I don't own Yu Yu Hakusho. Only the characters of Colaban and (later) Hina are mine. This story is rated MA for its content as I stated in the summary. So, if you are under twenty-one, I would suggest you hit the back button now.

Chapter One- Secret Mission

Hiei took in the picture of the demon on Koenma's view screen. He was very good-looking with his tanned skin, dark eyes, and rich brown hair. He could easily pass for human…except for the two black horns on his head, but even the horns added to his looks. "So," he said. "He's wanted for murder and rape?"

"Murder mostly, but he has engaged in slave trade and rape. He's been most clever in evading capture and has built himself quite a business. Arresting him will not be easy, even for Yusuke."

"If Yusuke is the one to arrest him, then why did you send for me?"

"Colaban will be on the lookout for Spirit World operatives, so Yusuke will need a disguise. I was hoping to borrow your blood for that purpose."

Hiei's eyes narrowed. "You know I'm part fire demon and part ice apparition. You'll have to choose one to use."

"You're quite correct. I have already chosen the ice apparition side and I have a way to activate that side since it's dormant in you.

"I also have a request, Hiei. The place Colaban frequents is a club where only pairs can get in. Will you accompany Yusuke into the club? You can claim to be siblings and serve as Yusuke's backup."

"Hn, fine. Give me two syringes and allow me to use them on the detective."

Yusuke walked into Koenma's office, the doors sliding shut behind him. "Okay, Koenma. What's this mission about?"

"Well, it's dangerous for one thing." Koenma pushed a button and the view screen came on and Colaban's picture appeared. Here's your criminal. His name's Colaban. He has built up an impressive business, but he's committed slave trade, rape, and murder. It's the latter two that he's wanted for; the only thing is that he's been clever not to get captured. However, we have tracked him to a club in Demon World. You, Yusuke, have to arrest him and in order for you to do that, you need a disguise."

"What, you want me to put on some lame costume?" Yusuke scoffed. "There's no way in hell that would work."

"Not a costume. You're going in a better disguise…as a demon."

At that moment, Hiei approached with an empty syringe in one hand and a filled one in the other. Yusuke backed up to the door, but it refused to open as Koenma had locked them the moment after Yusuke entered. Yusuke backed away from the syringe-wielding fire demon. He looked at the prince who was sitting at his desk. "Hey, Koenma! You can't be serious!"

"Yusuke, relax. Colaban would attack you or successfully escape the moment he sees you. But, if you're in disguise, you'll be able to arrest him. Hiei offered to donate his blood for the disguise."

"You said nothing about this type of disguise!"

"Hn. Deal with it, Detective," Hiei said. He stabbed an empty syringe into Yusuke's arm to withdraw a blood sample before injecting the other syringe. Yusuke felt like his blood was on fire and he also felt dizzy. He sank to his knees before passing out.

Yusuke's first thought upon regaining consciousness was, I'm gonna kill Hiei and maybe Koenma too. He sat up and looked down to push up off the floor. He froze when he saw a pair of breasts on his chest. She screamed in horror. She jumped to her feet and glared at the prince and the demon.

"All right. Explain," she demanded.

"It's simple. It'll be very easy to get near the suspect as a female demon. As you know, Hiei has fire demon and ice apparition blood. I simply triggered the ice half in the blood sample. It's this part that also changes the gender."

Yusuke looked at Hiei. "But you don't change to a girl."

"My fire demon blood is stronger and I was born male. The ability to become a female ice apparition is dormant in me."

"So, I'm an ice apparition? Like Yukina?"

"Yes. You're an ice apparition with all the abilities included," Koenma said. "Now, ahem, I suggest putting on some different clothes before heading after the suspect. Botan's waiting outside to help you."

"So Botan was in on this?"

"Of course she is. She's your assistant, after all."

"Oh, Yusuke, you look adorable!"

Yusuke eyed her reflection warily. Her hair had grown to mid-back, still black but with a white starburst like Hiei's. Her eyes were wide and a soft red and her face was delicate-looking and quite feminine. Her body was slender and was cloaked in a deep green kimono. She even wore socks and shoes like she had seen Yukina wear.

"Botan, I'm really a guy and guys are not adorable."

"Well right now you're a girl and trust me, girls describe guys as adorable. You know, you really could pass for Hiei's twin sister, except you're taller."

"Yeah…I kind of noticed that."

"That's good, actually. See, Koenma wants to send Hiei in as backup and if you both enter the hideout together, the two of you can say you're twins."

"Huh?"

"Oh, dear. Koenma didn't tell you? The hideout is a club where only couples can get in and they don't have to be girlfriend and boyfriend."

"So, that's why I'm a girl."

"Partly. The other reason is the get close to the demon you're arresting. After the mission's complete, Koenma will use your blood sample to change you back."

"I don't know about this," Yusuke muttered to Hiei as they lined up to enter the club in Demon World about two hours later. She looked around uneasily causing some of her now tied-back hair to fall over her shoulder. She pushed it back, feeling annoyed with it. She was still mad about being forcibly changed into a girl and she would make it clear that she would not do another mission like this again; Botan could do it since she was already a girl.

"Hn," Hiei grunted as they approached the front doors. A pair of tall horned demons flanked the double doors and the one next to Yusuke leered at her in a way that made her skin crawl.

"Hey, beautiful. How about ditching your boyfriend and go somewhere private with me?"

"Before Yusuke could snap out a response, Hiei sprinted up to the demon, the tip of his katana against his throat. "I suggest you leave my sister alone," he said in a low, dangerous voice.

The demon gulped and nodded slightly. Hiei glanced back at the other who promptly faced forward. He sheathed his sword, took Yusuke's arm, and steered her inside. "Come on, Hina," he said as they entered.

"Hina?" Yusuke asked skeptically.

"You needed an alias. Hina was my mother's name, so respect it."

Yusuke nodded. She knew how Hiei was when it came to family and how important it was to him, even though he kept his feelings well hidden. After all, he cared greatly about Yukina but you wouldn't know that, looking at him and the way he interacts with his sister.

The place was dimly lit, loud, and crowded. It looked like a normal club back on Human World to Yusuke, except the customers and employees were demons. There were demons dancing, drinking, or having conversations.

Hiei zipped off into the crowd while Yusuke sat at the bar, her back to the bartender. Hiei was making himself scarce since he was merely backup and a way for Yusuke to get inside. Her job was to find the suspect and get close enough to arrest him. She knew she would have to lure him outside to arrest him and that meant turning on the charm and trying not to gag at her actions.

She gazed around the dance floor and along the walls before glancing up and down the bar and spotting him. He was at the end of the bar, entertaining a pair of girls with what were no doubt stories of his crimes. He wasn't ugly; on the contrary he was exceedingly good-looking for a demon and Yusuke was sure he was a smooth talker if he was able to engage in slave trade, rape, and murder. It was the last two crimes that put him on Yusuke's case list.

Her suspect, Colaban, looked over at her as if sensing her eyes on him. He spoke to his companions before wending his way to Yusuke. He sat on an unoccupied stool and flashed a charming smile, for a demon. She gave a shy smile before dipping her head.

"No need to be shy, my dear. My name's Colaban. And you are?"

"Hina," Yusuke replied softly.

"Hina." He looked her up and down in a way that was the opposite of the bouncer demon. "You're an ice apparition. I heard your kind don't leave their ice world."

"True, but there are a small number of us who do. I left to find my twin brother and learn about the world by traveling with him."

"You don't say? Is your brother here?"

"He's in here somewhere. We got separated in the crowd." Yusuke was proud of her acting. She remembered everything she had learned about Yukina, seeing as she needed to pass for Hiei's sister.

But, she wanted to get this mission over already. The sooner she could go back to being a guy, the better. She slid off her stool, shot Colaban a flirty yet furtive look, and tilted her back to the exit. He gave her an equally flirty look and nodded before getting up and following her to the exit.

Hiei watched Yusuke from his spot against the wall. She had caught Colaban's eye and he came over to engage in conversation. Too easy, he thought. Yusuke doesn't seem to realize how…attractive she is right now. Not that I'm attracted since I know that's not her real appearance or gender for that matter. He saw Yusuke slide off her stool and head for the back exit with Colaban right behind her. Ah, the arrest will soon take place. I'll give it five minutes before I go out there myself.

Yusuke kept a look of disgust off her face as Colaban ran a hand through her hair. Instead, she arranged her face into an expression of contentment. She heard him murmur, "So soft." She knew he referred to her hair. She had to admit that she was an attractive girl and it was those looks that caught Colaban's attention. Maybe I should be considered for more missions like this, now that I think about it. I'm starting to like looking like a female version of Hiei. Perhaps I just needed to get comfortable being a girl. Her thoughts were such that she actually closed her eyes as Colaban initiated a kiss.

Suddenly, a gag was tied over her mouth and she felt her ankles and hands being bounded. She opened her eyes in time to see Colaban grab her and sling her over his shoulder before heading for open space. Yusuke screamed behind her gag and pounded on his back with her bound fists, but he ignored her protests. Indeed, he chuckled as he walked.

"I apologize for the rough treatment, Hina, but I find you attractive and I decided that I want you for myself. I know other things about your kind than I let on. I know your tears form rare, beautiful jewels. I plan for you to produce those jewels so that I can sell them for a lot of money. I also want you for your body. Oh, I can't wait to explore it." He laughed in delight and Yusuke felt a sick feeling in her stomach.

I'm going to end up like Yukina; a prisoner. He'll force me to cry and he plans to rape me! Wait, I'm not an ice apparition, I just look like one so I can't make Hiruseki stones. I hope Hiei realizes something is wrong and backs me up or gets the rest of the team.