice made itself known again.

I will probably go for a few more chapters of this xD. I don't plan on making it too long as there isn't a lot later canon wise that I could change.

Thank you for all the reviews/faves and follows :D - Please keep them coming as I love reading them!

I got a bit worried with this one since it was based off a song. But tried my best to incorporate it without any lyrics whatsoever. I'm tempted to incorporate 'Show Yourself' somehow, probably the last chapter...

~Tizzie