Demon slayer people w/ arachnophobic s/o
you scream for help and they eat through the door just to check on you, the most amazing person they know squished in a corner with a mother spider with babies riding on her back on the floor a few feet away from you.
as soon as he comes through the door ready to kick someones ass and then he sees you point the insect out he drops his weapons and scoops the fam up with his dirty hands and pops all of them in his mouth like a grape
so your just standing there watching him mercilessly swallow a whole family of spiders like,,, omg???? bro????
after the most horrifying 20 seconds of your life, he stands up, looks at you, and opens his hand up to your face where mangled dead spiders pool in between his fingers and palm, and he smiles at you, black legs dangling out of his red stained teeth.
will be vry offended if u dont accept his offering of love
So after making him wash his hands and mouth for the first time in his life, you shakily explain to him your undying fear of spiders and at first he's like "wtf?? they're so easy to kill why are you scared of them????"
but after seeing how deeply you fear them and putting some thought into it, he tries to make you feel more comfy.
Instead of eating spiders, (inosuke thinks that he should be able to put anything he wants into his mouth but complies anyway🙄 ✋) he just kinda, roughly grabs them and chucks it into the forest.
He genuinely tries to be supportive but sometimes gets annoyed of how scared you get but he loves you anyway and works with you and your fears.
10/10 your little feral spider murderer 🥰
He grew up in a area where critters and insects are very common, and being the eldest sibling he was usually the one removing them from his house, or showing off cool harmless spiders to his siblings to pet; therefore he's very comfortable handling them.
He could smell your pants shitting terror from a mile away, and he quickly rushes to you, anxiously yelling your name until he breaks into your room, seeing you squat in the corner holding a rock that quivered in your hands.
Then he sees the spider family vibing in the middle of the floor.
quickly connects your fear to the little dude and he quickly scoops the lil guys in his hands, gives you a reassuring glance, and rushes out to gently release the mama and her babies on a tree or plant outside.
comes back and makes you food or just rubs your back until you feel comfortable talking.
After everything calms down, he asks you about your fears and is genuinely curious to why your scared of spiders on sight.
He nods in understanding, and tells you that if a spider shows up again, just call for him.
After that day, he starts informing you about spiders and what they do and how they act, hate and fear usually come from misunderstanding, and he wants to help you out.
he'll encourage you to face your fears and basically gives you therapy.
He'll go on walks in the forest with you and point out different insects and creatures, and if you feeling up to it, he'll put one on your arm or hand and let you get accustomed to the creature, and, eventually he hopes, spiders.
it doesn't even have to be a real spider if its a black small object that moves hes having a mental breakdown no objections
They're icky and gross and it makes Zenitsu want tear off his skin whenever he sees those little legs squirm across the floor.
SO when he comes running to the room to make sure your okay, every single organ in his body stops functioning as soon as he sees the spider.
he makes eye contact with you across the room, he's silently screaming your silently panicking, the spider is making a cute web between the floorboards you need to go to the bathroom its all a mess.
you guys slowly inch out of the room and hand in hand you both take night-shifts for the rest of the week keeping an eye on the spider.
honestly you both are scared together and help eachother out, sometimes he whisper yells your name for help because oh god spider and you open the door, throw salt on the ground, drag him out and push inosukes sleeping body against the doorway.
tanjiro eventually gives you both exposure therapy but the mental trauma is already done.
you both are terrified together and it couldn't be a more mutually traumatized and supportive relationship.