Disclaimer!
I'm not going to do all the demons since there're soooo many of them ( if that even makes sense) but I will try to do most of them!
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"What your relationship with them will be like?"

Kokushibou
-quiet man but with a strong heart
-will show affection but through subtle actions
-deeply and truly does care for you
-scared to hurt you tho
-WILL do anything for you
-whipped as hell for you-
-his hair is majestic so you do different hairstyles with it.
-he highkey loves it
-umm gentle but passionate kisses all the way!
-gets you your favorite food even if it is a hassle for him
-when you're asleep he admires you and hugs you tightly.

Douma
-how did you end up with him? Well through his cult obviously
-jkjkjks he just kept on annoying you and following you everywhere until you gave in
-and you don't regret it
-A CRACKHEAD-
-this man will deadass dress up as a clown if you asked him to
- "you smell sweet and delicious but I won't eat you darling~"
-treats you like a goddess
-has actually made you step on his head because he legit thinks you're a goddess
-told ya he was a crackhead
-umm midnight strolls in the forest
-he loves to pick you up bridal style cus it's the closest thing to marriage UwU
-planning on marrying you
-you sit on his lap whilst he tells you how much he loves you and how much he wants to marry you.

Akaza
-VERY PROTECTIVE
-A G G R E S I V E    T O.   E V E R Y O N E
-but towards you he's an icecream
- melts when he hears your soothing voice.
-hugs you all the time
-"please don't leave me"
-rough kisses
-relationship is an emotional rollercoaster but the ending is always a happy one :)
-gets you small but precious gifts
-LONG hours spent talking
-you guys have great chats
-needs cuddles cus he loves cuddles
-cuddles plz

Nakime
-wow. Don't know how you were able to even get close to her but neither do you.
-also quiet but she's mostly shy.
-loves when you comb through her hair
-likes to caress your face
-rarely gives kisses but when she does it is soft
-feels happy when you listen to her playing on her instrument
-doesn't seem to care from the outside but inside she really does
-more loyal to you than Muzan
-Muzan is probably shaking-
-he wishes he could relate
-she teaches you how to play on the instrument
-always gives you back hugs cus they're her favorite
-she likes skinship a lot which is quite unexpected of her

Gyutaro
-L O V E S.  YOU
-after Daki tho-
-jkjks he loves you both
-your bodyguard
-he prefers cuddles over kisses
-but since you're irresistible he'll let you kiss him
-gives you piggybacks UwU
-he always asks sweet simple questions like 'how are you?', 'was your day fine?','did you sleep well?'.
-yep he is a sweetheart (not to others tho :o)
-despite his harsh personality you know that he is genuinely a nice person
-relationship is more of a best friend kind of relationship.
-but you guys still do things that couples would do
-"I can't believe you like someone who looks like me"

Daki
-spoil her
-she loves it when you do
-kisses you all the time
-H I C K E Y S
-she likes to lay her head against your chest
-when you're busy she gets a bit 'tsundere' and pouts lot.
-it's cute to you tho
-she teases you a lot
-you carry her bridal style
-she gets flustered :D
-when blushing she always tries to hide it but fails
-"Hey! Give me attention please"

Kaigaku
-a bit of a stubborn man but he makes you catch feelings for him
-you hate it but love it?
-"ha! I told you that I would win! Now, give me a kiss"
-likes to show you off because you are art itself to him
-but hates it when guys tries to hit you up
-they all end up being found dead-
-K I N K Y
-also a pervert
-his favourite thing is to wrap his arms around your waist and bury his face into your neck OwO
-l O V E S your scent
-passionate and kinky kisses (a lot of tongue movements)
-buys (steals) clothes, jewelleries, food,souvenirs for you
-there are a lot of intimate moments

Rui
-I N N O C E N T
-but lowkey knows whats good
-hates being away from you
-shows you tricks with his blood demon art
-hold his hands....he likes holding hands
-lONG ASS CONVERSATIONS
-treat this poor boi well
-he just wants sum luv :(
-"I wish I could be with you in the sunlight"
-BUT when a guy is tryna flirt with you or is staring at you he WILL annihilate them
-likeLegitShankThem
-rip to all em men
-pure relationship
-he only trusts you and truly loves you

Muzan
-C L A S S Y
-the man is sum high noble ass demon with high expectations
-lucky for you tho, you meet his expectations
-calls you nicknames such as 'darling','love','honey'.
-calls you PerFeCt
-"such a divine being you are"
-genuinely smiles only with you
- most nights he sleeps next to you even tho he can't actually sleep but he just takes in your breathtaking features
-he likes you not only cus of ur looks but also ur intelligence, personality, manners.
-spoils you cus he is basically a sugar daddy
-kisses can either be soft and delicate or basically hardcore, hungry and desperate. There is no in between.
- dances with you in empty ball rooms cus he's a romantic guy like that.

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Hope yall enjoyed! 🥰