Background of story:
You joined the Karasuno volleyball team as their manager and you love your position. Everything seems fine ever since the first day you were there - or is it? Everything's fine until that day someone from the basketball club confesses to you and you accept it. No one notices the Yamaguchi with a crooked expression behind both of you...
YANDERE! YAMAGUCHI CAUTION
WARNING: CONTAINS CONTENT ABOUT KIDNAPPING, MIND-BREAKING, SOME VIOLENT CONTENT AS WELL AS VERY SLIGHT SEXUAL CONTENT
IF YOU FEEL UNCOMFORTABLE WITH THE ABOVE CONTENT, RETREAT.
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Yamaguchi's perspective (third person)
He felt his blood boiling while he bit his lips seeing such as scene - (random name) confessing to you, despite the fact that he already had so many more fan girls. Why her? He felt his heart ached and his brain throbbed while the annoying ring vibrating in his ears - he heard the evil him buried deep inside his mind struggled to get out, screaming in pain, in greed,
"KILL. KILL. SHE BELONGS TO ME. I KNOW I COULD TREAT HER SO MUCH BETTER THAN HE DOES. KILL. KILL. KILL..."
Eyes narrowed, Yamaguchi turned around and walked away with a revengeful smirk. He felt his fingers digging deep into his palm, though he didn't care - the feeling of losing you was by far the most painful thing he had experienced - or shall he say, you broke him.
Hiding a small syringe with a bottle of tranquilizer in his bag, he giggled cheerfully, feeling happy that you would soon be his property - soon. Before that... he would need some more evidence about THAT.
Your perspective (second point of view)
In the morning, you saw the figure of (random name) in front of your house, waiting for you to go to school together. It's been more than a month since you dated (random name. He sure's a big flirt, you admitted. However, that day he just seemed so real, you could even see his love for you in his eyes. His words were covered in honey - sweet, submissive and addicting.
Drowning in his compliments, both of you walked to school together holding hands. You must had done a million of good things in your previous life to have him by your side now. Leaving his classroom, Class 1-4, the college preparation class, you didn't notice a certain male staring at you longingly with hunger written all over his huge smirk.
-after school-
Since you were from a not so good class, so you were released early as the teacher didn't really care anyways. You waited outside (random name)'s class patiently while blushing, thinking that he would come to the volleyball practice together.
"DRINGGGGG" immediately after you heard the bell ring, you galloped into his class.
"(Random name), let's go to..." if you had a tail, it would be shaking from side to side massively.
"Ah I'm sorry (F/N)-chan! I just remembered that I have something important to do in the basketball club!" he bowed at you, looking apologetic.
"O-okay..." this isn't the first time he had something "important" to do in his club - it's not that you're being difficult, but as you know, he wasn't even a regular player in the team...
He patted you slightly on your head and pulled you into a short, but passionate kiss, "I promise, next time. I'm just working on something, babe."
You blushed, throwing all your suspicions away, "Okay! I understand! Next time, then!"
Just right after him and everyone else went away, Yamaguchi approached you with a harmless smile, as always, on his face. Maybe it's just you being extra sensitive, but something seemed off about him today - nah, maybe because your period just ended.
"Ne... (F/N)-chan..." you saw sparkles in his eyes - but only for a very brief moment. Shocked, your eyes widened a little, he had never called you by your first name; neither had he called you a "chan" before.
"Did you know that..." he leaned in and whispered softly, "(Random name) has someone important to do in his gym room - that someone isn't anyone bu your bestie, (F/N)-chan."
You pushed him away harshly as you felt sharp bite on your earlobe, "No way! (Best friend) will never do that! What has gotten into you lately, Yamaguchi?! You're creeping me out, gosh!"
They smile on his face slowly turned upside down into a frown - though full of wrath. He stretched his hands to your throat and held them tightly, eyes looking straight into yours, as if he was trying to engulf your soul.
"ME!? CREEP!? BITCH YOU BETTER KNOW YOUR PLACE!" his grip on your throat got tighter that you were almost suffocated.
Out of a sudden, he released his hands, making you collapsed on the ground while gasping for air. You glared at him, not able to speak yet, and coughed pathetically, he would say. Before you had the energy to stand up and debate with him, you saw Yamaguchi with a syringe, getting some fluid from a small bottle.
Panting for air, you tried opening your mouth to say something. Then, you lost consciousness - the last thing you remembered was him injecting the fluid into your neck.
-After a while-
You felt weak; in fact, you could feel your movements being restricted by the thick ropes. You opened your eyes slowly, and saw yourself in Yamaguchi's unfamiliar embrace. You tried resisting - all in vain. He grabbed your chin, having you to realize that you had a cloth stuff in your mouth, so any attempts to cry for help would too be in vain. He then forced you to look straight into a small hole in a wall.
"Y-yes! Right there (random name)! M-more! Ahhh, feels goood! Do me like you'll never that (F/N) bitch!" dirty moans from your (best friend) were suddenly audible to you.
"I-I'm cumming!" seeing your boy friend thrusting into your best friend made you sick.
"See... Told you..." you tried looking away but was forced to look at them again.
"Look at them cum... Sick, right?" he whispered in your ear while pointing a pair of scissors at your throat.
You nodded weakly and closed your eyes, trying to shut yourself down. But nope, Yamaguchi wouldn't let you. He stabbed your palm with the scissors, making you jolt in pain. You saw his eyes twitching and tears dripping down. To prevent you from making any sound, he covered your mouth with his hand just in case the cloth wasn't strong enough.
"You bitch... I want you too look at them... They're screaming disgustingly in pleasure and you... Enduring pain all alone. No one wants you, no one needs you - you're nothing but an idiot being toyed by him." he turned you around, forcing eye contact with you without stopping his action to stab your palm.
You humped as tears flooded out of you. You shook your head, denying the fact that your boyfriend cheated on you with your best friend. You just simply couldn't accept this fact; the pain caused by being stabbed was so much more bearable than that.
"You know how I feel now? When you accepted his confession?" he smirked, pulling out the knife out and licked your blood on it.
"Hey... (F/N)-chan... you hear me?" he caressed your cheeks lovingly, at the same time scarily, leaving blood on your face.
You simply nodded lifelessly, you were broken by the harmless, innocent man in front of you. You didn't struggle as much anymore.
"(F/N)..." he took out a tablet with a headphone plugged in. You looked at him weakly, not even bothering to think anymore.
"For the past few weeks, I have been recording your boy- ah my bad, your ex-boyfriend having sex with (best friend). In the restroom, in the gym... on your table." he glanced at you with a smirk.
You shakily shook your head, backing away from him. No way, no way! He bridal carried you and brought you to a long-abandoned store room in the school. He proceeded to dump you inside a dark, quiet cabinet. He then forced you to put on the headphones as he started the playlist full of (random name) and (best friend)'s porn.
You humped, shaking your head, trying to shake the headphone to avoid hearing any disgusting moans in pleasure. You then received another stab in your thigh. You yelped and stopped moving while looking at him in fear.
"That's it. You will be staying here until I'm not mad anymore." cruelly, he shut the cabinet door and stomped away from the store room.
-one day later-
You shivered with tears non-stop dripping from your eyes. Your eyes were sore - you had been crying since Yamaguchi left you in this narrow, dark cabinet with this tablet that wouldn't stop replaying the playlist of disgusting porno as well as the headphone that wouldn't stop delivering the dirty moans of theirs.
You were hungry and thirsty - you had no clue how much time had passed. You hadn't seen any light other than the screen-
"(F/N)-chan~~ I'm not mad anymore~~" the familiar voice.
You humped excitedly and bumped yourself at the cabinet eagerly. The moment you saw his face you started crying. And when he released the ropes he tied around you and turned of the tablet, you hugged him tightly, not wanting to let go at all while sobbing like you were running out of breath.
"There~ There~" he patted your back gently, the smirk on his face grew bigger.
"Take this, you hate THEM, don't you?" he then passed you a thumb drive, both of you knew that THEIR porno's inside.
You shakily received the thumb drive and nodded without hesitation.
"Good. My slave..." you saw him smile while you were pulled into a hug. You closed your eyes, enjoying all the pats you're receiving from your master.
-few days later-
"HAVE YOU SEEN THIS? (RANDOM NAME) AND (BEST FRIEND) HAD SEX EVERYWHERE IN THE SCHOOL! HERE'S ALL THE VIDEOS!" Yamaguchi made many copies of their porno and was giving them to everyone for free.
"(RANDOM NAME) IS A DIRTY CHEATER AND (BEST FRIEND) IS A LYING SLUT!" seeing the two trying to explain but all in vain, Yamaguchi's smirk spread wide across his face.
"H-haven't Yamaguchi gotten a little weird lately?" Tanaka seemed frightened.
"Maybe because his crush had gone missing for a few days now..." looking concerned, Tsukkishima too felt that Yamaguchi was further and further away from him.
After school that day, he went to an abandoned house far away from the school.
"Master?" your neck chained to a nearby pillar, you happily welcomed Yamaguchi.
He patted your head as you purred under his gentle pats.
"Your parents went to the two - their lives are-" he grabbed your chin and leaned in.
"RUINED AND BROKEN!" both of you said in unison and drowned in a deep, passionate kiss. You were happy to have Yamaguchi by your side - you must had done a million good things in your previous life to deserve someone like him that will never look at the others...
Or is it?
-few weeks later-
"H-hi! M-my name is Yachi Hitoka! T-the new manager!" Yachi bowed at the team.
"Cute..." a feeling that Yamaguchi had never felt grew in his heart.