No one can deny the effect you can have on the brothers. Yes, you've been with them for some time now, but that doesn't mean your charm still doesn't catch them off guard. Here are a few scenarios that guarantee red faces from all of them. (1.5k words)
Lucifer
~When you find him passed out at his desk.
You quietly open the study door and there he is, head cradled in one arm, papers scattered, pen still clutched in one hand. It's rare to see him so undone, without his disciplined composure. You nudge his shoulder gently, whispering his name “Lucifer…” and his eyes flutter open, blinking sluggishly as he sits up. You place a warm cup of tea by his hand. He doesn’t meet your eyes right away. “Thank you,” he murmurs, leaving back in his chair, brushing his hair back and straightening his clothes like a reflex, but the slight red in his cheeks betrays how caught off guard he is by your tenderness, and the fact that you saw him like this.
~When you one-up him in front of Diavolo.
Maybe you’ve made a clever remark, remembered a key piece of Devildom lore before he could, or offered Diavolo advice that the prince takes to heart. Lucifer’s expression doesn't change much, but there’s a twitch in his jaw and a slow blink that gives him away. “Impressive,” he says in a carefully controlled voice, but the subtle readjustment of his posture and the brief glance he gives you (when he thinks you won’t notice) says he’s flustered, more than he’ll ever admit. He’s proud, of course, but also deeply unused to being matched, let alone bested.
~When you finally lose your temper.
He’s used to being the one who keeps things together. But one evening, after a string of disasters—a broken door, a food fight, a Mammon prank gone wrong—you’ve reached your limit. He makes an offhand comment about staying calm, and it’s the last straw. You turn on all of them, including him, voice sharp and tone firm, scolding them all like a disappointed parent. The room goes quiet. Lucifer’s brows shoot up slightly as he stares at you, stunned. There’s a weird glint of admiration in his eyes too.
Mammon
~When you praise him without teasing.
He’s so used to backhanded compliments or sarcastic jabs that when you genuinely call him reliable or handsome, without a punchline. His brain short circuits. He’ll blink, look away, scratch at his neck like he’s itchy all of a sudden, and laugh too loudly. “Y-Yeah, well, ‘course I am!” he stammers, but his ears are pink and he won’t stop cheesing about it.
~When you catch him staring and don’t say anything, just smile.
Mammon stares a lot. You just usually don’t catch him. So when you look up from your book or drink and catch his gaze already fixed on you, he panics. But then you smile, sweet, knowing, and just a little smug, it knocks the wind out of him. “Wha—! I wasn’t lookin’! Mind yer business!” he yells, turning bright red. But his eyes keep flicking back to you like he can’t help it.
Leviathan
~When you walk in while he’s singing to himself.
He’s in the middle of some anime theme song, headphones on, and half-dancing around his room. He doesn’t hear the door open until it’s too late. You’re standing there, smiling. Levi yelps, drops the remote, and nearly trips over his tail. “W-W-WHY are you here?! You’re supposed to use the password!!” He’s bright red and curls into a ball like a flustered shrimp.
~When you cosplay as his favorite character.
You step into his room wearing a Ruri-chan costume, specially tailored to you. He gapes. His brain completely freezes. “Is this... is this real life?!” he whispers, tears threatening to gather in his eyes. “You... you really did this for me?”
~When you snuggle up to watch him game.
“W-Wait, you can’t just—!” He’s trapped, controller in hand, body stiff as a board while you rest comfortably against him. “I can’t focus like this! You’re too close!” But he doesn’t move away. He tries to obscure the redness of his cheeks, he fails miserably.
Satan
~When you catch him reading a romance novel.
He’s usually buried in classics or rare texts, but today he didn’t expect you to find him in the library with a dog-eared romance, totally invested. “You’re reading that?” you ask. His eyes widen. “It’s... for research,” he says too quickly. You sit next to him with a smirk. He sighs in defeat, but the way he won’t quite meet your gaze gives him away.
~When you're cooking together.
You come up behind him quietly as he stirs a pot, one hand on shoulder, other hand raising a spoonful of what you’re both making to his lips. He’s startled by how intimate it feels. When you tease that you’re the better chef, he raises an eyebrow, but he’s smiling (and a little flushed). He’s not used to gentleness like this in the kitchen. He likes it more than he admits.
~When you give him cat-themed gifts.
He insists he doesn’t need trinkets, but you’ve caught on to his weakness. A handmade bookmark with paw prints? He clears his throat and thanks you quietly. A mug with a curled-up kitten? He drinks from it in private. But when you give him a cat-ear headband “just for fun,” and then slip it on your own head with a smirk, he chokes on his tea. “I’m not wearing that,” he says, but you drape it onto his head anyway, and the way he turns crimson and looks away tells you all you need to know.
Asmodeus
~When you turn the charm back on him.
Asmo’s always the flirty one, and it's difficult to fluster the Avatar of Lust. But when you take the lead, leaning in close and whispering something suggestive, his eyes widen. Especially because you don't act like that in front of the others, it makes him feel especially special.
~When you help him remove his makeup
Late at night. He’s tired. You sit him down and start removing his makeup with slow, gentle motions. He goes silent, blinking at you. “You’re so sweet… that’s not fair,” he whispers. He looks away with a shy smile, hands nervously playing with his robe.
~When you wear one of his robes around the house.
You strolling the hallway after a shower, wearing his silky, floral-printed robe like it’s yours. He gasps dramatically from down the hall, “Is that mine?” he clutches his chest, eyes wide, and scurries over.“It looks better on you,” he purrs. He pads over, fingers brushing the collar at your neck. “I need to take some pictures! And then take it off. Slowly.” Of course, it's only natural for him to fluster you in return.
Beelzebub
~When you offer him your last bite.
He blinks slowly, looking from the fork to your face. “Are you sure?” he asks softly. When you nod, he takes it so carefully, almost reverently. “That’s… really nice of you.” His cheeks glow pink, and he looks at you like you just gave him your heart. The little smile he gives you when his mouth is full makes you melt.
~When you wipe food from his mouth, then eat it.
You're both sharing a creamy, chocolate dessert and something sticks to the corner of his mouth. Without hesitation, you reach out and swipe it off with your thumb. He freezes for a moment, watching you inspect your thumb briefly before licking it. His eyebrows twitch upwards and his face turns red. He doesn’t say anything, he just quietly beams.
Belphegor
~When you gently brush his bangs from his face.
He’s laying in bed, half-awake, and you reach out to fix his hair. His eyes open slowly, a little wide. “Don’t look at me like that,” he says, voice rough with sleep. “It’s weird.” But the way he avoids your gaze, the way his cheeks bloom pink, says he didn’t mind.
~When you say you dreamed about him.
He plays it off at first. “Yeah? I bet I was amazing.” But he can't hide his curiosity, he brings it up again and asks what it was about. You dreamed about him holding your hand, or watching stars with him, or something gentle like that. His smile turns sheepish. “You’re weird,” he says, voice quiet, affectionate. He won’t say it, but he’ll try to recreate that dream later. Just for you
~When you play with his hair while his head is in your lap.
Occasionally he dozes off that way, wakes up, tries to run his hand through his hair and finds some strands braided. When he blinks the blurriness away he sees your face above him. He opens his mouth but nothing comes out, just a slight huff as he turns closer towards you. You catch the red of his cheeks and ears and you know he secretly likes it.
