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It’s just a prank bro

Summary:

Benimaru needs an heir to continue his royal bloodline, his only options would be his sister or Shion, so he and Rimuru come to an agreement.

Rimuru accidentally but also on purpose eats benimaru’s cum and gets pregnant.

Notes:

This is my first fanfic ever so pls be nice :)

And I guess the obligatory I’m poor and don’t even own the clothing on my back so of course I don’t own any of these characters.

Work Text:

In a tea room in Rimuru capital city Benimaru found himself having a rather uncomfortable conversation with the old sword master Hakurou.

“So…” the old man said, calmly setting down his cup of tea, producing a careful clink as it came to rest upon its accompanying saucer. “Have you given thought to this… predicament?” He questioned, carefully selecting his words as the young kijin before him started to nervously grimace through his attempt at a nonchalant smile.
“Uh, He-he” he nervously laughed trying to break the tension.
“I was actually going to speak to Lord Rimuru later this evening about this…problem.” He said rather meekly.

“Rather presumptuous of you, don’t you think?” Hakurou said, taken slightly aback, “Of course, no offense Intended my prince.”

Benimaru could feel the blood rush to his cheeks as he processed what hakurou had just insinuated.

“N-NO… I would never insult Lord Rimuru in such a manner!” He frantically blurted out. “I merely wanted to get his input on the situation”

Seeming slightly relieved with Benimaru’s explanation Hakurou simply nodded and went back to calmly sipping his tea. “Let me know how the discussion proceeds next time we meet, it is of course imperative that you produce an heir, we cannot allow the royal bloodline to simply end.”
————————————————

Later that day

“My lord, I'm here to discuss, uh… a situation.” Benimaru said lightly tapping on the office doors leading to Rimuru’s office.

“Eh… Ah, Benimaru” Rimuru responded excitedly “come in, come in” he said beaming at the man before him with a bright smile.

“I’m not interrupting anything my Lord am I?” He asked, dipping into a low bow.

“Eh… no,” he said ignoring the giant stack of papers on his desk, seeming rather excited at the distraction Benimaru offered.

“Did you need something?” he said with a bright smile almost too bright for Benimaru to bear.

“Yes,” he said awkwardly while still bowing. “I’m very grateful for all your help after our village was destroyed, however there is still a problem I have and I wanted your input on it!”

“Right, so what’s the problem?” Rimuru responded, kind of nervous as to what it might be.

“As you know I’m the current leader of the ogres,”

“Ri-ght”. Rimuru let out cautiously, still unsure of where the conversation was headed.

“Well as their current leader one of my duties is to…”

“Is to what?” Rimuru interjected to break the pause.

“To produce an heir” he finally blurted out.

“Hmm, great sage,” he inquired aloud.

“Interesting”, Rimuru said as he engaged in conversation with Great Sage.

“My Lord,” Benimaru spoke in an attempt to capture Rimuru’s attention.

“Sorry sorry, I got lost in thought for a second, please continue.” Rimuru said with a slightly flushed face.

“I was simply hoping to discuss this issue with you as you can tell I haven’t seemed to make any progress myself.”

“Eh, well if it’s only the child you need I could make it myself.” Rimuru said rather Cooley. Although half joking he was entirely capable of doing so.

It seemed as though Benimaru’s brain had ceased to function as he froze completely, mouth ajar staring at Rimuru with a blank expression.
Several moments passed before any information was processed and Benimaru could react.

With a crimson face that could rival his own hair he began a near incoherent rant.

“ I would never dream of defying my lord in such a manner, please forgive my insolen-“.

“It’s nothing like that.” Rimuru said, secretly enjoying how flustered the prince before him had gotten. Hiding a mischievous little grin, Rimuru pushed a little further and decided to tease him a little.

“All I would need is some of your seed” Rimuru said in his best attempt at a sultry voice.

“Then I just eat it and a baby is made.” He said making a little O face afterwards. That definitely seemed to work, if benimarus face had been red before then it was practically glowing red at this point.

Rimuru flashed him his signature grin.

“So what do you think of my plan”
——————————————

Benimaru didn’t know how he made it out of Rimuru’s office but he now found himself spread out onto his futon still reeling from what he had experienced.

He had never thought of Rimuru as anything other than his Lord, the one whose strength he had recognized and pledged loyalty to.

However in that office he saw something that had completely changed the way he saw his Lord.
His usual sunny expression had been exchanged with a lewd expression that had seared itself into his brain. And he now had a decision to make.

————————————-

“Maybe I teased him a little too much,” Rimuru thought aloud to himself the next day. He had come to him very sincerely with this problem and Rimuru had taken the opportunity to mess with him. Maybe he should find Benimaru and apologize. He had left rather abruptly yesterday and hadn’t even let him apologize for the bad joke.
But seeing the usually composed ikemen so flustered had made every second worth it.

Rimuru’s sadistic fantasies of torturing his ikemen followers were cut short as he heard a knock at the door before the door opened and quickly shut behind whoever entered.

Looking to find the intruder Rimuru was met with a man whose flaming red hair matched his currently crimson face.

“My lord” he said quickly bowing before striding over to the desk where Rimuru sat, unable to meet the boy's blue eyes, the man quickly produced an object from his sleeve and placed it on the desk before rimuru.

Rimuru eyed the object, a rather large vial now sat on his desk, filled nearly to the brim with a viscous white liquid.

Rimuru looked up at the tall man in front of him incredulously, no way did he just put a jar of cum infront of him. But looking up at the fidgeting man who was struggling to not make eye contact made Rimuru certain it was most definitely his baby batter.

“Now what?” He said awkwardly trying to fill the awkward silence.

“Notice: The vile in front of you is a 4 oz bottle filled with—- “
“Eeeh! STOP!” Rimuru thought, forcing the great sage to shut up.
Wait. Heheheh. Rimuru had this one opportunity to really see the ikemen in front of him squirm in his hands and he was going to take it.

“Your hard work is done and mine starts now” he said with a suggestive grin.

Grabbing the bottle and psyching himself up, Rimuru made sure Benimaru was looking at him, quickly uncorking the vial before slamming it back.

The viscous fluid instantly coated his tongue in a pungent, musky, flavor that seemed to permeate through his entire being. Having to force down the fluid that seemed to fight back his tongue attempting to coax it down.

Rimuru lost in his objective of downing the vile almost seemed to forget about the currently slack jawed man watching him down said jizz.

“Gulp u-uh”
“Mmhh glug”
“Th-this is uff-uh a-lot.” Rimuru gasped out

Benimaru nearly had an out of body experience. Witnessing the man he respected the most in the world down a bottle of his jizz. This was something he hadn’t ever expected to see and if the sight wasn’t enough to send him into orbit the sound was damn near enough to send him to the moon.

Benimaru was transfixed, completely unable to look away.

“Beni-HIC-maru I f-feel weerduh” the young boy before him managed to barely slur out.

“M-my boodeeuuh feels sho hot”

“Benniiuuh” he moaned out.

The concerning behavior quickly made Benimaru snap out of his stupor and jump to action, scooping the smaller boy up in his arms and walking over to a nearby sofa.

“Notice: The high magicule concentration of monster sperm can lead to a state of feverish intoxication.”

“Mmm sho yummy.” Rimuru sputtered out as he lapped away at the last few drops of cum in the vial.

“Okay that’s enough of that.” Benimaru whispered worriedly, cradling the boy's small body in his arms quickly prying the bottle out of his hand.
As much as the situation had gotten him riled up earlier it had quickly turned to worry.

“Notice: Starting creation of reproductive organ compatible with kijin embryo
Notice: reproductive organ complete.
Notice: inseminating egg with acquired Sperm.
Notice:Insemination successful.
Notice: moving inseminated egg to uterus.
Notic: egg has successfully attached to uterine wall.
Notice: you have been successfully impregnated.“

“Hey, Beni… it woorked.” Rimuru said drunkenly, smiling.

“You’re baby’s gr-Hic- growing in heeruh.” The small boy said while lazily rubbing his belly, smiling up at the large man cradling him in his arms.

The news ran through benimarus body like electricity,he was going to be a dad and Rimuru was carrying his baby. He looked down at the beautiful boy slowly dozing off in his arms.

A gentle smile crept onto his face.
Slowly leaning down he planted a soft kiss on Rimuru’s forehead. Moving his hand up to Rimuru’s face, Benimaru gently thumbed over the boy's bottom lip before planting one last gentle kiss on those beautifully pale lips.