Pre-planning (aka System X's very detailed and useful guided plan)
Step 1: Lure Kageyama into your house.
Step 2: Dye his hair pink.

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X, you really are of no help... Like what the heck is that?

A plan for you to complete the mission, of course ^•^.

I blinked.
How in the world is that even a plan? 😃

Well, it is, and you better use it.
Or else.... (◕ᴗ◕✿)

Okay, okay, no need to threaten.😀

Hm, alright... let's see...
Step 2 is sucky as heck.
Can I get Kageyama to even enter my house first is the already an issue... ah whatever.
Assuming that I somehow manage to get Kageyama into my house, then what should I do?
How do I get from Step 1 to Step 2?
There seems to be a lot of missing actions and processes that need to happen before bridging from Step 1 to Step 2.

So how should I go about dyeing Kageyama's hair?
I can't just go like, 'Kageyama-kun would you please be a dearie and let me dye your hair to another colour? And not just any color, but hot pink🔥. Pretty please 🥺'.

Yeah no.
Though that would actually be rather interesting to be carried out and seen.😂
However, despite it being feasible it's not a very effective method for achieving my end goal of ensuring that Kageyama's hair is no longer black, but pink by the end of the day.

Maybe I could knock Kageyama out...

Too violent M/N.

"Never knew you had a heart X."

I personally don't think I do, but I'm saying that in your favour M/N.
Namely, because you don't have enough money to pay for his medical bills in the event that he does get a concussion or something from the process of you knocking him out.

"Oh. You're right. I wouldn't be able to afford his bills 😭. Next idea I suppose."

Hmm, I've already ruled out earlier the asking politely scenario, so that's a no-go since the chances of Kageyama actually agreeing to change his hair color to something absolutely extravagant like hot pink would be non-existent. And believing that he'd agree would not only be ridiculous but also definitely not well received by Kageyama.

Plus it'll only cause him to raise his guard up making it more difficult to trick him into dyeing his hair in the future.

My goal is to ensure that I only do it once, and do it well.
So how should I be as unsuspecting as me adding laxatives to Coach Yushi's water...?

Wait! Water!
Oh, I know exactly how I'm going to do this.

"X, anime logic exists here right?"

Most definitely.

"Then it'll be no problem at all."

Okay?
I have no clue as to what you're planning, but judging by your smirk, I think I'm going to like it.

-

Alright now I just need to pour this neon pink hair dye right into the shampoo bottle, and we're set!

Now I just need to ensure that I don't accidentally use the wrong shampoo to shower.
I really don't want to dye my hair, not to mention dyeing it pink. I have nothing against coloring your own hair, but I just really like my natural hair color in this life.

Now, time to encourage Kageyama to come visit my house after Volleyball practice later today.

-

Sounds of the water running in the shower indicated to M/N that Kageyama has begun to rinse himself off. And at that moment, a cheeky smile bloomed on M/N's face as held a fluffy white towel in his hand.

Kageyama had rushed into the shower too quickly that M/N hadn't had the chance to pass him a towel

Heading towards the bathroom that Kageyama was bathing in, sounds of water splashing increased in volume as a permanent grin was plastered on M/N's face.
Giving the toilet door a gentle tug, it was to M/N's delight when he found out that Kageyama had forgotten to lock the bathroom door.

Knocking just once as a courtesy to inform Kageyama of his presence, M/N pulled the sliding door open.

Kageyama was alarmed in the shower as he heard a quick knock on the door before it was pulled open.
Kageyama's eyes widened as M/N's slightly blurry figure could be made out from the steam. Thank goodness for M/N's bathroom having a translucent glass divider between the shower place and the toilet bowl as the glass panel did manage to shield the majority features of Kageyama's naked body.

"Hey Kageyama-kun, you forgot to grab your towel from me earlier. I'll leave it here for you alright?" M/N's voice echoed out.

"Yeah o-oka-ay, t-thank you." Kageyama managed to spill out as his face was still flushed red, and not exactly due to the rising steam from the warm water.

M/N was slightly disappointed. He couldn't exactly see Kageyama, only his very blurred figure through the glass. Despite so, M/N did manage to enjoy Kageyama's slick silhouette.

Apparently, M/N stood dazed on the spot for a little too long as Kageyama has spoken again, "Mind getting out? I'm still showering."

M/N pursued his lips before a gentle smirk graced his lips, "We're both males. I have what you have, so why so shy?"

"J-just get out!"

"Alright, alright. I'm leaving. M/N raises both his hands up in the air before looking at Kageyama's exquisite figure before exiting the bathroom.

Once M/N had left, it allowed for Kageyama to let out a sigh of relief before resuming his shower, completely unaware of the chaos that would ensue within the next few minutes.

-

"WHAT THE HELL?!" Kageyama's scream echoed out from the bathroom.

Ah, the cries of success. Beautiful~

"M/N! I'm going to murder you!"

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Scene fades out
Chapter 27 end.
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Bonus:

"Akiri-kun are you not going for a bathroom break?" Kindaichi called out questioning.

M/N shook his head, "Nah, I'm just going to take a rest here, I'm not in the need to go to the washroom."

"Hm, okay then... Oh! Could you do me a favor and help Coach Yushi refill his bottle of water?"

M/N's eyes gleamed as a smile tugged on the sides of his lips as he replied, "I'll be glad to."

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"Sorry, guys I need to go to the washroom real quick!" Coach Yushi announced, his face all scrunched up.

Everyone else took no notice of this, since it was completely normal, nature calls after all. And Coach Yushi was back within fifteen minutes.

However, not even five minutes had passed since the instant he returned from the bathroom, Coach Yushi needed to go again. This happened multiple times, with the coach's face turning green.

Everyone started gossiping about Coach Yushi and his continuous nonstop need to go to the washroom.

"Poor Coach Yushi, isn't it?" Oikawa spoke out.

M/N nodded absentmindedly, with no one noticing a satisfied smirk that played by the edges of his lips.

'Serves you right Coach.' 😄

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Author's note:
I have no clue what I'm writing here.... But the drama continues in the next chapter, so I'll see you there.

Anyways, please don't mind any errors, vote, stay safe and

Stay happy readers! (✯ᴗ✯)