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The Demonstration

Summary:

Asmodeus stays in your room while his bathroom is being repaired. Mammon is a wee bit jealous. And you are learning how to set boundaries to keep things fair between your lovers.

Notes:

Welcome to 'The Demonstration'. For chapter one, please enjoy some smutty-fluffy Mammon/Reader goodness, a dash of Asmo, and a sprinkle of Dia/Luci/Barb. Then stay tuned for chapter 2, for a threesome with Mammon and Asmo which will no doubt incur additional tags.

(See the end of the work for more notes.)

Chapter Text

After the incident in Asmodeus's bathroom, the Avatar of Lust insists on sharing your room until the repairs are complete. You’re spared that first night as both Lucifer and Beelzebub insist that you be left alone to recover (though Lucifer is still by your side when you wake the next morning).

 

"He can stay in my room tonight, I'm the one who broke the wall again," Beelzebub mumbles, hanging his head.

 

"Technically, I broke the wall," you say, patting his arm. "You were just my hammer."

 

But Beelzebub has a guilty expression across his features as he shakes his head. "If it weren't for me, you wouldn't have nearly drowned. I should have been more careful."

 

You suspect that’s where the offer to put Asmo up for the night has really come from—the notion in his head that somehow, he was responsible for what transpired, including your distress at being pinned down under the water with four demons on top of you. You relent to letting Beel take Asmo in for the first night, grateful that you won't be tempted to exert yourself again.

 

But now that Sunday evening is settling in, Asmodeus cannot be dissuaded.

 

"Which side of the bed would you prefer, hmm~?" he asks in a sing-song voice as he folds his R.A.D. uniform neatly over a chair. "Actually, let me rephrase. Which side of the bed would you like to be fucked on?"

 

"I am still definitely out of commission," you say, hands defensively in front of you. "It's not that I don't totally want to drop my panties every time I see you, Asmo—legit, I consider just not wearing panties when I'm in this house, because I want to drop them so often—but after Friday night with Lucifer and Ba ... bath time with you and Mamms and Satan and Beel yesterday, I think my vagina will literally break if I take another demon dick too soon."

 

He feigns a sound of disappointment, but then winks at you with a smile. "I understand. I wouldn't want to break that perfect little pussy of yours, my angel."

 

You feel your face redden at the new endearment. After Lucifer's moment of panic yesterday, in which he suggested that the incident in Asmo's bathroom may be due to distant Celestial ancestry, Asmodeus adopted the term. At first, he said it with a hint of sarcasm, but over breakfast this morning, he referred to you unironically as his angel. You made your amusement known in the 'My Loves' group chat before dinner and see the first of the replies on your D.D.D. while Asmodeus makes himself at home in your room.

 

Diavolo: That is hilarious, my love!

 

You: Admittedly, I don't hate it. It's sweet.

 

Barbatos: Indeed, my love. But not as sweet as your mouth.

 

Diavolo: Are you imagining her mouth on your cock again, Barb?

 

Barbatos: I was referring to her mouth on my mouth, but I suppose that works too.

 

Diavolo: I'll let you guess which one I'm thinking of *wink demoji*

 

You: *wink demoji*

 

Lucifer: No one is to touch you until you've recovered properly, my love.

 

Barbatos: That is understandable. If I were to kiss her now, I'm not sure I'd be able to resist the temptation to take things further.

 

Diavolo: Not even me?

 

You: Dia, you've got the biggest cock out of all my lovers. Sorry, my love, but Lucifer is right.

 

Diavolo: *blushing demoji*

 

"And what might you be smiling at, my angel?" Asmodeus chimes, sliding onto the bed next to you.

 

He leans a head on your shoulder as you quickly lock your D.D.D. screen and set the device face-down on the pillow next to you.

 

"Never you mind," you say, teasingly.

 

"Which of my brothers are you sending sultry messages to, hmm~?" He wiggles an eyebrow at you.

 

You give him a playful roll of your eyes. "All but Levi," you say, meeting his amber gaze. "Oh, and Belphie," you amend.

 

Asmodeus giggles. "I would be concerned if you were messaging Belphegor, since you've never met him.”

 

You laugh in agreement, though a knot ties itself in your belly. Belphegor's existence doesn't come up often, for which you are grateful. It's easier to keep the secrets of the attic to yourself when you don't have to actively lie to your lovers. It's been over a month since you last visited the youngest. You're still not entirely sure what to make of him, but you're only two pacts short of being able to set him free to talk to Lucifer about their disagreement. Though it makes you anxious to keep your knowledge from your lovers, you tell yourself it's a white lie. In the long run, it will be harmless. Things will work themselves out and the brothers will thank you for it. Still, you can't shake the way it weighs on your conscience, especially now that Asmodeus has made that comment.

 

"Is something the matter, my angel?" he asks, the teasing in his voice gone.

 

The way his eyes go wide with worry makes your heart ache, and although you understand it comes from a need to comfort you, you find yourself trying to soothe him.

 

"Everything’s fine, Asmo. I'm just really tired." You yawn, genuine, though well-timed.

 

The Avatar of Lust beams at you. "Well, settle in, dearest. I'm going to snuggle you all night long. I'll get the lights."

 

You nestle into the sheets as he puts the lights out. You can't see him in the dark, but you smile as the mattress shifts under his weight and when he presses a chaste kiss against your lips with a hum. He snakes his arms around your middle, spooning you as he rests his face against your hair.

 

To your delight, Asmodeus stays true to his word. Not only does he refrain from getting you riled up—for which you are eternally grateful—he also holds you for the entire night. He's still cradling you against his lithe frame when your alarm sounds in the morning. 

 

Classes are more relaxed now that midterm exams are out of the way, and the new content is refreshing after so much revision. Mammon is glued to your side all day, though he's exceptionally quiet. During lunch, you pull him into an empty classroom with you and close the door, pressing him up against the wall with a gentle hand. You look up to his blushing, though you can see the rush of excitement in his eyes.

 

"What's on your mind, Mammoney?" you ask in a quiet voice.

 

When he doesn't answer, you stand up on your toes to brush your lips against his. Some of the nervous tension that has been hanging around him all day dissipate. He slides one hand to the back of your head as he returns your kiss, lips moving slowly as you breathe each other in. You pull away from him carefully, cupping his face in your hands. He bows his head to rest his brow against yours. His hands are gentle against your body.

 

"I'm sorry, treasure. I know it's dumb to be upset about Asmo stayin' in ya room. I-I just worry that ya not gonna wanna be with a scummy, money-grubbing scumbag like me."

 

You caress his cheek with your thumb, coaxing his eyes to meet yours. "You’re not a scumbag. And I'll say this as many times as you need to hear it, Mammon. I love you. You're my first guy, remember?" You let the teasing tone enter your voice as he slides his hand over yours, smiling as he kisses the heel of your palm.

 

"Will ya say it again for me, treasure?"

 

You give him another soft kiss, this time only pulling back enough to say, "I love you, Mammon," before your mouth is moving on his again.

 

His kisses become greedy. He pulls your body against his, letting his hands roam over the back of your uniform as you make out against the door. After a couple of heated minutes, his hands are underneath your shirt, cupping at your breasts. He teases the stiff buds of your nipples as your kisses become fiercer. His scent is already encasing your, intoxicating you in a way that makes you squeeze your thighs together. You're painfully wet already. Guiding him away from the door, you pull yourself onto one of the desks, spreading your legs so that Mammon can stand between your thighs. He presses his crotch against yours as you hitch up your skirt, letting the heat of his erection pass through the material. He pinches your nipples between his fingers, causing you to moan into his mouth as you drag yourself against the bulge in his pants. Mammon shudders in response.

 

"T-treasure, I need you," he says, already panting with excitement.

 

You tug his tie off and proceed to unbutton his shirt, parting the material with your hands as you go. "Fuck, Mammon, I need you too. Take me right here, please!"

 

You can hear the murmur of students passing in the hallway, but you ignore the sounds. It's still early in the lunch period, so most students will be at the cafeteria or running their errands around the Devildom's shopping district until the hour is up. Heck, it's a nice enough day outside that Beelzebub could easily convince some of their classmates to play dodgeball. The likelihood of you and Mammon being interrupted so early in the lunch period is slim enough, and of that you are grateful. He unlatches his belt with a fluid motion, opening the front of his pants to free his cock. His erection is aggressive, a dribble of pre-cum glistening on the tip. Yanking the crotch of your underwear to the side, he shoves two fingers into your cunt.

 

"Fuck, you're already ready for me," he gasps, dragging his digits along your clit as he pulls them away.

 

The sensation causes you to tilt your head back. You feel the tip of his cock at your entrance as he buries his face in your neck, rolling your skin gently between his teeth as you moan.

 

"Mammon, please, I need it," you beg.

 

He doesn't make you wait. Mammon pushes his length all the way into you in one smooth movement and slowly drags it back until only the tip of him is still inside. Then he pushes himself into you again. The way he glides into your folds pulls a sharp sigh from your lungs. You muffle the sound against his shoulder as you buckle forward. Mammon keeps one hand high on your thigh, using his thumb to keep the crotch of your underwear pulled to one side while he takes you. His other hand is at the small of your back, keeping you from sliding away from the edge of the desk with each gentle thrust.

 

He keeps his thrusting fast and even. You can tell he needs it badly; the assurance of letting him take you, without any of his brothers there. The craving for your full attention that he needs more than his brothers do. Alone time together is so hard to come by in the House of Lamentation. As much as you desire all your lovers and take pleasure in the way they share you, you too cherish the private moments you spend with each of them.

 

You can feel yourself growing tight around his cock. The way he drives himself into you leaves you quivering. You throw your head back with a quiet moan. The sound stutters from your lips as he fucks you gently.

 

"Room for one more~?"

 

You and Mammon both jump at the unexpected voice. You spot the offending demon—Asmodeus, the Avatar of Lust, with his back against the door. He's giving you both a playful, seductive grin, biting at the corner of his bottom lip. One of his hands is already down the front of his pants, languidly stroking his erection. His other arm is raised lazily over his head, bent at the elbow so that his fingers brush the top of his head.

 

Mammon huffs irritably against your shoulder, his cheeks a deep red. "Can ya not?!"

 

You notice the way he clings you closer to him, though he's gone still inside you. His sudden stillness makes you whimper, your pending orgasm making your walls flutter in frustration.

 

Asmodeus gives you one of his winning smiles and a wink as he pushes off from the door, stepping towards you both.

 

"Mammon, we're sharing, remember?" he teases.

 

Mammon's shoulders slump, the defeat apparent on his face. "I know ..." he says, giving you an apologetic glance before he drops his eyes to the floor. "I'm sorry for being greedy."

 

That look on his face damn near breaks your heart.

 

"See, it's not so bad, is it?" Asmo giggles, pulling himself onto the desk next to you.

 

He cups your breast through your shirt, giving it a firm squeeze.

 

But your blood is boiling.

 

"No!" you spit, clutching Mammon.

 

As the words leave your mouth, there's a flash of white light between you and Asmodeus. He and Mammon both gasp in shock as the chime of singing glass vibrates the air, and Asmodeus is pushed off the table by an invisible force. He lands on the floor with an oomph.

 

"Hey, careful with me!" he snaps before his eyes go wide in realisation of what just happened. "Oh ... I'm ... I'm sorry ..." He covers his mouth with one hand, face suddenly flushed as he looks away from you.

 

"Asmodeus," you say firmly. "Get out, now."

 

You let the command hang in the air between you. It only takes him a moment to pick himself up and depart, closing the door quietly. You feel a pang of guilt for the cold dismissal, but you know this boundary needs to be set.

 

"Um ... treasure?" Mammon shifts his weight nervously from one foot to the other, glancing between your face and the floor. "A-are you okay?"

 

You let out a slow sigh, cupping his face with your hands. "I'm okay, babe."

 

"I know I gotta share ya, treasure,” he says, quietly. “Ya didn't have to send him away."

 

You crinkle your nose, curling your fingers into his hair. "We aren't sharing right now though, Mammon," you say, pressing your lips softly to his. "We came in here to be alone. We're allowed to have some alone-time together." Another kiss, this time you feel the shiver up his spine. "He doesn't get to just invite himself to join in. And I'm not going to entertain the option if he's being a jerk about it."

 

You see the way the corner of his mouth twitches. "So ... ya gave him a little yeet with your newfound Celestial powers and then used ya pact to make him fuck off? Because ya wanna be alone with me right now?"

 

You slowly grind your hips against his erection in response, letting him shift inside you. The motion causes him to let out a breathy cry and he begins to thrust into you again.

 

"Fuck, treasure, you don't know what you do to me."

 

His lips crash against your mouth in deep kisses. You keep your fingers in his hair as he moves through your body with fast, but gentle strokes. You can hardly stifle the moans that escape your lips from the way he feels inside you. The burn of an orgasm between your legs builds quickly, the needy passion emanating between you both driving it faster.

 

"Mammon, I'm gonna cum," you choke out as you feel your cunt go impossibly tight.

 

You can't stop yourself from crying out. Maybe it's just the echo of the empty classroom, but you're certain that you're loud enough for someone to hear. But you can't stop it as your thighs shake around Mammon's waist, helping him slide deeper into your orgasming pussy.

 

"Oh fuck," he gasps.

 

You feel the warmth of his cum as he releases inside you. Pulling your head against his shoulder, you feel his mouth on the back of your neck before his demon form flickers around him and his fangs pierce your skin. Your eyes fly open, startled by the pain as you wince. You don't pull away as he goes still inside you, his mouth still latched to the back of your neck, behind your left ear. The bite feels white-hot when he releases you, but you're too dizzy with bliss to care.

 

"S-sorry, treasure. Did it hurt?"

 

You shake with a small laugh, breathing in his scent. He tries to pull back from you, but you hold him closer. The pain subsides quickly, but you can feel a trickle of blood down the back of your shirt.

 

"I'm okay," you promise after a moment.

 

You pull back from him to see his face. His eyes are full of guilt and concern, and there's a smear of your blood at the corner of his mouth. You wipe it away with your thumb.
 

"Why do you guys keep biting me?" you ask with a teasing smile. "I guess I'll have to wear my hair down for the rest of the day."

 

Mammon blushes. "That defeats the purpose!"

 

You raise an eyebrow at him. "The purpose?"

 

Now his face is crimson and his eyes go wide. "Wait, you don't—?!"
 

The sound of a bell fills the room, signalling the end of the lunch period. You exchange horrified looks for a split second before he pulls out of you and you both scramble to dress yourselves again. He takes you by the hand as you both dash out of the classroom, startling another student who was just about to enter. Instead of heading towards your next classes, he leads you against the flow of students, stopping near the drinking fountains outside the cafeteria. You're both giggling uncontrollably as he pins you up against the wall, the corridors now deserted as the other students have all gone to their next classes. Still laughing, Mammon kisses you wildly, sliding his fingers over the bite at the back of your neck. It takes everything in you not to climb him and make him fuck you against the wall right there. You can't explain the feeling of elation in your stomach and your chest, only that it makes you need him.

 

As the fit of giggles subside between kisses and caresses, you pull back to look at his face, grinning widely.

 

"You should come to my room tonight," you say.

 

He raises an eyebrow at you. "But Asmo—"

 

"—will have to share," you interject, finishing the sentence.

 

Mammon matches your grin, his eyes flashing gold. "What do you have in mind, treasure?"

 

"Let's call it a ... demonstration."