This is my first time writing here, hopefully i didn't do too bad ^^. I took some liberties with the plot, but since it's been a while i don't think it's a problem. Enjoy and lmk how to improve!

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You are alone in your house watching television, just a night like any other, when the doorbell rings. You are surprised, as it is really late and you aren't expecting any visit. You get up from the couch and answer the door.
Your heart skips a beat as you open the door to find Yukako, a girl you snuffed some months ago, still alive for some reason. You two had matched on a dating app, then went on some dates together. Things moved fast between you and soon enough you were fucking her in your car. You got too excited... her unconditional attraction towards you made it too easy. You had convinced her to try asphyxiation, but you got carried away and found yourself with a dead body. You fucked her for at least half an hour before realising she was really gone. You weren't planning to go that far (even though you definitely enjoyed it), so you did what you could and dumped her into a river.
You cannot believe she survived. Your mind starts rushing to the worst possible scenarios, you thought you were safe, you eliminated all proof of contact between you and Yukako, you deleted the conversations and even the dating app. With no witness, they won't even consider me as a possible suspect, you thought. But now the only possible witness was standing there right in front of you.
Also, why is she appearing only now? It's been two months since the accident, the police should have come far earlier than her. She still had scars on the neck caused by the strangling, what could have stopped her from reporting you?
You get more and more anxious as these thoughts fill your mind. You stand there in silence, sacrificing all common courtesies, clearly unneeded in such an encounter.
Yukako has also been standing in silence since you answered. She seems anxious too, her eyes looking down, not able to catch your stare. After half a minute she unfreezes and her right hand reaches towards yours. You are too scared to do anything, so you let her guide your hand, which she places right on her neck. You can feel the scars under your fingertips, feeling ever more scared about the consequences you might suffer. However, you don’t sense danger from her, she doesn't seem angry or resentful, on the contrary, you make out some sort of anticipation, but the fear in you is too strong for you to make a move. Fortunately, Yukako is the one to complete the act, guiding your thumb around her neck. You notice how your hand matches the scars on the neck, feeling a tingle inside along this realisation.
Yukako is blushing more and more with each move, but finally she gathers up the courage to open her mouth.
"Pl- please... let's reenact that night".
Her words shake you awake. She isn't here for revenge, all the opposite…
"S-sorry...?" You blabber.
"Let's reenact that night!" Yukako bursts out, even redder than before.
"Is this a set-up? Are there officers waiting for me behind the fence? Why do you just show up randomly at my house?!"
"It really isn't... I'm being sincere, I want you to do it again..." Yukako starts caressing the hand on her neck, gently touching with the top of her fingers the scars beside it. She looks up and you finally catch her stare, overflowing with love and devotion.
"Really...? Aren't you mad? Why didn't you report me to the police?"
"I thought about it... many times... but I couldn't help myself...", her free hand instinctively went to her private parts, "…every time I tried to recount the events, in order to have a coherent story... I just couldn't stop the excitement! I started masturbating and couldn't stop for hours." Her hands move faster as she explains and her stare falls deeper and deeper into your eyes. "I thought about you so much in those months... I dropped out of school because the thoughts were too frequent and intense. I forgot I wanted revenge, I forgot about going to the police, but I didn't forget about you... I searched for all the information available and found your address, and finally, FINALLY, after all this time I am here outside your house!" As she talks, you notice her breath get more intense, her legs dripping more and more…
''Asphyxiation really fucked up her brain'', you think to yourself. ''But oh well, better for me, and better to shut that mouth for real this time, not mentioning it would be a waste to refute such a piece of a girl''. "I see... well, who am I to deny such a desired request from you. You want to come inside?"
Yukako's pupils widen, she immediately throws herself into your arms, her plump chest pushing onto yours. "I was really worried you would not accept this, I'm all fucked up now, with those scars... I was worried no one would look at me anymore... But you never disappoint me!" She is hugging you with the same strength one would cling to life, and you hug her back, knowing you will soon take this strength. It's only your second time snuffing someone, but you are at least as excited as her.
You put your hands on her ass, its softness surrounding your fingers. Then you lift her up, her legs now going around your torso, her neck inches away from your eyes. You can't control yourself and kiss the scars, her body flinching in response. You continue and give a small bite, causing a gentle shiver to run from her neck to her pussy. ''She really became a snuff slut, huh''.
You close the door and take her upstairs, Yukako still clinging to you. As you enter the bedroom, you let your grasp go, dropping her on the floor. She looks up at you still with the same dreamy eyes.
"You wanted to reenact, right? Well, demonstrate you really want it, I want to see you beg for it."
Yukako immediately understands, her gaze goes down to your pants as she gets on her knees in front of you. She starts kissing through the fabric as she delicately unbuttons your pants, letting your cock out. She gazes at it with a stare of devotion... her beloved cock, the one that took her virginity, the one she fantasized about for so long, the one that hopefully will take her life tonight. Finally, it's in front of her!
She starts sucking your cock like she worships it, twirling her tongue and taking it deep inside her throat. She uses her hands to guide yours to the back of her head, a clear invitation. You take it and push her head down as much as you can. Yukako gags on your cock, your pubic hair invading her face, your glans hitting her already fucked up throat.
You grip her hair and push her head up and down your cock without a care, like you’d do with a onahole. She doesn't seem to care either, as she seems more focused on her tongue movements than her air inflow.
You won't kill her with a blowjob, that'd be a waste. After a few minutes of asphyxiation, you take your cock out and let her breath, her saliva still connecting her mouth to your groin. She gasps for air, tears running down her eyes, but she gathers the force to talk: "Please... *gasps* go all the way this time, *gasps* I'm begging you *gasps*, kill me!"
"Aren't you forgetting something?"
"Yes Sir, please kill me Sir *gasps*... I give up my body and my rights and offer them to you." Her lower body quivers gently as she says this.
"Good girl", you smirk, as you drag her by the hair to your bed. "Now tell me, how would you like to go out?"
She takes off her top, revealing no bra and just a loose noose going around her neck. She looks up at you longingly as she answers: "Please tighten it as you fill me with your cum~..."
"We already did plenty of asphyxiation! I'm getting bored!" You instinctively slap her out of frustration, surprising even yourself. It doesn’t seem to matter though, as Yukako starts to drip even more, staring at you in admiration. You go into the kitchen and take a meat cleaver. "I'll grant you asphyxiation, but you'll go out as I wish!"
At the sight of the knife, her eyes fill with fear, along with her ever present devotion. She drops to your shoes and starts kissing them out of gratitude "Yes Sir, thank you for striking me and allowing me to die by your desires, Sir~!"
You lift her up by the hair and throw her stomach up on your bed. You depose the meat cleaver and finish stripping her. Removing her skirt and drenched panties leaves her with only a noose on her, a sight which really excites you.
You impale her pussy with your dick, Yukako immediately letting out a moan and shaking her legs. You don't let her rest and immediately start thrusting with all your might, too aroused to control yourself. She reaches for you with her arms, so you lean forward into a mating press. Your whole bodyweight is pushing down on her, constraining her as you get into a sloppy kiss. She clings to you, inviting you to get closer and push even more into her. You crush her with your body as you go deeper, and once again you take the opportunity to bite her scars. Her body whimpers each time you do it, her moans get louder and louder, her arms squeeze you more and more. You use your tongue to lick around her neck, delineating where the noose will go, as you start to tighten.
Then, you whisper into her ear "Any last words before I cut your airflow?"
You feel her pussy clench in response, and she mutters through the moans "Thank you *ah*... Sir *ah*... Please take my life, you deserve it~".
You think those to be good last words, and you swiftly tighten the rope causing one last moan to leave her mouth. You lift yourself up to admire the scene before you. Yukako, completely helpless, her airways blocked by a rope firmly held by your left hand, her hands away from the rope, without a hint of survival instinct, instead focused on pleasuring herself on the nipples and clitoris, your cock still drilling into her hole with all your force. It is quite a sight, but it could get better. You use your free hand to slap her, hitting her harder and harder, each slap answered with a tighter and tighter pussy. You stop only when your hand shows up on her face in a purple colour. Satisfied with the bruise, you move on to her right tit, digging your nails into it and lifting her torso up by it. This causes the rope to get looser, giving her some time to breath. You quickly let go making her fall onto the noose, suddenly cutting her air, and you immediately punch down on her tit. The sounds make you think you fractured some ribs, not that it matters as she doesn’t need her lungs anymore. Now you take the left tit, lifting her up again, letting her take air for half a second before dropping her again. You punch the left tit, its chubbiness welcoming your knuckles, before starting all over again. You find this game quite amusing, and you think she does too, as she gets her hands on your arm, caressing it with all the life that still is in her. You let her breath once in a while and continue torturing her torso: punching, slapping, scratching, on the tits, on her abdomen. She whimpers each time you do it, her body shivers, her tongue falls out, her eyes fall deeper into your stare, her hole gets tighter with each abuse. You are starting to think that you like this masterpiece, perhaps you'll conserve her body once you are finished.
After you are satisfied with all the scars, bruises and injuries, you lift the meat cleaver into the air. "I think you've had a good run, Yukako, what do you say?"
She moves her head up and down, her eyes widened, her hole madly tight. Her hands go immediately to her vagina, pleasuring her clitoris to get tighter. ''She's so cute'', you think to yourself, ''worrying about my pleasure even in her last moments''.
You pull the rope tighter with your left hand. The asphyxiation, the excitement and her effort cause her to be extremely tight, you can feel her hugging your cock with all her life. All of her, there just for you, just for your excitement, just for this one moment!
"Goodbye, Yukako." You drop the blade on her neck, severing her head in one clean swing. Blood gushes out on your bed as you unload hot semen inside of her, the last warmth she’ll ever feel. You slowly watch the life leave her eyes as you continue pumping, her hole still tight.
You take her head up by the hair and kiss her gently, you almost feel still a reaction in her lips... You take your cock out and impale her oesophagus with it, your cock head hugged by her soft lips. You search for her phone and contact list... ''Hopefully, she has some friends...''

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Name: Marin
Age: 19
Appearance: See the picture
Traits: Wary, distrutful, introverted, secretly a huge snuff slut. She goes to bed every night fantasizing about getting snuffed, but she would never easily admit it.
Characteristics: She is a social outcast, her only friend is Yukako.
Setting: Searching through Yukako's contact list, you discover Marin is the only one who got close to her after she dropped out. Yukako opened up to her about the accident, but Marin didn't tell anyone to respect Yukako's wishes. She secretly fantasize about the story Yukako told her, trying asphyxiation on herself to see how it feels. Yukako didn't tell her she found you, but her disappereance could be suspicious. You decide it would be best to snuff her too. You have access to Yukako's phone, you may impersonate her or trick some other way. Maybe also sending threath photos would work on such a degenerate. It's up to you how to get in contact to Marin in order to snuff her.