I don't own Yu Yu Hakusho. The characters Nero and Cheren are mine, even if the names are not. This is a sequel to Demonic Aggression. If you have not read it, I suggest you do so before reading this.

Chapter One- Powers and Abilities

Yukina closed her eyes, inhaled, and then slowly let it out. "Yes," Kurama said gently. "Relax. You will not let your aggressive nature control you. You are stronger than it. Let your ice apparition side aid you in your control."

"Kurama," she said. "Suppose I am not an ice apparition anymore? What if I am all fox now?"

Kurama lapsed into silence as Yukina opened her eyes. It had been two days since Yukina had lost control of her powers and had gone into an overwhelming rage of anger. If it hadn't been for Hiei, the compound, the forest, and everyone living there would have been iced and burned. It was now Sunday and Kurama and Hiei were there to teach control and the use of her fire powers.

Kurama regarded Yukina. She had the ears, tail, and claws of a fox which showed signs of her dual powers. Her ears were a darker shade than her hair but the tips were dark red. Streaks of red ran through her hair and tail and she had long sharp claws. Her height and eyes hadn't changed, the latter showing curiosity at what Kurama's answer would be.

"There is a simple way to find out," Hiei spoke up. He looked at Yukina. "Cry."

She blinked before saying, "Yes, of course." She promptly thought of her fiancée, Kuwabara, being killed in some horrific way and a tear welled up. It spilled from her eye, slid down her cheek, and fell to the floor, a wet spot marking where it had landed.

All three stared at it before Kurama said, "It appears your supposition was correct, Yukina. You are all fox demon."

"But still my sister," Hiei said, anticipating her next question.

She nodded at this. It didn't matter what she was now. Hiei and she had been born by the same woman and at the same time. They were twins and siblings, a fact she hadn't known until two days ago. His revelation had served to calm her and dissipate her powers and energy that had been raging out of control. Hiei had admitted to wanting to tell her that very day and told her this after she had practiced her illusion ability which hadn't taken long, as Kurama had anticipated.

Hiei moved to kneel before Yukina and held out his hands, palms up. "Let's work on making a barrier."

"But, I learned to do that during the Dark Tournament finals. Well, Puu did, but Botan and I kept it going when Genkai possessed Puu to talk to Toguro."

"Yes, but you need to make one yourself. You will need a barrier to protect yourself or others. I sensed that your powers could rival my own when I approached you the other day."

The idea of protecting Kuwabara sounded wonderful to her and she put her hands in Hiei's. A gentle warmth washed over her hands and she sensed her fire powers coming to the surface.

"I learned a lot about fire since the Dark Tournament," he said in a calm voice. "It is an element that is best used when calm or in control of your anger. Lose control of that emotion and the fire can blaze and burn those around you. A barrier of fire energy would be best. A transparent shield with the edges a light red color. Simply imagine the size and strength you want and will it to appear." Hiei saw Yukina's eyes flare red for a moment and heard a small gasp from Kurama. He looked over at him and saw that a domed shield had encompassed him and Yukina. It looked exactly as Hiei had just described. He put a hand to it and felt a solid, warm surface. "Very nice, Yukina. You definitely have control."

Yukina giggled as the shield dissolved. "You're my brother, Hiei. You are calm and controlled even when in the midst of battle."

"Yes and as siblings, we share the same level of control."

"I did cut off my emotions while I was held captive for all those years." She looked down at her hands which now rested in her lap. "I only wish I had done the same while I was changing."

"The urges of a fox demon are strong and overwhelming for young foxes," Kurama said. "I had felt that when I was young. It usually hits around thirteen and one must seek guidance in controlling one's aggression and urges."

"So, nothing could have prepared me until now?"

"Correct." He then sniffed a little. "Hmm. That scent," he said, sounding a little excited and worried.

"What scent?" she asked.

"It is faint but will grow stronger within a day or two. It is the scent of a fox ready to take a mate."

"What!?" Hiei exclaimed. He stood and loomed over Kurama who was seated. "Don't you dare touch her, Fox."

"Threats are not necessary. I also smell that she is unavailable. I will not touch her though I do find the scent enticing. Yukina, you may find yourself aggressively propositioning Kuwabara. The desire to have a mate is intense. You will not feel the urge to have little ones; that is a different urge altogether."

"But, Kazuma is already my fiancée."

"Yes, but the urge will not acknowledge that though it will recognize Kuwabara as someone you love."

"Is there a way to control any of it?"

"Oh, yes. Since you love Kuwabara, some control has already been exerted. If you were unattached, you would have already tried to entice me."

She smiled at this and then, "Will I want to actually mate not long after I have a mate?"

"The mating will not occur until both feel ready to have a family."

"I'm not ready and I know Kazuma is really not ready."

Kurama chuckled and Hiei scowled as he sat. Kurama knew Hiei didn't like Kuwabara being engaged to Yukina but knew he couldn't keep them apart. "Yukina, there's one more thing I would like to teach you and then Hiei and I will leave you to rest and practice."

"What is it?"

"You can take the form of an actual fox though an unusual one due to your colors."

Yukina's eyes lit up at this revelation. "A real fox?"

"One that can talk and make fox sounds. Your senses will be a little sharper in that form but not terribly so."

Yukina didn't ask how to do it as she suspected that focus and concentration were required just like when using her powers. She willed herself to become a fox and sensed that she had gotten smaller. She opened her eyes and then crossed them to see a fox's snout in front of her. She yipped in a laughing fashion before actually laughing. "I did it," she said.

Kurama smiled at her success but was also in awe at her form. She was the size of an adult vixen with aqua-colored fur. The tips of her ears were dark red, of course and her tail was the same too. Her body was another story. She had a red streak that ran the length of her spine and there was a horizontal red streak on both sides of her body.

Hiei reached out and ran his hand down her back. "Soft," he said as he stroked her head and sides. "You are a very unusual fox, but I like it."

"I'm sure Kazuma will like it too when he comes later on and I show it to him." Yukina sighed as her brother stroked her some more.