Chapter Text
Lucifer
When he gets an envelope addressed to him, he automatically assumes it's a bill for Mammon's credit card debt, Levi's egregious Akuzon purchases, Asmo's most recent shopping spree, or a restaurant bill from Beel's latest feast.
However, the handwritten font makes him pause. Perhaps it's not
He'll open it with a sigh and pulls the contents of the letter out
He automatically goes to who signed the letter to try and prepare himself for what he's getting into
Will raise an eyebrow in slight surprise when he sees it's from MC
A smirk will form on his face as he reads what MC wrote to him
There will be a very faint blush on his cheeks, but he'll deny it
Once he's finished reading it, he'll tuck it away somewhere safe so that even Mammon can't find this treasure
Will venture off to find MC as soon as he's able to
Once he finds them, he'll pin them against a wall or lean over them if they're sitting
"Why don't you come with me and personally tell me everything that was in your letter?"
Mammon
He was fooled the first time MC gave him a letter that just ended up being a letter from Lucifer
He even bragged to all of his brothers that he got a love letter from MC
Nuh uh, he's not gonna be fooled a second time, MC!
Doesn't open it for ten minutes before he tears into it
Oh man! He just tore part of the letter
He scrambles for some tape to fix it
Once it's fixed he's cursing himself for ripping the letter
His face becomes almost unbearably hot as he skims through the written words
He re-reads it once, twice, twenty times before he has to take a break and bury his face into his pillow
His hand is still tightly gripping the letter, making it crumple ever so slightly
He wants to text his brothers and brag about it, but he also wants to keep this all to himself
Places the letter with his most valuable treasures - this is more valuable than Goldie
Texts MC to come to his room right away so that they can spend some time with the Great Mammon
Leviathan
Thinks it's a joke
No way would MC write a love letter to him
Is upset, because even though it's a joke, he wants it to be real
Sends a group text to everyone asking who sent a fake letter from MC to him and that it's not funny
The brothers all erupt in envy that Levi got the letter and not them
He still thinks it's a joke and puts it to the side - doesn't actually crumble it and throw it away, because a part of him still wants to hold onto it, even if it is fake. He can just imagine it's real when he's feeling really lonely
Will only truly realize it's real when MC shows up at his door and informs him that it's actually real
Uwahhhhh! No way is a normie tactic going to work on him like this
Except, his face is bright red and he's covering his face with his hands
The normie tactic is totally working and his heart is just going ドキドキ！
Satan
A smile forms on his face and he feels a sense of serenity wash over him, drowning out the raging wrath from within
Just the way MC writes their letters makes him calm
There will be a blush on his face, but he does nothing to hide it or deny it
Once he's read it a couple of times, he'll get up and grab a hidden book. It has small things that he's started to collect that reminds him of MC
Some have pictures of the two of them, dried flowers that were in a field they walked through, and even tickets or receipts to the places they visited together.
He inserts the letter into a page protector and adds it to the book before tucking it back to its original safe spot
Satan will leave the house and return later with a bouquet of flowers
He'll give the flowers to MC with a light blush, asking if they'd like to accompany him on a date to a cat cafe
Asmodeus
Will squeal at the letter and take a million pictures of it
Decides he'll only share a selfie of him holding the letter.
The letter is faced so his followers can't actually read what it says, since he decides it should be for his eyes only
The selfie is killer, though. The letter is held to cover the bottom half of his gorgeous face, but the blush on his cheeks and the loving look in his eyes are still visible.
Will give the letter kisses as he's reading it, just thrilled to know that his darling MC feels almost as strongly as he feels about himself
His heart pounds heavily in his chest, wondering if he feels stronger about MC than himself - it's almost too much to handle!
After reading it and his photo session with it, he'll saunter out of his room to find MC
Once he finds them, he'll drape his arms around them and thank them for their lovely letter
He asks if he can show them how much he appreciated it - either physically to whatever extent MC is comfortable, by having a spa day, or taking them out shopping
Beelzebub
The first thing Beel notices is not the words, but how it smells like MC
Just the smell alone makes him smile with a light blush
As he reads it, both his smile and his blush will grow
He'll be careful to make sure he doesn't get any food on the letter and places it on his end table near a framed picture he has of him, Belphie, and MC
He'll go and find MC and give them a big hug
He says he's not the best with words, but that the letter made him happy and he feels the same way
If he feels like his hunger is getting the best of him, he'll either read the letter or think about it and it helps to soothe the hunger pains
Belphegor
Once he saw what the contents of the letter held, he moved so most of his face was buried in his pillow to hide the raging blush he had
Once he's done, he'll sigh and completely hide his face in the pillow while his fingers trace the slight indents on the paper where the writing is
After he calms down, he'll tuck the letter into his pillow and go and find MC
He'll drag them from whatever it is they're doing and force them to cuddle with him
He won't say anything about the letter but will show that he read it by gently placing MC's hand on the paper in his pillow
He'll give a shy smile at MC before burying his face in their hair, neck, or chest
Belphie will give a sign of content as he holds MC and falls into a peaceful sleep