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A Knucklehead Workout

Sonic was bored out of his mind and had nothing to occupy his mind. "Uggghh, what a day. Tails is gone visiting Vanilla and Cream. Shadow is doing... whatever he does. There's no sign of Robotnik. And everyone else is busy or has plans for today," he sighed, unable to contain his disdain and tiredness.

Sleep overtook him easily and he drifted into a disgruntled slumber. He didn't know how much time passed before an irritating sound reached his ears. At first, he tried to cover his head with a pillow and when that proved fruitless he tried to ignore it, earning him the same result. Grumbling in annoyance, Sonic jumped out of the bed and began making his way to the source of the noise. He would've used his super speed, but he was just so bored and sleepy that he decided against it. "Tch, yeah, like I need to crash face-first into another wall and spend a week in the infirmary with Amy, ugh," he complained.

He didn't dislike the poor girl, he truly didn't. But she was way too damn pushy and clingy. He chuckled. "Plus she doesn't seem to get the memo," he muttered to himself just as he was about to exit his room. Catching himself reflected in a mirror, he paused. He was wearing only a pair of blue speedos with green trims on the sides, he could see his fairly noticeable bulge on his crotch and, best of all, his muscles.

Sonic smirked and turned in full to admire himself for a moment. "Heeeeey, looking good, Sonic. Looking real good!" Striking a frontal pose, the hedgehog flexed his muscles and smiled. "Dang, I'm amazing. I'm not as buff as Knuckles or Shadow, but damn it, I'm fucking amazing."

And who could blame him for thinking so highly of himself? He had saved the world on multiple occasions, he was the fastest thing alive, and could out-eat anyone in a chili dog eating contest. He had the medals and trophies to prove it. And his body was a temple of fitness through and through. His abs were toned, his pecs were solid, his glutes were firm and toned, his thighs, legs, and arms were rippling with muscles that, instead of being big bulging masses of raw strength, were smooth, slim, and perfectly toned machinery made for one thing only: moving really, really, stupidly, incredibly, ludicrously fast.

"Who needs overwhelming strength when you can run circles around them before they even think about throwing the first punch?" Sonic said to himself before the annoying sound became louder. "What in the world is that?"

Still refraining from using his speed, he moved downstairs following the noise that grew louder with every step he took. Soon enough, he discovered where the noise was coming from. "The gym?" He muttered before peering inside it cautiously. "I swear if it is Robotnik I'm going to... to... oh, wow..." was all he could say as his line of thought was interrupted by a most magnificent sight.

Sonic watched with raptured attention as the big, dumb wall of muscles that was working out scant meters in front of him was none other than Knuckles, the knucklehead idiot that half the time forgot what was left from right. He also discovered the source of the sound that had woken him up was nothing else but an impossible amount of weights he was currently lifting on one of the many machines of the gym.

"One-two. One-two. One-two," Knuckles repeated over and over as he pulled at the handles above him, lifting half a ton worth of weights behind him and producing a loud clang with each repetition. All of it whilst unaware of the blue hedgehog staring at him from the sidelines just outside the gym.

Meanwhile, Sonic could only stare at the studly wall of muscles that was his friend as he worked out. Just look at those bustling muscles, how the sweat shines against his skin, how he grunts and his big... muscular... thick ass, Sonic thought as he watched Knuckles continue his routine. Many compared him and Shadow to be polar opposites, but they were wrong. His more direct counterpart was Knuckles in almost every sense that mattered, especially when it came to the physical aspect.

If Sonic had to use a word to describe himself, it would be petite. Sure, his figure was athletic, but compared to Knuckles he was a twig. Knuckles was a head taller than him and three times as heavy and almost all of that weight were pure, unflinching muscles. His torso was wide, his pectoral more akin to solid slabs of metal that belonged to a tank rather than a living thing. His abdomen was flat but so sturdy and packed with powerful abs that could grind coal into diamonds. And his legs were totems of fine, toned musculature with thighs strong enough to crush Metal Sonic's head in between them.

He knew it was true. He'd seen it happen twice already. Man, what I would give to be in between his thighs, Sonic thought, blushing, as he admired Knuckles continued his routine for several more minutes until it came to an end.

"Good warm-up!" Knuckles cheered for himself. "Now, time for squatting!"

Getting up from the machine he had been using up to that point, Sonic's eyes grew wider and his cock hardened when he finally took notice that his gorgeous, muscle-bound friend was completely naked. He could see the fine lines of sweat running down his chiseled body, his heavy nut sack filled with rich, creamy spunk, his dangling cock that was larger than his.

But above all, the thing that captured his attention the most was the big red ass of his friend. His hips were strong, his lower back was firm as steel, and his buttocks, sweaty and flexing, were ample blocks of pure masculine strength. The little nub of a tail resting above his wonderful set of glutes tempted him with the fantasy of imagining what appearance the hole in the middle would look like... and how heavy his musk would be there.

Sonic felt how a ball of saliva traveled down his throat as he suddenly remembered he had to breathe again. Fortunately for him, he also smelled a sample of his friend's heavy musk: strong, powerful, and annoyingly enchanting, just like Knuckles. Silently, he continued to watch, eager to see what his friend would do next.

And Knuckles did not disappoint.

"And one! And two! And three!" Knuckles exclaimed as he began to squat with vivid enthusiasm. He reached incredibly low, fully exposing himself to his unknown audience.

From his vantage point, Sonic could see the muscles of his friend working at full efficiency. He could see the strain each squat carried, he could almost imagine the burning sensation spreading through his body, his glorious sacks of rippling muscles screaming while he worked out. Every inch of his body captivated him, but his glutes and his now very visible cock and balls captivated his attention the most along with the vision of his puckered asshole stretching to match his squatting motions.

"Holy fuck, he's so damn hot," Sonic muttered while his cock, already hardened, ached to be touched and played with. "Yeah... keep going like that, you sexy, overmuscled, knucklehead. Flex your muscles more, give me more of what I want!" He hissed while he grabbed his cock and began stroking it slowly.

"And nineteen! And twenty! That's a set," Knuckles said, rising to his feet. Posing in front of the mirror, the echidna flexed his muscles, adopting several positions in order to admire his results. "Daaaaaamn, I look golden! Or red, since I'm not using the Chaos Emeralds, but yeah, I look good! Big ain't got shit on me. He may be big and burly, there ain't nothing that can beat these guns!" Saying that, he flexed his arms in an anchor stance before kissing his biceps.

"Damn right you are, Knuckles," Sonic said a bit louder than before but not enough for Knuckles to hear him. He watched his red friend pose for almost a full minute more before he moved on to bench pressing. He watched in admiration while his friend performed a heavy, sweaty routine as if it was as easy as walking.

Then again, he always had a ridiculous amount of stamina, Sonic thought as the light smell of his musk made his mouth water and his dick harden more. Slowly stroking his rock solid cock, the blue hedgehog admired the moving, shifting muscles of Knuckles with each lift he performed. It wasn't just his arms and the upper part of his torso that was at work, though. With the amount of weight he was lifting, he had to make use of his entire powerful, sexy body to make it work. From his neck to his toes, everything worked in tandem to create the illusion that Knuckles was doing something ordinary.

"Fuck... if I'd try to lift half of what he's lifting I'd break a bone..." Sonic muttered moments before Knuckles set the bar up on the handles once more. Getting to his feet, the echidna performed another series of flexing and posing just to admire himself. "Do it, you sexy overmuscled fuck. Pose for me, you stud~," Sonic said, all but drooling at the sight before his eyes.

Knuckles nodded to himself before moving to another piece of equipment in the gym. Sitting on a bench, he began to pull on two handles, moving his whole upper body forth with each pull. "Burn! Burn! Muscles buuuurn~!"

Sonic stroked his cock faster, harder, his eyes closing as his mind began to imagine all sorts of scenarios involving him and knuckles sweating together. "Fuck. Stupid, sexy, red idiot...," he muttered while his balls quickly swelled, aching to cum in but a few moments.

The blue hedgehog forgot where he was for a moment and in a moment of lustful pursuit, unleashed a small torrent of cum that splattered against the wall. "Fuuuuuck, I needed that," taking a moment to catch his breath, he reopened his eyes partially whilst a smile adorned his lips. "B-Better clean that up before Knuckles notices me."

"Way past that point, Sonic," the cockiness in the voice calling out for him was as thick as butter.

With eyes widened in an instant, Sonic looked up only to find the looming form of Knuckles standing next to him. "AH! K-Knuckles! I-I uhhh, I can explain!" To his surprise, the echidna smirked.

"Uh-huh... explain how you just busted a nut while watching me? Does Amy know you crave meat rather than slipping it in?" Knuckles asked before crossing his arms.

"I, uhhh, n-not really?" Sonic replied, struggling to regain his composure.

Knuckles chuckled. "So, I take it you enjoyed what you saw?"

Sonic blinked, his eyes still glued to the muscular figure of his friend. "Y-You knew I was watching?"

"I put up a bit of a show, yeah. And, come on, Sonic, I'm stupid, not slow... no wait, it's the other way around," humming for a moment in deep thought, Knuckles shrugged when he failed to come up with a decision. "Eh, doesn't matter. I pretty much saw you from the start."

"Fuuuuck," Sonic cursed, now getting to his feet with the aid of Knuckles. Looking down at his wad of cum, he felt his cheeks blushing and he actually began to fidget. "You're not mad about that, right?"

Knuckles' smile widened. "Mad? Man, I'm so fucking happy!" Taking a step forth, he placed his hands on Sonic's hips, making him shudder. "You have no idea how long I've wanted to say something to you! I thought you and Shadow, you know, knock-knock~"

Blushing more to the point his cheeks now started to match the echidna's color at Knuckles' bold yet soft and caring hold of his hips, Sonic cleared his throat. "Excuse me, but one, Shadow is straight as fuck. Second, fucking ewww. And third, you have feelings for me, dude?"

"Mostly lust, but yeah, I have feelings for you, Sonic," Knuckles chuckled. Caressing the slim hips of his friend, he continued. "Fuck, Sonic. You have such girly hips. Your body is so damn girly, I love it~ Makes me want to fuck you right now, babe."

"...Fucking hell, you're serious?" Sonic exclaimed, smiling. "You'd give me a chance?"

Knuckles shrugged. "I'm not into romance, dude. But I think we can manage it, if you want."

Sonic smiled, still blushing as bright as a bulb. "I always thought you were straight... or bisexual at most, Knuckles."

"Nah, dude. Why do you think I have a body like this? I'm gay. But I don't like taking it up my ass, I only enjoy fucking cute femboys like you, babe," the echidna admitted, tightening his grip; his fingers reaching Sonic's ass. "How about you? Do you like pussy and cock or just dick?"

"Dick... just dick," Sonic gulped while his head and heart were just about ready to explode due to the overwhelming joy he was experiencing. It wasn't exactly like he always envisioned his confession to be, but it was far, far better than he ever expected things to be. "Uhmmm... d-does that mean that we...?"

Knuckles blinked a few times before responding. "O-Oh! A couple? Yeah, dude! I don't like doing mushy stuff, though... but if you want to kiss, I'm all for it."

"Maybe later," Sonic replied, smiling. "Right now... I have a confession to make..."

"Let me guess. You like how manly and strong I am, don't you?" Knuckles asked.

Sonic did a double-take. "H-huh? How did you know!?"

"I'm not blind, Sonic. I lost count of how many times you stared at my muscles during missions and stuff!" Knuckles gave out a long, boisterous laugh. "Gotta admit it, though, it feels good to have that kind of attention, babe~"

Putting his hands against the broad, sweaty, glistening torso of his now-boyfriend, Sonic traced his fingers slowly against his skin and muscles. "It's a bit more complicated than that, though... I... I have a thing for big hunks like you, Knuckles." He waited for a moment to gather his resolve, then he continued under the silent but understanding gaze of the man he loved. "I like muscles, okay?" He confessed in a hurry, nearly looking away in shame.

"Muscles?"

"Yes, muscles."

"Big muscles?"

"Especially big muscles."

"Any preference?" Knuckles asked, his hands now slowly kneading the hips and ass of his blue boyfriend. "That way I'll know what region to work out more, babe~"

Sonic felt his heart skip a beat and the urge to kiss the idiot in front of him grew by the second. Somehow, he resisted in favor of answering him. "T-The lower regions..."

"Like my thighs and shit?"

Sonic shook his head. "Above those... you know... where your tail is?"

Knuckles laughed. "Seriously!? You're an ass man?" Sonic nodded with some hesitation. "Well, fortunately for you, babe, I do have one greeeeat ass if I have so say so myself!" As if to further illustrate his point, he grabbed one of Sonic's hands and drove it towards his ass.

Sonic gasped as his hand made contact with the solid slab of muscle that was Knuckle's asscheek. His fingers ran across its surface, barely caressing as it urged him to grab and squeeze as much as he could; each powerful glute bigger than his hand and oh so satisfying. "A-And Amy wants me to fuck her when I can have this instead?" He muttered to himself, his dick hardening and hitting something much harder, girthier, and meatier. Looking down, the hedgehog saw that his cock was bumping against the ten-inches long semi-erect snake that his boyfriend had hanging from his groin. "F-Fuck me..."

"Later, babe, later~," Knuckles chuckled before squeezing the softer but still firm ass of his blue boyfriend. "Damn, Sonic, you're nothing bad either~ I'll love fucking this tight ass of yours later, my lady-like bitchy femboy~"

Sonic blushed while the desire to call Knuckles out died in his throat. "I hate being called a femboy... but when you say it," pressing his face against his hard pecs, he sighed. "It feels so fucking right, Knuckles."

"Heh. Hey, dude, want to work out some time with me?" Knuckles asked, idly pressing his boyfriend against his toned, muscular body. "No more excuses or sneaking about to watch me, right?"

"I... would love that, Knuckles. I may not be a die-hard for exercising as you are, but I have to keep my shape. We can sync our routines or something?" Sonic blushed while he stared up at the echidna smiling at him cockily. "Hey... this may sound weird... but, uhhh... do you think it'd be cool if you, you know, pose for me?"

Knuckles snorted. "Yeah, you would like that, bitch boy," smacking his ass once, he let his lithe boyfriend's body go and moved back into the gym. "Come on, babe. I'll show you some good poses... but why though?"

"I like muscles and I like you, Knuckles. J-Just pose for me and... s-sorry if I get weird, okay?" Sonic said, warning his boyfriend beforehand. "I don't know if I'll be able to contain myself..."

"Then don't, dude. I never contain myself with what I want! Besides, what can you do that's weirder than two naked guys spending some quality time in a gym?" Knuckles countered.

Sonic nodded, following the echidna. "Point taken," he admitted. Following him for a couple of steps, they came to a final halt at the middle of the gym and he sat on one of the benches while Knuckles stood in front of him less than a meter apart.

"You know," Knuckles started while stretching at the same time, just to make sure he'd be nimble enough to give his blue boyfriend a good show. "I'll be fine with whatever you want to do, dude. Fap again or touch me or do whatever you want! Just have fun, babe, because after you have your fill, I'll fill your ass... with my cock," he finished, chuckling.

"Then what are you waiting for, you giant red tease!" Sonic said in an enthusiastic tone. Feeling that shame was pointless and not wanting to be unfair to his boyfriend, he removed his speedos, tossing them aside, leaving them forgotten as he was now equally naked as Knuckles.

With his right hand taking a firm grip of his hard cock, he began to stroke it as he admired the rippling muscles of his boyfriend and the thin droplets of sweat coming from them. But more than that, the musk of Knuckles scrambled his mind into a frenzy that pushed him to desire touching him more than anything else.

Once Knuckles judged he was sufficiently prepared, he froze for a moment before suddenly flexing his muscles and bending his body to the side. "BAM!" He shouted as he stood in a Side Chest pose. "How do you like them apples!"

"Fucking hooooot," Sonic muttered before his hand began to move faster, pumping his cock while he all but drooled all over the perfect figure of Knuckles. Now that he was posing right in front of him, he could actually hear his muscles straining, expanding, and contracting with every little movement he made. His glutes were slightly exposed, but they were big enough for him to admire, his chest was wide and urged him to embrace it, his cock throbbed with abandon; clearly enjoying putting up a show as much as he was enjoying seeing it.

"Dang, I may grow addicted to this! Who'd know that posing for an audience felt so fucking good?" Knuckles chuckled before striking a Most Muscular pose, causing his chest to expand to a near-impossible size alongside his biceps and arms. Putting on a little show for his blue boyfriend, he flexed on his pecs, making them dance and bounce up and down. "How do you like that, babe?"

"F-Fuck me," Sonic gulped, his tongue lolling out of his mouth. "You're so fucking hot, Knuckles. Why did I never confess to you before!? I could've gotten myself a muscular stud that could put Adonis to shame a long time ago!"

"Adowho?" Knuckles asked, confused.

"L-Literally a mythological guy that started the whole bodybuilding culture, I think. Alongside Atlas," Sonic explained, humming and pumping his cock hard. "Point is, you're way better than them~"

"Damn straight, babe~," taking on another pose, he shifted to a Front Spread.

Admiring the diamond-solid abs of his boyfriend, Sonic felt the urge to touch them, to feel them under his fingertips. How hard were they actually? Were they as chiseled as they appeared to be? Would Knuckles truly be okay with him touching him all over his body? Such questions passed through his mind and, before he could think about it, his mouth opened and asked a question. "Could you show me your ass, Knuckles?"

Before Sonic could realize what had come out of his mouth, Knuckles complied with his request. Chuckling and posing a few times to show several of his individual muscles (all of which made Sonic's lust increase to new heights), he slowly, sloooowly turned around as he did so until, finally, he jumped only to land in a Rear Double Biceps pose.

The sight of his tremendously thick asscheeks threw under the bus any and all sense of shame and doubts that the hedgehog may have had until that very moment. His heart was on the verge of exploding with how fast it was beating and his right hand came to a sudden halt. With nothing but the thick, powerful, muscular glutes of his boyfriend and his encouraging words in his mind, he dropped to his knees and leaned forth.

"So? Are they everything you hoped foooor!?" Knuckles yelped in surprise when he felt something pressing against his ass. Looking down towards his rear, he found his boyfriend kissing and licking his strong asscheeks while his hands rested on his hips in search of stability. Feeling the soft, hot, wet tongue of Sonic caressing his derriere caused his cock to throb madly and spew a few droplets of pre-cum onto the ground. "Damn, you really like my ass that much, you horny bitch?"

"Y-yes, I do. It's so big and hard but also soooo fucking juicy and it stinks!" Whiffing at it while he kissed and licked every inch of it, Sonic savored the sweaty taste hitting his tongue, treasuring it more than his favorite drink. Each whiff and deep inhale he took sent his mind into a fuzzy haze that shredded any lingering doubt from his mind.

Even while his instincts and his lust shouted at him to shove his face in between the red giant's ass and worship him like the thick, musclebound god that he was, he fought against it with the desire to prove he was more than just a lustful imbecile seeking to satisfy his perversions with his friend and now significant other. Pulling back from his ass with great reluctance, but not without first placing a firm, long kiss on his dock, Sonic carved a wet path of kisses and licks all across the body of his boyfriend until he arrived at his chest.

With their cocks touching once more and showing the vast difference in size between them, Sonic traced his hands all over the echidna's steel-solid biceps, lightly squeezing them. "Damn... it's like I'm trying to squeeze one of Robotnik's robots, only that your muscles are way stronger, Knuckles," Sonic commented through a fierce blushing face. "And your pecs are so... biiiiig," he slurred before nuzzling his wide chest, easily twice as broad as the hedgehog's shoulders. "I can hear your heartbeat. And I can feel just how warm you are, dude. Damn it all, y-you're so perfect, Knuckles. Your body is perfect."

"You think so? I take a lot of care of it, you slut," Knuckles replied before striking another Side Chest pose. Looking at himself in the mirror with Sonic embracing him put a smile on his face and a barely noticeable blush on his cheeks. "What else do you like about my body, femboy?"

"I like your biceps and your forearms, your arms, your triceps, and neck... all of you I like, Knuckles," Sonic said through red-beating cheeks, his tongue and lips dragging against his muscles bit by bit, tendering it and worshipping his form and figure like he deserved to be treated. His hands touched, caressed, and pressed against every inch of exposed skin and muscle he could find, humbled by the fact that the red echidna could break him at any moment were it not for his speed, but even with that, he doubted he could dodge a punch coming from the red idiot since he would be too distracted admiring his body to do so.

"Ohhhhh?" Knuckles chuckled, his cheeks glowing brighter. "Tell me more, babe. What do you want to do? What do you want me to do?"

Sonic shivered as though a current of electricity traveled up his spine. "I want... I want to admire how handsome and powerful you are. I want to feel your body, press mine against yours, and worship your muscles," he gulped and his face took the same shade of red as that of his boyfriend. "And I want you to fuck me, Knuckles."

"Hmmhmm!" Knuckles hummed, his throat rasping as he changed to a Front Relaxed stance, all the better to allow Sonic all the room he needed to fulfill his fantasies. "I can agree with those ideas~ What are you waiting for, bitch boy, I'm wide open."

Sonic took the invitation and went with it. He began to sniff, lick, and kiss every inch of Knuckles' chest. He covered that massive, bulging mass of muscles in kisses and licks, tasting the saltiness of his skin and enjoying every moment of it while his strong, potent scent threatened to knock him out if he kept sniffing too close to him. Hence he started sniffing faster and harder, his speed only matched by his lips and tongue passing and praising wherever they could touch.

Meanwhile, Knuckles hummed and softly moaned due to Sonic's loving show of affection. He had never been so pampered before and he was loving every second of it, but more than just the carnal satisfaction it brought him, the reflection on the mirror did much more than that. I knew I was huge, but damn, Sonic is tiny compared to me, he thought, smiling, as he flexed the muscles his boyfriend was tending to at the moment, feeling and seeing him slowly make his way towards his abdomen.

He too admired himself, changing once more to a Side Chest pose that Sonic took advantage of and began licking and kissing his hard-earned abdominal muscles; a pack of squared musculature that could double as a washing board. But his attention was more heavily focused upon Sonic and his lithe form. He too showed a succulent and healthy body filled with tightly packed muscles and flexing tendons, but he was built for speed, giving him an almost lanky yet fit body. Comparing him to the likes of Amy or Sally was appropriate since the only real difference between the curvy bodies of his friends and that of Sonic were their hips.

And yet he's got a girly fucking ass. Man, I can't wait to pound that~, Knuckles thought, licking his lips at the mere idea of fucking the ass of his smaller beta boyfriend.

Sonic reached the red abs of Knuckles and quickly got to work. He kissed each and every individual tightly packed rectangle before licking it clean, almost as if he was washing it or cleansing it from the layer of sweat and rich flavor that covered them. "Mmmhhmmm~," his throaty moans came undisturbed and uncontested as he traveled downward yet again, moving inch by inch until he reached the large cock of his boyfriend.

He looked up to find Knuckles staring at him and his blush magnified, his heart pounding with delight and excitement before his tongue touched the underside of his cock. He then dragged it slowly all over the impossible length of his boyfriend's dick until he reached the tip; smooth, red, and pulsating like the rest of his shaft. Kissing the tip once, he moved lower again, reaching the large dangling balls for a deep whiff.

Sonic let out a guttural moan of satisfaction as he plunged his nose harder against the sweaty, musky nutsack of the echidna. His tongue came out on its own just so it could taste those large balloons tempting him with a creamy reward. Opening his mouth, he easily took one of the two orbs inside it and began to suck on it, treating it like he would a lollipop. All the while he was doing that, he also sniffed at the strong, musky, potent aroma of his boyfriend, the scent being strong enough to almost knock the daylights out of him.

"Ohhh boy, yeeeeeaah. You know how to treat my balls just the right way, bitch," Knuckles commented as SOnic moved to do the same thing with his other testicle. "I hope you're liking that, babe, cause I think I'll need that lovely tongue of your licking in between my cheeks pretty damn soon!" He said with a chuckle before adopting a Low Stance pose, all just to let Sonic have an easier way to fondle and suck on his balls.

Letting go of his new favorite toys with a wet pop, the hedgehog smiled as a cute, red blush colored his cheeks. "Then why wait?" Sonic replied before crawling his way behind Knuckles again; his nose, lips, and tongue never ceasing to worship the stud standing tall and strong over him.

He didn't know how long it took him to reach the echidna's asscheeks again, but he didn't care. All he cared about was getting as deep as he could in between those red, shiny cheeks of his. Using his hands, he spread them wide rather easily now that he had removed the sweat covering them. "Unnnnffff!" Sonic let out a strained moan as the first thing that hit him was the concentrated, potent musk of his boyfriend. Even the smell of his balls and junk paled in comparison to the mind-numbingly strong perfume he found in between those salty cheeks.

Driven by lust and a pang of hunger he didn't know he could possess, Sonic dove right into the action. The hedgehog that held the title of the fastest thing alive took the deepest and longest snort of his life. The air in his lungs was replaced by the fresh, incomprehensibly potent musk of his boyfriend.

The effect was instantaneous.

His mind reeled, his stomach churned, his heart skipped a beat, and his powers came to life all on their own, enhancing his perception and slowing time around him to the point that he almost blacked out from sheer joy and the effect the hormone-packed stud had on him. His cock throbbed madly, nearly triggering an orgasm without the need to touch himself so overpowering was his scent.

By the time this perception returned to normal and he somehow managed to avoid falling to the ground unconscious, his tongue was more than ready to continue the onslaught. Namely speaking, by starting to lick and prod against the pucker of the echidna. His lips quickly sealed around it and his tongue, either due to all the sweat nestled around Knuckles' starfish or his eagerness, easily pierced through the ring of flesh and entered the juicy asshole of his boyfriend.

Knuckles groaned in elation while his cock throbbed madly. "F-Fuck, babe, that feels way better than I ever thought it would! Come on, yah whore, show me how much you love my ass!" He cried out before using a hand to grab Sonic behind his head and push him more against his ass, forcing him to eat his ass out more. The echidna smiled and blushed slightly, trying to keep his cool and strong front, but the coiling tongue of Sonic having a day field inside his anus while his lips pretty much made out with his pucker proved to be almost too much for him to handle since he didn't have much experience.

But now I'll be getting a looooot of experience in, haha! Man, I should've asked Sonic out way back when~, he thought, smirking widely as he did so.

The rimming continued for several moments of deep, unscathed indulgence; both of them experiencing different forms of pleasure that came from the same source. Sonic spread Knuckles' cheeks wider and wider, his fingers squeezing as much as he could the hard glutes of his boyfriend while at the same time doing his best to bring him as much pleasure as he could and show him he was a good little bitch for him to play with. Knuckles continued to moan and press Sonic's face harder against his asshole while at the same time pressing his asscheeks together, trapping the hedgehog's face in between with no possible escape.

Their cocks throbbed all the way through those seemingly endless minutes until, in a rather abrupt manner, Knuckles pulled away from him. Turning around and without missing his grip over Sonic's head, he cockslapped him a few times, shutting any protest the blue slutty femboy could utter before he could do so. "Time to take it to the next level, babe~ And by next level I mean up your ass!"

Before Sonic could protest, Knuckles picked him up and pushed him against the nearest wall. The impact was strong enough to make a few things stumble to the ground. The two locked gazes... and then kissed for the first time since hooking up less than an hour ago. Their tongues danced while Knuckles guided his shaft towards Sonic's asshole, while the hedgehog spread his legs and wrapped them around his boyfriend's waist while his hands came to rest on the echidna's shoulders.

Their lips separated and moans came out. "Fuck me," begged the blue hedgehog.

Knuckles obliged. With a firm grip over his boyfriend's hips, the echidna thrust up against the surprisingly elastic and pliable asshole of his boyfriend. Within moments and in a single thrust, he was hilted up to his base. "FUCK!" He screamed. "B-Babe, I'm going to destroy your ass! You're so damn sexy, my little slut! H-How is your ass so loose and tight at the same time!?"

Groaning, Sonic replied. "Lots of practice with a very large dildo~," and then he kissed his nose, tempting him to continue.

Knuckles huffed and puffed as he grew accustomed to the new feeling of tightness gripping his cock. Once he adjusted to it a minute later, he began to move his hips. At first, it was clumsy, slow, and had little strength behind them. But soon he began to increase his speed, each repetition turning out easier than the previous one. Both heroes began to moan and groan in pleasure, with Sonic being by far the loudest with his constant crying out and drooling smile; his eyes fixated on the broad, muscular chest of his beloved Knuckles.

"H-Harder! Fuck me harder, Knuckles! Make me your slut! Destroy my ass, you wonderful numbskull!" Sonic cried out, demanding to be fucked harder.

"Fuck it, then!" Shouted Knuckles in response. The speed and strength behind his plowing motions increased almost immediately, doubling with every couple of thrusts with long, hard impacts. He could see Sonic's cock wobbling up and down in tandem with his powerful, merciless thrusts, already imagining spewing cum at any moment.

Sonic gripped his legs around Knuckles' back harder, tighter, creating a linchpin so that his boyfriend wouldn't escape from his duty. His inner muscles relaxed and contracted on their own with the sole purpose of extracting as much cum as he could from within the hefty balls of the muscular stud currently claiming his ass for his own.

The power behind each thrust put to the test not only the endurance of the two lovers, but also the structural integrity of the gym itself. It was fortunate that Sonic had the body to support the brutal, raw, pure masculine strength of Knuckles, for the echidna made the whole gym tremble and shake with each wall-cracking pounding motion of his hips.

Weights, bars, and boxing gloves fell to the ground while the running mill flipped over as the fucking turned into a localized earthquake driven by the inherent strength of the number one knuckleheaded idiot of the group.

"AAAAHHH! AAAHHH! AAAHHH! F-Fuck me more, you gorgeous musclebound stud!" Sonic cried out, his eyes tearing up as he rapidly approached his climax.

Knuckles' breathing was labored and ragged, each slam of flesh meeting flesh producing a loud smack while his balls churned every last possible bit of cum that he was going to deposit inside his boyfriend's rectum. "T-That's it, babe! Grip me tighter, because once I'm through with you, no other cock will fit your sexy femboy ass, you little slut!"

The wall supporting their forceful fucking began to show cracks expanding from their meeting point as the thrusting became rapid and more frantic. A window shattered, more equipment toppled over, and the cry of columns cracking filled the air alongside the potent, mind-breaking musk of the echidna and the music that was their combined, continuous moaning.

Finally, with the last thrusts delivered, the two of them came. Knuckles was the first to achieve his entrance to cloud nine, filling the hot, clenching ass-pussy of his boyfriend with a torrent of cum. Sonic came almost a second later, his sticky, potent seed spewing wildly from the tip of his equally wildly bobbing cock all over their stomachs and chests, staining them in white.

They remained like that for a minute or so, waiting for their post-orgasmic bliss to fizzle out. They were sweating more than any other workout session ever could achieve, they were tired but not exhausted, and they were content. Sharing a final kiss through tinted cheeks, Knuckles withdrew his cock from the confines of his boyfriend's ass-pussy letting a flow of hyper fertile seed flow out and splatter against the floor. Gently, he helped Sonic on his feet, but the raw fucking and the post-orgasmic pleasure were still playing an effect on him and he nearly fell on his knees. Easily catching him, the echidna smacked Sonic's ass a few times before letting him go.

Falling to his knees more gently (and now brandishing two red asscheeks), Sonic remained there in a pool of his own cum. "F-Fuck... t-that was fucking amazing... K-Knuckles... wow, I can't believe we actually did that..."

"You better believe it, hun," Knuckles replied, chuckling. "Come on, get on your feet. We're not done yet. I'm going to fucking ruin your bed next, babe~," he said before turning around and started to walk away.

Sonic stared at the back of his over-muscled boyfriend and smiled. His eyes darted all over his glistening, sweating back. He blushed at the sight of his buttocks swaying from side to side at an even, steady pace. His movements were filled with confidence, exaggerated, and made to allure him more than anything.

And it worked.

He tried to stand up, but he didn't have the strength to balance himself on two legs. So, opting for the second option, he began to crawl out of the gym in pursuit of his boyfriend and his sweaty glutes, ever carried forth by the sweet, potent smell of his overpowering glutes.

Knuckles smiled without looking back. "Hurry uuuup~" he cried out and the hedgehog followed quicker.

This day has been the fucking best! Sonic thought with an ear-to-ear smile and blushing cheeks, knowing his day wasn't over yet.

The End.