Disclaimer: I don't own Detective Conan/Case Closed in any way or manner

There was a superstition a long time ago. They said that if a black butterfly touched someone, they'd die. I never believed it, but whenever I'd hear it, I'd always think about the tattoo etched into my skin…

A pair of dark chocolate eyes gazed into a cup of some form of juice, although it didn't look very safe to drink. A young boy looked up into the cup with a curious expression.

"What's that?" he questioned his sapphire eyes glimmering with curiosity. He pointed with one small finger at the cup.

"It's poison," and now a gloved hand placed the concoction far out of the boy's reach. One couldn't be too careful. "Shouldn't you be with your um…parent?"

"He'll just tell me I'm in the way," the boy pouted slightly. "And I don't know where sis is…"

"Well, you shouldn't be here. Almost everything here is poisonous," a gloved hand picked up a packet of white powder. "Or at least it is in certain doses."

"Really? Is the stuff in there poisonous?" the boy pointed at a slightly wrinkled paper bag, like the ones grocery markets gave out.

"Oh, well…you wouldn't want to eat it," a red leather glove went into the bag and removed a plastic container full of mice. "They're my control subjects, but if you want to play with them for now, you can."

"They're so small!" the boy looked at the rodents, some sleeping others staring, one gave into its curiosity and ran up to the boy. Small red eyes gazed into the sapphire ones. "What are they for?"

"I use them to test my antidotes," the answer was blunt and brutal. "To see if they work."

"You make antidotes? That's cool!" the child smiled.

"It's my job. All the poisons on that wall have no cure," caramel hair was swept back into a ponytail. "So outside of detective work, I find cures to them."

"You're a detective too?" glowing eyes now gazed at the young woman. "I wanna be a detective when I grow up too!"

"Hah, you'll be just as good as that Kudo kid," there was a clinking of glass as the girl removed some unknown substances and placed them onto the counter. Then she placed a pair of goggles over her eyes. "I'm just a fill-in until he finally decides to show his sorry hide again."

"Ah! You mean Shinichi?" the boy gave a wide grin. Chocolate eyes glanced at the small child.

"You know him?"

"Yeah, sis always talks about him, and sometimes he calls us!"

"I see…well, next time you see him, tell him to hurry up and get back here," the woman began to mix the thick substances. She placed the mixture over a flame and it slowly began to thin itself. "From Akai Papillon."

"Okay…" there was a small thought in the boy's mind. He'd heard the name Papillon before, but he didn't remember from where. "I'll tell him!"

"Conan! There you are!" another girl came into the room. She was taller than Papillon, and probably just as old. "Sorry if he was bothering you."

"No trouble at all," there were more clinking noises as the brunette took a flask off the fire. "Feel free to--!"

"Papillon!" an officer ran into the room. "There's been another murder, and we need you on the case!"

"Another one? How many murders does Tokyo get?!" the detective scowled. "I should go back to Osaka, it's actually calmer there."

"You're from Osaka?" Conan gasped. "Do you know Heiji?"

"Who doesn't know Hattori Heiji?" there was a distant look in the girl's chocolate eyes. They glazed over with a familiar look that Conan made note of. "He's the chief's son, and he's just as good as that Kudo, if he's not better."

"Papillon!"

"Right," Papillon shed her white lab coat and removed the protective goggles over her eyes. "Though it'd probably make more sense to put one of the detectives on the case…"

"Not with poison, right?"

"Now that you forgot to tell me," red leather met a jacket of the same material as the young woman exited the room. "Tell me where all this talk about murder was again?"

"Down a few blocks, nearby the supermarket," the officer claimed. "An investigator is already there."

"Good," and the girl stuffed a single hand into her pocket and removed a key with a large jeweled butterfly keychain. "Let's see if Kudo finally decides to show up."

It was strange, seeing the change in character at the mention of poison. Suddenly Papillon seemed more aggressive about going, or at least, more willing to go. Her eyes flared wildly with passion and hate at the same time once before she left the room.

"Wait, can she drive?" suddenly the question seemed more important than the fact that the detective was already gone.

"Oh, Papillon? She rides a motorcycle," the officer shrugged. "I think it's dangerous, but she's still in one piece."

He said more, but Conan was no longer paying attention. He looked at the wall of poisons with no cures. There were labels on many of them with the ingredients and the source of the poison. But one in particular stood out to the boy.

"Apotoxin-4869 (APTX4869) ingredients: unknown source: unknown…" the boy read the words carefully. "Effect:, untraceable poison, causes death. If diluted or on rare occasion reverts consumer several years. 100 fatal on small children. Priority cure."

He couldn't believe his eyes. Someone had managed to get a sample of the poison the men in black coats had used on him. Something struck the boy as odd, but he kept it to himself. There was no need to reveal his identity then.

Meanwhile, several blocks away, Papillon turned into a parking lot, her motorcycle roaring. As soon as it was safe to do so, the girl got off the sleek red vehicle and removed her crimson helmet. Sure enough, there was a crime scene investigation unit examining the seemingly uninjured corpse. Uninjured outside of all the blood from when it hit the floor.

"Excuse me, sorry officer, gotta get through," the girl pushed her way to the deceased. She found a middle aged woman with dark hair gazing up into the sky with eyes that would never see again. "Twenty-six?"

"Twenty-eight," the inspector replied while carefully examining the pale skin. "Poisoning we think."

"Hmm…how long?"

"Two hours maybe? She was thrown off the roof not long ago," the inspector claimed. "There are witnesses over there."

Sure enough, two terrified young boys, no older than twelve or thirteen were being questioned. Papillon nodded and moved over to the youths.

"Hey, can you leave us alone for a while?" the detective tapped the police officer questioning the two boys. He glanced at the caramel haired girl and nodded before moving away. Now deep chocolate eyes glanced back at the boys. "Hi, I'm Papillon. I need to ask you a few questions if that's okay with you."

"U-uh-h-h…huh…" one of the two shivered. He was an American, his accent marked him just as boldly as his hair and eye color. "W-w-we didn't d-do anyth-thing…"

"Shh, it's okay, I know. You see, I'm an expert on murders involving poison, and I know that the woman over there was poisoned. I know you two didn't do anything," there was a soothing quality in her voice for some reason. Perhaps it was because she herself was closer to their age. "I know this is really scary, so if you don't want to answer, just tell me okay?"

"O…ok-kay…" the second boy was smaller, but his Japanese was easier to understand.

"Alright, did you know the lady over there?" Papillon was careful to use words they knew. It made her speech sound more familiar, and it probably calmed them down a little.

"N-no…we were j-just w-w-walking h-home from the s-super market…" the American boy responded. His blue eyes were shimmering with fear. Papillon gave them a moment to gather their wits again.

"What I'm going to ask you might be really hard to answer, so just calm down and try okay?" she knelt down to their level, looking both of them in the eyes (not at the same time of course) and placing her hands on one of their shoulders. "Can you tell me what you saw?"

For a long moment, Papillon didn't think she was going to get an answer. There was silence, and suddenly one of the boys burst into tears.

"S-someone was o-on th-th-the roof a-and h-he p-p-pushed the lady off!" the smaller one wailed. "And…and then, th-this r-really pretty l-lady w-with r-really long h-hair…sh-she got into th-this b-black c-car a-a-and d-drove a-away…"

"I see," Papillon nodded slightly, acknowledging that she knew the reason for whoever it was throwing a body off the roof. "Do you remember what color her hair was?"

"B-blonde…" the smaller boy shivered. "A-and sh-she had g-g-green eyes."

"Alright, thanks. That's all I need to ask you," Papillon frowned internally. There was something off about the situation. The murderer didn't seem to care if they were found out. She got up and moved back towards the body.

"The impact messed up some of the stuff pretty badly," somebody said. "I can't be sure what kind of poison was used."

"Maybe a Yew seed?" Papillon gazed into the unseeing eyes. "Or maybe lots and lots of chloroform…"

"Are you just guessing?"

"Well, I haven't gotten much closer than three feet within the body you know," and now the girl in red leather knelt beside the lifeless body. "Now I can make better guesses."

There was silence from the young detective as she stared down upon the woman. Her eyes were glazed over, and there was some swelling in the face. Some sort of rash on the throat was apparent as well. Papillon paused slightly, her chocolate eyes narrowing. It was almost as if…

"Did anyone think to open her mouth?" the girl suddenly questioned. One of the inexperienced team members fumbled to pry open the now stiff muscles. Sure enough, the tonsils and the throat were inflamed. "…you idiots…"

"What?"

"What? What? You idiots! You should have checked her mouth before calling me over here. She wasn't poisoned at all!" angry eyes flared at the men. They had been burning with passion earlier. "Does this woman have allergic reactions to any kind of food?"

"Oh, she's deathly allergic to…seafood," the officer flipped through a pad of notes. "And she's very sensitive to it."

"Idiots, check her stomach for any traces of seafood, even the slightest bit could have set off an allergic reaction. You know what that means of course?" Papillon placed her hands on her hips and then leaned forward. "She died of an allergic reaction, there was no point in calling me out here."

Without another word the girl turned on her heel and began to walk away, the hard heels of her crimson boots clicking against the hard asphalt. Irritation jerked her mind as she kicked her leg over her large motorcycle and insert the keys.

"Sometimes, I wonder if the chief even looks at who he hires," the detective growled to herself before speeding off. The sight of a black Porsche following her made the girl tense up. Perhaps it was someone she knew playing a prank. Though nobody in their right mind played pranks on her. Well, outside of Heiji, but he was in Osaka.

Well two can play at that game, Papillon accelerated and swerved around a corner before accelerating again. A high pitched squealing sound crashed into the girl's ears. She heard it loud and clear. Whoever was stalking her finally got the message. Can't beat that, can ya?

The girl turned her covered head and found that whoever was in the car probably wasn't planning on leaving anytime soon. She debated whether or not it would be safe to remove her helmet. They might have weapons, though a biking helmet wouldn't make any difference to a shotgun to the face…

Suddenly, just as soon as the girl removed the hard helmet encasing her head, the car backed up and vanished. Papillon let out a sigh of relief. She was bound to have a few enemies as long as she was a detective. She wondered if Kudo was even still alive.

Chocolate eyes glanced around the corner, making sure that the Porsche was gone before the owner of said eyes decided to creep back to her vehicle and kicking over it with one leg again.

"I'm not suited for this," she said, feeling her stomach begin to churn. Sickness began to tear at her insides again and the detective turned her head away before she could ruin the shiny metal on her bike with vomit. Papillon took a rag out of her pocket and wiped her mouth before starting up her bike again, this time slowly going towards where she started.

Meanwhile, many miles away, a certain green eyed detective was receiving a phone call from Tokyo.

"Hattori Heiji speaking…" the boy answered the phone. "What is it?"

"Hey, do you know anyone that works in Tokyo?" Conan's voice crackled to life over the phone. Green eyes blinked slightly.

"Huh? Tokyo?" there was a pause. "Can't you be more specific?"

"Like, a girl that works with poison? With brown hair?"

"Oh! Yeah, that's Papillon. She's only there for a week every month now since you've been…well, you know," Heiji thought for a while. "What about her?"

"She has a sample of the poison that those guys in black used!" Conan hissed over the phone. Heiji could feel his stomach drop at what his rival was implying.

"There's no way. No way at all," Heiji fiddled with the phone slightly. If she was involved with them…

"Then how did she get the poison?"

"Maybe one of them just dropped it or something. Papillon's not exactly the easiest person to outrun. I mean, she rides a motorcycle for crying out loud!"

The boy didn't want to say that the girl was part of the Black Organization. There was such a low chance…he shook his head. Papillon was ruthless in investigations, but other than that, she could be sweeter than anyone.

"We can't really be too careful you know…"

"She hates listening to people though, why would she even bother with the Black Organization?" Heiji muttered. "But she's probably looking for a cure for that poison."

"Yeah, and that's why she has so much of it," the tone was flat from the other side of the phone. "I'm gonna keep an eye on her."

"She's coming back tomorrow or the day after," the green eyed detective paused for a moment. "She's not exactly thrilled at going to Tokyo so often."

"Then you keep an eye on her," the shrunken detective replied.

"Yeah, right," Heiji frowned. "Like I really want to follow her. She's kinda scary when she gets mad, and I can only keep an eye on her during school."

"She goes to the same school as you?"

"Yeah, same class, and we normally go up to the roof to eat lunch with Kazuka. Papillon likes to bust the drug users up there, and it's nice," the boy found his mistake too late.

"You eat lunch with her?!" Conan growled.

"Well, it's not like I can avoid working on cases with her, and she can really grow onto you. Well, if she likes you enough not to flip you," the detective added as an afterthought.

"Right, keep an eye on her, alright?"

"Alright, alright, I'll try," Heiji sighed. "I'm telling you though, I won't find anything."

With these words the boy hung up, ending the connection. He wondered exactly when Kudo had met Papillon anyways. An entertaining thought buzzed into the detective's mind.

Papillon would probably flip Kudo when she met him.

A/N: Give me feedback! I need feedback! And if you can figure out who "the pretty lady with really long hair" is, I'll give you a big virtual smile.