Gnasher was a simple creature. He had lived in the wastelands of the Underpass his entire life, scrounging through refuse and stealing from travelers and other scavengers to survive. His stomach growled with hunger and he patted his clawed hands on the tough red skin of his abdomen. He would have to find food, and soon. The wastes were vast flat plains of dust and dirt, the only permanent feature the ancient, giant crumbling highways that stretched across the huge expanse and gave the Underpass its name.
After wandering through the wastes for a few hours, he spotted a particularly promising mound of trash in the distance, the small hill of garbage likely to contain something potentially edible. Gnasher started to approach but paused when he spotted a red figure at the base of the pile, rummaging through its filthy spoils.
The creature was another of Gnasher's kind, a roughly five foot tall humanoid with red skin, clawed hands and toned muscle. Gnasher snarled quietly and began to advance, keeping his eyes locked on the rival that dared to rummage through HIS spoil heap. Luckily for him, the other beast was too focused on picking through the waste pile to spot him, and was completely surprised when Gnasher's backhand came flying into the side of his head.
The rival shrieked with pain and tried to roll away, but he leapt atop him, biting and clawing and screeching with a terrible fury. They struggled for a moment, their claws occasionally drawing blood and making small cuts, the dark crimson of their blood contrasting with the dull brick red of their hides. Finally after a particularly savage bite on his ear, Gnasher's rival whimpered and went still, admitting defeat and submitting to the stronger male.
Gnasher stood and loomed over his defeated opponent, smugly basking in his victory and enjoying the fearful whining of the rival at his feet. It was not uncommon for their kind to kill each other after fights like this, but as Gnasher eyed the other male laying in the dirt he started to think of much better things to do with the defeated enemy. It was also not uncommon for one male to service the other in exchange for a stay of execution.
Gnasher sneered at the other male, his predatory gaze making the loser tremble with fear. His opponent rolled over onto his belly and tried to crawl away, but he pounced on him once more, pinning the other male to the ground. Their kind wore no clothing, their tough skin more than enough to survive the warm dusty climate of the Underpass. Panting with arousal, Gnasher began to rub his erection against his trapped opponent's notably large ass, the angry red member growing in length until it was nearly a foot long.
Copious amounts of pre-cum leaked from his huge cock, the slippery fluid lubricating his captive's backdoor. His opponent struggled and squirmed, but Gnasher poked and prodded until he finally forced the head of his rod into his prisoner's rear passage. He growled triumphantly, pleasure flooding his brain as he pushed more and more of his cock into the other male, the tight tunnel squeezing and gripping his intruding tool.
His rival wailed and protested, trying and failing to break free as Gnasher started to fuck him properly, his fierce thrusts pounding the captive scavenger into the dirt. His enormous scrotum swung as he fucked his new toy, his apple-sized balls slapping lewdly into his rival's asscheeks and resting momentarily on the other male's large sack before being pulled back again.
The shouting and thrashing of the creature beneath him started to change, the once fierce protestations shifting to reluctant moans and poorly hidden gasps of pleasure. Gnasher snorted and laughed, the grovelling male beneath him was starting to enjoy being dominated and having his ass plowed!
"Someone's enjoying himself!" Gnasher sneered and groped his rival's ass, grabbing great handfuls of his plump rear and pushing his long shaft deeper and deeper inside him. "No wonder you like being fucked like a female, you've got the fat ass of one! Maybe if Gnasher pumps you full of cum you'll get pregnant?"
"N-no," the rival stammered, "Moon is a male! Moon can't get pregnant! Oh fuck, Gnasher's dick is making Moon feel so good!"
"Moon! Ha!" Gnashed laughed and jeered as he continued to work his cock in and out of his conquered opponent's asshole. "Moon is a girl's name! I bet you've always wanted this! Well, Gnasher will give it to you!" Gnasher pulled on Moon's hips and raised his ass in the air while keeping his face firmly planted in the dirt, posed in a thoroughly compromising position.
Wrapping his arms around Moon's waist to keep him secure, Gnasher went into overdrive, slamming his crotch into Moon's full round rump and driving his long rod deeper and deeper with every swing of his hips. Moon lost all pretense of resistance, the now submissive creature openly moaning and mewling with lust as Gnasher completely dominated him. Gnasher was intoxicated, the sensation of Moon's plump rear squeezing his cock and the lewd clapping sounds of his crotch slamming into Moon's asscheeks was too much to bear.
"Here it comes, ass-slut! Take Gnasher's cum and get pregnant!" With a few last forceful thrusts, Gnasher shoved his cock as deep as it would go inside Moon, the two of them moaning and howling as their orgasms hit simultaneously. Moon's climax spewed pointlessly on the earth beneath him, but he could feel Gnasher's ballsack against his own, tensing as it prepared to empty its load.
Gnasher's tongue lolled out of his mouth, his climax bringing him to a sexual nirvana. His dick throbbed and pulsed and the massive amount of cum that his kind produced began to surge into Moon's fat rear, the bottom bitch held tight as Gnasher pumped jet after jet of sticky hot goo deep inside him. They stayed locked together for a few moments, Moon continuing to spill his seed on the ground while Gnasher's balls continued to throb and pulse as he unloaded every last drop of cum in his slutty captive's butt.
When he was finally spent, Gnasher collapsed on top of Moon, sighing contentedly as he used the weaker male for a body pillow. Moon whimpered lightly, but did not complain, the now well-stuffed bottom too satisfied to bicker or fight. He felt so full and warm, so complete and fulfilled. Maybe he would try to find Gnasher again? Moon yawned and closed his eyes, the happy beast practically purring as he fell asleep on the ground with Gnasher's cock and cum in his ass.
Gnasher enjoyed the afterglow of his orgasm for a time, the victory over a rival male making the rough mating all the sweeter. Snoring soon interrupted his revelry and he snickered mockingly when he realised it was Moon snoozing beneath him, his supple rear still filled with his seed and corked off by his cock. The slut had fallen asleep, with a goofy smile on his face! Gnasher snorted again, the male beneath him should have been a female, he was so well suited for breeding!
Their kind had no females however, reproduction only possible when they managed to ambush and impregnate the human females that sometimes traveled through the wastelands of the Underpass. Gnasher eyed Moon's large buttocks appreciatively, groping and grabbing as he admired the other male's rather feminine qualities. It was a shame his kind had no females, Moon would certainly have been born as one and the massive amount of seed Gnasher had pumped into him would definitely have impregnated him.
He started to wonder what to do with Moon. He could kill him here and now, sure, but he was confident he could easily defeat him again and an ass like his could be hard to find in the wastes. Gnasher propped his elbows on Moon's back and rested his chin on his hands while he pondered. Moon was certainly proving to be useful! A soft and warm mattress to rest on while he thought, a fat ass to ogle and fuck, a weaker male to assert dominance over...
Gnasher sighed. He decided he would let Moon live. He would enjoy the feeling of his curvy booty wrapped around his dick for a bit longer, then he'd pull out and leave the slut with a butt full of cum while he took whatever was in the garbage pile that they had fought at the base of.
Laying on Moon with his dick up his butt was nice, but Gnasher eventually grew restless and stood, his penis sliding out of Moon's well-used hole and some of his seed dripping and splattering over Moon's rump. "You look good covered in my cum." Gnasher told the slumbering Moon, admiring his handiwork. He shook his cock, the last bits of slimy seed flying onto Moon's prone form. Smirking once more, Gnasher set off to rummage through the waste pile that sat nearby.
After a few hours of combing through the mound of trash Gnasher sat at the base of the artificial hill, examining his finds. A dense nutrient loaf that wasn't quite moldy yet, some shiny coins, an old metal knife and a weathered knapsack. He nibbled on the nutrient loaf while he put the rest of his loot in the pack, preparing to head back to his current den for the day.
"Wait!" Moon's voice slightly started Gnasher and he whirled around, expecting another fight. Moon had waken up and was standing behind him, shrinking back when Gnasher bared his teeth and claws. "No fight, no fight!" Moon knelt down, holding his hands out in surrender. "Moon wants to talk!"
Gnasher eyed the weaker male suspiciously. Was this a trick? Some kind of trap or ruse?
"Talk? Why? Is Moon trying to trick Gnasher? Should Gnasher have killed him earlier instead of letting him live?" He probed the other beast.
"No, no! No kill Moon!" The creature grovelled. "Moon had a question! An idea that Gnasher might like!" Gnasher frowned and scratched his head. This was highly unusual for his kind, all this talking and negotiating or whatever it was that Moon was trying to pull.
"Fine." Gnasher huffed. "What is Moon's idea?"
"Well, Moon is weak and struggles but Gnasher is strong and dominant. Maybe Gnasher will let Moon follow him and keep Moon safe? In return, Moon will do whatever Gnasher says! Even keep Gnasher from getting lonely."
"Hah!" Gnasher snorted. "Moon really is a slut! Moon just wants to be fucked constantly! Fine then. Moon can come with Gnasher, but Moon is Gnasher's slave from now on."
"Oh, Gnasher is smart and kind!" Moon warbled. "Moon will do whatever-" Gnasher cut him short by unceremoniously dropping the backpack he had found on him.
"Here. Carry Gnasher's shit. Now follow Gnasher to his den before he gets mad and starts kicking." Moon hastily donned the pack and set off following Gnasher, the two dusty red figures wandering off through the wasteland of the Underpass.
