I don't own Kingdom Hearts, but if I did, Sora would totally be all mine...haha. Story is mostly original, but it is inspired by Vampire Knight. I hope that you guys enjoy. Reviews and criticism would be appreciated.

NOTE: The first section of every chapter is usually told from Kairi's POV, whereas the rest is in the third person. "Stained by Sin" is only the working title. Hopefully something better will come to me.

Another NOTE: This chapter, to me, seems really choppy and I don't really like how it turned out at places. But I'm too lazy to do any editing, so you're stuck with this. Hope you still enjoy anyway.

Summery: Sora disappeared from Kairi's life for unknown reasons. Vampires bring them together again, but it also tears them apart. Blood, lust, fear, secrets, friendships, reunions, and promises change their lives.

4. True First Day
~ Hitsuzen~

I felt something sharp break my skin. Fangs….his fangs…meaning that he was a vampire.

It would explain why he had gone away for a year. He didn't want me to see him this way. He didn't want this to happen…but it did. Whether I was his first victim or not, I'm not sure, but I'm a victim nonetheless.

Sora's a vampire. I can't beli—

Ow. That was painful. He's beginning to draw blood. It really hurts, but I shouldn't scream. It would wake everyone up, or draw attention to Sora's room. No one needs to know.

No one needs to know.

"Sora," I whispered, my breath escaping my body, "please stop." I could hear my heartbeat, at first racing, but then slowly fading away. This must've been how it felt like to die.

It doesn't matter what happened to him, I'll be by his side. I won't let anyone hurt him.

Then everything went black.

-----

Kairi… his mind echoed as she clutched his shoulders, her questioning barely audible to him. His mind, heart, and body completely surrendered to this blood lust. This passion cried out from within his heart, ringing throughout his entire body.

He fell to the lowest status of humanity.

Sora grabbed Kairi's shoulders, his arm wound around hers, and pulled her into him, pulling her into his sinful act against his human will.

"Sora!" Kairi shouted, surprise and fear in her voice. "Are you okay?" She looked into his eyes, seeing that they were the color of blood. It couldn't be, she said to herself, he couldn't have fallen prey…

Burying his face in her neck, Sora licked the skin of Kairi's neck, tasting the warmth of her body. Her skin trembled under his touch, as if it was appalled at the creature handling it. This sent tremors of pleasure within his body.

Kairi struggled to break free of his grip, but he was too strong for her. His fingers tightened around her upper arms, as if in protest. She felt something sharp touch her flesh, sliding along as Sora moved his head to rest on her shoulders.

"I-I'm sorry," he told her, his breathing heavy. "I'm sorry, Kairi." It seemed that he regained only enough humanity to utter his apologizes as he let out a labored grunt while he moved toward her neck again.

"Sor—" her words were stopped as she stifled a cry of pain from Sora's bite.

His pure white fangs pierced her skin, causing her to grab the fabric of his shirt to quiet the pain. The faint smell of blood urged him to go deeper. He drove his fangs further into her neck, blood finally freely flowing. Finding what his body lusted for, he drank, her blood trickling down from his lips. As he drank, his heart beat in rhythm with another as the true essence of her humanity flowed into him.

"Sora," Kairi whispered, her voice dying, "please stop."

The beating of that second heart began to slow as Sora continued to drink. His sense of self returned and he realized that he had taken too much blood at one time. If he took anymore…Kairi could lose her life.

He withdrew his fangs and she fell dead in his arms.

"I…I didn't…" he stuttered, hugging her close to his blood-stained cheek. As he sat still, a faint warm breath brushed across his cheek.

"She's alive," he whispered excitedly, wiping at the tears and blood on his cheeks. "I didn't…" He couldn't bring himself to finish the sentence because of the shame he felt brewing inside him. He looked at her neck, observing the deep bit wounds in her neck, a trail of blood sliding down her throat. Getting up, he walked out of the room, carrying her limp body in his arms as he licked the blood of her skin.

-----

Sunlight penetrated through the narrow opening between her blinds, dancing across Kairi's face as she stirred in her sleep.

"Please…stop," she whispered, drawing her fingers around her neck, tossing her head from side-to-side. "Please," her voice became louder and more frantic, "Sora, don't!"

She sat up, her hands holding her neck as her eyes opened wide with fear. Her breathing difficult and heavy, Kairi looked around the familiar surroundings of her room. She glanced across the room, catching her scared expression in the mirror directly across from her. The star-scattered blanket slid off her bed and fell onto the soft carpet as she got up from her bed to walk over to look at her reflection.

"Was it all a dream?" she questioned her likeness. She stared at it, noticing the plain tan bandage that was on the left side of her neck, in the exact spot where Sora had earlier bitten her. Her fingers trembled as she pulled off the bandage and she caught her breath when she saw the deep bite mark on her neck.

The house was silent to this point and Kairi heard the door open downstairs. She opened her bedroom door, wondering who would come over to her home so early in the morning.

"Kairi? Are you awake yet?" It was Riku's voice.

"Yeah," she answered, glancing at the time. She had gotten up much later than she normally would. This would've been the time she met up with Riku at his house. "Give me five minutes and I'll be right down!"

-----

"Why did you stay in bed so late this morning?" Riku questioned, concern deep in his voice. His silver-blue hair swept over his bright blue eyes as he watched Kair's face contort to an undecided expression. "Is it something you can't talk to me about?"

"No, no. It's not about that," Kairi answered quickly, the contents of her school bag rattling as she waved her hands in protest. "I was thinking about something…Anyway, I didn't wake up this morning until just before you came over."

"Why?" he asked, slinging his bad over his shoulder. "Did you not sleep well last night?"

After taking a moment to recall last night's events, Kairi replied, "I don't know. Last night felt like a dream that I couldn't wake up from. And when I did, it felt all too real." Her eyes clouded over with thought.

"What was it about?" he responded, regretting it when he noticed how she wrapped her arms around her waist. He fought the urge to reach out and pull her into his chest in order to comfort her. It seemed to him that the girl walking beside him would fall apart because of the emotions swirling inside of her. "So, ah…" he mumbled, searching for another topic of conversation, "what did you do to your neck?"

"Huh?" she replied, a break in her previous behavior. "What do you mean?"

"That bandage around your neck," he pointed out. "What did you do to your neck?"

Trying to figure out whether last night was a dream or an actual moment in time or not, Kairi kept her eyes directed in front of her, realizing for the first time how far they had traveled. She saw her group of vampire friends, all talking to each other in a hushed murmur.

Sora stood at the far end of the group, away from her. He glanced up for a passing second, his blue eyes drilling into hers, and then he turned the other direction. Kairi noticed the deep sorrow buried in his eyes, a sorrow so deep that she couldn't fathom its origin. But the fact was she had an idea for the reason behind the pain in his eyes…

"Kairi? What's wrong?" asked Riku, his hand resting on her shoulder after a mental debate with himself whether it was a sensible idea or not. His heart had won the battle in with his mind in the end.

"Huh?" Kairi said, shaking her head to tear her eyes away from the expression of solitude on Sora's face. "Oh. My neck," her voice seemed distant and far. "I was running through the woods last night and a branch nicked my neck. Don't worry about it. I'm fine."

Riku noticed how Kairi was strangely watching Sora, her eyes full of concern and confusion. This concern meant she lied to him; that she wasn't okay and something of major importance was weighing down her mind. Now wouldn't be the best time to ask her, he thought to himself. He made a metal note to ask her about it later.

"You guys are actually on time for once," Roxas commented rudely, his back toward the two. "What a surprise."

"Roxas, don't be mean," Naminé scolded, hitting him in the back of the head before turning to Kairi. Her voice changed to an airy tone. "Morning Kairi. Riku."

"Good morning everyone," Kairi answered, her voice bright and cheery, unlike the cloudy gray sky above them. "Let's get going so we could actually get to school on time."

No one gave a verbal response. Demyx didn't even complain about how the light reflecting from the clouds, unusually bright, irritated his skin. Everybody walked to school in complete and uncomfortable silence.

"What's wrong with everyone?" Kairi asked Naminé, her mind numb from the silence. "Why is everyone so quiet this morning?"

Naminé glanced around her, meeting the eyes of each of the other vampires, as if she wanted approval to answer the question. Her eyes turned to Sora, but he turned the other direction before she could meet his eyes. Hesitating for a brief moment to figure out her thoughts, Naminé spoke softly and quickly, her words disappearing into the wind as soon as they left her lips.

"What?" Kairi questioned, straining to catch the fluttering words from the breeze. "I can't hear you."

Taking a deep breath, Naminé repeated her previous statement, only a little louder. "Last night, we smelled blood…human blood."

Feeling her muscles tighten, Kairi forced her body to proceed forward without stopping. She commanded her face to remain blank, afraid of revealing a secret that the group didn't even know about yet. "Oh," she said, her voice void of any emotion, "what happened next?"

"Simple…we wanted to know who's blood it was," she answered, her fist shaking violently at her side. "All of us haven't tasted human blood - or real blood in general - for a long time, so the smell overwhelmed us. But before anyone of us could track down where it came from, it disappeared. We still haven't figured out whose blood it was."

"Cut the vampire talk," Sora interrupted, his harsh voice holding a parallel to the conversation. "We're already at the school gates."

"Time to meet my adoring fans," Demyx announced, following Riku, who took his usual place at the head of the group. Demyx appeared back to his usual airheaded self, a definite contrast to his attitude of the earlier morning.

The others seemed to returned to their usual demeanors. Roxas had on his slightly irritated scowl as he continued through the sea of girls, holding his school books up to one ear in an attempt to block out their fan girl screams. Naminé trailed a half step behind him, her fingers just barely holding onto Roxas' free hand. She smiled like the sunshine, ignoring the disapproving looks and glares behind her.

Only Sora didn't snap out of his morning gloom. His blue eyes were dimly clouded over, downcast as emotions swirled around inside his head. He stared at the ground as he followed Roxas and Naminé.

Kairi stepped in line behind the rest of them, the volume of the crowd nothing to her ears. She watched Sora's movements carefully as they entered the school building.

"Sora," Riku spoke as the doors closed behind him, "do you know where you're going around the school?"

"Yeah," he answered, a small grin playing in his lips, "I'll be fine. I'm gonna head off now, in case if I get lost, I won't be late." He waved goodbye to everyone weakly before turning into the hallway.

"I'll go watch over him," Roxas stated once Sora was out of hearing range. When he took a step forward, he noticed the bandage on Kairi's neck and made a mental note of it.

But he wasn't the only one to notice. Demyx caught the momentary glance in Roxas' eyes and his eyes flickered to Kairi's neck.

"Thanks, Roxas," Kairi said as he finally walked past her.

"Hey Kairi," Demyx announced, draping his arm around her shoulders, "I need to talk to you. Do ya mind?" He paused briefly, but not long enough to allow her time for a response. "Great. C'mon," he pulled her along and Kairi followed without much struggle.

"You better behave, Demyx," Riku shouted after him, his voice bouncing off the smooth walls of the hallway.

"Yeah, yeah," he answered, taking an abrupt turn into another hallway to put himself and Kairi out of Riku's line of vision. After a few steps, Demyx eased his hold on Kairi's shoulders. "I guess Naminé told you about what happened last night."

Her body tensed when she related Naminé's account to her own experience. It was her blood that they smelled last night, her blood that they had all lusted for, her blood that Sora thirsted and craved for.

"So," Demyx said, interrupting her thoughts to a frozen expression on her face, "did Sora tell you how your blood tasted?"

"What are you talking about?" Kairi retaliated, trying not to let much emotion escape the lines of her face.

"Those bite marks on the left side of your neck," he answered, holding the bandage between his two fingers as proof of his victory.

Kairi reached up to touch her neck, caught off guard. "How did you…" she eyed the smug smile on his face. "That doesn't mean that Sora did it. All this," she fingered the deep wounds, "proves that I was bitten by a vampire. It could've been anyone. A Renegade, even."

"I don't think so," Demyx answered, drawing closer to her. "We didn't hear any screaming last night. Considering how deep those are, someone had to have bitten you pretty hard."

"Like I said, anyone."

"Anyone?" he responded in a questioning tone. "Or just Sora?"

Kairi didn't show any sign of reaction, keeping her face as blank as it was possible at the moment. Demyx didn't need to know how right he had been.

"Well," he said after a challenging moment of complete silence, "I'm going to class. I'll see you after school." He started away, but turned around to briefly advise her to cover the bite marks before people began to question her about them.

-----

Closing the metal door of her locker, Kairi hugged her school books close to her chest, taking deep breaths. The nurse nearly caught on when she went to the office to ask for something to cover the wound on her neck. At least now, people wouldn't be able to see his mark on her.

"Sora," she whispered quietly to herself as she walked to her first class, AlgebraIII.

She desperately wanted to learn more about what had recently happened. For how long had he been a vampire? How did it happen? Why didn't he tell her? Did Riku and her father know about this?

"Kairi," Taka-sensei, her first mod math teacher, cleared his throat, "would you care to take a seat so I can begin class?"

"Oh, hai!" she answered, bowing her head apologetically. Fighting the red color coming to her cheeks, Kairi commenced to take a seat toward the exact middle of the room.

Today was the first day she noticed the empty seat beside her. She stared at the empty chair beside her, wondering how long had she been without a neighbor. It had to have been today, or at least recently. There was no way she wouldn't have noticed this earlier.

"Now," Taka-sensei announced in his loud but clear voice, "I'd like to introduce our new addition to the class. Sora, you can come in now."

Kairi's body stiffened at the sound of his name. She honestly had not expected to see him until the end of the day. She didn't want to see him yet, not until she had time to figure out what she was going to say to him.

"Ohayou gozaimasu," he said, his voice a heart-melting melody. "My name is Sora and I'm pleased to be in your class."

A brief paused followed as all the students – male and female alike – except for Kairi held their breath while gazing at the gorgeous boy standing at the front of the room. A couple sighs could be heard as a few girls recognized Sora as the new student from yesterday.

"Sora," Taka-sensei was the one to break the silence, "you can take a seat in the empty desk beside Kairi."

"What? Me?!" she blurted out, now realizing what the purpose of the empty desk was. She felt the jealous glares of the girls behind her hit her back.

"Is there a problem?" he questioned, opening his planner to the day's lesson.

"No, it's just…ah," she replied, scratching the back of her head, "nevermind."

As Sora walked to his seat, he answered everyone's greeting with a smile, but his face turned into a blank expression when he took his seat. He stared ahead at the front of the room, bored as he watched the teacher work out a problem on the board.

Kairi was hardly paying attention to the day's lesson. Her mind was already running in several different directions. The boy sitting beside her was still the same boy she knew from years ago and before last night. But there was something different about him. He seemed more…beautiful. Physically, he wasn't not the same, but he seemed more graceful, more striking, more…like Roxas and the rest of them.

-----

"Kairi?" a voice broke into her thoughts. "Class is over."

"Uh…what?" she shook her head and refocused her attention. Most everyone around her was leaving or packing up. She was too deep in her thoughts and didn't realize how much time had actually passed, that was until someone took the time to tell her. "Oh, thanks," she glanced up to see who it was (she also was too deeply buried to register whose voice pulled her out). "Sora," she added with a surprised smile.

"You're…" a small grin crept onto his lips, which he noticed, and he quickly changed expression, turning his back to her. "…welcome," he finished roughly. He needed to distance himself from her. He needed to protect her life.

Pulling in a nerve-calming breath, Kairi gathered her books and followed him out the door. "What's your next class?"

His blue eyes flickered back to her and a humored smirk arose on his face. There's no way I'm going to be able to avoid her. There's just some kind of attraction other than the one we feel for each other pulling us together. Should I play cold or maintain our friendship? He glanced back again and she was quietly following behind him, her eyes watching for a response. Sora pulled out his schedule and told her. "Chemistry I with Yukito-sensei."

There was a delay to her answer, for the first bell rang. "I have that class next too. Looks like we'll have at least two classes together every day," she responded slowly, afraid that if she said the words too quickly, the meaning would be lost.

The two of them walked in silence the rest of the hallway. Amongst the rushed chatter of the students trying to quickly finish their conversation before the second warning bell rang, Sora and Kairi's footsteps bounced off the linoleum floor, reflecting off the hallway lockers and resounding in their ears. When the second warming bell rang, they picked up their pace, the rhythm of their footsteps marching in a faster synchronized rhythm. Once they reached the door, Kairi stepped inside as Sora waited in the hallway. She turned around and gave him a confused look, wondering why he delayed his entrance.

"Introduction," he answered, knowing her question before she asked. He turned away from her as she proceeded to her seat, breathing deeply to calm his slightly racing heart.

He noticed, in that last exchange, that the bandage around her neck was different than the one he put on the bite wound last night. That meant, somehow, the original one had come off. It could mean that someone had discovered his mark on her, which was why his heart began to lose control.

"…Sora, please introduce yourself to the class." The teacher's voice drifted from behind the classroom doors.

As he entered, the same silence that accompanied his entrance in math was present. Keeping his face calm, he scanned the room, noticing the conspicuous empty seat beside Kairi. He was pretty sure that it wasn't void of an owner before this morning.

"Ohayou gozaimasu," he said, repeating the same introduction he made earlier in AlgebraIII. The response from the students was nearly identical to each other, mesmerized and deeply interested. All but Kairi's, which was more curious than the others, like she wanted to still learn more about him, about him being a vampire.

Don't think that way! he told himself. You need to separate yourself away from her. Not get closer.

But achieving the separation seemed difficult as he found himself sharing a lab table with the person he was trying best to avoid. Again, he masked his thoughts and emotions with a blank look and took his seat beside Kairi.

Despite attempting to act cold toward Kairi, Sora found himself stealing glances toward her, only to find her intent on focusing on Yukito-sensei's lesion. He concluded that chemistry may not come easily to her, unlike himself. This he found amusing because her father was quite fluent in the area of chemistry. How else would he be able to invent the blood tablets?

-----

"What do you have next?" Kairi asked promptly when the bell rang.

"Lunch. And then I have World History with Axel-sama," he answered, trying not to make eye contact with her. His plan for keeping cold definitely wasn't working. His heart wouldn't allow for him to hurt Kairi that way.

"I have lunch too," she answered, getting up from her seat and straightening her plaid skirt. "But I have Literature with Yuuko-sensei today. Guess we just missed each other, huh?"

"I guess we did," he replied, keeping his voice as distant as he could possibly make it. He followed Kairi out of the chemistry room to the cafeteria.

"Roxas and Demyx are going to be in the same class as you," she stated as they proceeded down the hallway, "and Naminé has Lit with me. Riku too."

Sora willed himself not to respond, fighting his body to not react to Kairi's voice. Kairi, noticing the silence, looked up and found him turned away from her, like he had been several times that day. In silence, they continued their way to lunch. Questions formed one after another in Kairi's mind, but two stood out among the group.

Was he avoiding her purposefully because she now knew he was a vampire? Or was there a deeper problem root within this mess?

-----

Sora was grateful for his third mod class because he wasn't around his only temptation. He was able to not speak to the rest of the students, but not Kairi. He was able to keep his eyes focused on everything other than the students, but not with Kairi. No matter how much he fought to keep her out of his mind, she would find her way back into his thoughts.

"Sora…" Axel read on his attendance list, his eyes lighting up at the name of his new student. "I'm glad that I got to have you in one of my classes."

"Axel…-sensei," Roxas added after a short beat of silence, "don't make a show of it. Sora's just like us. No big deal."

Noticing the emphasis Roxas placed on the word 'us', Sora took his seat beside Roxas and in front of Demyx. The seating arrangement only made it more terribly true: he had officially belonged with them, now that he had the blood of another person flowing inside him. One of the reasons that Kairi and him needed to not be so close.

"Okay class. Open your text to Chapter Five," Axel announced as he began to erase the previous history notes off the board.

-----

"He's been around for 550 years?!" Sora exclaimed quietly when Roxas answered his question about how Axel seemed so knowledgeable about the subject matter. The three boys were walking out of Axel's class and down the stairs to the main floor.

"Well, when you're a vampire, you age extremely slowly. And since Axel-sama is a Superior, he ages even slower than we would," Roxas replied.

"It doesn't seem like you and Demyx are aging slowly," Sora pointed out. "I knew you guys even before my change."

"Our childhood and teenage years pass like human years. It's only that way so we can grow up amongst humans without fear of being exposed as we enter school," Demyx answered, sounding quite smart.

"What about me? Will my life pass by slowly like you guys?" Sora asked. If his life developed at a slower pace than Kairi's, he would physically be younger than her. How awkward would their life become if that happened?

"Well, yeah, you've become one of us," Roxas responded, "but that's only if you survive the…" he trailed off, not wanting to finish the dreadful thought.

"Hey Sora!" Naminé's voice extended across the hallway toward the trio of boys. "Hey Roxas. Demyx." She waved to them, flagging them over.

"Look," Demyx said, "Kairi and Riku are with her this time."

"I wonder why," Roxas pondered, nudging Sora with his elbow. "They don't normally wait for us. Riku does sometimes to check on us, but never Kairi."

"Think it's because a new student's here today?" Demyx asked Roxas loudly with intentions of Sora overhearing.

"I guess I'll be heading to last mod with Naminé now," Roxas announced as Naminé took a few steps away from Kairi toward him. "I'll see you guys later."

"See ya later," Demyx said as Sora told Roxas, "Bye then."

"I'll get going too," Demyx stated. "Don't want to be a third wheel like Riku would be."

"No, don't—" Sora called after him, but Demyx dashed away too quickly for him to say anything. After letting out a sigh, Sora realized that Riku would be with them, so everything would've been fine. But that was until Riku walked away also. Nothing seemed to go right or wrong for him. Slowly, he dragged himself toward her.

"Hey Sora," she greeted him cheerfully, "how was class with Roxas and Demyx?"

"It was okay," he answered, cursing himself for not being able to deny his heart.

"What class do you have next?" she questioned.

"Drawing I," he replied, hoping for the best and the worst.

"Same as me," she responded gleefully. "Guess we can't stay away from each other for too long."

Sora paused, missing a beat. Emotions swelled up inside him when the news finally sunk in. There was no way he could put her in safety's way. Fate wouldn't comply with him. If it would, he would be able to ignore her, be cold to her, and they wouldn't have ANY classes together. This bond of deepness was only hurting her. Even he wasn't benefitting from this contract. The only person gaining favor in this relationship was…that person.

"Sora? Are you okay?" Kairi asked. "The final bell's gonna ring. We should get going if we don't want to get in trouble."

"You don't understand Kairi!" he shouted, but it didn't matter because they were the only people in the hallway. "There can't be no 'we'!"

"What…what do you mean?" she asked, her voice firm. "Why can't there be a 'you and me?'"

Sora opened his mouth to explain, but he paused, deciding that the hallway where anyone could hear them wasn't the best idea. Grabbing Kairi's hand, he pulled her into the nearest empty classroom, closing the door behind him. He pushed her gently to the door, leaning closely to her neck. He hesitated, feeling the warmth of her skin on his cheek.

"Why can't there be 'a you and me?'" Kairi asked, her breath catching in her throat. "Why Sora?"

"Didn't you hear it last night?" he replied, his eyes closed in pained content. "Didn't you hear the sound of me drinking your blood?"


Find out what happens next in Chapter Five: Confrontation.