CHAPTER ONE: Conan AND Shinchi?!

A/N + disclaimer, I don't own either shows or it's characters. Now that that's out of the way this will be my first cross over fic I know it's going to be a strange combo but please bare with me. I hope you all enjoy.

The raven haired boy lays across the Mori's couch reading a Sherlock Holmes novel, he sighs laying the book on his chest as he hears his phone ring. He takes out the little blue cell phone and looks at the caller ID, it's Haibara Ai he flips the phone open.

"Hello?"

"Kudo-kun I..." She stops being interrupted by Conan.

"I told you to call me Edogawa Conan Edogawa!" He spits sitting up in anger the book falling onto his lap. "You yourself said that you 'liked this life' and 'I'm not going to look for an antidote'. Ever since we took down the BO you've been sitting around enjoying going through your childhood twice while I sit here and think about what I'm suppose to tell Ran!"

"Kudo shut up!" She yells trying to tell him what she called him for. "I HAVE been working on the antidote and I just finished it last night, if you can get over here so I can make sure it works."

After that she hangs up smirking thinking about the look on Conan's as he realizes his mistake, Conan is stunned still holding his phone to his ear with his mouth hanging open. A wide smile spreads across his face thinking about the fact that he can finally be with Ran, he'll have to call her later after she gets back from shopping with Sonoko and tell her that Conan's parents came to take him back home. He writes a note saying that he was going over Agasa's house and leaves it on Kogoro's desk before leaving. When he gets there he finds Haibara leaning against her desk in the basement, she smiles seeing him, Conan holds out his hand with a big grin on his face.

"Gimme." He states, she rolls her eyes and sighs.

"There's something I need to warn you about first." Haibara says swatting his hand away, Conan gives a confused look while she leads him to a chair. She sits across from him after pulling up a second chair, she sighs once more trying to find a way to explain. "The drug... wont just turn you back..." He cocks his head to the right.

"What do you mean?"

"What I mean is... you wont grow you'll uh you'll split into two different people."

"What does that mean?" He asks although he already knows the answer.

"It means that Shinchi Kudo will be back but Conan Edogawa is going to stay."

"What?!" He yells standing. "Can't you find a way to get rid of him?" She sighs once more looking up at him.

"I tried the only way to get rid of him is to put a poison in the antidote that will kill him within a year or to murder him when you two split." Conan swallows. "There is one good thing though, you see after you two split Conan will have no memory of ever being you. He will still have your intelligence but his memories will start when you first met Ran Mori as Conan and the times you became yourself will just be gaps in his memories."

"So... he'll be his own person, but what about parents or relatives what'll he think about that?"

"All he should think is that he was abandoned and never knew his parents. Now," Haibara takes out a little pink pill and a needle filled with some sort of blue liquid. "this pill will split you. I'm going to give you the choice since you made him, in this needle is a poison that will make him gravely ill and kill Conan within a month or I could slit his throat when you two split."

Conan bites his lip, it's not like it'd be bad to keep him alive, he wont try to get Ran if he really thinks he's a kid. If he lets Haibara kill Conan it'd be murder not to mention what Ran would go through since Conan is like a little brother to her, he sighs even though he wants to there's no way he could live with himself if he let poor Conan die for his mistake.

"No... neither of those... lets just keep him alive."

Hiabara smiles, she wasn't too keen on killing Conan when he split although he'd act the same at first eventually he'd develop his own personality. She hands him the pill and a glass of water before leaving with the needle, he looks at the pill before swallowing it with a drink of water. He soon starts feeling the intense sick feeling of turning back into himself but instead of going through the pain like normal he passes out. A half hour later Shinchi wakes up to find a little boy sleeping next to him, he quickly gets dressed in the high school uniform that Haibara had left in the room for him and leaves to find her.

"Haibara! Look it worked!" She ignores him walking passed to check on Conan, she crouches down next to his and checks his heart beat.

"So..." Shinchi kneels next to her feeling nervous. "He's alive... right?" She nods as she rolls the sleeping boy onto his back, Haibara takes out a small pocket light, opens Conan's left eye and shines the light into it watching the pupil dilate. Conan moans swatting away her hand before sitting up.

"Haibara-chan uh what am I doing here?" He asks confused.

"Edogawa-kun, what's the last thing you remember?"

"I was reading a book on uncles coach." He says with a pout. "How'd I get here?"

"What about your parents can you tell me about them?"

"What?" He asks giving an even more confused look. "Of course they're overseas."

"Doing what?"

"Well they're..." Conan trails off. "Uh... I uh I don't know... must of forgotten."

"What about your father?" She asks knowing that he had an idea on what his mother was like. "What he look like."

"I... dad he... I uh..." He trails off. What does his father look like? Come to think of it what's his name?

"Friends, family, anything from before you met Ran-neechan?"

"Before..." He give her a lost look, nothing. He can't remember a thing from before Ran in fact even when he was with her there was a lot of gaps in thinking and how he solved crimes. He sits up putting both hands on his head. What's going on, why can he suddenly not remember anything?

"Hey, Conan you remember me though right?" Shinchi says trying to lighten Conan's mood seeing him in such confusion over his lost memories, the blue eyed child looks at Shinchi before smiling.

"Yeah! Your Shinchi-niisan, my cousin! You're finally back from that case?" He asks childishly forgetting about the missing memories.

"I sure am! How about we go to Mori's house and wait for her to come home? I bet she'll be real happy to see me." Conan nods and quickly leaves the room excited about seeing Ran happy although he couldn't remember why he cared so much, before Shinchi can leave Hiabara stops him.

"You must keep an eye on him through the week, I don't know for sure if his body will reject him as his own person so watch him closely after a week it should be fine though."

Shinchi nods with a slightly concerned look before leaving to the Mori's house with Conan. It's been three weeks since then, Conan seemed to be doing fine playing with the children and showing a playful and childish side that Ran wasn't use to. Although she found it strange at time and even thought he was sick for a while she was too preoccupied with Shinchi to do anything about it, after all what's so wrong about a kid acting like a kid. Shinchi and Ran started dating soon after his return although he was still trying to keep Conan's slight memory loss a secret from her it didn't come up enough to worry him. He had stayed over Ran's house for the first week he was back to watch over Conan, Kogoro had left for a investigation so Ran let him stay in her fathers room with Conan. Conan had thrown up several times through the week but Haibara had informed him that was just him getting use to having his own body but to tell her if it gets more frequent.

Through that week Ran had let Conan stay home from school thinking he had caught the stomach flu but he didn't feel sick, not even before throwing up. He'd just double over where ever he was and start throwing up surprising both him and anyone around him, Shinchi had to do a lot of work to convince Ran not to take the child to the hospital. When the week was up he stopped vomiting and was able to continue living his life or at least that's what they thought, after two more weeks Conan got sick once more but it wasn't like the first time. This time he showed he was ill, couldn't move, body hurt , headaches, stomachaches, and a high fever. Kogoro was to take care of him while Ran and Shinchi were at school, they both watched over him until after dinner, and Ran watched him when Shinchi went home for the night. At first Shinchi had thought that Hiabara poisoned him but she explained that she hadn't gone anywhere near Conan with the needle and had gotten rid of it not long after Shinchi and Conan split. He seemed to be getting worse and worse though the week both Ran and Shinchi were extremely worried without a clue on what to do.

A/N: Thank you all for reading I really appreciate it and hope you liked this I'll be sure to upload the next chapter soon.