Complicated

When Rin first met Satan, he was furious that he practically killed his dad. Rather, he had him commit suicide, which was something that Shiro would never have done before. And now here he was, after chasing down the demon king in the middle of nowhere, where the trees were shivering and the wind was cold. And Satan smiled.

He didn't expect anything other than that; after all, he was Satan. He should have known better than to expect anything good of the creature before him. But he didn't expect for Satan to reply to him so coolly and calmly, like this was the first time they met.

"Um, hi," he said almost shyly, smiling cheekily and waving. "What's up?"

He was a rather tall man with snow white hair and sapphire eyes dressed in rich but modest maroon robes. Many questions burst into Rin's mind, but he found that he couldn't say any of them as Satan reached into his sleeve and pulled out a slice of a carrot, munching on it with his pearl-white fangs peaceably.

Finally Rin settled for dashing up to the demon king and striking him with Kurikara, surprised when his biological father did nothing more than step back. Another slash, and Satan settled for jumping away a fair distance, a look of confused understanding marked on his face. "Um, Rin, I know I'm Satan and all," he said, jumping backwards onto the ground when Rin struck again, this time cutting off the tree's limb, "and that you're training to be an Exorcist, but that doesn't mean you have to kill me."

"You bastard!" shouted the angry adolescent, the blue flames coating his entire body and the blade of Kurikara whole. His tail lashed irritably behind him as he leered at Satan, fifteen feet away, who appeared surprised. Before he said anything else, he ran once more towards the snow-haired man, who resorted to grabbing the sword's blade before it hit him. "You killed my dad!"

"Eh?"

While Satan held Kurikara's blade in one hand and was distracted by Rin's outburst, the latter balled up his fist and punched the taller man's face with enough force that, if he were a normal human, his head would have been knocked right off. There was a moment of silence, before Rin felt a sharp pang shoot up his back and he yowled, jumping back and hissing when that only made it worse. He looked down at his tail and noticed that Satan had gripped it tightly in his hand and was pulling it.

Rin glared up defiantly at Satan, though there was a trace of fear in him. Satan watched him with an expression that screamed confusion, and he released Rin's sword to wipe away the blood that was beginning to fall from his nose. Right afterward, he shoved Rin away from him, releasing his tail as he busied himself with his pretty little face.

Which he didn't seem to care much for in the first place, paying more attention to his confusion than anything else.

"What do you mean? Shiro died several months ago, you do realize?"

"Yeah! Because you killed him!"

At this, Rin pointed Kurikara accusingly at Satan, his eyes narrowed in rage. The only reason he wasn't beating the strongest demon in Gehenna to a pulp was because he wanted to know what made Satan so confused. His ice-blue eyes glanced down at the sword, though not in the wary sense, then back at Rin. "Rin, dear," he said, lowering his hand from his face, "I haven't been to Assiah in almost sixteen years - OHHHHH."

All of a sudden, his expression turned dark, and he slammed his fist into his open palm. "I see what happened there," he said, turning away from Rin and beginning to pace back and forth in a way that made the younger one's head spin. "That little brat - I shoulda known he'd try somethin'... but kill my second-youngest son's foster daddy... oh, no, now that's just not acceptable!"

He reached into his robes once again, but instead of carrots, he removed a mobile phone and opened it, dialed a number, and put it to his pointed ear, standing in place and tapping his foot on the ground impatiently. The only sound breaking the silence was the crackling of Rin's flames as he tightened his grip on the sword.

"Yes, Iblis," he said, his voice suddenly sweet enough that Rin had to force himself not to relax, "can you tell me what the FUCK YOU DID FIVE MONTHS AGO BECAUSE I SWEAR YOUR ASS WILL BE MINE WHEN I RETURN TO GEHENNA YOU LITTLE BRAT."

Despite how nervous Rin felt at the moment, he felt the strongest urge to laugh, both at how much he didn't understand what was going on, and also the surprising mood swing that Satan displayed.