Male OC X Kimetsu No Yaiba / Demon Slayer

Perplexity

[Friendly warning:

Hey everyone, this chapter is weird I must say. I'm trying to make Katsuki a yandere but at the same time slightly well behaved because Oreki doesn't reject his existence. I promised to write 'fluff but now I'm not sure anymore whether or not I followed the term. So, this is a warning for underage kids. Author-san is freakin' 18! (2020)

FUTURE ME: NAH I NEVER CROSSED THAT LINE. THE STORY IS MATURE BECAUSE OF THE DEATHS AND DARK STUFF]

Katsuki's POV

Aww! It's raining tonight! I want to show Oreki those beautiful fireflies! I slumped on my red bean bag chair as I try to hide my disappointment. I can tell, he was so happy when I showed him those fireworks. Why does it have to rain now?!! WHY?!! WHY?!! WHY?!! WHY?!!!!!!

"Katsuki, are you okay?" Gasp! Oreki is here! I jolted and fall onto the wooden floor. I blink my eyes a few times when I see him staring at me. This is so embarrassing! I must have looked so stupid! I can feel my face heat up. "Are you sick? Wait... can a demon get sick at all? Or is it something else?" He tilts his head in confusion. Oh, I've worried for nothing.

"I'm okay! Just a little surprised!" I smiled. "Next time, you should knock first!"

"...But this is the living room. I have no reason to knock on the front door while I was already inside the house."

My face turns red again. AAAAAAAAAAHHH!!! SO EMBARRASSING! I DON'T KNOW WHERE TO HIDE MY FACE!!!

"Katsuki." He places a hand on my forehead. "Do you mind discussing something with me? Or would you like to rest since you don't look too well? Your face looks like it's burning."

The answer is obviously... "NO! I prefer discussing things with you rather than take a rest! I'm not sick! Really!"

He stares for a few seconds before letting out a sigh. "Fine. I believe you." He grabs my arm and throws me to my bean bag. "You took long enough to get up from the cold floor. You might be a demon, but you're still important to me. I can't help but worry. If something is bothering you, feel free to tell me." M-me? Oreki is worried about me? Aww~

Get yourself together! Oreki said he has something to discuss! Cut off the delusions! I adjust my position on the bean bag and sees Oreki already sits on another bean bag across me... eating Dango... like a certain Uchiha.

"Akaza was defeated. I expect the outcome will slightly change. Before I form a plan, may I asks you, how much do you remember about your past and this world? Can you summarize it?"

"Yes. I remember my past clearly, but I forgot the character names and the plots for this anime. I remember their faces though. I grew up with my new big brother, which I was late to realize that he's Upper Moon Two. We're not close. I always avoided him and everyone else, not trusting them even the slightest. I left him since he got promoted as Twelve Demon Moons. I spend my second life mostly killing 'pests' or trying to find you."

"Grew up... with a sibling... That's weird. If you can remember, why can't I remember?" Oh, shoot! "If I got reincarnated as well, why can't I remember my childhood? What kind of parents do I have? Do I have any siblings? Or..." He paused. "... Am I... perhaps... alone again? Did the people call me a demon and make a disgusted face whenever they saw me? Have I done something wrong?" Oh no! Oreki is depressed!

I get off from my comfy bean bag, pick the Dango and shove it into Oreki's mouth. "Don't say such negative things about yourself! You're not alone, remember? You have Shukaku, Matatabi, Isobu, Son Goku, Kokuou, Saiken, Choumei, Gyukki and Kurama by your side as you grew up! You even have a Demon Lord as your mentor! And now, you have me! You'll never be alone!" I said that with my newfound determination.

Oreki pulls out the stick and munches the food. "I'm just wondering. Besides, I also want to know if I had changed the plot in the past." He swallows it. "I'm aware that I look just like Kyojuro Rengoku, but I'm not sure what our relationship is. Cousin? Or I just born like this?" I paused. So he's not depressed? Why is it so hard to tell?!!

"Well... what will you do if you found out the truth of your past?"

"Hmm... good question. I'll fix the mistakes I might have done. That's all I had in mind."

I grip my hand into a fist. "Then, how about me?" What will happen if Oreki remembers? I don't know why he forgot his new family in the first place, but then... how will he react if he knows Kyojuro and him are related? He even calls Oreki 'Oniichan'! THAT MEANS THEY'RE CLOSE!

"Eh? What do you mean? Of course, you're coming with me." He said that as if it's the most obvious thing in the world.

My emotions got mixed up. I'm confused. "S-so! You're not leaving me?! Right?!" Part of me is happy, and the other one is my doubts that worry me. Then, I realize that I'm too close to him. Not enough of that, my tears flowed due to me being quite emotional earlier.

"There, there." Oreki... PULLS ME INTO A HUG AGAIN?!! OH MY GOSH! I'm so happy! I hoped he would hug me more often!~ "You told me not to have negative thoughts but look at you now. What happened to that determination you got earlier? I must say, it's kinda cute." C-cute?!! Oreki called me cute?!! AAAAAAAHHH! HE'S SO NICE AND INNOCENT, I WANT TO HAVE HIM ALL BY MYSELF!!!

He continues. "What makes you think I'll leave you? Here's the final answer. I'm not. So if there were voices inside your head tell you otherwise, don't bother them. Understood?" His voice is stern, but he actually cares. And the best part, he's not leaving! Yay!

"What I meant to say is, I'll drag you along with me. We messed up the plot and now it's our job to kill the rest of Twelve Demon Moons. I'll always cover your back if you needed me. Are you okay with that?"

"Sure!~" You don't need to drag me, Oreki. I'll follow you even when you didn't ask me to~

"I wish I could meet Kokushibo. It'll be cool to fight him. Maybe Lord Lucky will be proud of me." DON'T SAY THEIR NAMES WHILE HUGGING ME! Lord Lucky is okay since you once told me that she sees you as her successor,... BUT NOT KOKUSHIBO! HE'S AN ENEMY! I HATE IT WHEN YOU ADMIRED HIM! I'LL RIP OFF ALL OF THOSE TWELVE DEMON MOONS TO SHREDS!

"Oh, are you feeling better now? Hugs work after all." I do feel better... until you said HIS name. I'll start sharpening the knives later~

"Uh... Katsuki?" I perk my head up. "How long are you planning to stay like this?"

... EEEEEEEEEEEEHHH?!!!!

He already unwrapped his arms but I still had mine around him. I could feel my face heat up again. I must hide my face! I bury my face to whatever surface nearby. I close my eyes tightly. OH CRAP! HE MUST HAVE TO THINK I'M A WEIRDO FOR BLUSHING! WHAT IF HE HATES ME?!! NONONONONONONONO!!!

"You're upset or something? *Sigh* I'm not sure what upsets you, but this... is pretty awkward." I open my eyes to see the surface in front of my face is a chest. Oreki's chest. OH CRAP! I MESSED UP! AAAAAAAAAHHHH!!! I CAN'T MOVE! MY BODY DOESN'T WANT TO COOPERATE!

"Now that I have better insights of things that happened, I'll form a plan with Lord Lucky. She's more experienced in battles so it's important for our success. I'll tell you immediately when I woke up. *Yawn*" With that, he drifted asleep to his dreamland. W-wait! Don't sleep yet! My face is on your chest and I can't move! Why did I always got into awkward moments whenever I'm with Oreki?!!  AND HE SEEMS OBLIVIOUS TO EVERYTHING!

Something in my mind clicked. Oh, yeah. I've read Oreki's diary that he used not so daily. In that book, Oreki wrote that he rarely interacts with people due to his condition of being called a demon. That means, 'interaction' is still alien for him and he doesn't know the boundaries of the types of interaction.

That's why he still thinks of me as his friend no matter how much my obsession wants him to notice that he's mine! I have to control myself before he finds out my dark nature!

His kind nature somehow tamed my other nature whenever I almost lost control. B-but! HOW COME HE DIDN'T TELL ME WHAT HE FEELS WHEN I HIDE MY FACE HERE?!! AT LEAST TELL ME THAT YOU'RE EMBARRASSED AS WELL! B-BAKA!

*Intense blushing *