What to do? LxReader [Discontinued]

"L! I got us some cake! Do you want to eat it now?"

You yelled right as you entered the house, not expecting L to yell something back. You walked to his room to hear his answer.

"Yes, I would love some."

"I'll see you in the living room then."

You said back as you walked into the kitchen to cut the cake. You cut the cake in four pieces and put two of them on plates. As you turned your back toward the kitchen you could see L get out of his room. He went to sit down on the couch in his usual manner.

"L, the sugar is already on the table, but would you like some tea with it?"

You said jokingly as you put down the cake.

"Yes, and some milk please."

You laughed and went back to the kitchen to get two cups of tea and a little bit of milk. You knew L liked putting in the sugar cubes himself, so you just put the tea with milk in font of him and sat down next to him. You started eating your cake.

It had been like this for a while now, on the days that not much happened, the two of you  just solved cases and eat cake together, the only thing that had changed was that L now sat down next to you on the couch instead of on the chair. You enjoyed these type of days and they were a lot of fun.

After both of you had finished your cake and the dishes were done L went back to his pc,  you followed back into the room where he just came from. Your pc was in the same room and you started playing  video games. You didn't really feel like starting a new case after the last one, and there were no new requests yet, so you had a small break.
After a few minutes of silence L spoke;

"(Y/N), do you know Near?"

"Near?"

You thought about it for a bit.

"No, It doesn't ring a bell. Should it?"

"No, perhaps not. He's someone from Wammy's."

"Why did you bring him up now?"

You asked moving your chair over to his. He was staring at his screen with his thumb to his lip. On his screen was a type of messenger system, to the left were letters and to the right the message. The message currently opened was from 'N'.

"This was send at twelve o'clock today."

You read the mail. It was very short and didn't beat around the bush.

L,

Criminals have started dying by heart attacks again.

N.

"Does this mean...."

"Yes, Kira has returned."

"But Light is gone! He died in prison less than three days after he was put in one."

"The probability of it being an impersonator is very high. More than 90%. We should move on the assumption that this is the fifth Kira."

Your brain began to work again. Your break had left you slightly bored, you wouldn't go as far as to say this was a good thing, but it certainly was more amusing than sitting behind your pc.
L started typing an e-mail to N. 

N,

Thank you for informing me. 
Please notify me if you find anything else.

L.

"What do we do now?"

"We wait, researching ourselves would just mean we're doing unneeded work. I'll go back to my case. Oh, (Y/N) could you help me with this. I need a motive for this crime, but no matter where I look I can't find one."

"L, have you tried putting yourself in that persons shoes yet?"

"In a literal sense, no, this person has smaller feet than I do and I generally dislike wearing shoes, in a figurative sense, yes, I have but it did not help me in the slightest."

You looked at the case, it was quite simple, you did not see why he was having trouble with this, or why he was even working on this to be begin with. 
No matter how you looked at the case, the motive was jealousy. The murder killed the person his lover was having an affair with. Quite a Yandere move if you said so yourself. 
You guessed it was, in a way,  good that L couldn't find a reason.

"Maybe if you-"

You started, but were soon cut off by the pc making a soft beeping sound. L went back to the messenger program and clicked on the newest message. 

L, 

Sakura TV has received a tape from someone claiming to be the fifth Kira.
It is currently being aired. I will ask Watari to send you a full copy later. 

N.

You ran towards the television and turned it to Sakura TV.
On the screen was a 'K' in the Cloister Black type face. It seems the message was nearing it's end.

"At last I would like to call out to L, the person who captured my predecessor."

L slowly joined you and moved next to you.

"I know that, if anyone, you are the person who knows about the Death Note, thus I will not hide the fact that my way of murder is the same as my predecessor's. I kill people using the Death Note and I also have a Shinigami following me. I am the new Kira this world needs. I hereby invite you to go up against Kira once again, not as a ghost of the past, but as a new, smarter, stronger person than the one he used to be. I will carry on the will of my predecessors and I will carry out JUSTICE!"

You looked over at L and noticed the look on his face. His eyes were bigger than they had ever been before and the corners of his mouth curled slightly upwards. He looked like he was having fun.

"I will go against you once more Kira,"

He stated. His head tilted down slightly, his hair covering his eyes.

"but this time I  will prevail."

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(A/N) Yaaaaaay, Story ideas! They come from the most unexpected, or expected, things.
Anyway, I'm happy to have some kind of plot laid out for this, even though it's going to be difficult to work out. So, that's where the author's note stops, after this is just empty page. Huh, That's....pretty lonely....