Author's note:

Greetings!

This is a HieixOC story and the first time I've ever written anything other than one-shots so it makes me a bit nervous because I'm not sure if you people will like it... but I'll try my best and give it my all! I want my readers to get only the best!^^

My OC is actually me in this story so what she does in every kinds of situation is everything that I'll do. I think I've done quite well for a prologue but in the end, the judging are yours to do. I hope to hear your comments about my stories in reviews. If I make a lot of grammatical mistakes, please forgive me because English is not my first language. And please don't flame me! That's like stabbing my already low confidence with dull knife!

Well, I'll stop my babbling and let you read now. Please enjoy~

Disclaimer: I do not own Yu Yu Hakusho.

A Key to His Heart

Prologue

The airport was, as usual, bustling with activities. There were people all around, creating one huge crowd where loud cries and laughter were heard.

One lone female manoeuvred herself with skill through the highly populated area, dragging her red suitcase behind her while holding onto her handbag with one hand, the click-clacking echoes of her heels muffled by the voices around her.

Two brown eyes scanned over the crowd, searching for one familiar form, one with similar features as her. People were squeezing around and waving, shouting out names. It didn't help that most of the people around her were so tall, they hindered her view.

A loud ringing from her bag got her attention and she took her phone out, pressing a button and holding it next to her ear. A female voice sounded from the other side of the phone, "Nee-san?"

"Yes, it's me."

"Where are you? It's really hard to find you with all these people around."

"True. Why don't we just meet outside?"

"Oh. Okay." And the line went dead. She put her phone back into her bag and ran her finger through her long black hair, sighing and looking around for the exit. It's been some time since she'd been in Japan's airport and she had actually forgotten the layout of the place.

Turning to the woman standing beside her, she smiled and asked, "Excuse me. Do you know where the exit is?"

The woman nodded and pointed her finger forward. "Just go straight and turn right."

She bowed. "Thank you." And after flashing one more smile, she made her way to the exit.

The exit wasn't actually that far and if she had walked a few more steps forward, she'd have found it on her own. Smoothing her ankle-length cream pencil skirt from any wrinkles, she stepped through the automatically opened door. Even outside, there were so many people.

Looking around, she looked for a blob of brown hair. There were several but they weren't the ones she was searching for. Preparing to make a call, she opened her bag and took her phone out.

Being so focused on her phone, she didn't notice the two people, one male and one female, making their merry ways toward her.

"Nee-san!" arms went around her neck and she jumped in surprise. Turning her head to the side, she could see a mass of brown hair which obviously belonged to a woman.

"Keiko?"

The brunette raised her head and flashed a warm, welcoming smile.

"Kyoko nee-san, I miss you so much!"

Kyoko laughed and turned around in her little sister's arms to hug her back. "I'm home?" she teased, patting her back gently.

"Welcome back." They smiled at each other.

Their sisterly moment were interrupted by a loud awkward coughing coming from their sides and both turned in the same time to see the infamous Urameshi Yusuke standing there with a grin, a hand in his pocket while the other was holding onto Kyoko's forgotten suitcase.

"Where's my hug?" he joked in whiny voice and opened his arms wide. Kyoko laughed and gave him a tight hug. "It's good to see you Kyo-nee."

"Of course." She patted his back a few times. "You're unusually pleasant today."

"Are you implying that I usually don't?"

Kyoko raised an eyebrow. "Well… how to say this…" she detached herself from him. "You are usually cursing in every single sentence and you act kind of reckless and idiotic. And you are so rough and harsh and ruthless. You also burn my homework once."

"I'm only five then! You shouldn't hold a grudge against a kid's prank!" he huffed. "Sides, I'm only doing a favour by freeing you from those… those…" he shivered, remembering Kyoko's stacks of homework that were probably taller than . he had no idea how anyone could put up with those nightmares known as homework. He clasped a hand in front of his mouth. "I'm gonna puke."

"Oh, man up!" Keiko smacked him on the back of his head. Kyoko chuckled.

"I'm only joking Yusuke. Now, who wouldn't love your weird sense of humour?"

In a blink of an eye, Yusuke straightened up with a smug grin. "I know, right?"

"So, how have you been treating Keiko?" asked Kyoko pleasantly.

Keiko crossed her arms and glared at Yusuke. "If by treating me well you mean ditching me on a date, then yes, he has been treating me very well."

Yusuke shuddered at her cold voice and glare. He sweat-dropped. "I told you I overslept! And I've already apologised for it countless times!"

"If you hadn't spent the night drinking sake and watching that stupid football then I won't be this angry!" she raised her hand and slapped him on the back of his head. "Stupid Yusuke! You just never change!"

Kyoko laughed. "You two are always so funny!"

"Kyo-nee!" Yusuke whined "Aren't you on my side on this?"

"Nope. I'm neutral."

Keiko huffed and raised her nose in the air snottily, turning her head away from Yusuke. Yusuke's shoulders shagged and he went away, mumbling something about evil women ganging up on him and getting his car, dragging her suitcase with him. Once Yusuke was out of sight, Kyoko gave her full attention to Keiko and raised an eyebrow.

"You want me to talk to him?"

"No." Keiko shook her head, her now long brunette hair moving with her. "Just let him. If he actually changes then he won't be Yusuke anymore." She grinned. "That boy will never grow up."

"Really Keiko? Boy? He's twenty now."

"Well, he acts like one."

"I can't deny that." Chuckling, Kyoko asked her little sister about her life which Keiko answered enthusiastically. They talked about their parents, their family business, Keiko's education, Yusuke…

"So, where's the ring?"

Keiko blush a little and showed her left hand where a beautiful white gold band adored her ring finger. The ring's diamond twinkled prettily under the lights.

"It's a pretty engagement ring." Kyoko nodded, inspecting the ring "Yusuke has a very nice taste."

"As if. I was the one who chose it. Yusuke's completely clueless about this stuff! It even takes him this long to propose!"

Keiko began her common ranting about her fiancé. Kyoko was used to Keiko's rants by now. Keiko always ranted in her letters or emails. Usually she would talk about her college life and their parents but mostly Yusuke.

The loud honk of a car managed to stop Keiko's ranting and she led her sister to the car. Kyoko sat in the back-seat and Yusuke waited for Keiko to finish buckling the safety belt before speeding away. The ride was enjoyable with their chattering and laughter.

'It's good to be home', she thought with a fond smile.

Once they arrived at the Yukimura's residence, the two sisters left Yusuke to take care of Kyoko's things. It's not like there were many things, only one suitcase filled with clothes and shoes, nothing Yusuke couldn't carry but he decided to be a brat and whined anyway.

The restaurant was closed today so it was empty inside. They made their way upstairs to the living room and instantly a big smile erupted upon Kyoko's face. She removed her heels and slipped her feet into the slippers.

"It's been so long." She sighed dreamily. "Nothing changes."

"Except the carpet. It's yellow now." A gentle voice drifted from the kitchen. Both sisters' heads turned to the plump woman standing in the doorway with a grin and twinkling eyes. Kyoko immediately ran forward and embraced her tightly.

"Mom. I miss you."

Mrs. Yukimura laughed loudly as she wrapped her arms around her daughter.

"How are you dear?"

"Fine. Better now that I've seen you mom."

"Ah, ever the sweet-talker." Mrs. Yukimura laughed once again. "Just like her father when he was still young!"

As if on cue, Mr. Yukimura stepped out of the bedroom he shared with his wife. He was out of his chef's gear and at the sight of his eldest daughter, he broke out into a gleeful grin and opened his arms wide for a hug. Kyoko hugged him.

"Nice seeing you again dad."

"Same here, same here."

Unfortunately, the happy family reunion was ruined when Yusuke burst from the stairway, carrying Kyoko's suitcase easily with one hand. He looked around. "Did I interrupt something?"

Keiko rolled her eyes. "You always do. Idiot."

"Hey!"

"Keiko, you should be kinder to little Yusuke." Mrs. Yukimura scolded and with a victorious puff of his chest, Yusuke dashed to stand behind her, sticking his tongue out childishly at Keiko. The brunette's face darkened and she sent Yusuke a death glare.

"Nah! Keiko's doing the right thing!" her father chided in "Besides, Yusuke can take a little beating!"

Keiko looked at Yusuke smugly.

Kyoko chuckled. "Don't worry mom. That's just their way of bonding."

Mrs. Yukimura rolled her eyes before kissing he daughter on the top her head and murmured, "It's nice to have you back, dear," before going back to the kitchen. Mr. Yukimura shrugged and gave his daughter one more hug before going back to his room.

Now, with no one to protect him from Keiko, Yusuke hid behind the couch from Keiko's glare of doom. The brunette rolled her eyes. "Coward. Come on nee-san, let's go and get you settled in."

The sisters made a move to leave when they noticed Yusuke following them. "Yusuke, you're not allowed. It's a girl's room." Keiko reprimanded.

"But I've been to your room before!"

"Don't care. Now go away! Shoo!" she shoved Yusuke back to the living room harshly, causing him to lost his balance and stumble to the carpeted floor.

"I don't really mind." Kyoko interjected but Keiko shook her head and led her to her bedroom.

Opening the door, Kyoko scanned her old bedroom fondly. Nothing changed and everything was still in place. The only thing different was probably her bed sheets and other than that, nothing changed. Even the scattered music compositions on her desk were still there.

She went to the room and touched the upright piano pushed against her wall in front of her bed. It was clean and the wood was nicely polished. She was happy to know that her beloved piano was taken care of.

Keiko pushed her suitcase into her room before she left, giving her some alone time to readjust to her room. Her eyes scanned over her bookshelf where her novels and music magazines were rowed neatly. The dresser beside her bed still had the night lamp she had from her childhood.

She walked toward her desk and opened the curtain which was right in front of her desk. There wasn't really anything to see as the outside of her window was blocked by a large tree that Keiko had told her once in her letter. Apparently, Keiko sent Yusuke out to buy some flower seeds to decorate their little garden yet he bought a tree seed instead.

She didn't mind really. She didn't really like the sunlight. She loved the rain too because it cleansed the polluted air and helped the growing of plants. She was also fond of the smell of wet earth and the pitter-pattering sound of rain hitting the ground.

Kyoko sat down on her bed, ignoring her suitcase and lay down on her bed. She missed her bed.

She was tired after twelve hours of flight and wanted nothing more than to just slip into her blanket and sleep. She wished she had slept on the plane earlier.

She vaguely heard Keiko telling Yusuke to prepare for the welcoming party she planned. Keiko was so stubborn. She had told her not to bother herself with a party.

But she couldn't find herself to care at that moment because she was already, slowly but steadily, falling into deep slumber.

Makai's sky was a darker shade of orange than it usually was and it signed the incoming of a storm. A storm in Makai was never fun with the harsh howling wind and freezing temperature. Not to mention the lightning that was followed with rough thunder.

Hiei sighed with his back comfortably leaned against the bark of the highest tree he could find. If a storm was coming, that meant he needed to come back to the HQ. He didn't mind the fact that it was a bug but what made him hesitant to go back was probably his boss, who had been bothering him with her approaches lately.

Mukuro had announced that it's time for Hiei to finally take her place as the Lord of Alaric and he accepted gladly. But there's one problem.

Hiei needed a mate before he could be the king.

He told Mukuro to wait as he searched for one but she was being incredibly impatient. He knew what she really wanted. He knew what she felt for him. But he just didn't see her as anything close to a potential-mate, let alone a mate.

His feelings for Mukuro were purely platonic and he saw her as a close friend who shared his pain and his boss. Besides, he knew what Mukuro felt for him wasn't the same feelings that kept Keiko waiting for Yusuke or the feelings that the Oaf, Kuwabara, had for Yukina. She was just overwhelmed by the fact that someone understood her pain and merely became too attached and obsessed.

With her pride, Mukuro would never tell him what she wanted in his face. That's good because he wouldn't need to voice his rejection. He wished she would get the hint whenever he told her that she needed to wait for him to find his mate – the right one.

A noisy rumbling from the sky broke through the silence and he wrinkled in distaste at the smell of rain. He hated water and anything that went along with it. He made a move to leave when a familiar voice called out to him.

"Hiei!"

He sensed the energy that he was sure was hidden until now and looked down. Kurama stood below, with his long hair tied back and a smile on his face.

He raised an eyebrow at him. "Fox?"

"Long time no see." The red-head waved his hand in a friendly way. "Do you mind coming down here?"

Hiei gave a grunt and leisurely jumped down from the tree. Instead of looking up, he lowered his head to meet Kurama's eyes. Over the years, he had grown taller and now he stood a head taller than Kurama – who had also grew a few inches taller. "How have you been doing Hiei?"

Hiei ignored the pleasantries and instead asked, "What are you doing in Makai?"

"To pay you a visit, of course. I went to the HQ and was told that you're not around so I went to the place that I am sure you'll be. It's just my luck that the HQ was parked near the Forest of Fools." He grunted as a response. "How are things with Mukuro?"

Kurama was the only one he told about Mukuro's advances and the fox had given him several assistances in wriggling out of Mukuro's blunt approaches.

He shrugged his shoulders and Kurama understood. He nodded and they walked in silence once again. It was several minutes later that Kurama asked a question which surprised him a bit.

"What do you think of visiting Ningenkai, Hiei?"

His crimson eyes flickered to his, dare he say it, best friend. "What for?"

"Well, since a storm is coming, which means you have to go back to Mukuro, I'm sure you'd rather spar with Yusuke." The fox smiled fondly, reminiscing the past when they would gather in Ningenkai and had a males bonding time a.k.a sparring and drinking.

Hiei smirked, remembering the one time he managed to defeat Yusuke. The ex-detective was out-of-shape for his lack of training and was drunk. It took him less than an hour to beat him.

"And there's a party going tonight at Keiko's."

Hiei furrowed his eyebrows. "What's the purpose of that?"

"Apparently Keiko's sister comes back from London today and she wants to introduce her to us. From the stories I have heard, she is quite a lovely woman." Kurama wriggled his eyebrows suggestively.

Hiei glared though he knew Kurama was merely kidding. "You know humans are not my taste."

"Yes but why not give it a chance Hiei?" Kurama asked calmly, not bothered by his glare. "It's not like I'm asking you to mate with her or anything. Just come and introduce yourself civilly to her. Yusuke and Keiko, along with Yukina, wish for your presence."

His jaw tightened at the mention of his sister.

"She is actually the one who asked me to come and invite you."

With that, Hiei's decision was sold. He would never be able to refuse Yukina.

"So? What's your answer Hiei?" Kurama asked, though he obviously knew his answer. Damn fox and his twisted sadistic way.

"I'll go."

To be continued...

So, how's that? I hope I don't disappoint you or anything... Oh, and here's a little bit of introduction for Kyoko:

Name: Yukimura Kyoko

Birthday : 11 June

Age : 22

Hair : Black

Skin : A healthy pale

Eyes : Chocolate brown

Height : 168cm

Weight : 47kg

Like(s) : Music, piano, animals, Snowdrop flower, green tea, books and her family

Favourite composer : Chopin

And that's it! I hope it'll make it easier to imagine what Kyoko looks like. I'm drawing her right now and will post several drawings of her soon. I hope you'll like them!

Anyway, everything above is complete fiction. Kyoko might be me in this story, but that didn't mean that she has to look like me right?

Please leave me some love! and see you in the next chapter~!