This idea just hit me *grins*. I got this idea while I was drinking water.
Summary: Ever since Conan Edogawa lived with Kogoro and Ran, Kogoro finds Conan suspicious. He was suspicious of Conan again for the third time. The Great Sleeping Kogoro Mouri is determined to investigate who Conan Edogawa really is.
Disclaimer: Detective Conan is not mine.
Oji-san (Uncle)
Matte (Wait)
Nani (What)
Kuso (Shit or Damn it)
Naruhodo (I see)
Meitantei Kogoro Mouri was having his third suspicions about the brat, Conan Edogawa. Ran and the brat are both at the swimming pool now and he made an excuse to go with them later.
Think about it… Kogoro thought.
Why does that brat always interfering him while he is investigating? It's always annoying!
Whenever Kogoro got stuck on the case, the brat always helps him giving him some hints and clues…
Kogoro crossed his arms and closed his eyes trying to think deeply.
Kogoro remembered that he had a case trying to regain Maya-san's memory. Someone choked him using a wire. He was almost killed but thankfully, there's Conan that just saved his life just in time.
Kogoro remembered when he was about to get shot by the thief's gun then suddenly Conan was there and saved his life again.
Kogoro also remembered when Conan did the same thing Kogoro did ten years ago to save Eri but this time to save Ran. How does a kid knew how to use a gun?
Kogoro remembered that Heiji and Conan are always hanging out with each other. Heiji calls Conan Kudo-kun sometimes.
And lastly, Kogoro remembered that he always felt something sharp hitting behind his neck and then he falls asleep. When he wakes up, Ran told him that he solved the case and Kogoro couldn't even remember solving it by himself.
Kogoro remembered that the brat was shot and his daughter donated her own blood to Conan. Did she know that Conan was Shinichi? How did she know Conan's blood type?
Kogoro opened his eyes. He would probably asked Ran soon.
Matte…what did Conan use to make me sleep? Kogoro thought.
Kogoro doesn't have any idea of that. He needs to check Conan's clothes and personal items.
Matte, why does that brat always wear bowtie?
Kogoro intentionally asked his daughter and the brat to have a vacation with him on the beach just for this. He found Conan's shoes. He examined the shoes. He flashed back how Conan used the shoes. He found the white circle thing on the side of the shoes. He turned it around to a 90 degrees clockwise and the shoes glowed in different colors.
Kogoro looked shocked. Nani?
Kogoro quickly turned the same degrees counter clockwise and the glowing of the shoes disappeared.
Kogoro sighed in relief.
Kogoro found Conan's belt. He examined the belt. This looks like a weird belt… He accidentally pressed the button and a soccer ball inflates.
Kogoro felt his eyes widened in shock again.
The soccer ball dribbles on the floor.
Uh oh! Matte… Ran told me Shinichi always love soccer. Kogoro smirked.
Kogoro took Conan's watch. Hmm… He pressed the button on the right side of the watch. The lens of the watch opened. "Huh?" Then, a tranquilizer dart flew out from its place.
Naruhodo… so this was the thing the brat uses to put me to sleep!? That is why I am being called Sleeping Kogoro! Kuso! Kogoro gripped the watch angrily. Then he set it down carefully without destroying it. He doesn't want Conan to find out.
Kogoro took the mysterious bow tie. He examined it closely. He turned the bow tie around and he discovered something behind it. He tried to figure out how to use the bow tie. "What's this?" He rotated the dial. "What in the world does this thing do—" His voice suddenly changed. He became Inspector Megure's voice. What the! M-my voice changed! Matte, isn't it Inspector Megure's voice? He grunted. "Mouri-kun" He mimicked. Then he giggled. He rotated the dial again. He grunted. His voice becomes Sonoko's. "Nani?" He said. He threw his head back then he started to laugh with his tongue out. He immediately covered his mouth. Oops, don't laugh too loud! He rotated the dial again. He grunted again. His voice changed to Heiji. Hmph, that stupid high school detective from the west! He rotated the dial again. He had fun playing with the voice changer bow tie. He grunted again. His voice became his own daughter's voice. "Conan-kun…"
Kogoro had enough. He looked angry that Conan is also using his own daughter's voice. He will reveal Conan's true identity.