You were quite the prankster. You loved playing pranks on people!
And since you recently got a job working on the Kira case, this was a great opportunity for you to pull a few pranks at headquarters.

You really wanted to pull pranks on L though.

Misa was a good friend of yours, so when you walked into headquarters this morning, you told her that you wanted to have a little fun around headquarters and pull a few pranks and asked if she wanted to co-operate. She agreed and you both gave an small evil laugh.

"Come on" you say, dragging Misa out the main room and up the stairs.

"So who should we prank first?" You ask.

"You should prank L" Misa said.

"I can't do that" you say. "He'll see through it. You know how smart he is."

"True, but it's just for a bit of fun. If he sees through your prank, so what?"

"Well I guess your right" you say.

"So what are you gonna do?" Misa asked.

"I have a brilliant idea!" You whisper your plan to Misa and she laughed.

"Brilliant idea (Y/N)!"

You walked into the kitchen on your floor and grabbed some chilli sauce from your cupboard. Misa just kept laughing.

The two of you made your way back downstairs to find Light and Matsuda working hard. L wasn't there. He must've went to see Watari or something.

This was perfect!

You noticed L had left a plate of doughnuts on the table.

'Jam doughnuts. Just as I predicted!' You smirk to yourself.

You walk over to the table and cut a hole in one of the doughnuts, taking out as much jam as you could with a spoon.

'Time for the main event!' You say, smiling like an evil character from an anime.

You pull out the chilli sauce and pour some into the doughnut, trying to get as much in as you could. You hear Misa laughing in the background.

"Shut up!" You whisper to her. Surprisingly, no one seemed to notice what you were doing.

'Alright! Done!' You say, patching the hole up with the piece of doughnut you cut off. You then skip off upstairs with Misa and hide all your supplies so no one knew it was you.
The two of you then sat down. Misa sat next to Light, snuggling into his shoulder, whilst you sat in front of a computer and got to work.

You then hear footsteps coming down the stairs.

'It's gotta be L!' You thought.

You look over to see it is L. He sits down at his seat next to you and turns on his computer.

"Good morning" you say, trying to start a conversation with him.

He just nodded and reached for his doughnuts. You did your best to try and not laugh as L took the doughnut you replaced with chilli sauce and brought it to his mouth, taking a bite out of it.

It was fine for a second before L spat out the doughnut and shot out of his seat, choking. Everyone turning to look at him.

"What on earth was that?!" He shouts.

"Are you okay?" You ask, putting on your best serious face.

"There's something in my doughnut!"

"Yeah, jam."

"It wasn't jam. It was spicy" L started flapping his hands at his mouth like a teenage girl when they cry and ruin their mascara.

"Here, have some water!" You had a glass of water beside you and gave it to L.

He didn't even hesitate to drink it. He downed the water in one go and took a deep breath.

"Feeling better?" You ask.

"That was awful" L pants. "Someone just tried to kill me!"

"Kira?" Misa asked.

"I...do suspect Light to be Kira...and Kira wants me dead..." L says, putting a thumb to his lip and staring at Light.

"Wait! You think I did that?" Light looked up at him, surprised. "No way!"

"I'm gonna keep a closer eye on you Light Yagami" L says, glaring at him.

You silently chuckle to yourself and try your best not to draw any attention. This was going better than you expected!

L sat back down and got to work.
Misa looked over to you and smiled at you, while you gave her the thumbs up.

Soon, it got to the point where you got bored and wanted to pull another prank.

"Excuse me, I need to use the bathroom" you say, standing up and walking upstairs to find something else to do.

"If all goes well, maybe I can pull an even better prank on L!" You say.

You walk down the halls until you find yourself at L's room.

"Hmm..."

There was many things you could do in L's room...

"Maybe I'm going too far here...Maybe I shouldn't..."

You sighed.

"Well, I'm here now. I might as well have some fun while I'm here."

You took a second to think of a prank.

"He'll know it's me now, but as Misa said, it's just a bit of fun."

You make your way to your room first.

'It's fine. The cameras are off in here. They're only on when I'm in here, but L thinks I'm using the bathroom.'

-Time Skip!-

You come back downstairs, prank all ready.

"You sure took a while in the bathroom" L says.

"Well, on my way to the bathroom, I noticed the door to your room was still open. I thought you may have dropped something so I walked in-"

"You went in my room?"

Light, Matsuda and even Misa looked at you in shock.

"I was just looking to see if you had dropped anything. You never leave the door open!"

"No one is allowed to enter my room!"

'Time for my plan!'

"I found something in your room that belongs to me!" You shout.

"What? I don't have anything in my room that belongs to you" L says.

"I wouldn't be so sure about that! Check the cameras if you don't believe me!"

"Fine."

L turned to his computer and turned on the cameras to his room.

"What the-?"

On the floor in L's room, you had placed one of your frilly bras and panties.

"L! WHY THE HELL DO YOU HAVE THESE IN YOUR ROOM?!" Misa shouts.

"I-I didn't put them there!" L says.

"That's creepy L. What the heck?!" Light says.

"I never knew you were a pervert Ryuzaki" Matsuda said.

"I'm not a pervert!" L shouts.

"Well, what are they doing there then?" You ask, folding your arms.

"You must've done it (Y/N)" he glares at you.

"Are you serious?! Why would I do that?! I have to wear them! There's no way I would do that!" You say.

"Well, now we know that L really likes (Y/N). I mean there's really no other way of looking at this situation. Just say that you love her L" Misa says.

"I...well..." L scratched the back of his head as his face went slightly pink.

'Dammit. Maybe I did go too far...' You thought.

"Alright! Alright! I'll admit it! It was a prank" you say.

Everyone looked at you in shock again.

"It was only a bit of fun!" You say.

"So, L didn't really take your underwear?" Light asked.

"No."

"Why on earth would I do that anyway?!" L asked.

"You went too far with that one (Y/N)" Matsuda said.

"(Y/N), you do realise this is the Kira investigation headquarters. This is no place for fun and games!" L said. "Now, back to work everyone."

Light and Matsuda sighed and got back to work.

"(Y/N), I'd like to have a word with you in private" L said, standing up.

"Sure" you say, walking off with him upstairs.

"You almost had me humiliated and you think that's funny?" L asks you.

"A little bit" you shrugged.

"I suspect the chilli sauce in my doughnuts was your doing too huh?"

"Yep."

L then pins you to the wall behind you.

"You like to be a tease, don't you" he said.

"Whoa! Why are you getting so close?!" You ask, your face going bright red.

"Why else would you leave your underwear in my room? You're asking for it, aren't you?" L smirks.

"C-Come on! It was only a prank!" You say. "I was just teasing you!"

"Yes, now it's my turn to tease you."