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mammonsbunny · 3 years

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Little adopted mc surpring papa Lucifer for his birthday

I saw your post about requests, I hope I'm not to late! I fell in love with your Lucifer & Diavolo AU where they adopt a child! Any wholesome moments with the kid & them or the brothers/undateables would be so heartwarming! I especially love Beel so maybe Beel, as the biggest and with a big love of his family, seeing the kid and being like "so tiny, must protect" and becoming like her personal giany buddy 🥺❤

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I had this one just sitting in my hc doc completely done, but I forgot to post it *lol*

Ahhhh that au is so wholesome. I'm happy to revisit it. Note that the reader is a toddler-aged kid.

It's a normal evening with your loving parents. At this point, you are used to life with the demons.

It's chaotic at times but they all really adore and spoil you.

One evening you are plotting a surprise party for Lucifer's birthday.

Knowing that Diavolo just can't keep a secret you rope the brothers into helping you.

"Uncle Mammon, I need your help." You know your very well-trained puppy eyes will do the trick.

"Umm sure… what do you need?" Mammon has a bad feeling already.

"I want to surprise Papa with a party but it's so hard to do. He is like a superhero who knows everything." You pout a little in frustration.

"Hearing you call him Papa makes me feel so uneasy." Belphie sighs from the couch.

"More like a spy or something." Satan chimes in.

"Belpie, don't be grouchy and if he is a spy then he is super cool." You are still unable to say ph but nobody minds that.

Both just shake their heads.

"Mammon, will you help me?" Your puppy eyes get even bigger.

He shifts around uncomfortably. "Well I'd love to but sadly I'm super busy."

"But Uncle!" You use your best pouty face.

Causing Mammons face to twist in agony. "Trust me little one, I'd help but Lucifer has giving me this task so I have to do it." He obviously feels bad about it.

You cross your arms. "I'm pretty sure my power is bigger than his."

"Well, yeah of course. You are the most powerful one without a doubt, but Lucifer can be pretty scary if I don't do my job." Mammon fully agrees but he knows what punishment will avoid him if he doesn't do as Lucifer told him to do.

"Papa isn't scary at all." You huff.

"Now, now no reason for that big frown on your face." Asmo chimes in. "I'm just the right demon for you. I happen to have some time and as your most awesome Uncle I will help you with that party of yours." He talks to you with a big grin.

"Wow, you are the best Asmo! You beam at him with a big smile.

"Totally unfair," Mammon mumbles.

"Too bad Mammon. I yet again get to save the day." Asmo grins in a winning manner. "So what are your plans?" Then he faces you.

"I want to make loads of flowers and string them up and then I want to make a huge cake for everyone to enjoy and we also need music. Oh and snacks and games of course." You remember your own birthday parties with glee.

"I see you have some pretty big plans. You can count on me for the decorations. I ask Levi for some music. He has a big collection that even Lucifer envies. For the cake, I'm sure we can entrust Barbatos with that." Asmo is already fully in planning mode.

"That sounds like everyone else will do the work, but I want to do it." You huff lightly.

"I see, in that case everyone will assist you. Satan, you and Belphie will help us with the flowers." Asmo can see that you won't budge so he quickly changes his plans.

"Hey, why me?" Belphie grumbles.

"You make great flowers." You try to encourage him.

"I'm sure mine are better." Satan shoots back.

"Great, I will tell everyone to come and bring supplies. Let's make some room over there." Asmo whips his phone out and sends an SOS to the other brothers.

"Yeah, I will make a sample so they all can look pretty." With great joy you make your way over to the table.

"Some need this more than others." Belphie glances at Mammon.

"Hey, I saw that, and let me tell you my paper flowers can win prizes." Mammon seems to be seriously offended.

"Say that when you aren't too busy slaving for Lucifer." Belphie teases Mammon.

"Just wait and see. Once I'm back I'll show you!" Mammon basically rushes out of the room, almost running into Beel on his way out.

"Huh what was that about?" He is carrying a big box with him.

"Don't mind him. Just join us. We are making flower decorations." Asmo just shrugs, already halfway into an elegant-looking paper flower.

"Alright, but why are we making them?" Beel places the box down, there are party and flower-making supplies thrown into it.

"I'm throwing a party for papa's birthday." You tell him with great enthusiasm.

"I see that's a great idea, but why Isn't Diavolo doing that?" Beel knows that it's usually his duty.

"He is very busy, so I took it on myself to do it." You are feeling troubled thinking about your busy dad.

Beel nods with understanding. "I see then we need to make sure it's a great party."

"That's the right spirit Beel." You smile at him.

"I'm not that good at making these though." Beel sighs at the paper.

"It's pretty easy, let me show you." With great pride you show Beel how to make them.

Beel copies your moves and manages to get a pretty decent flower.

"Good job Beel. I knew you could do it." You pat him on the arm.

"You are very good at this." Asmo smiles gently.

"I'm trying to become reliable." You smile sheepishly.

"That's a pretty big word there, little one. Great job learning that one." Satan nods with a smile.

"Thanks I'm trying to use bigger words but it's not easy." You sigh slightly.

"No worries you are getting there." Satan encourages you.

You nod feeling motivated.

"Have you made new friends lately?" Asmo asks curiously.

"We got a new kid the other day but they are shy. It's hard to play with them." This only bothers you slightly.

Asmo nods in understanding."Just give it time. Kind of like with Levi."

"What about me?" Levi just enters the room, like on command.

"We were talking about a new kid who is shy." You look at Levi, wondering what his advice might be.

"I'm not shy, just socially awkward." Levi looks troubled.

"Isn't that the same?" You don't have an idea.

"Children's words are indeed sharp tools." Levi sighs deeply.

You look at the others seeking for help, but they all shrug.

"Come here and make some flowers," Belphie commands Levi over.

"Ummmm okay." Levi sighs. "I got the music you wanted, Asmo."

"Just put that next to my makeup." Asmo points over to the couch.

For a while you all make flowers until you decide it's enough.

"So next we should make a huge cake. I also want decorations. Maybe a castle cake would be great." Your eyes sparkle just thinking about it.

"Hmm, that might be an issue since we don't have that much time." Satan knows it can take days to make a cake like that and there isn't enough time at all.

You pout, feeling very disappointed.

"How about cupcakes? We can decorate a bunch of them. They will look great and it's easier to make a whole bunch of them for everyone." Asmo brings up a great plan.

"That would be awesome but a birthday needs cake." You agree but aren't fully satisfied.

"How about we make a special cake for Lucifer and cupcakes for everyone else?" Beel thinks it's a reasonable compromise.

"That sounds great. I will make his cake and you all can make the cupcakes." You agree to that plan.

"I will help with that. The cupcakes would be too tempting anyway." Beel knows you can't do it by yourself.

"And I keep Beel from the cake." Belphie chimes in with a smile.

"Sounds great. Do we have all we need?" You look at Satan.

"We have enough for the cake and some cupcakes. I will go and buy more ingredients while Asmo and Levi can handle the first batch of cupcakes." Satan has a very reasonable plan.

"Okay." You agree with a nod and all of you walk over to the kitchen.

It's a bit chaotic giving everyone space to work but you somehow manage.

In the middle of mixing the dough, with the help of Beel, you come to a sudden realization.

"We forgot about candles for the cake." You feel pretty upset by this realisation.

"It's not a big deal. We can't put enough candles on the cake for Lucifer's age anyway." Belphie shrugs.

"It's very important. Without candles, it's not a birthday cake." You sternly look at Belphie.

"Hmm we could put one candle on it would that be enough?" Beel seems to understand that this is important to you.

"Dad said it's rude to remind adults of their age so that would be a good idea." You remember Diavolo saying that when it was Asmos birthday.

Beel nods. "I will get it for him. Belphie you take over supporting the little one."

"No, I need to get the right one. I will go!" You blatantly refuse.

"Okay, then I will assist you with that." Beel can't send you alone and he knows you can be pretty stubborn so this seems to be the best solution to him.

You nod.

"Can you take over for me Belphie?" You look at Belphie.

He yawns. "Sure, have fun you two."

"It's not fun, it's an important mission!" You sternly speak.

"That's right." Beel agrees with a nod. "Do you want to ride on my shoulders or hold my hand?" Beel looks at you with a smile.

"I can walk alone too." You turn away from him.

"I know but I will feel lonely." Beel gives you puppy dog eyes, he is almost as effective as you are.

"Fine, but only because I don't want you to feel lonely." You pout slightly and then take his big hand.

"Thank you. We will be off Belphie." Beel nods towards Belphie, who just waves to us while mixing the dough.

Together with Beel you make your way to the store.

You stand in front of the candles to pick the right one.

Beel gets distracted for only a moment by a new chocolate bar.

That is the moment when a demon approaches you.

Your parents have taught you thughruly what you are supposed to do if a stranger approaches you.

"Hey, are you all alone here?" The demon has a friendly tone but his demeanor doesn't match that.

You keep your distance and shake your head.

The demon comes closer. "Not wanting to talk?"

"Stay away." You loudly and sternly tell the demon off.

The demon seems to find that pretty funny.

You get ready to yell out loud and glare at the demon.

Then the demon looks scared and walks away.

You huff proudly and look for Beel. Who without your knowledge has seen the demon and glared at him, scaring the demon.

"Everything alright?" Beel is worried about you.

"Yeah, I'm a strong one after all." You puff your chest.

Beel pats your head. "Definitely."

"Oh, this candle is good, what do you think Beel?" You suddenly see a purple candle.

"Looks perfect, let's get it." Beel smiles and grabs the candle, he is just glad that this didn't affect you at all.

You pay and return to the kitchen.

A lot of cupcakes are done by now and Mammon has also returned and was promptly put to work, distracting Lucifer.

Belphie had passed out but the cake is all ready to be decorated.

You beam at the sight. "It looks great."

"All thanks to your hard work." Beel smiles and starts to prepare the frosting.

You apply it, creating a very colorful cake in the process.

"What do you think?" Proudly you show the cake to everyone.

"Looks great." Beel approves.

"It's so stylish, I'm jealous." Asmo takes a picture of the cake.

Everyone else also approves.

"Now all that is left is to decorate the room." You start to feel tired but can't wait to see Lucifer's face.

"You can leave that to us." Levi can tell you are getting sleepy and is just trying to help you.

"No, let's go." You wave him off, feeling responsible for the party.

Everyone just sighs.

So you all start to decorate the ballroom, Barbatos helps with this part as well.

It takes a while and your tiredness is getting worse but you are stubborn and push yourself.

The brothers get worried about you and look at each other.

"Hey, can you help me, little one?" Belphie is sitting on the couch.

"What do you need?" Despite being tired you are eager to help.

"I need a nap, but can't get to sleep so can you help me pass out?" Belphie yawns to support his claim.

You are a bit wary at his request but you know he needs his rest. "What do I have to do?"

"Just lay here next to me until I pass out." The couch is pretty big so it's not an issue.

You hum a bit, wondering if this is a ploy to get you to rest.

"Pretty please?" Belphie uses his sleepy puppy eyes against you.

He learned well.

"Okay but only for a little bit." You feel a bit reluctant but join Belphie anyway.

"Thank you." Belphie smiles and you pass out next to him before you even know it.

Once you wake up the whole room is decorated and looks very beautiful.

You look at it in awe but then feel disappointed since you didn't do everything on your own.

"H,,ey little one." Asmo is the first to notice that you are awake again.

"You did such a great job with this all." Barbatos smiles at you.

"But you did the most." You pout.

"No, you did the most. I mean come on we can't do anything like this without a fight." Mammon sighs.

"Wow, that's surprisingly honest of you Mammon." Satan laughs.

Mammon huffs. "Well anyway, it's time for you to do the most important job anyway."

You light up instantly. "What job is that?"

"Getting the birthday boy of course." Barbatos calmly states. "I will get Lord Diavolo."

"Ah of course. Get ready everyone, I'm right back." You basically runoff.

"Be careful when running," Barbatos yells after you, you wave him off.

You dart around the corners to Lucifer's office. Almost crashing into him.

"Hold on right there! What's the big rush, little one?" Lucifer seems confused.

"Papa, you need to come with me right now!" You don't have time for explaining and grab his hand.

"Is there an emergency?" Lucifer wonders what the rush is about.

"No, just come." You feel impatient and start to drag him behind you.

"Alright, I'm coming." Lucifer figures that everything will make sense soon and simply follows after you.

You keep dragging him until you reach the ballroom. "Close your eyes."

Lucifer does just that, still feeling very baffled.

You open the door. "Now you can open them."

Lucifer removes his hands and sees the colorful decorations.

"Happy birthday Lucifer." Everyone cheers loudly for him.

Lucifer is pleasantly surprised.

"Did you all prepare this for me?" He is pretty surprised.

"No, it was all the little one." Asmo winks at you.

You don't want to lie though. "We did it all together. My uncles helped me a lot."

"I see, thank you, everyone." Lucifer smiles at everyone.

"Hell froze over for all I know," Satan mumbles lightly.

"Let's cut the cake, I'm hungry." Beels stomach rumbles.

Everyone giggles at this.

Diavolo brings the cake in. "It looks so lovely don't you agree?" He smiles brightly.

"It really does. You did that, didn't you?" Lucifer smiles gently at you.

"I did." You admit shyly.

Lucifer blows the candle out and compliments the cupcakes before having a slice of cake.

"Do you want a slice too little one?" Lucifer gently asks you.

"But it's your special cake." You want to have some but feel rude about it.

"It is even more special when I share it with the people I love. Diavolo will have a slice as well." Lucifer cuts you a piece.

"Alright, then I will enjoy it." Your eyes sparkle seeing the cake.

Everyone enjoys the party after this.

At some point you pass out, no wonder after all the work you did.

"Look at that being all peaceful," Diavolo whispers.

"Did you have any idea about this party?" Lucifer wonders about it.

"No, they must've heard that I was too busy to plan anything fancy this year." Diavolo feels a bit bad about that.

"Let's bring them to bed." Lucifer carefully picks you up.

In your sleep, you snuggle close to his chest. Softly snoring.

"Our child has a bright future ahead of them. I wonder what kind of partner they will get when they are older." Diavolo muses quietly while walking beside Lucifer.

"I don't want to hear anything about partners for the next 1000 years." Lucifer sighs.

Diavolo chuckles. "I want to see them happy, but I have to agree."

They both place you carefully in your bed. Leaving you to dream about your next great adventure.

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