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It all started a long time ago- When Mammon saw that Belphie was upset and decided to comfort him.
Belphie had been upset about something that had happened earlier that day, he doesn't remember what it was anymore, as, this had all happened a long time ago. But that wasn't important anyway-- You see, Mammon was being such a kind older brother- Belphie couldn't help but feel flustered at it all.
Mammon really did love them all, didn't he?
The thought made him feel warm- No matter what he did, Mammon would always love him, wouldn't he? It was reassuring.
Finally, after a while of Mammon trying to help him/calm him down, it was getting late. The sky was pitch black and all of their other brothers were already in bed.. So, Mammon offered to let Belphie sleep in his room- It was an awkward proposal, but he knew Belphie was a cuddler, maybe it would make him forget what had happened earlier?
Belphie accepted reluctantly- It was already so late, and he didn't want to sleep alone- Of course, he could've gone to Beel.. But it felt special, and warm, when he thought of cuddling Mammon.. Mammon was his Oni-Chan- Mature when he needed to be, soft, and definitely nicer then Lucifer.. But, distant enough for Belphie to crave more time with him.
Yes, you read that right. He wanted to spend more time with Mammon- But it's not like he could say it out loud! That was way too embarrassing!
So this was the perfect set up- Mammon offered it first! Who was Belphie to say no?
And so, they got into bed. Mammon's bed.
Belphie knew his brother slept in the nude- So, he felt bad when Mammon kept all of his clothes, except for his shirt, on.
He could immediately see how uncomfortable Mammon looked in his tight pants- Oh, and they were tight alright.. Belphie could see all the lines and curves on his brothers thick legs.. And his small yet still somehow perfect ass- Not that he was purposely looking! And- Don't even mention Mammon's abs- Fuck, did Mammon work out or something?? Agh! No wonder he's a model..
Belphie blushed at his own thoughts- Was it gross to think about his brother like so? It was just compliments, right? It was nothing serious- He looks at Beel's muscles too, after all.
Belphie looked over from the corner of his eye- Mammon looked tired, and small. Belphie wanted to cuddle him- But he didn't want to initiate it..
Belphie kept his eyes on Mammon, unconsciously scanning his brothers entire figure- Was it him, or was the room getting warmer?
He couldn't help but think of his current situation, he was in Mammon's bed- Mammon was shirtless.. Oh, Belphie's Oni-Chan looked so good in the moonlight- Belphie quickly averted his eyes and felt his face light on fire when Mammon tsked and turned to face him.
"I'm sorry- Are you uncomfortable? I'll go put on a shirt-" His caring older brother kindly decided, now sitting up, as if he had sensed Belphie's eyes on his body- Belphie swiftly shook his head. "No, no! It's fine- I'm not uncomfortable, just t-thinking!" About you.
Mammon gave him a look in return but laid back down, "..Alright, but tell me if you want me to put something on, I won't be mad."
Before the silence could take the room hostage, Belphie decided to go for it- He latched onto Mammon, hiding his face into the second-born's shoulder when Mammon looked over. "Sorry.. You know I like to cuddle-" He defended his actions, to which his brother laughed charmingly. "I know, it's fine. I expected you to."
Belphie could feel his heart race at his brothers laugh- Had it always been that cute? Fuck.. What was wrong with Belphie today?!
"S-Shut up.." He pouted, before curling into his brother even more. He didn't miss the way Mammon looked at him endearingly- Like Belphie was a little kid. Man, his older brother was just way too soft, huh? Stupidly cute Oni-Chan..
"I hope you're feeling better.. Good night." His brother smiled gently- Making Belphie almost lose it- Mammon never smiled like that! It was always a cute little cheeky grin or an attractive evil smirk- No one told Belphie that Mammon was this fucking adorable!
Is this why Lucifer favored the second born?! Because god damn it, maybe Belphie should start favoring him too!
Belphie quickly calmed himself down over the stretch of a couple minutes- His thoughts were still racing with Mammon on his mind, but even despite it all, he kept his focus on feeling Mammon's heartbeat as it went calm and rhythmic.. He watched in a comfortable silence as his brother's chest went up and down calmly-
Mammon looked so cute in his arms.. He looked small, god, how was someone so weak his Oni-Chan? He felt the need to protect Mammon- At least right now he did, he doubted he'd feel this way in the morning.
A few more minutes went past, Belphie yawned and blinked slowly a couple times, his eyes never leaving Mammon. He was enjoying the sheer peacefulness of it all, before he finally fell asleep.
...
"Ahh.." Is what Belphie woke up to- Sometime later.
He was pretty out of it at first- Wondering what was going on.
What time was it? Was he still in Mammon's room? Why did he feel so hot- What had woken him up? Why did he feel turned on..?
"A-Agnh~"
He snapped out of his daze pretty fast.
His eyes trailed over to the figure next to him- The one who had made such an seductive moan.
There was his Oni-Chan, Mammon, eyes closed and mouth open- Clutching the sheets. Belphie could feel himself grow in his pant- Ah, shit, was he hard?
Belphie's eyes snapped downwards at the thought- ..Oh fuck. He was right in-between Mammon's legs..
He tried to make sense of the situation, before coming to the most likely of conclusions..
It seems.. That Belphie had started gr-grinding on his b-brother in the middle of the night, probably due to an e-erotic dream.. And, due to that erotic d-dream, mixed with the g-grinding- It seemed he had given Mammon an e-erotic dream as well-..
..And so, thus was the current situation- Belphie had woken up hard and in-between Mammon's legs- And Mammon was having a seemingly very pleasant wet-dream.
"M-Mm.." His Oni-Chan whimpered again, shifting around- Belphie could feel himself rub against Mammon's ass.
..Fuck, had Asmo placed a curse on him?- He'd felt hot- H-He wanted to touch Mammon..
He unconsciously grinded against his brother- Caught up in the moment. He soon realized what he had been doing in terror- He quickly pulled away.
Mammon was going to kill him!--
"A-Agn.." Another mewl- Quiet and wanting.. Belphie's sleeping Oni-Chan had backed up, pushing their bodies back together again.
--..Or not?
Belphie bit his lip and decided to try and get a good look at Mammon's face- What were the chances of Mammon waking up?
Finally, he was able to take a long, hard, stare..
"A-Ah.." There his Oni-Chan was, in all his glory, drooling and whimpering as he trembled in the clutches of an erotic dream- A heavy blush coating his dark skinned face, it complimented his features beautifully- His white hair was messy but it made him look just that much hotter..
..Mammon was so expressive- Seductive.. Belphie could feel himself wince as his pants become ever so tight- He took a quick look down, to see if Mammon had grown hard as well.. His Oni-Chan had. Belphie could see a bulge at the front of his Oni-Chan's tight pants..
"A-Aah~" Another whimper, just as alluring as the last.
Fuck.. Belphie could feel the chills go down his spine- And right down to his dick, which was throbbing ever so painfully- His Oni-Chan was way too hot, even for his own good..
Belphie couldn't just stay there- H-He needed to do something- He wanted to- to touch his Oni-Chan.. It was his fault they were like this, right? It was only fair he took responsibility..
"M-Mammon?" He asked, wearily- Only getting silence in return.
"Mammon." He said a bit louder, shaking the second born a bit.
"Mammon!" He said one last time, shaking his elder brother a bit more.
No response. His elder brother was sleeping like a log- This meant Belphie would be able to touch him all over- C-Cough cough, he means, just enough to satisfy himself and his Oni-Chan.
Belphie look a quick glance around the room- Nothing was out of place, everything was quiet- It was still very dark, no one should be up at this hour..
He carefully placed a hand on his brothers abs- Fuck, they were rock hard.. God, Belphie never knew he was into abs, until tonight. --He softly trailed his hand upwards- His brothers pecks were quite nice as well.
Belphie lightly pressed onto one of his Oni-Chan's nipples- "A-Ah.." His brother moaned, Belphie He bit his lip and pressed a bit harder- Applying more pressure, before deciding to do a quick thrust between Mammon's legs- They were both clothed, but Belphie could still feel the addictive friction.
No response- Well, not a concerning one, anyway. His brother whimpered again, which made Belphie hornier- But there were no signs of awaking. Belphie started to get more more confidant- His brother wasn't waking up- And he was moaning! He was surely enjoying this- right?
He thrusted again- This time he aimed to hit his brothers dick- "Agnh~" Bullseye.
He kept going- Building up the knot in his stomach- Before finally he couldn't take it. He wanted to get closer- He wanted out of his restricting clothes.. He wanted to feel Mammon.
Desire took over his being- He stripped himself along with Mammon. It was bliss- His Oni-Chan was warm and soft- Smooth as silk, and thicker then any demon Belphie had ever seen..
"Oni-Chan.. Oni-Chan.." Belphie whispered- Rubbing against the older's entrance. He wanted in- How nice would his Oni-Chan feel from the inside?- Mm, and he'd be the first to ever be in there, wouldn't he? His Oni-Chan was straighter then a ruler.. Belphie would be the first one to ever enter, even Mammon himself wouldn't have touched here before him..
It would be soft and warm- He'd be fucking his Oni-Chan, he'd make Mammon his- He entered his elder brother with an impulsive snap of his hips- He came immediately, at the tight bliss.. But he also immediately re-hardened, god- His Oni-Chan was so good inside..
"A-Ahh! S-St-Stop.. A-Agn- H-Hurts-!" Mammon cried out, twisting and turning- He was crying..- Belphie froze at the sight.
He didn't want to h-hurt Mammon- He- He hadn't b-been thinking! Fuck- Oh god- Shit!
"N-No more.." His brother pleaded, making Belphie's heartbreak- God, what the fuck was wrong with him? This was Mammon, his big brother!
..But it felt so good- Mammon was still wrapped around him- The heat was still there and the previous expressions and moans Mammon had displayed were circling through his mind-
"Oni-Chan is too seductive.."
He grinded against his Oni-Chan- He felt bad about it, but he needed to release- he- he wanted to- so badly..
Suddenly- Everything got quiet- Too quiet for Belphie's liking.
"..Belphie?" A quiet and tired voice- Poor Oni-Chan, he sounded so tired..
HOLY SHIT WAIT A FUCKING MINUTE MAMMON WAS FUCKING AWAKE!
"W-What's.. Going on?" Mammon asked, trying to turn around- Belphie promptly freaked out. "M-Mammon- G-Go b-b-back to s-sleep!" He stuttered as he tried to still his movements as much as possible.
"Mm?" He brother simply hummed, unaware of the position they were in- Belphie could tell his brother wasn't going to listen and would try to figure out what was going on..
"Sleep." He spoke after a quick thought, touching his brothers forehead- It drained him quite a lot: Using his powers on someone as powerful as Mammon took a lot more energy to force asleep then your average demon.
Still, due to his Oni-Chan's trusting nature- The second born immediately fell back asleep.
Belphie sucked in a breath of relief and shuttered- Thank god that worked- God knows he be absolutely fucked if Mammon were to actually wake up..
"Good boy." He stated- In a joking manner, despite the situations seriousness.
"M-Mmm." His brother unexpectedly agreed in his sleep- Tightening on Belphie's cock- Oh shit, Belphie had forgot he was still inside his brother..
He couldn't help but get excited again- Mammon felt so good.. His Oni-Chan wouldn't wake up if he didn't go too hard, right? ..And- H-Hearing that moan.. Was his brother into.. Praise?
Fuck.. That was so adorable..
Belphie continued his previous movements- Slowly but surely picking up the pace- It was too late to go back now- He at least had to finish..
"A-Ah.."
God, Mammon was so expressive- So sexy..
He gently took his Oni-Chan's face and guided it towards his own- His Oni-Chan had gone back to being a whimpering, pretty little slut.
More drool going down his chin.. Mouth open, more saliva on his tongue- Cheek's flushed and features delicate- Pretty, such a pretty Oni-Chan..
Belphie took initiative, kissing Mammon- Dominating his elder brother's mouth with his tongue, enjoying the moans that his brother let out because of their heated and passionate kiss- His Oni-Chan tasted sweet, yet unique- It felt wrong but tasted so good.. Like a forbidden candy.
He let his brother go, enjoying himself as he thrusted into the other quickly- The velvety walls now took him in with no complaint- every snap of his hips was bliss for the both of them.
"A-Ah~" Mammon mewled, crying from the sheer pleasure that was forced upon him.
"Oni-Chan.. Do you like this? Mm.. O-Oni-chan? G-Getting fucked by your little brother?" Belphie asked, intoxicated by the reactions his brother had to his words- It was just too cute.
Belphie wanted his brother to call out his name- He wanted Mammon to beg him for more- Maybe next time.
Oh? ..About that, actually. A 'next time' didn't sound to bad..
"A-Ahh~ P-Please-"
Belphie's eyes widened- ..His brother had just begged- A renewed sense of lust took over him- He snapped his hips as fast as he could-
"Good boy-, Good boy, good boy- Such a good Oni-Chan, so amazing- So pretty and adorable.." He whispered into his brothers ear as he thrusted and fucked into his Oni-Chan with all his might.
"I love you." He bit his Oni-Chan's ear-
"A-AaH!" Mammon all but screamed as he orgasmed- Clamping on Belphie so hard that Belphie forgot how to breathe- Belphie soon came as well, his high-as-the-sky bliss soaring through the air.
..Oh yeah, he'd definitely have to do this again some time.
He cleaned himself and Mammon- Putting back on their clothes and making sure nothing stood out from the ordinary- Before climbing back into bed and snuggling his Oni-Chan as if Mammon was his own personal body pillow.
"Good night, Oni-Chan.." He smiled contently- Before going to sleep much happier then ever.
Mammon woke up a few moments later- He looked around in confusion, but didn't sense anything out of the ordinary..
Weird.. He remembered waking up a little while ago as well, but he couldn't remember why..
He looked over to his contently sleeping little brother, who was latched onto him. It looked like Belphie was feeling much better now.. That was good.
Mammon furrowed his eyebrows but ultimately decided that it must've been a weird dream or something- If it happened again, then he'd start to get suspicious.
But it's not like Belphie would do anything to him, so there was no need to worry.
"..Good night, Belphie."
He succumbed to sleep.