(This was requested by TotallyNotAvara)
Y/N's POV
'Have you heard? A few girls have gotten murdered...'
'Yeah. None of the student council can figure out who it is! It's so scary!'
'I heard that Lord Diavolo can't even find the culprit! What should we do?'
Whispers filled the hallways, and I tried my best not to laugh or smile, it was super hard though.
"The last girl was boring though. She cried, screamed, and died very quickly. I should've tortured her.
She deserved it after all! She was looking at Him! No one's allowed to even glance His way!
Don't worry Mammon....I'll get rid of all of them. I'll kill anyone who gets in the way of our love..."
I silently walked to class, and the tense atmosphere around me felt blissful. It reminded me of my last kill.
-flashback-
I twirled a knife in my gloved hands, admiring how shiny and new it looked, and how bloody it was about to get.
"W-Where am I?" A small, frightened voice asked me.
"Oh, you're awake sooner than I thought. No matter, you'll be dead in soon enough." I said in an excited tone.
"W-Why-?" I gripped her jaw with my hand, squeezing it.
"Because you looked at Mammon! I saw that look in your eyes! I can't have that, not when we're meant to be together~" I gasped as I spoke, getting happier just by thinking of Him!
"Y-You're crazy! Let me go!" She managed to speak. I started laughing.
"I'll take that as a compliment. Now, be a good girl.....and die! Die! DIE!" I started stabbing her repeatedly.
Her screams were cut off each time I slid the sharp knife into her tender, pale flesh. Her clothes were being dyed red.
Soon, I saw the life drain out of her eyes, which was very satisfying to see, as well as watching the wretch take her last useless breath.
"Don't worry Mammon....I'll be yours soon..."
I tossed the body into a trash bag, and just left it in the small shed I was in. I made sure to get rid of the bloodly knife and clothes.
A few hours later, the corpse was discovered. Of course, no one knew who had killed the "poor" girl.
-flashback over-
3rd POV
Mammon's eyes landed on Y/N, who had just walked into the classroom. Her face was surprisingly calm compared to everyone else.
"Why does she look so calm?! Girls are bein' murdered! What if she's targeted next?
Like THE Great Mammon would let that happen! I-it's like I'm worried for her though.
Hold on! Maybe there's a reason she's so calm. Is it possible that-?"
Mammon couldn't believe the thoughts in his head. Could she be the one murdering the girls?
Well, he wasn't one to judge her. After all, Mammon had done a few dirty deeds as well.
Some male students have been murdered, but Mammon got too scared that Y/N would find out about him, so he had stopped killing a few months ago.
She would hate him forever, and that was the last thing he wanted. Mammon wouldn't dare to kidnap her, or do anything horrible to her.
Y/N sat down, and he could see a faint smile on her face. Mammon decided to follow her after school to see if he was right about her...
Y/N's POV -after school-
I walked over to a girl who had been watching Mammon today. I overheard the soon-to-be corpse saying how hot his is!
"I can't disagree with her, but I'M the only person allowed to think that way about him!"
"H-Hey....do you want to walk home together?" I asked in a nervous tone.
"Why?" She sounded annoyed.
"W-Well, isn't it the smart thing to do? If something happens..." I trailed off to seem chilled at the fact of being murdered.
"Whatever. Fine. Get your shit and hurry up." She snapped. I nodded. I grabbed my things, and we started walking.
"You're so snobby! Mammon would never love someone like you! It would be better if you were dead in a ditch somewhere!"
So we walked a little ways away from the school, and I managed to take her to another abandoned area.
There were no buildings, just a large forest. She had been on her phone the whole time, so she was following me absentmindedly.
"W-Where....are we?" She looked up from her phone, and clutched her phone in anger.
"What the hell do you mean?! You were the one who was supposed to lead us to town!" She yelled.
"I-I didn't mean-" My cheek suddenly stung, but I ignored it.
"Don't give me that shit! I hope you get killed by that murderer!" She turned to walk away, but I grabbed her wrist.
3rd POV
Mammon had been trailing Y/N and some random girl for a while, and now there were in a forest.
The girl started yelling at Y/N, and even slapped her! Mammon was very furious. How dare someone talk to his beloved like that, and have the audacity to slap her?!
He was tempted to go kill her right now, but then something unexpected happened. Y/N turned to the girl, and shoved her against a nearby tree.
"Now now now, don't say anything you'll come to regret. Listen here, Mammon is mine!
I won't let some snobby bitch look at him just for his looks! He's so kind and caring, far more than someone like you deserves!" Y/N started rambling.
Mammon was surprised, but he was oh so happy. Y/N had been the murderer this whole time!
Even better, she loved him! She was doing this all for him, and Mammon had done the same for Y/N.
Mammon watched in delight as his beloved put on gloves, and grabbed the girl's hand.
She forced her hands to stab towards her. The girl was too weak and couldn't fight against Y/N.
Soon, the girl slumped over, and Y/N made it look like the girl had stabbed herself multiple times.
Mammon decided to confront Y/N.
Y/N's POV
I grinned as I looked at my work. I didn't even have to bury the weapon or body this time.
I took off the gloves, and climbed up a tree. I tied the gloves in a hidden area so no one would find them.
When I looked down, I saw Mammon looking at the corpse. My heart ached, and I felt tears in my eyes.
I slowly took another knife from my pocket, and jumped down.
"He won't like me anymore....I need to threaten him. This was the last thing I wanted to do, but in order to be with him, this needed to be done."
I landed in front of him, and held the knife mere centimeters away from his neck.
"Mammon my love! I see you followed me here. If you tell anyone about this...you're going to regret it." I glared at him.
"H-Hey now! Do you really think you're the only one killin' people?" Mammon suddenly pulled a knife on me.
"Mammon! You mean-?"
"Yep! You're lookin' at the culprit for killin' those guys a few months ago. I couldn't stand them!
They kept lookin' at what belonged to me, and me alone." He dropped the knife, and kissed me on the lips.
My chest became warm as I kissed him back. I dropped my knife and wrapped my arms around his neck.
"You're all mine too. So don't look at any other girl but me." I whispered.
"Hey! You're not allowed to look at any other guy, ya here me?" He whispered back.