A/N: I just noticed in Nightbringer that after the brothers fell. Satan had a full adult demon form meaning that he never had a childhood which sucks...but oh well. This book is an A.U compared to the game so who cares???

"The Forbidden Book Of Toddlerization"

Mammon: Satan...Don't tell me you...

Satan: *Child* Hahahahaha~! Mammy! Hahahaha~!

Satan finally looked up and was laughing like an innocent child.

Mammon: Not again, Satan...(This is the third or fourth time this happend...Lucifer told him not to read that book.)

Satan: Do you want to play hide n seek? Hahahaha!

Mammon: Well...Maybe one round won't be bad...

One brother popping up after the next...

Just what had Mammon got himself into???

Beel: Is that...Satan?

Mammon noticed Beelzebub holding Kanon on tip of his shoulders whom both looked curious upon the appearance of Satan who currently had the mind of a toddler.

Kanon: Is that another one of your brother Papa?

Mammon: Yep. Kanon. This is Satan. The fourth eldest and the Avatar Of Wrath.

Satan: Mammy~~~! You're really here! I want to play games! Hahahaha!

Mammon: Okay. Okay. Satan. Just hold on.

Satan continued hugging him happily while Mammon pats his head affectionately.

While Kanon looked confused, Beelzebub seems to understand what's going on?

Beel: The Forbidden Book Of Toddlerization?

Mammon: Yep. The Forbidden Book Of Toddlerization.

Beel: *Nods* Ah...

Honestly, how many times have Lucifer told Satan not to touch that book.

It doesn't matter if you read it or not, the slightest touch on the books can revert your mind back to being a infant.

But still, it was pretty dumb yet smart of Satan to use the book to lower Mammon's defenses. Especially for his love of kids.

Beel: So it seems I'm not the only whom ran away from home...

Mammon: *Groans* Goddamnit Lucifer. What did you do now??!

Funny, it usually is the other way around. But Mammon couldn't but feel annoyed at Lucifer's antics. His nasty habit of pushing everyone away while wallowing in pride is getting the better of him.

Mammon: Satan? Did ya run away from home?

Satan: *Childish* Yes! I hate-hate Lucifer! He is so mean! He doesn't care about me!

Mammon: Satan...

Satan: All I ever wanted was to be accepted...to him to be proud of me...but he never was proud of me...he never even bother to acknowledge me! But not you MAMMY! You always were there for me!

Mammon:....Really?

Satan: Yeah~!!!

Mammon: Then how come you pushed me away?

Child-like Satan pouted at his words.

Satan: Because TanTan is dumb! He thought if he pushed MAMMY away, he could finally learn what it means to be an adult! But by the end of the day, no matter how smart TanTan is...He is still a dumb dumb!

Kanon: Why is Uncle Satan talking like a child?

Satan pouts more at the little girl.

Satan: I am not a child! Take that back!

Kanon: If you're acting like a child. Then you might as well be treated like one.

Satan stick his tongue out at her while Kanon gave a smug smile at him. Mammon rolled his eyes while fighting the urge to laugh while Beel was thinking about food being oblivious to the situation before him.

Mammon: That's enough ya two. Alright fine. Satan you can stay. But I will talk to you later. (When your mind regress back into adulthood...)

Satan: *Hopeful* So you'll play with me???

Mammon: Fine...just one game of hide n seek.

Satan: Yay! Playtime with MAMMY!

Kanon: Childish...

Satan: Shaddup!

Kids these days. Seriously...

*Later*

The Forbidden Toddlerization Spell didn't last long as Satan anticipated as he swore underneath his breath. So he tried to pretend to still act like a child. Hopefully Mammon wouldn't notice. 

Mammon: How dumb do ya think I am, Satan? I know you're back to normal self.

SHIT.

Mammon: *Stern* Alright. Satan. Start talking.

Satan: H-How did you-?

Mammon: Doesn't matter right now? What are you doing here?

Satan felt skittish and meekish seeing Mammon act all stern making him feel like a child that just got caught by their parent doing something irresponsible.

Satan: I...wanted to see you...

Mammon:....And?

Satan sighed knowing Mammon wanted more answers.

Satan: Lucifer threatened to cuff me in chains and throw me in the cellar again.

Mammon almost felt the urge to facepalm. It's been a while since Lucifer tried that method on Satan. How many brothers is Lucifer going to lock up til he's fucking satisfied?

Mammon hasn't seen the fourth eldest locked up in the cellar since...their arrival at Devildom...

Satan: So...I ran away from home like Beel...I'm not even surprised he managed to find you...speaking of Beelzebub, where is he?

Mammon: Beelzebub went out with Kanon to get some ice cream & Lil D #2 went to go do some daily tasks given to him by Barbatos...so it's just you and me alone for the time being.

Satan: Oh....

GREAT...

Mammon: We need to talk.

Satan grumbled. When Lucifer wants to talk, it's never good. But when Mammon wants to talk, no one has a say in this. Just shut up and listen.

Mammon: I'm still mad at you, ya know.

Satan: I know...I have no words to explain how much guilt I felt after you left. Words cannot express how sorry I am and I wish to make things right between us-?!

Mammon: Satan. Shut Up.

Satan flinched as he felt the anger and rage rising inside the second eldest. How could he missed that beforehand? If he would've noticed. He could've stopped the others from saying hurtful things to Mammon.

But that's just the thing...he didn't....instead, he joined in with them.

Mammon: Words is not going to help you from what I'm about to say to ya. Right Here. Right Now.

Satan gulped as he felt the rage intensify hundred times. Mammon is pissed.

Welp. Satan is screwed...

And here...we thought he was the literal Avatar Of Wrath.

Mammon: *Venom* Ya got some nerve showing up here.

Satan:....

Mammon: Seven months, Satan...Seven months since that incident. Ya guys waited this long to reach out to me. Now that things aren't going yer way! Now ya feel the need to see me?!

Satan: I-I know...I...

Mammon: Seven Months...Since I finally decided ya guys don't really care about me at all. Always telling me I don't deserve to live.

Satan: No! Mammon! That's not true!

Mammon: Satan...Ya said it yerself!

Satan:...

*Flashback*

Mammon: What? Why are y'all givin me that look, huh? Like I'm gross or something? Eh. Don't even say it. You're thinkin I'm a scumbag, an idiot, an moron. I'm nothin but a giant ball of greed in the shape of a demon, right?

Satan: Pretty much, yeah.

Mammon: See?! I knew it! Ya know right, you're right! I'm lower than low, worst than trash. I'm a giant worthless loser that even deserve to live!

Everyone just nodded in agreement.

Mammon: So like usual, you guys are telling me to kill myself?

Satan: You got that right. Why are you even alive??? I'm ashamed to have you as my older brother. 

Mammon:.....

*End Flashback*

Satan:...

He was right.

In fact, there was something wrong with Mammon that day. It was strange to him to agree with them whenever they bullied him. But instead of feeling concerned. They all just laughed in his face and agreed that he deserved to die.

How...How could Satan be so foolish?!

A/N: Like seriously, season four was basically "Hate Mammon Season". It scored zero points in my opinion. 

Mammon: Ya just proved it Satan. Ya proved that you don't care about me. The only reason why you're here is because like what happened with me earlier, everyone is ganging up on you now and shunning you for being angry & wrathful...

"Just like how you all bashed me for my sin."

Satan:....

Hearing those words made Satan never felt so small in his life.

Mammon:.....Huh. Here I was hoping you put up more of a fight. So I'm right. Ya truly don't care at all.

Satan: NO! MAMMON! I DO! I CARE ABOUT YOU!

Mammon: *RAGE* THEN WHY DID YA WAIT SO LONG TO TELL ME THIS?!!!!!

Satan flinched as Mammon screamed at him more.

Mammon: LIVING WITH YOU ALL WAS A FREAKIN NIGHTMARE! DON'T EXPECT ME TO FUCKING FORGIVE YA NOW THAT YA COME HERE BEGGING FOR FORGIVENESS BECAUSE THINGS AREN'T GOING YOUR WAY!!!

Satan:...

Mammon: *Mocking* How does it fuckin feel, Satan?! How does it feel for everyone to look at you with hate and disarray for your sin?! Because for CENTURIES. That's what you all did!  Ya guys dragged my names through the dirt! Pushed me around and called me names! Tearing through my soul til it was bleeding!!! Even when I couldn't take it anymore! You all told me to shut up and deal with it! Now ya guys are going through what I went through and now it's a bad thing?!!!

Satan: M-Mammy!

Mammon: Don't you "MAMMY" me! After all these years! You don't DESERVE to call me that!!!! I took care of ya  when no one else wanted to! Not even Lucifer wanted you!!! I did whatever I could to keep ya safe from them! I tried my best to raise you and watch you grow...only for ya to stab me in the back for those self-centered assholes who never wanted ya and blame me for things you did to fuck up the life I gave ya! For someone whose smart you really are stupid, Satan!!!

Mammon's voice shook through the house causing Satan to back up in fear as Mammon advance towards him.

Mammon: *Mocking* It sucks don't it Satan? To be bash for your sin?! To have everyone look at you the wrong way...Well guess what! I don't want your pity, Satan!

Satan: I'm not pitying you! I'm really sorry! I know I fucked up! I really care!

Mammon: Ya never cared before. So why start now? Because everyone in the world turned aganist you? Because you scream about how you hate all of us til your throat hurts?! Always screaming about how IRRITATED you are?! Because you tried to kill us and destroy everything in your path?!! Lead everything to the path of destruction?! Getting locked and chained up because you can't control yourself?!!!

Satan: *Sad* No....

Mammon: When was the last time you were ever nice to me?

Satan: I........

Mammon: Go On. Say It. Name one time you were ever nice to me and maybe I'll change my mind....

Satan:........

Mammon:.......Wow. Seriously?

Satan:......You're right. I...I don't deserve your forgiveness. I know an apology isn't going to fix things. I-I'm not a good brother! I know that a-a-and I realized that! I know! B-But...

Mammon: BUT NOTHING SATAN. If you knew you were not a good brother, then stop trying to act like one and justify your mistakes...Because after all...

"You are no better than Lucifer..."

Just like that everything was shunned into silence as Satan gaped at him. Never...Never would he actually hear that from Mammon of all people.

Sure, he didn't mistake him as Lucifer as everyone else does but...hearing that sentence crushed his heart.

Satan felt his entire body shake and tears fall down his face. He tried to say something but all he could come up with were incoherent babbling and pitiful sobs making it difficult for anyone to understand him.  The annoyed yet vexed look on Mammon's face directed at him didn't make it better.

He let his entire body dropped to the floor right at Mammon's feet.

Satan: Y-You're right. You're right about...everything. Like I s-s-said before. I'm sorry. I-I'm so sorry!!!

Mammon:....

Satan: *Sobbing* I don't deserve you, MAMMY! You was the only one who truly cared about me! You fed me, bathe me, clothed me, gave me books, cats, and yet...yet I...pushed you away! I mistreated you! I abused you! I laughed at your pain and misery! I-I'M SO SORRY!!!

Satan screamed his heart out on the floor as the tears hit Mammon's brown carpet. He pathetically crawled over to Mammon holding onto his legs scared that the second eldest would kick him away.

Satan: *Crying* MAMMY...MAMMY!!! PLEASE! DON'T KICK ME AWAY! MAMMY!!!

Mammon:....

The second eldest had a half-expecting mind to kick Satan away, tell him to get out, and never return. Go back to the House Of Lamentation & suffer under Lucifer's dictatorship til the end of time for all he care. 

But seeing the fourth born and physically youngest on the carpet crying his eyes out just didn't feel right for him to do it.

While he's satisfied with seeing Satan admonish his actions but he felt his heart twist seeing him cry.

Mammon may be angry but he wasn't heartless.

Mammon: *Sighs* (Why do I have to be nice guy here?)

....

Mammon: Alright...Alright...Come on. There There...

He held Satan in his arms as he continued to cry. He let the Avatar Of Wrath let out all of his heartache frustrations. He hugged the younger male who returned it.

Satan: I'm sorry...

Mammon: I know...

Satan: I hurt you...

Mammon: I know...

Satan: I was so angry when the others hurt you and I lost control...now everyone hates me...I...don't know how to feel love again...

Mammon: Satan...

Satan:...I'm not good enough for anyone...not even for you...Besides you... No one truly cares about me...

Mammon:.....

The second eldest touches the blonde hair before patting him softly. Satan begin wiping the tears from his eyes as Mammon continue the gesture.

Mammon: I know how that feels...a lot.

Mammon gently touched Satan's face with his hands.

Mammon: Satan. Look at me.

Satan looks up to see the genuine look in Mammon's eyes. Something he hasn't seen in such a long time.

Satan: Mams....

Mammon: Ya know TanTan...I am still angry at you. But I don't hate ya...

Satan: But you said...

Mammon: Back at the student council....I knew what I said. But I still love you...But...I just don't know if I can find in my heart to fully forgive all of you...It just hurts...

Satan:......I can't blame you. If it were me. I would've cut off all ties with them... especially with Lucifer...We're all fucking blind. We truly don't deserve you.

Mammon:....

Satan: He never saw me as his own kid. I was just....an nuisance to him. A replacement for Lilith. An accident that shouldn't have been born...Sometimes I wish I was your kid. I wish I was created from you instead of him...

Mammon:....Stupid. Ya are my kid. Sure, your Lucifer's kid by blood. But I did took care of ya.

Satan: ....I'm sorry Mams...Will you...let me find someway to make it up to you?

Mammon:....Well first. I do have a thought.

Satan:...Okay?

Mammon: How about...ya start being an uncle to Kanon...help her with her educatin, be her tutor, and I might reconsider giving you another chance to be my family again?

That offer didn't sound too bad.

Satan: Deal.

Mammon: But I will make this clear Satan. If Kanon had any complaints about you that makes her uncomfortable. I will take drastic measures, understand?

Satan:.... Understand. You won't regret this.

Mammon:....(I hope not...)