warnings!: yandere!Nanami ; teen!Nanami ; nanami×reader ; nsfw (not 🌽 but gore and violence / mention of cannibalism) ; death scene ; obsessive Nanami ; jealous Nanami ; toxic Nanami ; not JJK au ; story + headcanons ; AGAIN this is a not very friendly post for sensitive people. you've been warned
1824 words
Being an introverted and highly asocial person since the first years of childhood brings its consequences, and that's something Kento Nanami knows very well. In his short 17 years of life he hasn't even had anything close to a friend, but that's okay, the kids at his school are annoying and stupid anyway.
But the day you, the new student in the class just transferred from another high school, paid attention to him, oh honey, something awakened in him…
If you decide to ignore your classmates' jokes about getting close to Nanami and decide to befriend the boy rejected by everyone thanks to his unfriendly way of being, Nanami won't walk away from you at any time. You are his first friend! How could he stay away from you? Besides, you treat him with the minimum decency a person deserves, that makes him feel special and loved for the first time.
For before Nanami consciously realizes that she has fallen madly in love with you, he starts to, slowly but surely, become obsessed with you…
Yandere Teen!Nanami who has started collecting things you touched or used. That napkin you used to wipe your smeared lipstick, the hair tie you use to tie your hair, a band aid, the gum you chewed, the straw you used to drink bubble tea....
Yandere Teen!Nanami who makes you company while going home just to find out where you live.
Yandere Teen!Nanami at night she will spy on you by watching you through your window while you walk around your room, change your clothes, do your homework and even when you decide to indulge your most lustful desires while alone.
Yandere Teen!Nanami will take any opportunity to touch you, be it your hair, hand, cheeks. Whether it's accidental or if you hug him.
Yandere Teen!Nanami who likes your scent and will offer to wear your jacket when you are tired, just so that when you don't see him he can smell it. He also gently approaches you to fill his nostrils with the scent of your perfume from your neck or the shampoo in your hair.
Yandere Teen!Nanami who likes to spend time with you, secretly recording your voice and editing it later only to hear you say his name.
Yandere Teen!Nanami takes pictures of you from every angle, even your panties, and has all his bedroom with the walls full of photos of you like wallpaper.
Yandere Teen!Nanami who keeps videos of you in his laptop and watches them when he's alone. He specifically uses the most suggestive ones to play with himself.
Yandere Teen!Nanami who feels sickeningly upset when you talk with your other classmates. Why spend time with people who have made his life hell? What if they put ideas in your head about him? What if you start to pull away? Nanami doesn't want to lose you.
Yandere Teen!Nanami could start trying to isolate you when he feels that you're getting away from him, although that's only something that he feels.
Yandere Teen!Nanami will go crazy if he confesses to you and you reject him. No matter if you think about him as a friend, or as a brother, or as a classmate. Nanami will go crazy to the point of hurting you and hurting himself.
On the other hand, if you decide to accept him and you start dating… Well, you better be ready.
Yandere Teen!Nanami as your boyfriend will be very clingy and touch starved. He will touch you more than before and won't even ask for permission, after all, he's your boyfriend.
Yandere Teen!Nanami is gonna try to convince you to live with him and you better accept it, for your own good.
At this point you're probably starting to realize that he's getting weird with you. — "Don't be silly, I'm just trying my best to be a good boyfriend for you".
Yandere Teen!Nanami will expose you to graphic gore content (videos, photos, books, mangas) just to make you like that content as much as he does.
Yandere Teen!Nanami is starting to lose his sanity, all because you are getting along too well with your friend.
Yandere Teen!Nanami who feels sick and desperate when he notices that you're spending more time with your friend than him. He knows that you're starting to get away from him.
— "I just… I don't know, it doesn't feel right anymore. I kinda want to break up with him now". You were talking to your friend and Nanami overheard the conversation. Are you really considering breaking up with him?
Yandere Teen!Nanami will spend whole nights crying and panicking all because of what you said to your friend. His first and only love is trying to leave him, like everyone does.
Yandere Teen!Nanami who had enough and can't bear the fact that you want to leave him, to abandon him. Nanami simply doesn't want to be alone anymore, it hurts, it really hurts him.
Yandere Teen!Nanami will invite you to a date to fix all the problems in your relationship. Of course, you accept thinking that he realized how wrong he was the whole time.
Nanami takes you for a walk around Tokyo, treating him like his savior. You have ice cream together, hold hands, laugh together and even kiss.
Nanami tells you that he has a surprise for you. — "Could you like to see it?". Are you really going to refuse now that your boyfriend seems to be changing for the better? Absolutely no.
Nanami takes you to a neighborhood near the outskirts of the city, he takes you to a house, a nice house. — "A neighbor of mine asked me to take care of his house while he's abroad". Nanami takes you inside. The house is a bit empty for being the house of a neighbor of his. You start feeling unwell.
Nanami holds you from behind to start kissing you. — "Kento… Can we just leave? I wanna go back home…". Oh dear, how do I tell you this?
You're doomed.
Nanami takes a rope and wraps it around your neck to keep you still. — "Darling… please. I don't want you to leave…".
He turns you around to kiss you but you start to push him away. Who might believe that your boyfriend would be able to do something like this. You can feel your heartbeat beating faster as your anxiety starts rising up, this must be a joke, right? Unfortunately no.
Nanami tighten the grip of the rope on your neck, depriving you from breathing. — "You don't get it… You don't. You're my world, I can't be happy if I see you flirting and laughing with others". You can tell the pain and rage in his voice as he talks to you, holding you tighter, taking all possibility from you to escape. — "You're mine, darling".
No matter how much you fight or beg, Nanami wants to keep you there, captivating. This could be easy for you, this could have been so easy but you decided to condemn yourself by simply saying: — "I hate you…" You… hate him?
Nanami opens his eyes wide, he can't believe what you said… But surprisingly he looks pretty chill… suspiciously chill.
Nanami stays in silence, thinking about what you said and all that he has done. — "... It's okay, darling". He smiles at you, gently and calmly as he holds your face with one of his hands. He drops the rope and caresses your neck and the marks the rope left.
— "Darling…". He kisses you softly, not caring about your fear or disgust. — "If I can't have you, no one can".
Before you can even react, Nanami is already strangling you. His warm hands holding your neck in a deadly grip. You can see his eyes full of resentment and desire.
Not satisfied enough and in a trance of anger and jealousy, Nanami stamps your head against the wall violently. You feel the stinging throb on the back of your head, it makes you feel dizzy and numb. But it doesn't stop there, Nanami keeps banging your head against the wall, all while his hands are still strangling you.
The commission is immense, immeasurable to the point you can't even think about fighting and escaping. You're completely petrified. Nanami seems to be possessed by something or someone that is blinding his reason and your own pain.
The minutes keep passing and your boyfriend is beating you to death. The pain isn't unbeatable anymore, it's even comforting now that you realize this is the end and you won't escape.
You think about your family, about your friends, about the warnings that your classmates made about him but you decided to ignore. You think about your life, a short one but full of nice moments that you maybe didn't appreciate enough. You think about all your struggles, triumphs, goals and dreams.
You start feeling extremely tired, just like if you were about to faint. In your last moments of life, you apologize, in your mind, to your family and friends for not being able to go home ever again…
Even when your body succumbs, Nanami doesn't stop hurting you until some minutes after when he snaps out. He just killed you with his bare hands. — "Wha… What?... Darling?". The blonde guy is in a state of shock when your body falls inert to the floor. How could that possibly happen? He doesn't remember using so much strength, he wasn't even hitting you so hard… Why is there blood on the wall and a hole on your head?
He killed you.
He's a monster, no. He was protecting you, yes. Absolutely yes. He was protecting you from the people that hurt him and was trying to take you away from him, now no one will ever touch you again. It was an act of love and because he loves you so much he's going to bear all your sins in him
Next morning Nanami woke up in that house, brushed his teeth, washed his face and went to the kitchen to make himself a sandwich for breakfast.
Today's breakfast is a sandwich, a roast beef and cheese sandwich.
— "I will always love you, you know?" Nanami was talking alone and eating his sandwich with a pleased smile. — "I know it will take some days but that's how commitment is. Just like marriage where we become one with each other…"
Nanami peacefully eats his sandwich slowly, taking note of all the flavors and sensations he's having. It's delightful, fulfilling. After finishing his sandwich he thanks his love for everything, for making him happy. Then his expression darkens and he looks for a second at the fridge to then look once more at the empty plate.
— "So this is how you taste, darling…"
it took me fuckin forever! *sweats* not sure if im gonna post something this explicit of dark for a time 🫠 it was hard to write. thanks god our real nanamin is just an emo boi ‹𝟹
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