Hc: anyone can be pushed to murder if put under enough stress. Something you knew all to well.

AU: yandere reader

The knife gleamed in the moonlight that shone through the window, holding it in your gloved hands. You couldn't take this any more. The torture, the pain, the fear. If you didn't get rid of Light, L would die. L being the only person you had left, you weren't letting that happen.

Taskforce was huge, and with how far out the rooms were spaced, you could do what you had to do without being caught. If you were good enough. But you knew it'd be easier to get him out of the building first. Your blood boiled whenever you saw him, that pathetic excuse of a human, how disappointed his father would be if he actually found out he was really Kira the whole time. The world was better off without him. Of course you knew it was wrong, but sometimes push came to shove. If anyone in the worlds deserved death, it was him.

Having lured your victim out of the building with selectively placing a flashing light outside his window, your plan set into action. Sometimes the security lights would go off at random times, and it's wake anyone in close proximity. The only off switch was either through L's computer or outside in the security systems box. And just as you thought, Light got annoyed by the flashing and decided to go turn it off. He walked out that front door not knowing his reign ended then and there. As he fiddled with the switches to turn the security lights off, you felt yourself start to loose control as rage began to take over. Just knowing what he'd do to L was enough for you to spiral.

Noticing a presence behind him, he turned to face you.

"(Y/n)? Was it annoying you too?"

You didn't respond, but a horrifying giggle left your throat.

"Do you have any idea... ANY IDEA- what you've taken from me?" You seethed.

"(Y/n) what are you on about?" He replied.

"I know what you are, I know what you're doing! YOU THINK I'M JUST GOING TO STAND BY AND LET SOME GOD COMPLEX LOSER TAKE THE ONLY PERSON I HAVE LEFT FROM ME?!" You exclaimed.

He seemed to catch on now, realising this was a confrontation.

"This again? I'm not kira! Get that through your head!"

"I know, I know, I know, I know what you are. And I won't let you take my last reason to live. YOU WON'T GET HIM!"

Lunging are him, the fight began. He was taller than you, but you had the strength of 1000 soldiers when it came to protecting L. He stopped your arms, grabbing you by the wrists and trying to push you off. You slammed him against the wall, causing him to weaken. But he persisted.

"JUST FUCKING DIE!"

"IF YOU DO THIS YOU'RE NO BETTER THAN ME!"

"Don't you DARE compare me to you. YOU KILLED THOUSANDS! I'm trying to do everyone a favour"

Finally you managed to break from his grip and you swung the knife at him, slashing him in the neck. He dropped to the ground, screaming in pain and you kicked him onto his back. Plunging the knife into his chest and finally putting an end to the suckers life. You stood up, catching your breath and looking down at the now dead body. Your bloody hands and knife. You had a plan to cover this up as well.

Once you had your breath back, you quickly piled his body into an empty instrument case you'd bought just for this occasion. Strapping it to the back of one of the taskforce police bikes you zoomed off to a place where murder wouldn't be the first thought. The suicide Forrest. That's where you dumped the body, making sure to place the knife in his hand to make it look like a suicide.

Then going for the nearest body of water to dump the weapon and box. It took a few hours to get all this done, but when you made it back to taskforce you only had one more job. Clean up yourself. Since it was the dead of night, no one could see the blood on your sleeves as they slept, the cameras wouldn't pick it up either. Not that it mattered as you'd put some fake footage into the time slots earlier. So you took a shower, a long one ams made sure everything was gone. And lastly you had to burn your clothes and the gloves.

You crept into the room you and L shared, finding him still sound asleep in bed. Poking at the slowly burning out fireplace, you got the flame going again, dumping your clothes and watching them wither away.

"(Y/n)?"

You turned to see a sleepy L had figured out you weren't in the bed next to him.

"Why'd you get up? Come back..."

"I got cold, wanted to make sure the fire would burn though the night" you relied, walking over and crawling into bed next to him.

He wrapped his limbs around you, clinging to you like a starfish. Seeking the warmth you'd collected by the fire.

"You need some sleep, I'm staying here ok?" You said.

"Ok, I love you" L yawned.

"I love you too... I'll always protect you whatever it takes"