"Slime X Diablo"

*SMUT one-shots*

The moment the arc demon saw Rimuru, he knew he found his destiny. As a demon, nothing gave him purpose nor satiated his desire. It was the trade-off of the gods. Without purpose, a demon was as good as an angel without will. No one was powerful enough nor worthy enough of his services, no one could summon him as master.

Until a little slime sent a call…and became his one true Master.

And a certain skill with a mind offered a diabolical plan to please him- (Yaoi)(Mature)(SMUT)

*In later chapters, will be a DOUBLE LIFE. Yaoi and hentai. Chapter one is just yaoi tho.*

TWO stories in one after chapter one:

Demon overlord topped by vassal in chap 1.

Demoness Housewife with human on earth hentai while demon overlord yaoi on tempest will start in chap 2.

—

Set in Tempest. After the great battle in the heavens AKA after beating up Yuuki kagurazaka/Velda battle.

A certain dark demon trailed behind as Rimuru took his usual stroll around town. While the slime turned man waved to little goblin children, the demon mused to himself about how he got to serve this miracle.

Diablo could still remember the day he was named…

A petite young man stood under the lights of the lanterns, the warm glow reflected in his large innocent eyes. A wind carried the songs and laughter of the festival as it blew his long blue locks behind him, shimmering and waving gently as his aura. His slightly askew smile as he accepted the devil's offer struck a chord in his heart.

The laughter and song of his people were the essence of this man — a god of peace, merriment and family.

Diablo thought, My Master will be a true king of gods.

Diablo couldn't look away as euphoria filled him up at the radiance this young man's very being gave off.

"Your name is…Diablo."

Then the power overwhelmed him as he evolved…wave after wave swam in his core as darkness raged and danced around his whole body. He never thought he'd be able to find the power to evolve for a few millenia. Thinking back to the hunch that made him accept the young man's summons, he could only shiver at his good insight.

When he finished gulping down the delicious energy, the devil faced the young man and bowed solemnly, "Arc Demon Diablo at your service."

Diablo found his destined master.

Rimuru Tempest, I shall be yours until the very end.

Later on, when Rimuru faced that damned Yuuki, Diablo could only watch helplessly as Rimuru was hit. The battle between this world's savior and it's destruction manifested was the closest he got to feeling true fear in battle.

After Rimuru was forced into the future by that bastard fake god, Diablo lost his mind and he could feel his power rampage around him. Like the others on their team, he wanted to rip that smug smile off the "Veda's" face!

Milim cried out as she raged, "Where did you send my best friend?!"

He chuckled. "Not where. When. Hmm? At the end of the world."

Diablo only saw red then.

One by one, they attacked together. As soon as he threw all the power he had forward, Rimuru popped out of nowhere — right in the line of fire.

RIMURU! Diablo was about to teleport over and block when Rimuru simply…ate it all up. Every single atom of power slurped like ramen. And he had the balls to laugh.

While everyone else cheered and questioned him, Diablo felt a dark urge to half-strangle, half-hug the optimistic and incurably oblivious grown man before him.

Fuck. Fuckfuckfuck. My heart can't take this. I need to tie him to me eternally so I may follow wherever he goes no matter how many Yuukis are born.

The usually composed elegance he wore as a facade slipped for that brief moment and he's never been the same since.

Unbeknowest to both Rimuru and Diablo, a certain skill was analyzing prospects and noticed a crack in the mind of Diablo then. It computed the possibility of its plan then. Synchronization.

—

—

Later on at Tempest…

Rimuru lazed about the inn as Diablo sat upright next to him making tea.

After the final battle, Diablo mused as his eyes burned the blue-haired god's body to his memory. He's certainly aged a bit. Does this mean he's fully formed? He's…an adult. Hmm….Red eyes burned at the man's long legs in the sun as he laid back in his shorts muttering about summer food ideas.

Rimuru gazed up at the sky while he mused aloud, "What do you think of watermelon cubes in sweet tea? I don't believe Milim has tried high-grade chocolate yet. They would love mochi as well…" His little pink tongue darted along his lips in anticipation as Diablo stared.

"Hmm…Succulent."

—

—

Another day, the two were in his room relaxing before a pair of oni barged in and chaos ensued.

Diablo rubbed his brow before grabbing a shirt. His rivals were increasing. He sighed as he folded Rimuru's clothes while Shion and Shuna fought over Rimuru's slime body again.

Shion cried out as she squeezed the blue blob in her ample chest, "I'll be his wife!"

Shuna pulled back, stretching the slime. "No, me!"

Unfortunately for all of us, he's genderless. Well, even if he chose to be male, I'd be find with it.

Just then, Milim came to join the fun with Ramiris and Chloe "happened" to stop by.

If only…

—

—

Later on…

Rimuru escaped the girls' clutches and proceeded to walk along the streets of his town, taking it easy. Whistling, he waved as people smiled at him. Yes, this is heaven. If I stayed back in the room though, his body would have turned into mochi! Though…the feeling of the women hugging him to their chests was so soft… "If this is heaven, I could live here forever."

[Agreed. If only you stopped looking at other women…]

"Hm?!" Rimuru gulped and just kept smiling while cold sweat started down his neck. His Raphael Skill had gotten more vocal these days…and jealous sounding? But she was a skill. Well, he did call her "she"….there was a "sheness" to the skill's voice…?

Just keep smiling, just keep smiling! "Well, while I'm sure Ramiris and Veldora have some trouble up their sleeves again, it's quiet right now. Let's embrace the peace!"

[Hmph! Deflecting, but yes, let's]

Why did Raphael sound like a jealous wife?!

"Ahahaha!" Cold sweat kept going down his neck. I feel like she'll start looking at my phone history to find hentai. Oh, right, that doesn't exist in this world - thank god! Or I'd be sooo caught.

Trying to distract her (well, technically himself since the skill was part of him), he pointed at the inn. "Look! Let's try this inn this time!" And with that he ran.

Later on at the hot springs…

Carelessly, Rimuru said, "Man, I couldn't be any happier! This here old otaku has made it to heaven. I'm glad I have you, Raphael-chan~!"

[…Otaku? A skill?]

Rimuru stretched his arms as he took another swig of sake, "Nah. Just a phrase. Ahh…" He sunk into the hot water. "Yeah. All a man needs is alcohol and a pretty view. Like those elves…."

Raphael's voice darkened, [Hah? Elves?]

Rimuru straightened his back and squeaked out, "Eep! Nothing! I'm not a bad slime, I swear!"

And like that, they enjoyed their drink in the hotsprings…

Except Raphael had one issue.

Deteremined to find out what otaku was and if it was another skill she could add to her collection — er, to help Rimuru, Raphael searched through his memories…and discovered the secret behind his beloved PC. The skill paused while 'she' watched the human Rimuru in his earth memories laugh with friends over the 'hentai'.

[Rimuru has friends, land, power, trust and a beautiful country in his heart. The only thing missing is his love life — but no woman shall take my spot!…..I must compute the best method for Rimuru's happiness.]

And, for better or worse, Raphael started analyzing every piece of otaku culture found in his memory. [The secret scrolls of his memory will tell me the key to his happiness.]

The only con? Every ad, every fujoshi friend's book they begged for reviews, every otome game commercial, every curious read just for curiosity's sake (he promised!)…also landed in his memory. And Raphael spared no corner.

[…! Body possession…yaoi…oh. Oh. No women here. Topping seme? Futana-ri? Human organs that provide sensual stimulus….Optimization….]

Unfortunately for the demon lord slime, his partner in crime had just opened pandora's box.

A dangerous world has opened up to the universe's most powerful skill.

After several minutes….

[….Done. Now I need a candidate and I won't let another woman enjoy my lord….Hmm….]

.

—

—

Diablo had a dream that night despite his lack of need for sleep. For some reason, he felt immeasurable sleepy. A soft voice entered his thoughts, "Diablo?"

Diablo wanted to fight it, but the feeling was too powerful. Who dared leak into my mind?!

"Do not worry. It is I, Raphael. I believe you know I exist within Rimuru."

"Ah!" Diablo relaxed his mind and questioned, "Why are you doing this?"

By now, he was in full sleep mode and 'spoke' to the emptiness in his mind. Just then, a soft golden light emerged from the darkness and took the form of a angelic form of Rimuru. "I need your body."

Then she whispered her plan to pleasantly surprise a certain slime…

Meanwhile, in his room, Rimuru fell asleep without worries. "I guess I'll be a grand sage for the rest of my virgin life…" He chuckled. Whatever. He was happy with loved ones so that's all that mattered.

Unfortunately for him, Raphael had different plans…

—

—

In the dark of the night, a certain slime demon lord slept peacefully in his traditional tatami mat room. The full moon shone bright as leaves scattered past his window, a visual dance of light and shadow.

All was well in Tempest.

Yet the man's brow scrunched. A soft voice whispered in his mind…

Rimuru…Lord…

We have a present…

Rimuru eye's snapped open, but the first thing he noticed was his chest. It felt heavier…and it ached.

He looked down and saw two small mounds lift his shirt! By reflex, he plunged his hand down his pants and sagged in relief. Good. He still had his friend down there.

Wait.

He never had a friend down there or up here since being reborn?! And why did he feel hot…? Was this a set up for those manga?!

Just then, a sultry deep voice spoke, "Master."

Rimuru looked up to see Diablo suddenly standing in front of him as they floated in his secret space without time or limits. A space no one could enter without his permission. And he didn't even realize when they came into this space.

Was Diablo always this powerful? It's like Itachi from that Naruto anime pulled me in a genjutsu…Still hazy and hot, Rimuru mentally escaped into the world of anime before he snapped out of it.

Just before he could ask what was going on and why he had boobs, a glow came over the handsome demon and Rimuru felt a presence leave his consciousness. Then Diablo's dark hair grew longer and longer until it hit mid-chest and his dark eyes held a golden spark within.

While Rimuru analyzed the demon, Diablo was busy adjusting to his new state. As planned, when Raphael's consciousness moved from Rimuru to Diablo given their thought channel, 'she' could see her lord below her and then moved their fingers. As they spoke, a tint of angelic tone echoed in Diablo's dark velvet voice, providing an ethereal attraction just at the sound. "Master. I, Diablo, have allowed Raphael-san to share my body so we may service you. We are one in sense and mind in this state, but do not worry, she is not lost to you. This is only temporary at her will."

"E-E-Ehhhhh?" Rimuru froze. "But I feel the power in me?"

"Correct. We share the body, but Raphael only moved her consciousness to mine. All of the automated parts of her skill still reside in you, do not worry. We have brought you to this space as we need privacy to pleasure you without our rivals - erm, friends watching. And they are always watching."

"Not always."

"Always." He sighed at his master's lack of awareness. "Even if not physically, then most definitely through other means. You have many fans."

He bowed and stepped closer to the tall god that was more beautiful than any goddess and continued, "Master. I have heard the story from Raphael-san. She heard you missed 'Otaku' culture….and we found out a lot of it is revolved around love. At her request, I humbly allowed her access to the flesh of my body as she updated yours to allow for greatest pleasure and love. Perfectly optimized for the greatest sensations via her calculations."

"…" Rimuru started to think how the hell Raphael and Diablo got this idea. "But I'm not that Guy demon and how did you find out — wait…"

"Ah, yes. She accessed the sacred texts of manga in your memory and made sure to research every topic."

"…!" Mortified, Rimuru cried. Th-They saw his collection of his hentai! His pride was gone! Like a ghoul Rimuru slumped to his knees. SO EMBARRASSING!

"Master? Are we not…good enough?" There was a sad strain to that beautiful voice.

Rimuru instinctively looked up and at first saw an impossibly stunning face tear up above him. That's when he took a good look.

Tall, composed and draped in a simple silk black robe that gave a stark contrast to his pale alabastor skin and muscled eight pack abs. The collar of the robe slipped enough to see a bit of each shoulder and just down to his hips. Despite the strong stature, his eyes held a elegant slope and his face almost seemed drawn from a painting of divinity itself pulling him in with his magnetic attraction. Silky black hair trailed down his chest and framed his face seductively. Diablo had the face of an angel, perfect without flaw, but an eroticism exuded from his body like a kitsune fox spirit from japanese folk lore.

Rimuru gulped. He really was an oni to suck a man's soul.

"Raphael," He looked at Diablo. "Why do I feel hot?" The only one who could allow this was her.

Diablo/Raphael pouted a tiny bit and Rimuru felt his heart pound. A tinge of a robotic tone entered the demon's voice then. [When I temporarily changed your body into the ultimate human form for pleasure, it automatically released your sense of libido. It seems after years abstaining for your 'grand sage' training, it's all coming out at one time.]

"So basically, because I have a dick again and was holding in my libido for so long, I became so horny that I can't stand right?" Just kill him now.

"Correct."

"So this is a futanari? Male and female parts." Rimuru already guessed what happened next. He squeezed his not so large, yet not so small boobs. What otaku hell did Raphael brought up? This was his fault for not destroying his PC…not that it would matter…

[Yes. Apparently, the ultimate human form to enjoy pleasure at the extreme. But I do not want any other female to have my lord so this was the best form. This way, you may experience the height of the human connection to both hentai and yaoi. I also noticed your training as a grand sage required your purity, so I kept the body as a virgin.]

Diablo rubbed his chin and mused at the answer that Raphael passed through his own lips. He never really considered what humans found pleasureable as he dealt with pain, but…if it made his master feel good…."I see. Formidable research as ever, Raphael-san."

Rimuru sweated. "Uhh….I think that's not quite right…" His imagination ran wild.

Diablo gently kneeled next to Rimuru's fallen form and held his lord's soft face in his palm. His face had a little charming bounce to him. He rubbed his thumb across his cheek and Rimuru instinctively closed his eyes a bit into the touch. "Cute…"

On his part, Rimuru saw an otherworldly beauty nose to nose with him and breath skipped. He could feel his face burn and a shiver ran down his spine into his gut. "Gulp!"

Diablo went for the kill. He leaned in a bit closer to his ear and whispered, "Life is too short. Would you allow me the honor to let you taste ultimate ecstasy…?"

Rimuru's eyes went a bit hazy in lust and his heart of two lifetimes of sad virginity skipped a beat. Damn it. I can't believe I'm doing this…

The slime lord simply blushed and looked away. His blood pounded, his heart burned, but most of all, he felt he couldn't let this opportunity slip by. Softly, he whispered, "Come."

Diablo's eyes dilated and a smile spread across his face before he leaned in for the kiss, "With pleasure."

Their tongues entagled as fire ran in their veins with every touch. "Mm…!" Diablo's long tongue licked the roof of Rimuru's and he explored every corner. His large palms scooped up Rimuru's bottom onto his lap and Rapahel conjured a bed beneath them, floating in space.

Landing in plush sheets, Rimuru's pajamas were thrown off and Diablo ran his palms down his back and up his upper thigh in one motion.

Raphael's consciousness merged with Diablo as one at this time while they focused on activating all of their focus on their lord's erogenous zones.

Diablo nuzzled his face between Rimuru's newfound breasts as he squeezed them together in his palms. His breath against the slime demon lord's skin sent shivers down to his gut and he moaned. Squeeze. Squeezeee.

Diablo ran his tongue over one nipple and sucked while his hands ran down that soft and curvy body and over his ass as he squeezed that round, plump flesh hard.

Rimuru gasped as he bit into Diablo's shoulder, his mind losing to his lust. He felt his ass being squeezed and he pressed his chest into Diablo's mouth. More. He needed more! Just then, two fingers plunged into his hole and began moving inside him.

Faster and faster, they stroked while more fingers were added. Diablo breathed hotly into Rimuru's ear as he whispered, "Nn…So it seems flexibility is another skill, my master. Do you feel me? Do you feel me inside you?"

Rimuru gasped as he breathed harder as his bottom became wet.

Diablo continued his ministrations and a long while passed before he deemed it was wet enough.

The demon looked into Rimuru's eyes as he said, "Rimuru. My Rimuru. I will give you ecstasy."

And with that, he held Rimuru's long legs above him as he began to enter, the thick mass slowly penetrating that entrancing body. "Hah…Nn…Rimuru…" His voice grew deeper and darker. "Hah. Mine. My Rimuru. All mine…"

Rimuru gasped as his body spread open to accept that long object. He could feel a long probing thing enter his body for the first time and he couldn't stop moaning. He may not be affected by pain, but he definitely felt pleasure. Even so, Diablo was careful to prepare his entrance.

Deeper and deeper, Diablo plunged in Rimuru's soft body. He didn't want to miss a single second of Rimuru's enraptured face.

Thrust. Thrust. Thrussst.

Faster and faster, his large thing plunged in Rimuru's bottom, his flesh clinging tightly to his member as he felt every rub, every friction, every pounding of the tip against his core.

Rimuru moaned loudly as Diablo slid his large palms to either side of his hole and spread the flesh of his inner garden apart while his member rammed inside. Slippp, thrussst. Ram.

The blue-haired man tossed his head back as pockets of air mixed with the sensation of that big, veined thing ramming in his body, the result of which were loud sounds of fluids and skin echoing in the air. Splurt.

He could feel that tip and length thrust in different angles and curved at the end. He felt his ass bouncing off that dick with every plunge and his whole body surged with electric shivers.

"Ah! Ahhh! Ah, ah!" Rimuru's high cry pierced through the night as Diablo grunted and lifted the slim man up so he now bouned off his waist from the top.

The demon's eyes darkened as he watched his master's ass move on his own, grinding on top as he bounced. He grabbed his thighs and plunged deeper into his tight body.

With a lick, Diablo watched as he made sure to circle his hips around to swirl inside Rimuru's tight ass. His hands slid up and down that slender form as those bouncing mounds on his chest danced about in his palm. Every touch was fire on Rimuru and when those hands slid to hold his member, he cried out.

"Nnh! D-Diablo it's…too much! Ahhh!" Rimuru felt his length held in one fiery palm as long fingers wrapped around him and pumped. Up. Down. Up. Dooown. He even rubbed his large thumb on the tip of his member and Rimuru couldn't help but release.

White splurted on the sexy demon's chest and the large man chuckled deeply. "Fufufu." He licked his thumb with a long tongue. "Tastes delicious." His dark eyes ran up and down the pale slime lord's body.

Rimuru shivered under the gaze as the heat grew. It felt like an inferno raged in his chest and his bottom grew more wet. Instead of satiating his desire, he felt greedier. More. I need more.

Long into the night, the two melted into each other's embrace as the demon pounded the god in the bed.

Harder and harder. Longer and rougher. Nothing was spared.

Finally, when at last Rimuru could feel the heat finally dissipate and his body turned limp, Diablo gave one last thrust and they moaned.

"Diablo! Ahhh!"

"Rimuru! Nh! Master!"

The arc demon shook as he splurted all he had into the slightly smaller body. His strong arms encircled that thin frame as the blue-haired man screamed in ecstacy.

At last, they both collapsed in bed. Before long, Rimuru could feel a certain consciousness return in the back of mind. He didn't know why, but it always felt like Raphael had a separate "presence" there.

The two just lay there in each other's arms as sweat dotted their backs and slowly their stamina started to return due to their high regenerative powers.

Several minutes passed before Rimuru found the strength to speak. "Good thing time isn't an issue here. I need to make sure I'm there in the morning before Shion and Shuna panic."

Raphael answered first [No need to worry. Every session here in this space will automatically produce a doppleganger in your bedroom in Tempest. I learned from the ninja ways of manga volum — ]

Rimuru laughed, "God. You really think of everything Raphael."

[Hmph! Of course. And due to your lack of need for sleep in the first place, this method of stimulus will provide a healthier flow of hormones in your body and elevate your mood by default.]

Diablo chuckled as well before leaning on his elbow and resting his head on one palm. His other arm wrapped around Rimuru's waist as he rubbed his thumb in circles on his back. His smile wicked as he asked,

"Kufufufu. Shall we continue tomorrow night then?"

And with that, the demon lord of Tempest nights were set.

….

…

Meanwhile on earth…

A long-haired beauty knocked on an apartment door, her hips swaying seductively and her bust bouncing with every step. A pink tongue darted between her lips and for a moment, a tail whipped behind her before disappearing. Her eyes shone red before fading to black.

The door opened and a tall man who recently had an accident with a knife scratched his head. As a parellel existance, he was confused about the dark-haired beauty poised at his door wearing a flashy maid outfit.

"Kufufufu. Hello, dear. I am your new maid. I learned a new skill with help from Raphael-san. You may call me Lina."

She grabbed the man's tie and pulled him close. With a deep gaze, she whispered in his ear, "After all, you have an earth name, Rimuru-sama~ Why can't I? You can't escape me anymore."

Then she giggled and jumped to wrap her arms around his neck and they both fell back to the floor. With a whip of her tail, she slammed the door shut.

And…the rest is history.

Now all of you is completly mine.

My Dear Master.

…..[Agreed, Diablo]

…..

….

….

Author's Note:

WitchySkies here! Ok, ok, first off, I love Rimuru just as he is…..but I just HAD to write this. Diablo is my type and Rimuru is my fav so of course fujoshi-dom dictates one must adhere to one's calling.

LOL.

On another note, this one-shot is complete. But just like my other series of one-shots with One Punch Man "One Punch, One Night", if I add any more one shots with this scenario, Ima just add them to this here story ;p

I usually prefer the strong oblivious type to be pushed down by the 'delicate' looking types who are secretly powerful at first glance. I know, I know. It's my sin.

But with Diablo, that absurdly handsome arc demon turned higher evolution…I feel he can be whatever and I'd be his fan. So due to the Parallel Existance skill of Rimuru and Raphael, Diablo got it due to his new extreme connection with Raphael.

In other words, in Tempest, he's the top. But on earth, he's….well, he's still top, but as a full woman so he may blend in with Tokyo and play the 'married housewife' routine he read in the sacred texts. So if I do more one-shots, it'd be of both worlds at the same time cause that's what they are. Literally Parallel Existances. As this is 55% more smut than it is a full on romance plot, I'm going to let myself go.

So this series of one shots with Rimuru living a Double Life:

On Tempest: "Demon Lord God topped by his Vassal"

On Earth: "Otaku Life with a Demoness Housewife"

Lololol I'm terrible.

Let it go~ Let it goooo~

*Cough*

So follow this story if you want more one shots. And if ya want, leave a review :)

Onegai? Pweeease?

P.S. Just realized. Dude. This guy gets more action than Cupid and Aphrodite combined. So does that mean Rimuru isn't just a demon lord, but also the god of love?! Anyone else think so? Slime Lord of Love and Harems hahaha.

On another note, also updating my one punch series so check it out if ya into apocalypse yaoi reverse harem dramas with saitama.

Final note: I love y'all and hope we get a vaccine soon so we can all meet again. And eat crepes in Tokyo while running from deer in Nara.

Ok. Ok. Stay safe, stay sober (until it's 7pm and you are playing sad naruto music at home under the moonlight through your window like an anime protagonist who fought off Akatsuki), and eat ramen. With oranges for vitamins.

Peace, yo!