Archive of Our Own

You’re not really sure how the subject of your older twin brother came about—actually, Beel wanted to know more about your family life—but you definitely knew that you weren’t particularly sure if you wanted the demon brothers to meet him. You loved the brothers—really, you did—but they could be quite… overbearing at best and completely territorial and needlessly dramatic at worse. So, when all seven of them ganged up on you to enforce the decision of meeting your twin brother, you knew that you had the power to say no, but you ended up complying. 

And so, on one afternoon, you and the seven Lords of Sin finally went out to meet with your brother. 

You weren’t sure if the experience would turn out well, but you somehow knew that it would definitely be a memorable event. 

LUCIFER

• As an older brother himself, he absolutely knows what to do.
• He is going all out to impress.
• Lucifer already knew that you had an older twin brother. After all, he had to review your application to the exchange program when choosing candidates. 
• That said, Lucifer is confident.
• Not really.
• On the inside, he’s absolutely stressed and he wishes that you made him coffee that day, because by the Father, he does not want to mess up.
• Family is important to him, whether it’s his family or yours.
• He wants to make his dear MC happy and making sure that each of his brothers are in line and not at risk of endangering their relationship with you is a big responsibility. 
• He will definitely give each of the brothers a two hour (at minimum) lecture before they leave to meet your brother.
• Once he meets your brother, he’s all charm and calm smiles. 
• If he happens to exude an aura that is meant to be domineering, don’t mind him. He can’t help his nervousness.
• (Please don’t ask him if he’s nervous. He’ll pout and stress about the situation even more). 

MAMMON

• Dying.
• Absolutely dying. 
• Mammon already knows that Lucifer is going to go all out to impress, so Mammon has to up his game. 
• It’s not enough to make sure that you’re satisfied with him, The Great Mammon, he also wants to make sure that your brother likes him too. Because if your brother likes him, then you’ll like him more because of his effort, right?
• Right?
• That’s how it works?
• (The boy is nervous, please go easy on him).
• Mamon has to give himself a pep talk on how not to act around humans: not going around calling humans “humans” even though they are humans, not touching or stealing things, etc.
• Will ask you to hold his hand in the usual tsundere, Mammon way because no matter how old he is, he is absolutely afraid of messing up. (And he definitely does not want to give off the scumbag vibes in front of your brother as a first impression). 
• Probably fell asleep when Lucifer was lecturing him.

LEVIATHAN

• If there’s one thing introverted otaku are good at is pretending to play on their phones while in a high risk situation fraught with socialization.
• It’s not like he’s unhappy with the situation—he’s not, he’s glad that you’re letting him into your life to see your family—but he doesn’t know what to do.
• Is your older twin an otaku like him? What’s Leviathan to do if he’s a normie?
• He will probably be stuck on his phone all the time, muttering things under his breath. 
• If your brother actually talks to him, prepare for either a lot of stammering and blushing OR—
• Rants about animes or other things that Leviathan has fixated on. 
• Out of all the brothers, he’s the most likely to stay out of trouble.   

SATAN

• As much as Satan thrives off chaos and the undying urge to piss off Lucifer, he’s surprisingly the only to actually pay attention to Lucifer’s lecture.
• (He was acting like he didn’t pay attention, but he cares about you, so don’t worry about him).
• He’s probably one of the most knowledgeable about humans due to his reading about humans (and the fact that he’s friends with literally everyone). 
• He’ll probably engage in boring, but casual conversation.
• Honestly, aside from Asmo, he’s likely to be the most charming and the most likely to get on your brother’s good side. 
• (Lucifer hates the fact that Satan is the most charming, but that’s because he’s too busy corralling the rest into what appears to be passable members of polite society). 
• Probably brought a bottle of wine or a nice book as a gift. 

ASMODEUS

• His dear, handsome MC has an older twin brother?
• How cute!
• Is your brother just as gorgeous as you, sweet prince?
• Primps and preens, asks for your opinions on what clothing to wear, etc. 
• All smiles and charm for your brother, but he may say or do things that may raise a few eyebrows, but it’s nothing that can’t be fixed. 
• Make sure that you keep your brother in your sights at all times. You might be immune to Asmo’s charms, but your brother isn’t.
• Asmo will probably be the first to break the ice upon initially meeting your brother.
• He’a also the first to make things awkward if no one starts moving the conversation along. 

BEELZEBUB

• You have a twin brother?
• He thought that he was close to you before knowing this information, but now he feels so much better. Now he can connect with you more on the topic of twin brotherhoods.
• Furthermore, as an older twin brother himself, he’s sure to connect with your twin. Is your older brother someone who can be depended on? Is he reliable, kind, and compassionate?
• Be assured: if Beel thinks that you’ve been mistreated in the past, he will do something about it so long as you give him permission.
• He’s very protective, but will back down once he realizes the full extent of the love you have for your twin.
• Before the visit, he’s definitely stocking up on snacks and meals to tide him over. 
• Like Leviathan, he’ll be mostly quet, but he will offer his opinion now and then. 

BELPHEGOR

• Like Beelzebub, he’s somewhat shocked that you have a twin.
• So you’re more like him than he thought… that’s interesting.
• Will definitely try to stay awake for your sake during the visit, but no promises. 
• When he’s awake, he probably stands aloof and probably cuddles close to you.
• (Even if you’re not in the House of Lamentation, you’re still the closest thing to a pillow). 
• Does not care if he acts and speaks like a demon. Yeah, he’ll do his best to tone it down, but for the most part, he’s pretty blunt and upfront about the type of person he is.
• You better pray that your twin takes Belphie’s weird behavior in stride because he will not apologize. 
• Make sure to bring a cloth or a towel because Belphegor will definitely drool on everything your brother holds dear.