This is not just a Misa x reader. I feel like it's more realistic to have Misa slowly realize that her feelings for you are more than just a friend. The others will get their part as well
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It was later in the day when L was assisting Misa with her acting performance. Both you and Light were seated to the side, watching.

I hope Rem doesn't get the paper to touch Misa.

As you were blanking out, Light spoke.

"You keep staring at me," Light pointed out in a joking way.

Shoot, I didn't realize

"I was lost in thought," you sigh.

"N/n! Can you please help me? Ryuzaki doesn't like my performance. " Misa asked

"Sure", you nod while you go to assist Misa As you were giving her tips, you spoke so only she would hear.

"Misa, since you have been working so hard, you may hallucinate. I read somewhere that you shouldn't interact with hallucinations. Just another tip, "you smile at her. It appeared as a friendly tip, but it was a precaution.

"I'll be fine!" Misa tells you

It's better to be safe than sorry.. if Rem appears, I can just hope she follows this advice

"N/n, will you come with me to the audition?" Misa asked with a hopeful smile.

This was heard by L and Light, while they both exchanged a glance.

You were about to respond until you got another task. You curse under your breath.

Task: Go with Misa Amane to the audition and prevent the meetup between Rem and Misa.

Reward: Death Note

Punishment: You will lose all of your memories.

Should I even be allowed to have a death note? Isn't that too OP?

You were waiting for an opportunity to use your phone to send a message to the number you frequently text now, but you needed to finish the conversation.

"I don't think N/n should go. Remember how bad of an experience it was last time?" Light said

"I agree, this time they only asked for Misa" L agreed.

Favoritism at its finest 

 "We don't want you to cause more problems, you were in danger last time" Light added.

"That was rude, I didn't even start the problem" You roll your eyes

"Look at it this way, I'm sure they wouldn't mind having one more member, right? Also, Mochi won't be able to be besides Misa the whole time. Since I seem like a defenseless girl I'm sure they would put their guard down" You added on, hoping to convince them

"You both should know that I'm capable of protecting both me and Misa," you smile.

They both hesitantly agreed. After realizing that it would be beneficial. They also knew you wouldn't back down.

"Okay, be safe," Light told both of you.

It's nice to see him being nice to Misa. I still have to intervene between the two though.

Time skip to going to the audition

"Sorry to keep you waiting! Good morning! I'm Misa-Misa and N/n's manager, Mochi! Nice to meet you "

"Nice to meet you again," one of the officials said.

"We only invited Misa Amane," one of the more straightforward officials said.

"I needed N/n to support me." Misa clung to your arm.

"I guess this is okay," he responded.

"Good luck ladies!" Mochi waved goodbye.

Inside the meeting room:

"Well, this is our first time meeting Misa. I'm John Wallace, from the executive department" The undercover detective said

You wait outside, trying to hear what they're saying.

"Excuse me, may I use the restroom?" You heard Misa ask

About time

You wait at the front of the bathroom, awaiting a sign from Rem. You then noticed the paper towels slightly swaying, as if there was someone there.

Rem was about to touch Misa with a piece of paper, but you ran quickly into the bathroom and tackled her.

"Hey Misa", you remain on the floor, hugging Misa.

"Ahh!" Misa screams in shock.

"Sorry, I was just excited to see you." You eagerly told Misa

"I know this is out of nowhere, but I'm glad you're slowly getting over Light. I'm here for you if you need anything." you told Misa, helping her up.

You said this because you wanted to show Rem that she was getting over Light and it would be worse if she regained her memories.

Rem was about to touch Misa with the paper again but paused after hearing this.

'I guess she really does know everything about the future,' Rem thought to herself.

"W-why are you bringing that up?" Misa says defensively, not even refuting it like Rem expected.

"Misa, let's go out to eat later, just the two of us," you smile.

Rem looks down at Misa with a mix of happiness and sorrow.

"I'll talk to you later," you say firmly, meant for Rem, but it seemed like it was meant for Misa.

You patted Misa on the back, reassuring her that everything was okay. You then look at the statistics.

Misa

100% Friendship

20% Romantic

14% Obsessed

"Good luck, Misa!" You say with a smile

Misa smiles and skips out the door

"Now for you," you say, looking at the air

You felt your skin getting touched by a piece of paper.

"N/n" Rem spoke

"Rem. Did you not remember our plan?" You asked.

"I did," Rem said.

"I can now fully trust you," Rem adds,

"What an honor!" you scoff.

"You almost ruined the whole plot," you groan.

You look at Rem and see the statistics she had, but they were formatted differently.

Rem

5% Suspicion

80% Trust

0.3% Hatred

"N/n?" Rem calls out.

You look at Rem.

"What will happen now that Misa is not playing her role like intended?" Rem asked.

"I'll have to replace her," you smirk.

"You appear happy about this," Rem said, concerned.

"I'm thrilled. This is going to be challenging." You smile as you get ready to leave.

"After your current deathnote owner dies, please meet with me," you spoke.

Rem nods before placing the paper in your hand.

Rem gives you the paper and says "If anything happens, you could write on this."

You nod

"Thank you," you told Rem before getting ready to leave the bathroom.

"I'll see you later." You left.

You open your bag you were carrying and use your phone inside

The scene where Misa tries to honey trap the current death note owner and help with the investigation is no longer able to happen. 

I can either pretend to be Misa and fill her role, or I could just show the clip from my phone, the one Misa showed him originally

In the end, you went with the safer option and chose the latter. Misa no longer needs to get picked up by Higuchi, meaning a lot of events wouldn't happen.

You message your 'Sugar Zaddy'.

Sugar Zaddy 😍
what

You
How'd you know I was going to text you

Sugar Zaddy 😍
Unimportant, what's your question

You
Fan behavior,

You
You wanna kiss me so bad
it makes you look stupid

Sugar Zaddy 😍

You
Anyways

You
Where's my death note 🤨

Sugar Zaddy 😍
You will receive it when the time comes

You
You-

You
You did not, this was never mentioned in the reward

Sugar Zaddy 😍
It never said it wouldn't happen either

You
Your whole business is a scam

You
Give me compensation 😠

Sugar Zaddy 😍
If anything, you're scamming us

You

Sugar Zaddy 😍
Will $5k be enough

You

Sugar Zaddy 😍
Respond normally

You
Yes thank you

You
Bye now 😘✌️

You returned to the task force building with Misa and greeted everyone

"Hey, gang! I have some good news. "You walk into the main room smiling.

"What is it N/n?" Light asks curiously.

"I'll reveal this Kira's identity." you reveal

"What do you mean this, Kira? There's more?" L asked suspiciously.

"No off-topic questions," you reply.

"Anyway, thanks to Ryuzaki's allowance, I was able to buy a new phone. It's a really nice one too" you say proudly

"Look" You bring out your phone to show them the small part needed of his confession.

I should be allowed to do this... right?

(Insert a clip from YouTube of the confession from Higuchi, cutting out the part Misa is in)

"This is a really important piece of evidence. Thank you,
N/n... but didn't you say you wouldn't interfere?" Light asked.

"Why are you showing us this N/n?" L asked

"I messed up the plot too badly... there's no going back," you sighed, putting your phone away.

"Who originally got the confession?" Light asked.

You shrug

"Now that we know Higuchi is Kira, I suppose this is a win, right matsuda?" L asked, taking a bite out of his treat.

"Oh, there you are, Matsuda!" You greet him.

"Hi N/n" Matsuda greets you, looking down.

"You seem scared. Did anything happen?" You asked him

Matsuda shakes his head.

"I'm good! Fit as a fiddle " Matsuda smiles.

You look at his statistics.

Matsuda

80% Friendship

55% Romance

0% obsession

You move your phone away from the view of others and send a message.

You
What does the percentage of obsession mean

Sugar Zaddy 😍
The more obsessed they are with you

You
I know that, but what will they do
the higher they're obsessed

Sugar Zaddy 😍
A lot

You
Like a Yandere 😟🧐

Sugar Zaddy 😍

They become more attentive to you

And only you

You
😒k

You put your phone away and face everyone.

"Light, sorry for bringing up this topic again, but do you remember how to kill?" L asked Light directly. He turned his face back to the giant computer.

"You're still asking? I'm not Kira. " Light responds calmly.

"Just answer the question. Do you remember?" L repeated himself

"I don't," Light replied harshly.

"Misa, what about you?" Light asked Misa

"Again?! I'm not Kira. " Misa huffs

"Yagami, please think long and hard," L says.

You try to suppress your laughter, but you see a screen pop up with another task.

Task: Defend Light Yagami's accusation of being Kira

Reward(s): +5 affection w/ Light. -5 affection w/ L
+2 obsession w/ Light +5 obsession w/ L

Punishment: Random severe punishment

That's not a reward at all. It would look very suspicious if I defended Light. I'll decline. It's better in the long run.

You were just about to press decline, but before you do, you feel a buzz in your pocket. You have received another message

Sugar Zaddy 😍

Accept it, it's worth it

You
No it's not

Sugar Zaddy 😍
I assure you it is. Trust me

You
It better be. You will pay for my therapy if it isn't

"Light Yagami was Kira. He passed his power" L started his theory.

You take a deep breath before speaking up.

"Ryuzaki, currently, Light Yagami is innocent," you told L.

"Currently? So he was not in the past? " L inquired, finally turning to face you.

Damn genius

"Light has no recollection of anything with Kira. You won't get anywhere by asking," you say, biting your tongue.

This is embarrassing.. It's the truth, though. This reward had better be worth it.

"Y/n ..." Light says, eyes immediately widening in surprise.

That was loud enough for the whole room to hear. You turned around with your eyes wide.

Sugar Zaddy 😍
It was worth it... for us watching

You quickly read the message while Watari walks in with treats.

Light was about to explain himself, "N/n, it came out on its own."

"Y/n? Is that.. your real name?" Mr. Yagami asked

You remain silent. You were contemplating whether or not you should turn Light into the police now.

New task: Reveal your real name and allow yourself to be called by it

Reward: Sleep Potion (x5): whoever drinks one will be able to sleep for a year. No consequences or impact on the body.

Punishment: Go to Purgatory.

You scoff, Why would I need this?

Congratulations you won +5 affection with Light +2 obsession with Light. -5 attachment to L +5 obsession with L

Current statistics:

L
(-5 affection, +5 obsession)

85% Friendship

65% Romantic

15% Obsessed

Light
(+5 affection, +2 obsession)

95% Friendship

75% Romantic

3% Obsessed

Not the best time to put this display up.

You quickly pull out your phone.

You
Let me ignore my anger at you for
a second,

You
Will I see Ryuk in purgatory? 🤤

Sugar Zaddy 😍
No

You sigh as you press accept.

"Now that everyone knows your name, can we call you it?" Matsuda asks.

"Matsuda! Why would you-!" Mr. Yagami comes to your defense

"Yes, you guys can finally say it." you reveal your name

Congratulations! You've won 5 sleep potions, which allow whoever drinks them a year of sleep.

"Light Yagami. I will not blame you for this incident. Next time you feel something come out of your mouth that's not supposed to, bite your tongue off" you tell Light. You knew this must've been planned since he seemed to have said it unwillingly.

"Anyways, I will be leaving now," you say as you walk to your room to take a break. You make it to your bed and immediately collapse.