A.N Thank you goddess bubbles for the review you're awesome.

Kuro stopped mid run and sat down panting. 'Rin can we stop? I'm getting tired'

'That makes one of us Rin' thought.

"Okay Kuro go take a long cat nap, thanks for playing" Rin said smiling at Kuro.

Rin's tail twitched as he watched Kuro retreat. He was almost there, almost to the point where he could be released form this energy. If he could just have one more round of fight, one more round of play then he would be able to rest.

He had an idea, hoping it would work.

Rin peeked his head around the door to their bedroom. The slightest movements were made by his brother as he diligently worked. He quietly made his way to stand behind him and wrapped his arms around Yukio giving him a hug.

Yukio became ridged surprised by the sudden contact but then relaxed into the hug.

"What do you want Rin" He said trying to suppress a grin

Rin could hear it in his voice. Yukio was good at hiding his emotions but Rin was good at reading them.

"What makes you think I want something" Rin said innocently. "Maybe I just want to hug my dear little brother"

Yukio felt something radiate off his older brother. There was a strange essence that enveloped him. He became concerned 'was there something wrong with Rin?' This hadn't happened before when they hugged.

"Rin….are you doing okay?"

"I'm doing fine Yukio…just…"

Rin let go of his brother.

"I tired out Kuro and now I have no one to practice my powers with. Could you take his place just for one round Yukio?"

He had planned on being annoying to his brother, bothering him till he would play but when they had hugged it had calmed Rin.

Yukio was in thought. Maybe if he played with Rin that strange energy would go away. He looked over at Rin. Rin's tail was twitching in anticipation, his ears slightly twitching along. He looked eager, almost as if it was something he had needed to do.

"Alright Nii-san"

Rin's eyes lit up. He hadn't expected it to be so easy to convince Yukio.

They both stood on the rooftop across from each other. Rin had Kurikara drawn; his body was ablaze with flames, his ears elongated.

"Rin, I'm not sure how to call on my powers"

Rin thought off all the times he hadn't needed Kurikara to call on his powers.

"Think of something that makes you really upset"

Yukio thought of Rin and how he had almost lost him during their big battle with Satan. Blue flames engulfed him and his hears began to lengthen.

"You did it!" Rin cheered.

Blues flames began to light up the sky as they exerted their powers.

Mephisto was afloat in the sky with Amaimon by his side.

"What do you think of our brother's newly awakened powers?"

Amaimon sighed. "He doesn't look like any fun to play with. He's too careful"

"Hmmm" replied Mephisto.

Yukio stopped to catch his breath. 'How had Rin gotten skill' The Rin he knew would have come at him full force but this Rin took caution to where he placed his flames. Anytime the flames had come close to hitting Yukio, the older one made sure it only singed a small part of his clothes, nothing else. Not once had his flames touched Yukio's skin.

Yukio on the other hand, had left small burns along Rin's arms, which had quickly healed. The second time it happened Rin teased him. "Are you trying to make a barbeque out of me?" he chuckled.

Although Rin had been careful with Yukio he had not been careful about their surroundings. A few trees around their dorm had been diminished to ash. He had tried to hit the small string that hung from Yukio's pants but had ended up putting too much force into his flames effectively enlarging them. The flames had ended up being way too large to throw at Yukio so the tree next to him had taken the damage.

It took all Yukio had to keep dodging his brother's flames. Where did all this energy come from? Rin acted like he could go for days dodging and throwing flames.

Yukio tried to evade yet another flame but his movements began to slow. His eyes widened as he realized the flame was going straight for him instead of just lightly passing him like the others. Rin saw this sending another flame out to try and hit the other so it wouldn't touch Yukio. The flame had effectively been knocked away.

Had Rin been predicting his speed and using that as a gauge for the appropriate time to not hit him? There was no way he had thought it out that much.

"Are you getting tired too Yukio?" Rin asked.

Yukio didn't want to admit it but their practicing was wearing him out.

"It's getting late probably best to go back in" Yukio replied leaving Rin's question unanswered.

'Too high strung to even admit when he's tired' Rin thought rolling his eyes.

His energy had calmed down to a bearable amount to where he thought he could end up sleeping. Their activities still hadn't worn him out. All it had done was make him feel less anxious.

Before they went to bed Yukio walked over to hug Rin. He wanted to make sure that strange energy was gone, to make sure nothing strange was going on with his Nii-san.

Rin was surprised when Yukio leaned in for a hug. Yukio usually wasn't the one to engage in affectionate contact. That same energy was still slightly tingling around Rin. This concerned Yukio but he was glad that it had reduced.

"Sleep well Yukio"

"You too Nii-san"

Rin saw Yukio's tail peek out as he retreated. How come his tail only showed when he was about to sleep? Rin was curious but not enough to ask Yukio about it.

Rin stuck his tongue out at it.