The Underground - September Rule 34 Story #1

Story by GrifterWolf on SoFurry

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#80 of Patreon

Guin is somehow transported into a deep underground cavern where he meets the ruler; a fellow beast man with an eye on him.


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"The Underground"

It had just passed the hour of twilight as Guin entered the thick forest; the sounds of someone singing in the distance had lured him away from his campfire, and now he had become impossibly lost in the dense trees. The warrior had left his cloak and armor when he'd stepped away, and was dressed in a simple pair of trousers that brushed against the bushes that he'd passed. His eyes were sharp in the darkness, but even here; everything seemed to be pitch black for him. He had made a wrong turn; that much was obvious, and each time he thought he found a path that would lead him back to the main road, he found that it only led him deeper into the darkness.

The warrior was no stranger to facing the darkness; but in this literal sense, he was rather overwhelmed. He scratched the back of his leopard head in confusion as he more and more cautiously made his way along the ever-eroding trail under his feet. He didn't get lost; it was not in his nature, he always found his way. This must be some sort of a trick; he reasoned, some villainous plot to lure him into the darkness and to never be seen again. He frowned as once again, he turned a corner and saw that the trail led downward. His camp site was near the top of these hills, but finding nothing but downward trails had a dangerous foreboding that he was not prepared for. The air smelled stale here; humid and cold as he hesitantly continued to follow the trail before him. After about fifty feet down, the descent became increasingly sharp, and it was clear he was not going to find his journey here. He turned and started to head back, only to find a mass of roots directly behind him, blocking his path as though they had been there all along.

"What is this sorcery?" He asked himself.

A foul feeling crept up Guin's spine, making the warrior shudder where he stood. If his entire body had been covered in fur, it would all be raised up, but in this case it was mostly the hair on his forearms that delivered the tingling sensation. Evil was abound; and Guin knew he would need to fight through it. But he only had brought a dagger along for his protection. As his fingers wrapped around its hilt and he began to draw it from his belt, the slope under his feet suddenly became extremely slippery. He crouched low to prevent himself from sliding, but to no avail; and Guin's feet began to slip along the mud without control. He rolled to his side, falling to the ground to try and keep his body from slipping down the slope, but somehow it felt like his entire efforts were being subverted by an increasingly sharp angle. He reached up to grab the base of a tree, but his mud-soiled fingers slipped on its smooth trunk and he suddenly began to fall almost vertically down the hill. Guin slammed his dagger into the ground, stopping just short of a distinct hole that had formed at the bottom of the hill that was ready to swallow him up. He could feel a cold gust of air under his feet and tried to pull himself up on the dagger alone.

As Guin tried to pull himself up, he realized that the mud layering his fingers made the dagger's handle much harder to grasp, and soon they slipped away as well. Guin slid five feet further and through the gaping hole in the earth and into complete darkness. As he fell, the leopard man looked up to see the hole in the earth seal up with roots before the light completely vanished from above and he was falling through blackness.

It took several minutes for Guin to fall before he finally met a massive pool of water. He barely had a chance to hold his breath before the waves crashed around him, the impact causing an instant blackout, he lost consciousness.

"Nnnhh..." Guin could hear his voice echoing slightly as he came to. Opening his eyes, he could see he was shrouded in the light of candlelight, causing the shadows above his head to dance around as he placed a hand on his head. "What...?"

"I'm glad you're awake." A voice alerted Guin's attention and he bolted upright, striking his head on a low-hanging rock just over his head before a hand forcibly pressed on his muscular pectoral. "Easy now, friend. You have been unconscious for several hours."

"W-where... am I?" Guin asked as he laid back slightly. The large hand rested on his chest for several seconds longer than necessary before it pulled back, returning a moment later with a damp cloth, which then was used across the warrior's forehead. "Who are you?"

It was a male figure that moved in the darkness, as it leaned forward; Guin was shocked to see an animal man emerge from the shadow. He had white fur and a golden mane upon his face; and kind eyes that rested several inches under his thick, curved horns. "I am Asgore." He said. "I rule the underground."

Guin glared at the beast and again tried to move, but Asgore's firm grasp held him in place. "Are you responsible for bringing me here?"

"There are many holes that open to my realm." He explained. "But I cannot control them. I found you lying unconscious in the lake and brought you here in the hopes you would recover. I don't mean you any harm, warrior."

Guin stared conspicuously at the man and relaxed once more; admitting to himself that he was still in some pain from the fall. "My apologies. But the method of me being brought here; it seemed that nature itself was my enemy."

Asgore chuckled lightly, continuing to administer the wet cloth to Guin's forehead and bringing it further south, over his body. "Well, I am not nature itself."

"But you rule this place."

"I rule the denizens of this realm; New Home. But I have no say in who comes or goes."

"I see."

The beast's eyes almost glimmered in the candlelight as he observed the leopard man's body. "You seem to be a sturdy warrior." He said. "I find it hard to believe you simply fell here."

"That's what happened." Guin responded sternly, crossing his arms, only prompting Asgore's cloth to slide even lower, toward his stomach. He grunted and pulled back. "Hey! Just what're you doing, you pervert?"

Immediately, Asgore dropped the cloth. "My apologies." He admitted, sounding somewhat flustered. "I just--erm..." He chuckled nervously. "Mostly we encounter humans who fall here, it isn't often that we meet monsters from the surface."

"Monster? I am no monster. I am a human..." He cupped the leopard head. "This is just an enchanted mask--" He froze as Asgore placed a hand on both sides of the head as well, staring intently into Guin's eyes. Guin froze and watched as the beast's eyes followed his own.

"Hmm... this is no enchantment." Asgore admitted. "I can sense the heart of the beast within you...Guin."

Guin's eyes widened a bit. "How...how do you know me?"

Without much conscious effort, Asgore released Guin's head and reclined back, revealing that he too was quite massive and muscular. It didn't take much for the leopard to glance him over. "I can see your spirit." Asgore said. "A fighter to the end, yes? Not like any human I've ever encountered."

"When can I return to the surface?" Guin asked.

There was a pause and Asgore turned his eyes away. "I don't know." He said.

Guin frowned in frustration before moving to get up. "If you do not intend to help me, then I will find my own way back."

"No, wait, stop!"

Guin had already stepped from the alcove he shared with Asgore and looked around the main cavern he now found himself in. His ears could pick up the sounds of running water; it did not seem to be far away. The place he fell must be around here somewhere. He stepped down onto a rugged rocky floor and began to look around. Lit by torches, it was easy to determine that there were paths that led to and from this place; he just needed to find a way back to where he'd fallen, and he might be able to find a way to return--

"Oomph!"

Guin grunted as he was tackled from behind and fell to the floor again he looked up to see Asgore sitting on top of him, a large pitchfork held over his head that he stabbed down toward the leopard's face. Guin narrowly stopped its descent by grabbing the fork, holding each prong between his fingers as he fought back the beast's strength. "You must not leave! It is not yet time!"

"Time for what?" Guin grunted, feeling his strength would outlast that of the ruler of this underground kingdom. "Why do you attack me?"

"Your soul is so very strong. I must have it to break through, I must get to the surface!" Asgore had a maddened look to him, his eyes were glowing red as he tried to stab the weapon down even harder. Guin's muscles tensed and with a forceful throw, he managed to knock Asgore off of him. Asgore swept the pitchfork at Guin and the warrior simply grabbed it and pulled the beast into his body. Their chests slammed together, and for a brief moment their lips passed within inches of each other. Asgore released the weapon and Guin threw it off into the darkness on impulse as the other beast grabbed him and tackled him hard into the ground. Guin cried out in pain as Asgore pinned him under his body.

Guin growled as he felt his body pressed under Asgore's weight; the warrior was almost a head taller than him, and twice his breadth. He felt the beast's soft fingers slide along his muscle from the top of his chest to the lower part of his abdomen, and he couldn't help but feel aroused by it. "My... my need is insatiable, leopard... please, if you wish to return to the surface, you must indulge me."

"Is that so?" Guin said, struggling. "I am not that easy to tame!"

Guin pulled his legs back, twining them around Asgore's body and coming to a rest against the beast's stomach. Guin then kicked hard and felt Asgore fall back; wrapping his thick arm around the horned king's neck, Guin recovered quickly and locked the man's neck into the crook of his elbow. Asgore punched into Guin's stomach violently and the pair fell again to the ground. Wrestling along the rough, rocky surface until they were again face to face; with Guin's body resting on top of Asgore's and two breathing heavily into each other's faces.

Guin didn't know what came over him; the softness of Asgore's fur, the exhilaration of their brief quarrel or some strange sensation that washed over him from this new realm, but Guin found himself suddenly dragging his tongue along Asgore's chest; making him growl in ecstasy as he did so. Guin tightened his grip on each of Asgore's wrists, using his body weight to hold the beast down, but he wasn't sure for how long he would be allowed to do this. As he reached the nape of Asgore's neck, Guin bit down and he heard a gasping moan from the larger beast, who suddenly regained his strength and nearly caused Guin to tear his neck as the two tossled to the other side, Asgore's massive body on top as Guin released the flesh and the king returned the favor, licking at his muscle in the same manner. Invariably repeating what Guin had done to him, Asgore made the exception by then taking one of Guin's protruding nipples and biting his front teeth down on it. Guin hissed in pain, but he couldn't deny how it felt to have that done while the massive bulge belonging to the dragon--goat-like creature pressed against his own. It was then that Asgore's hands began to explore Guin's muscular body a bit more thoroughly now; through an awkward kiss shared between the warriors, Guin could feel Asgore's wandering fingers sliding down his body and pulling at his pants. Guin growled and moaned as he felt the waistband of his pants drag across his flesh, revealing his cock to the warmth that was radiating off of Asgore's bulge. Asgore himself wasted no time and tugged at his trousers to greet Guin's flesh with his own; a thick, massive meat that draped over Guin's thigh ever so slightly as it dripped across it.

Guin growled slightly and his arms found their way around the beast's back, pulling the man down on him and grinding their cocks together as he struggled to free himself from the confines of his pants. Asgore had a cape that fell over the two of them; Guin must not have noticed it previously, but with a simple tug of the clip hanging by his left arm, the cape fell away and Guin was free again to bite at Asgore's neck. Asgore moaned softly as his entire body draped over the leopard; his rigid erection grinding into the muscular abdomen like sliding between two mounds of flesh on either side. Their kiss grew a bit more passionate as Asgore came down and their muzzles locked once again. Drooling, panting heat washing over their faces as Asgore flexed his body hard against Guin's body. Asgore's hands sliding down Guin's rippling back down toward his waist and tugging him upward as he pulled the leopard's pants off completely. Guin was almost breathless as he felt Asgore's cock against his ass now, the beast raising his legs for a very obvious attempt at fucking him. Guin didn't struggle against it; this sudden sensation washing over him, he wanted it, he wanted Asgore badly and his passionate growls grew more in intensity as he moaned with each passing of the beast's dick against his backside. Asgore didn't waste much time, he pressed his flesh against Guin's ass and pushed inward; assaulting the leopard's ring with a size that clearly outmatched the space available.

Guin moaned and his hands clutched at the ground, dragging his fingers hard into the dirt under them. Asgore's arms wrapped around Guin's thighs, his fingers expertly spreading the warrior's ass cheeks apart as he plowed himself hard into the leopard, suddenly penetrating him and making him yowl in pain.

"S-sorry...I'm trying to be--" Asgore tried to apologize, but Guin silenced him.

"Ju-just do it... fuck me!" He howled as the pain began to subside, being replaced by indescribable pleasure.

*Thump, Thump, Thump* the earth under Guin's back was shaking with each brutal pounding he received, and still, he felt Asgore's hands exploring every inch of his body; his cock throbbing and slapping against his stomach inevitably being grasped by the beast and stroked in time with the penetrating slams he received. Guin was leaking heavily over his own stomach as his body was hoisted leg-up into the beast's body; he was soaking Asgore's hand as his balls flailed about between them, taking the brunt of each impact. Asgore moaned and rolled his head back, his mouth opening and gaping wildly as he assaulted the leopard. His growls deepening, his thrusts intensifying.

Had it been so long since Guin's last time that he was so readily heading toward the edge? Guin had no recollection of his past before waking with the leopard's mask on his head; he had no memory of ever being without it, and with Asgore's assertion that he was in fact a beast, he began to wonder if he'd ever been a normal human.

Such thoughts faded from Guin's mind as he felt the burn of his orgasm coming up on him like wildfire. His body arched outward and he could almost see the outline of Asgore's cock in his gut as he spasmed and let out a howling roar before several pumps of seed began to shoot down his body, covering his face, getting into his mouth in arching white ropes of cum. He watched as Asgore's body almost widened before his eyes, the beast's deep breathing making his chest seem even larger. Asgore slammed down hard into Guin's body, he could feel the beast churning him for all he had until his cock was pumping dry, but still he spasmed as though he were still orgasming. His face was dripping, his mask completely soaked in white, he wanted more; he wanted to take Asgore into his mouth and suck him dry.

Asgore was too far gone to really catch the signs, and as he rolled his neck back in his orgasmic throes, Guin took advantage. He pushed Asgore back with his legs; feeling briefly relieved at the feeling of Asgore's cock popping free of his ass. He then used his strength to knock the beast onto the ground once more and Guin dropped his weight on top of Asgore's body. Asgore stared at him in confusion before Guin quickly slipped his way down the beast's body and eagerly wrapped his lips around the throbbing; ready cock.

"G-Gods... I'm... so close!" He panted.

Teasingly, Guin released Asgore's cock from his lips, watching several eager spouts of cum shoot across the beast's stomach as he straddled Asgore's chest. Asgore took advantage of this position too and began to play with Guin's recently-loosened ass, his tongue running across it made Guin shudder in pleasure, his spent cock already beginning to spring to life with the touching of Asgore's tongue. Asgore's hands rested themselves on each of Guin's ass cheeks and he began to play rather heavily with the flesh. His tongue slobbered wetly between Guin's balls, up his taint and into his ass again and again as he slapped his hands heavily onto the leopard's backside. Guin was lost on teasing with Asgore's cock anymore, instead wrapping his mouth around the massive mound of flesh and feeling it pulse madly between his lips. Each time he released Asgore, a new spurt of white slapped across the leopard's face. Guin could feel the beast's balls churning, they were so ready for release now that he just had to continue teasing him. Meanwhile, Asgore's fingers and tongue spread apart Guin's ass, digging in harder and deeper, making ghost-cum shots pulse against his chest. Guin couldn't hold back any more and ravenously forced his mouth over Asgore's cock.

"RRRRRRRUUUUAHHHHH!" Asgore let out a wild roar that echoed through the caverns.

Shot after shot engorged Guin's throat passage as Asgore came; he swallowed as much as he could, but the sheer volume caused cum to shoot from Guin's lips uncontrollably as Asgore soaked himself as well as his partner. By the time Asgore's roaring came to an end, both were covered in a heavy coating of his mess; almost completely whitened from only a few moments prior...

Guin shook awake and sat up suddenly; dawn was coming up onto the horizon, and a dull light was beginning to fill the sky. He gasped and took a breath, swallowing the air tasted and felt like he'd truly been sucking on a massive beast's cock. As he took a few breaths; he realized that the night before couldn't have possibly been real. He looked down at his bedding, mentally realizing that it had to have been a dream. He breathed a sigh of relief that he was no longer trapped underground. He shrugged off the eerie feeling by rubbing the back of his neck.

"What... what an interesting dream..." He muttered to himself. "Guin... you've got quite the imagination..." He moved to stand up, and Guin then realized the sudden pain he felt in his ass. He winced and his hand moved to it instinctively. "Or... was it a dream?" he asked himself. It felt as though he had been fucked roughly by something massive, but...

Guin looked around, seeing nothing nearby as the light of the eastern sky began to cover the land. He could see the trail he had taken the night before; definite impressions of his footprints could be seen; but as the light began to come across it, the footsteps faded from his perception. "..." He couldn't think of anything to say as he retrieved his clothing and began to clean up his campsite. As he started toward his path onward, he looked again at the path, finding that all evidence he'd gone that way had been completely erased. Pondering for a moment, he reached it as part of the fork in the road. The path itself headed left; down the hillside, while the right path led up toward the familiar trail that would lead him back out of the wilderness...and suddenly, he was unsure of which way to go.

THE END