Rin had now explored every nook and cranny of his room…and was now laid back on his bed tracing the patterns of the ceiling in the air with his finger. He'd managed to find a change of clothes in the dresser. He was now wearing black jeans with a chain and a dark blue t-shirt. He also found some black combat boots and a white hooded jacket. The jacket was long at the back, past his knees, with a split in the middle which seemed convenient for his tail. He wondered who picked out the clothes, and where they had come from. But didn't dwell on it thankful to have something comfortable to wear other than a formal suit.

But now he was bored, he wasn't sure if he was allowed to leave his room or even if he wanted to. He'd probably get lost trying to navigate the castle and he wasn't paying much attention earlier when the guards had escorted him to Satan. He just felt like he was waiting for something to happen, like if he waited long enough someone would come to save him. He imagined Father Fujimoto, Yukio and the priests coming to his rescue, bashing down the doors and killing all who stood in their way… but no one was coming. He was alone down here and, in a place where humans couldn't follow.

He looked out of the window to the purplish-red sky. He could see a bright red sun or was it a moon… he couldn't tell if it was day or night, did they have day and night in Gehenna? He let out a long sigh, he missed the blue sky. It made him realise why demons wanted to go to Assiah, and he wondered how long he had before Satan got fed up with waiting for his chance. What exactly would he have to do for Satan to keep him happy? The thought made him dread what was going to happen to him down here.

Flopping back on his pillow he stared at the demon heart still floating above his chest, calm blue flame fluttering around it. Why did something everyone made out to be so evil, look so beautiful?

Was he evil just because he was a demon? All this crap was giving him a headache…or maybe it was those horn nubs on his head…either way his head hurt. He closed his eyes briefly before a clang of metal outside the door sent him bolt upright. A loud bang on his door followed, and another before the door was kicked open. Bright red flames burst through the door as two figures walked into the room.

Instinctively Rin's own flames surrounded him and he failed to suppress the growl that resonated from his throat.

A female voice laughed within the red flames before the fiery woman emerged, followed by the green-haired demon patting off a few flames from his already tattered jacket, looking rather annoyed at the woman.

"Did you have to flame up so much?" Examining his jacket with a pout.

"Oh please, a few more holes in that rag won't hurt" She huffed, rolling her eyes at the other. She stood there confidently in an outfit that reminded Rin of a slave-girl Leia.

"Father might be upset you killed the guards." The green-haired demon said looking back at the charred bodies on the floor.

"Tch, they can be replaced. They should've known better than to get in my way and deny me access to my little brother." Finally turning her attention to Rin, a moment of awe crossed her face at the sight of the blue flames surrounding him, before carefully morphing into displeasure.

"So, it's true. The Runt does have father's flames-" She scoffed. Rin growled in response; bearing his fangs – his instincts acting on their own "-and a death wish as well it seems."

She started towards him glaring with contempt.

Coming to his senses, Rin began backing up, but wasn't fast enough when the fiery demoness jumped and landed behind him grabbing his tail. She pulled and Rin yelled falling to the floor in pain, flames dissipating. Still holding on to his tail, the demoness dug her stiletto heel into Rin's back and knelt down on the other knee beside him. Leaning in close to whisper in his ear.

"Father may have let you live for now dear brother, but I'm sure he will tire of you soon enough. And when he does, I will relish making you squirm…" She licked the side of Rin's face, he shuddered at the sensation. She stood up and released Rin's tail.

"Now get up, Runt."

He wasn't too fond of this new nickname…

Rin managed to push himself up to a sitting position, leaning his back on the bed. He wiped his face of the moisture left behind and glared up at the demoness before him. She crossed her arms; cocking her hip to the side and glared right back.

A crunch from the doorway drew them both out of the awkwardness. They both looked to the green-haired demon casually crunching on a lollypop, whilst watching their exchange.

"What?" He said tonelessly with another crunch.

Rin suppressed a laugh. The female sighed and rolled her eyes, looking back to him, lips twisting into a smile.

"So, I take it you're not here to kill me then?" Rin spoke up, looking back to the woman.

"Hmph, Father would have my head if I harmed his precious Son." She let out a disgruntled sigh.

"I don't think he'd care that much, as long as my body is in one piece…"

"Yes well, in this case, Father has requested me to train you. I will not disobey his orders." The woman grimaced.

"Train me with what exactly?" Rin questioned.

"What else?" She fired up her flames and they danced around her effortlessly. "My name is Iblis; I am the Demon King of Fire. I am to help you master control over your own flames."

"Who is he then?" Rin asked pointing to the green-haired demon stood by the door. The demon took note of his inclusion and walked over to stand with his fiery sibling. Crouching down in front of Rin at eye level.

"I'm Amaimon, Father asked me to play with you." He gave a hungry smile which in turn sent shivers down Rin's spine. He leant in closer invading Rin's personal space "Do you want to play?".

Rin gulped and shook his head "Not really…"

Amaimon pouted and let out a disappointed whine. "No fair."

"Patience, Amaimon." Iblis grabbed Amaimon's collar and pulled him back from Rin, he let out a sigh of relief. Amaimon grumbled something in response but Rin couldn't hear it.

"Now, on your feet Runt. Follow us." Iblis and Amaimon moved back towards the door.

"My name is Rin, not Runt" Rin shouted back in annoyance.

"Ri- Oh my that deluded witch even named you after Father…" Iblis rolled her eyes and began to walk to the door.

"Witch? Wait, how am I named after Fa-Satan?" Rin caught himself before repeating Iblis, he wasn't prepared to accept Satan as anything more than the demon he was. Rin managed to stand and walked towards Iblis and the door.

Iblis paused and looked back at him thoughtfully for a moment.

"When Father first appeared in Assiah, your Mother had given him the name 'Rinka'. It was only after he had developed an ego of his own, he became known as Satan. So, in a way she named you after Rinka."

"So, you knew my Mother?" Rin almost looked pleading, he'd never wanted to know always taking whatever Shiro had told him to heart and not prying further. But now that the information was so close, he almost wanted to grasp at it.

"I am not here to talk about the Witch." Iblis grimaced.

"Don't let Father here you calling her that." Amaimon chimed in.

"Father already knows my stance on that subject." Iblis growled back. Amaimon shrugged in response.

Rin was confused, he had no idea what they were talking about but apparently, his Mother was a witch. He wasn't sure what to think about that. Satan would know more, but he didn't really want another talk with him. Satan hadn't seemed too enthusiastic to talk about the past either. A story for another time he had said.

Rin was dragged out of his thoughts by a slap on the back of his head. He looked to Iblis who was standing by the door, Amaimon was stood next to him and had been the one to knock him in the head. Nodding towards the door, Amaimon grabbed Rin's shoulder and pushed him into the corridor.

Rin took in the scene in front of him. Charred remains on the floor of two large bodies, blackened armour and walls like an explosion had taken place. The smell of charcoal was fresh in the air. Rin took care to walk around the bodies not disturbing what remains were left, covering his mouth as he did so. Amaimon didn't have the same sentiments when kicking the armour aside and walking through the charred bodies causing them to crumble beneath his feet. Grabbing another lollypop from his pocket and casually sticking it in his mouth. He noticed Rin watching him and pulled out another, offering it to Rin with a blank look on his face. Rin hesitated whilst trying to process the situation in his head.

The Demon King was offering him a lollypop…

Before he had a chance to refuse Amaimon had shoved the lolly into Rin's pocket and marched off to walk with Iblis.

He honestly wished he'd just left his room now when he had the chance. Since being lost in this castle seemed the better option than wherever he was headed with these two, and whatever they had planned for him. He contemplated the idea of running in the opposite direction, but decided that would probably land him in even more trouble when they caught up to him…

Rin had no idea where they were headed, but he was sure if they had been headed back to the throne room again, they would've been there already. No, the corridors also looked somewhat different, if anything it seemed like it was getting lighter. Were there more windows here or something.

Before long they had arrived at some large double doors, larger than the ones to the throne room it seemed. They were made of solid weighted metal and seemed like nothing would budge them. Rin looked to Iblis and Amaimon who both seemed to be waiting for something. Suddenly with a loud groaning creek, the doors began to open inwards, the light from inside the room nearly blinding Rin.

Inside the doors was a huge Arena, Rin gulped. He wondered how this fit into the castle as it looked huge, the ceiling was high enough it seemed like you could fit another castle inside. There was a large seating area going around the arena and a few balconies above that. There seemed enough seating to fit a pretty decent sized audience, but it was empty. At least all but one seat was empty, sat in the highest seat in the centre of his own personal balcony, was Satan. He sat there silently watching the Arena, his eyes focussed on Rin, who immediately turned his gaze away.

He looked behind at the closing doors, only then did he notice all the scratches…no, deep claw marks going up the length of both doors. Rin felt something drop in the pit of his stomach, what was going to happen here.

Iblis bowed down in respect to her father's presence. Rin stood awkwardly behind her before Amaimon had grabbed his hair and kicked the back of his knees. Rin forcefully fell onto his hands and knees; head pushed to the ground by Amaimon now also bowing. Rin pulled his hands into fists, scraping the dirt from the arena under his nails.

Satan sneered, and promptly gave a nod, Iblis and Amaimon stood again. Rin, dragged back to his feet, was then pushed into the arena by Amaimon.

"Stand in the centre of the arena." Iblis ordered.

Rin hesitated but did as he was told. As much as he hated it, he was out-numbered by two older and stronger demons and Satan was watching too closely for comfort. He reached the centre of the arena sparing a glance to Satan in the distance, before looking back to Iblis and Amaimon.

"Right, now I want you to summon your flames."

Summon his flames? How the hell was he supposed to do that? He'd only just got them and they seemed to have a mind of their own most of the time. He closed his eyes and tried to concentrate as if hoping they would just appear on their own. But nothing happened.

Satan looked rather displeased.

"What's wrong? You had no trouble earlier." Iblis shot him an irritated glance.

"I-I uh don't really know how to summon them at will. They just happen when I'm upset or angry. Like a reflex I guess."

Iblis groaned pinching the bridge of her nose "Ugh, infants…" she muttered to herself.

"Because you have been separated from your Demon heart for so long your powers are behaving like an infant's. They act on instinct and are led by your emotions. The more you use them and train with them, the easier they will manifest and your control will improve."

Rin nodded as he looked down at his heart.

"Also—" Rin looked back up to Iblis as she spoke "—the sooner you come to accept your demonic nature, the sooner you will master your power." Rin grimaced at that. He still wasn't prepared to accept the whole being a demon thing. He'd never asked for this power he had just wanted to be accepted. His family had been the only ones to actually accept him for the way he was growing up, at least that's what he'd thought…until his powers awakened. Now he just felt back at square one with even more problems if he couldn't control his flames.

"But right now, we need to see what these flames of yours can do, and if you can't summon them, we'll have to force them out of you." She shot him a cocky smile.

"Wait, what? How do you—"

Looking around for a moment she suddenly fixated on Amaimon. Smiling eagerly at him.

"Amaimon, if you would." She snapped her fingers pointing towards Rin in the middle of the room.

With that, Amaimon's ears perked up and he smiled excitedly. Rin wasn't sure what was happening until Amaimon jumped towards him claws outstretched, Rin just about dodged before yelling back at Iblis.

"What the hell?!"

"As I said, I want to see how strong your flames are, I need to see what I'm dealing with." Iblis shrugged and jumped up to the balcony with Satan, propelling herself with her own fire. Rin was now left alone in the arena floor with Amaimon, who had a hungry look on his face. He turned his attention back to Rin and grinned and big toothy grin before launching himself across the room towards him.

Rin's instincts finally kicked in and his flames manifested themselves around him enough make Amaimon hesitate briefly before continuing his attack. Rin had been in plenty of fights throughout his life, he was happy that he knew how to fight, especially now. But this was different, he was fighting a demon. Not just any demon either, this was a Demon KING and one that particularly loved to fight from the looks of it.

If Rin tried to block, Amaimon could slash his arms with his claws. He could tell he was super strong as well. The only thing Rin seemed to have that might deter Amaimon was his flames. But even as they were, they didn't seem too threatening to him, he needed more. Right now, Rin was nothing but a stronger than average human with blue flames that he couldn't control.

Amaimon lunged at Rin; claws outstretched, leaving him no time to dodge. But Rin managed to grab Amaimon's arm with his claws about an inch from his face. Without hesitating, Amaimon swung his leg into Rin's stomach knocking him across the arena and into the wall with enough force to cause a crack. Rin managed to push himself onto his hands and knees. He coughed up a metallic tasting fluid and spat it to the ground, the bright red contrasted with the dull sandy floor.

"He sure can take a beating I'll give him that." Iblis stated as she overlooked the fight below. Amaimon was giving Rin no chances to fight back, his flames still a flicker around him barely enough to be a threat.

"What is your plan here, Iblis?" Satan spoke not taking his eyes off of Rin.

"I'm sure you sensed it too, didn't you?" She looked down to Satan. His interest piqued; he finally drew his attention away from Rin.

"I did. First when I broke that sword. Then briefly again during our chat in the throne room. He seems to be unconsciously suppressing it though." Satan turned back to the fight scratching his beard.

"Hm, I felt it when we broke into his room, he flared up in a defensive manner. I don't suppose it helped he was still fairly weak when his heart was unsealed, he was out for nearly a week."

"No, but it had to be done. The sooner he gets used to this power, the faster he will become a stronger vessel for those flames. That and sending the broken sword back to Samael was a perfect way to send a message." He grinned to himself. "I take it he'll need new guards by his door, I had heard the lower demons complaining of an explosion…"

"They got in my way." She said without flinching "In regards to Samael, Amaimon said he was rather… 'pissed' at your interference with his plans. But I'm sure he has other tricks up his sleeve. This is Samael after all." Satan nodded in response. "Do you still plan to use the boy's body, when it's ready?"

Satan didn't answer, choosing to sit in silence as his only response. His plans for Rin were his business. If he could keep Rin by his side along with obtaining a suitable vessel, it would make claiming Assiah an easy task. But Rin wouldn't be so easily turned against those humans. He'd planted the seeds of doubt, but now they needed to grow.

Iblis, annoyed as she was with the silence, knew better than to press the matter.

Their conversation was brought to a halt by an explosion down below and Amaimon flying into the opposing wall. There was a huge dust cloud where the explosion came from and a blue hue radiating from within.

Rin pushed himself up off the floor, wiping the blood from his jaw. Amaimon didn't give him any more time to recover before slamming into him again and again.

"Hm, I was hoping for more of a fight. Everyone seemed so obsessed with you, even older brother was annoyed you had been taken. But I don't understand why; you're so weak."

He continued his barrage of attacks on Rin who was currently pinned to the floor with Amaimon straddled over his waist. All he could do was raise his arms to block what he could of Amaimon's attacks. His vision was blurred but he could still make out the figures of Satan and Iblis in the stands overlooking the arena. Did Satan change his mind, and want him dead? Or was this really just part of his so-called demon training?

Amaimon was relentless, and Rin was ready to just give up and let him end it there and then. He had no home, no family and no place in either Assiah or Gehenna it seemed. Too demon to be a human and too human to be a demon.

Voices were screaming in his head, all the times he'd been called a demon flooding back to him. All the times he was reprimanded for fighting back and made to feel like it was wrong. Like he was wrong. But really, he was just being what he was born to be; a Demon. He had tried so hard to be human, to be accepted. He pretended not to notice the cold and fearful looks he got from his family when he slipped up, but they haunted him nonetheless.

He was sick of being knocked down. He wanted to be free. He wanted to burn.

All of a sudden, his flames exploded out of him knocking Amaimon across the room to the opposing wall. The explosion sent up a dust cloud from the sandy floor.

Satan arose from his seat to get a better look. Iblis joined him on the edge of the balcony.

The dust started to clear and stood in the centre, in a pillar of violent blue flames, was Rin. Satan gave a menacing grin.

Rin stood there for a moment looking at his hands, long black claws now graced his fingers. He raised his head and looked over to Amaimon in the distance standing up from where he'd been thrown. A deep guttural growl radiated from his throat as he moved towards him, flames growing even higher.

"Burn…" Rin's voice was low and gravelly, almost monstrous.

His walk turned to a run and he pounced on top of Amaimon engulfing them both in blue flames as he clawed away at him.

"He's finally thinking like a demon." Iblis stated. Satan completely ignoring her in favour of watching his son rip into Amaimon. The glee was practically emanating from his face.

After a while, it was apparent Rin was going for the kill and was not letting up. Amaimon was starting to deteriorate under the intenseness of Rin's flames. His screams soon filling the arena.

"Father, we should stop him before Amaimon's vessel is destroyed."

"Very well. I have seen enough for now." Satan sounded almost disappointed at having to stop the fight. Seeing the amount of power radiating from Rin so early was pleasing. But he wasn't going to risk Amaimon's vessel, he was still useful to him in Assiah. Even if just to keep an eye on Samael.

He descended down to the arena himself, Rin wasn't going to let up easily not if he thought someone was weak. Iblis had jumped down ahead to pry Rin away from Amaimon and was fending him off herself. Luckily, she was still the stronger demon, despite his blue flames. He was fighting like a wild demon, blinded by his rage. She managed to floor him long enough to get a grip on his tail again. He squirmed under her but stayed relatively still so as not to cause himself more pain.

Satan approached and stood at his head.

"Rin, enough!" His voice was a warning in itself. But Satan's presence alone was enough to stop Rin. Even in his current state, he recognised Satan's authority and power. Rin looked up at Satan, his expression was a mix of rage and pleading.

"Want—" Rin started, his conscious seemed split in two and both were fighting for superiority. "Want to burn…" His hands rolled up into fists, claws stabbing into his palms. Blood pooling onto the sand below.

"What do you want to burn, Rin?" Satan crouched down to meet Rin's gaze.

There was a pause before the low gravelly voice came back "Everything…".

Satan smiled darkly and held his hand out to Rin.

I hit writers block in May. This chapter was hard as I've not wrote fights before. But here we have Iblis and Amaimon enter the scene. There was going to be more and I'm annoyed I just missed my 4k word quota I was aiming for but it seemed like a fun place to stop (At least it didn't take me 4 months...).