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Detective Kokichi Oma: The Case of Absurdity (Talentswap/Domestic AU Saiouma)

Summary:

In their shared apartment, Kokichi tries on Shuichi’s clothes—and a new role—by staging an over-dramatic noir detective bit.
Shuichi indulges him with fond teasing, steady affection, and the quiet reassurance that some things are allowed to become a “him thing.”

Post-canon fluff with humor, trust, and a very unserious detective.

Notes:

This fic is set post-canon and treats my earlier Kokichi fic (my Talent Swap Detective Kokichi Holmes fic) as established history—hence the brief reference in the closet scene. I wanted this to be a small, domestic moment where Kokichi’s theatrics are met with patience, teasing, and trust rather than consequences.

No angst here—just playful role-play and two people who already know each other well.

Thanks for reading!

(See the end of the work for more notes.)

Work Text:

Kokichi and Shuichi are in an office apartment. 

 

Kokichi: (saying this to himself) Well, what should I do today?

 

Shuichi: What are you saying Kokichi?

 

Kokichi: Oh nothing Shumai, just planning to myself, nothing spectacular or anything neeheehee!

 

Shuichi looked at him confused.

 

Shuichi: Oookay then.

 

Kokichi: I have one question though.

 

Shuichi: What is it?

 

Kokichi: May I borrow your clothes?

 

Shuichi: Again? Why, though?

 

Kokichi: Oooh hmm… you’ll see my precious Shumai.

 

Shuichi: Ookay then sweetheart. Just be careful. I trust you wouldn’t ruin my clothes.

 

Kokichi: Ohhhh no promises my precious Shumai neeheehee! I’ll be seeing you later, my beloved detective.

 

Shuichi: See you later then.

 

Kokichi walked over to a closet in Shuichi’s room and tried on Shuichi’s outfit.

 

Kokichi: Alright, perfect for the role again! I knew he wouldn’t mind. Man, even after the K1-B0 incident. Heh. Anyway, I have a plan for Shuichi here. You’ll get to see it soon neeheehee! The Ultimate Supreme Leader will become a detective once again!

 

Kokichi walked out of the closet and suddenly pitched his voice down a few octaves like he was a detective at a film noir movie.

 

Kokichi: This city… It is raining. All the hustle and bustle. I, Detective Kokichi Oma, am the private investigator in this case.

 

The screen turns to color.

 

Shuichi: Uhh… Kokichi, it’s sunny outside. What are you doing?

 

Flashes back to black and white.

 

Kokichi: This crime in the city of angels. I’m a hard boiled detective.

 

The screen turns to color again.

 

Shuichi: What is this?

 

Flashes back to black and white again.

 

Kokichi: She says in confusion.

 

The screen turns to color.

 

Shuichi: Wha- I’m a man!

 

Kokichi: Neeheehee! The roles have been reversed!

 

He sits on an arm chair like he was smoking a pipe.

 

Shuichi: Uhh… What are you doing in my chair?

 

Kokichi: Oooh just having fun here! I had to play detective with you! It’s just too much fun!

 

Shuichi: You sounded adorable when you did the film noir voice.

 

Kokichi looked shocked in surprise.

 

Kokichi: Wh-gh! I DO NOT! This supreme leader is not the epitome of cuteness incarnate!

 

Kokichi stopped for a second.

 

Kokichi: Wh- did I say that out loud?

 

Shuichi: Yes you did.

 

Kokichi: DAMN IT! Me and my big mouth!

 

Shuichi laughed heartily.

 

Shuichi: But it was a good attempt. I’m impressed. But you still look adorable in my outfit.

 

Kokichi pouted.

 

Kokichi: NUUUUU! I’m noooot!

 

Shuichi: laughs I was teasing and messing with you sweetheart.

 

Kokichi: Mrrp.

 

Shuichi: Aww. That was cute!

 

Kokichi: Nope! That didn’t come from me either! You’re hallucinating! You’re hearing things!

 

Shuichi laughs even more at Kokichi’s antics. Kokichi cracks up in response

 

Kokichi: Oh my god. Your laughter gets me Shumai! The Ultimate Supreme Leader has been defeated by an adorable laugh such as yours!

 

Shuichi: Now look who’s talking.

 

Kokichi: Gh! Mmmmm.

 

He flustered in embarrassment.

 

Shuichi: Anyway. That was actually pretty fun. I was just curious about what you were doing.

 

Kokichi: I’m glad you liked it though. My adorable precious Shumai. Who knows? I might do it a third time but we’ll see! Neeheehee!

 

Shuichi: I think it’ll be a you thing at this point and I’m fine with that.

 

Kokichi: Heh, ladies and gentlemen, my Shumai approves!

Notes:

Thank you for reading! Writing Kokichi committing fully to a bit—and Shuichi indulging him—was a lot of fun. Sometimes a fic really is just about letting a character be strange in a safe place. This is part of my ongoing post-canon Saiouma continuity, and I always enjoy writing these quieter moments between bigger stories.

Podfic Permission:

Podfics, radio-play adaptations, and multi-VA versions are welcome for this fic. Feel free to add music, sound effects, or adapt it into an audio drama format—just please credit me and link back to the original work. Creative freedom is encouraged; have fun with it.

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