“Why didn’t you ever tell me about this earlier?!” Knuckles barked at Sonic. 

The reason was that Sonic still didn’t know why now of all times that he was suddenly able to transform in his werehog self at night. It was sudden and unexplained. He asked Tails and there was nothing wrong with the planet or the chaos emeralds. This shift into his much taller, bulkier, and wilder looking self was something he tried to hide, recalling how it made others react and he just felt awkward in it. But it was just his luck that he would run into Knuckles while trying to keep himself isolated in the woods... 

“Hmm...” the echidna pondered allowed after Sonic told him what he knew. “You know, now that I take a closer look...” He leaned in, really looking the werehog up and down. “You’ve got a pretty strong looking body.” 

“Uh, thanks,” Sonic stammered and then he let out a sound of surprise when Knuckles got in even closer, roaming his hands over his dark and thick fur, pressing and feeling up the bulk that was underneath. “If I had a form like this I wouldn’t be running out into the woods to hide it.” Knuckles further admired his friend’s much thicker arms, his wider chest...all while being so close to the changed hedgehog. 

“Looks like you’re big all over,” Knuckles said and Sonic groaned aloud. 

“Alright already!” the werehog said, pushing the echidna away but it was playful, making them both grin a bit. “What are you doing out here anyways?” 

“Oh, I was actually out here too...” Knuckled then coughed and blushed a bit. “You remembered we talked about how we blow off steam.” 

Sonic did recall them having some mature guys talk when Tails was away working on his projects. They started with random topics, eventually making their way to girls, their tastes, what they found attractive and then somehow the two got into the topic of masturbation. And namely how hard it was to do so with so many around so many calls for help that always needed to be answered. On top of just having the time to ‘blow off steam,’ there was also the matter of having a truly private place to do it... And further from there... 

“And you remember that other thing we talked about,” Knuckles said. Bold as ever he just reached out and cupped Sonic’s crotch. The werehog grunted and jumped a bit. Like his shoes, the shorts he wore while in his normal form had changed to a bigger pair with some rips for flair but they covered what he had between his legs. Same for Knuckles and his tribal loincloth that suited his ties to his roots. Even with them being hidden, Knuckles could feel how much bigger the hedgehog’s groin was now compared to the last time he saw and touched it. 

“You know you’ve become kind of a horndog since we had that talk,” Sonic said as he pushed Knuckles back a bit again. He felt like he was being ogled, even more so when Amy was fawning over him. But he blushed even more, feeling his groin betraying him, his shorts starting to tent. During the whole Dark Gaia situation he didn’t have time to focus on things like that. While he noticed that he was bigger down there, the world was at stake and he never fully explored what this form had to offer below the belt. 

“Looks like you’re just as curious about it as I am,” Knuckles pointed out. “I’m just trying to help you out after all. You said there’s still a lot about this look that you don’t understand. Well, let's cross a few things off the list.” As he spoke, Knuckles took it upon himself to get close, even down on his knees before Sonic, getting a hold on the werehog’s shorts and pulling them down. 

A free-spirit through and through, Sonic wasn’t wearing underwear beneath the shorts and Knuckles was almost hit with the cock that came swinging upwards. What Sonic previously packed, being larger than average by a good amount, was completely outdone by the long and thick thing that now hung between the werehog’s legs. Knuckles even stopped for a moment, looking upon the nearly foot long maleness that throbbed with the same added strength that coursed through Sonic’s body. 

“H-hey, wait a minute!” Sonic said, putting a large hand on the echidna’s head. 

“Doesn’t look like you wanna wait a minute,” Knuckles pointed out, seeing how hard the erection was throbbing. “Just let me help you out in seeing what this thing can do.” He stuck out his tongue and gave the wide tip a few licks before opening his mouth wide and taking it past his lips already. Groaning aloud, Sonic looked down at the beefy echidna that was down on his knees, slowly and boldly taking more of his large cock with now apparent issues. Knuckles was even humming as he felt the rock hard and hot flesh sliding further past his lips and over his tongue.

Sonic continued to watch as his friend was taking more of his cock, surrounding more of it in the warmth and wetness of his mouth. His mind was still processing that this was still happening while his senses were focused on the waves of pleasure. Knuckles was just going for it with more gusto than Sonic was expecting. With his hums against the flesh filling his muzzle, Knuckles was also lapping his tongue against it, getting a feel for the circumference and how it throbbed against his taste buds. Pulling his head back and pushing forwards, he started to bob on the portion that he had taken so far This furthered in taking more each time. Perhaps Knuckles was seeing this as another challenge to overcome? 

Moving forwards then back, getting over the midway point, the back of the tongue was reached by the echidna was still going. He paused for only a moment but made that next push that had the tip into his throat. Surrounding it in even more warmth and slickness, Knuckles did make a sound that was almost like a gag but he righted himself and kept pushing, not being willing to back down. Rolling his head forwards with his tongue still moving, Knuckles would stop at a point then pull back, taking the time to bob his muzzle along, getting a feel for what he had taken so far. Sliding over his tongue in both directions and even into his throat easier now. 

“Man, you’re really going for it...” Sonic said. Through the shroud of growing pleasure he couldn’t help but just be impressed by how Knuckles was hurtling himself right into sucking him off and taking as much as he could, nearly getting to the base. Though his hand was on Knuckle’s head he wasn’t helping at all, just watching as the smaller mobian was taking all of it on his own. As he felt the throbs against the walls of Knuckles’ throat, his cock was letting out spurts of precum that were tasted then swallowed, the act giving them both something. Sonic received the pleasure of the throat tightening while Knuckles enjoyed the much richer taste and the heat traveling down his gullet. 

That heat remained, blossoming outwards from his stomach, making its way through the rest of him. It wasn’t that strong at first but Knuckles did start to notice as he swallowed more precum. But the immediate focus was still on pushing, stuffing even more into his maw, feeling it probing further into his throat. Being so close to the end he made another firm push that finally had his muzzle against the werehog’s crotch and the whole of his shaft pulsating against the stretched walls of his windpipe. He only stopped for a moment; pulling back and pushing all the way back to the cock’s base again. 

“Holy shit, Knux....” Sonic panted, being impressed with what the echidna had accomplished. And then the pleasure continued as Knuckles’ further bobs had him feeling the silky walls rubbing themselves against his flesh, squeezing down to provide an even tighter hold. He hadn’t been sure if Knuckles had been able to take the whole thing or not, but now that it was all in... Knuckles was suddenly putting a lot more effort into it. Still licking and sucking while bobbing his head, Knuckles earned himself more precum that he swallowed, finding the taste even better than before while the warmth from within was also more noticeable. 

Tingles were traveling through him and there was this growing want to pleasure the werehog. Every time Sonic groaned and gasped, Knuckles felt all the more charged with that sense of need. Of obligation to please Sonic. He started to redouble his efforts without warning; pumping his head back and forth while licking and sucking all the harder, stuffing his throat full of the werehog’s cock, making Sonic moan out even more with a deeper tone in his voice. 

“O-okay, try and keep that up...” Sonic groaned, feeling the throbs of his cock becoming much stronger. More precum was coming out thick and with force, filling Knuckle’s throat before it was swallowed. And just as Knuckles was filled with this unexplained sense of growing need, Sonic growling more and desired more pleasure from his friend. There was this sense of wanting more from the echidna and this urge just came over him. With his hand already on Knuckle’s head, he increased his grip and surged forward with his strong hips. 

He didn’t stop after that first push. In addition to Knuckles’ continued bobs, Sonic started to rock his hips on his own, using his strength to stuff his cock down into the other mobian’s windpipe, plunging further into the tight passage that was also made so hot and wonderfully slick from all the precum that glazed the surrounding walls. For the first time Knuckles started to gag but even then he was still handling what the changed hedgehog was giving him. 

As the growls from him were growing all the deeper, there was something that clicked within Sonic. He looked down at Knuckles and recognized that the echidna was at his mercy. That Knuckles wanted to please him. He could see it in his friend’s eyes, that growing need to stimulate him. There was a hunger for more that kept the red furred male licking and sucking even harder in time with the huge cock pumping past his lips, not backing down against the onslaught that got stronger.

Getting into a pace that worked in time with Knuckle’s sucking, the two got into sync but Sonic was still clearly leading and his demeanor was becoming all the more dominating. He moved his hand and Knuckles’ head in time with his thrusts, seeking even more pleasure from the throat’s confines, making the passage bulge repeatedly. It remained tight as Knuckles was making sure to swallow the precum coming out from the tip.

By now it felt like something that Knuckles had to do. That warmth felt all over his stomach had become something else. A sense of need and compulsion for more and receiving it was fueling not just his overall lust but his focus on Sonic in particular. He wanted to go the extra mile in pleasing the werehog. Just the thought of eventually getting the werehog’s load was enough to make his heart race. There was no ounce of doubt or shame. The echidna’s focus was concrete and he made the moves to get it, even as Sonic was repeatedly humping into his mouth, keeping it in place with his clawed hand, letting out more of those deep and animalistic noises. 

Biting his lip, the grunting werehog could feel that he couldn’t be lasting through this kind of pleasure for too much longer. Every slip of his cock against the smooth walls and squeeze was added to it, getting him all the closer to that point. And yet he didn’t want to stop either, he still wanted even more pleasure. He did ease up or slow down either. Beyond just the pleasure itself there was also this instinctual need that flared up every time he looked down at Knuckles taking his cock so passionately. The urge to keep dominating Knuckles, to keep up his show of strength all the way through. And he did so by slamming his way in even harder a few more times while he could. The final push ended with him finally keeping his cock sheathed within Knuckles’ throat and his head kept in place with his large, strong hand. 

On top of the cock stuffing his esophagus, Knuckles felt it throbbing and shooting large gushes of cum. The fluid came out with more force, being hotter and thicker than the precum had been. For a moment Knuckles was stunned by the volume of seed that was flowing out but then he started to swallow. Right away he was struck with a much larger surge of that same feeling when he had been consuming the precum but heavily ramped up. There was no doubting it, as he felt the added heat getting to his stomach and soaring throughout his body. The echidna was suddenly struck with something akin to a sense of thirst that propelled him into drinking even more of the cum with an almost desperation. 

And yet, as Sonic continued cumming so hard and so much the amount of fluid became too much for Knuckles to keep up with. It spilled out from his mouth and started to make a mess of his face, his neck, and chest, trailing down to his stomach as well. He felt himself becoming marked in the werehog’s thick and hot loads, feeling its stickiness seeping into his pelt but his focus was still on consuming as much cum as he could while Sonic’s bigger balls were drawing up and surging their contents along, making a few more small humps to milk out the last of his climax, feeling it being swallowed as well. He pulled his length out, leaving Knuckles to swallow and then take a big breath of air, feeling how messy he was and yet his focus was instantly drawn back to the large cock that was throbbing hard all over again. 

At that point Sonic wasn’t even talking anymore. All that came from him were more of those growls as the need to do more overtook him. And at the same time Knuckles was feeling an equal amount of need to present and offer himself to the werehog, doing so by getting on his hands and knees, feeling consumed with a blazing sense of need like heat that even had his hole winking. 

That display drew Sonic in and he approached the offering echidna, even doing so by crawling on his claws hands and feet. And when he was close enough, he reached out and took hold of the other male’s backside, gripping and caressing his hips. Bringing more of his body in, Sonic’s cock landed right in between the red furred mobian’s cheeks. As it throbbed he proceeded to grind the cum-slickened erection against Knuckles’ ass and even over his winking hole. 

Knuckles moaned out from this. Just the simple rubbing of the shaft’s underside over his rim was enough to make him shake, as if his body had become a lot more sensitive and receptive to the werehog. He felt the cum but also even more precum getting onto his rump, which he didn’t mind at all, knowing how large the flesh was. That foot long cock was throbbing hard against him and both felt a surging anticipation. 

Almost like an animal, Sonic continued to growl and hump against Knuckles. Both were making their own noises from this. Knuckles in particular, his sounds were more pitched and submissive in tone. There was more being put into the back and forth motions, the strokes becoming longer and a bit stronger until Sonic pulled back again all the way and he suddenly plunged his cock into the echidna’s ass. 

Once he started, he continued to push his way in, hearing the smaller male’s gasps and desperate whines. As it entered Knuckles did cringe some but greater than that was the pleasure taking hold of him as his hole was getting stretched around the entering shaft. The weight of Sonic settling on top of him and the firm grip on his body both made sure that Knuckles was firmly in place. 

Knuckles’ gasps were much louder but even then they were still drowned out by Sonic’s low toned dominant growls. With the grip he had, his claws were pressing to the skin through the fur, giving an added edge that kept Knuckles trembling. But the echidna’s main focus was on how much he was getting filled. Sonic felt even bigger when entering him from this end but he was a tough guy and could endure. Mixing with that was the raw sense of need that called for even more.

Sonic didn’t even wait for the whole length to be inserted before he started pulling back and then pushing in, using his greater strength to force his way further past the tightness. Knuckles’ depths were parted while they were firmly clenching, bringing a pinch but the pleasure was much greater as Sonic was burying himself all the further in with every thrust that came after, really getting into Knuckles’ depths to the point that there was a forming bulge in his midsection. 

Knuckles had yet to say anything either, being too overwhelmed by the fullness that opened up his insides, still powering through every bit of resistance that his body was putting up on reflex. Sonic was so easily burying his way in, getting into Knuckles’ deeper parts while further stretching him and putting pressure on his walls, smearing them with precum that was acting as an effective lube, further easing the strain that Knuckles was feeling, giving him more of that addictive warmth and sense of need for more. 

Now thrusting  the full length of his cock in, Sonic made a point to push his tip in deep, making Knuckles’ stomach bulging outwards in time with the thrusts. Paired with them were the loud and wet smacks going in and out that were getting louder with each pump, rocking Knuckles’ body firmly while he was grinding on top and huffing right into the other mobian’s ear. It was hard for Knuckles to think about anything else as the pleasure was priority over his senses. There was also the thrill of Sonic’s claws against his skin, so sharp that it would be easy for them to dig in through skin. But he wasn’t afraid at all. What he felt for the beastly hedgehog was a pure sense of want and need for more and more. He wanted to please the werehog, to be his pet and means of pleasure whenever he needed it. The idea was solid in the usually tough echidna’s head. 

His and Sonic’s voices were echoing through the woods as they put their focus entirely on each other. The moans that gained a higher pitch and the firm feral snarls that kept Knuckles’ ears twitching beneath his dreads. There was also the firm smack of the werehog’s plump balls against his ass, the sound of penetration that grew sloppier from the precum flowing out past the spread rim, dripping down the back of the smaller red pair and onto the floor. 

As the force of the thrusts were ramping up, Knuckles was getting knocked further but Sonic’s grip kept him from getting launched. Even he was impressed with the other male’s raw strength. Even the light scratches of the claws and the hits of Sonic’s balls against his own added to his exhilaration. And he was loving it; being used by the werehog, acting as a means of the bigger male getting pleasure. Sonic was using him and humping into him without mercy, keeping the pleasure going without pause or let up, the sensations being endless when it came to reaching into his guts. 

“H-holy, aaahh!!” Just as Knuckles felt he was finally used to everything, Sonic was surprising him yet again by wrapping his large and strong arms around his chest, hugging him closely to himself as he reeled his body back and up. Going from having his body on top of the other male’s, to now leaning against a tree while holding Knuckles and still thrusting into him, Sonic didn’t miss a beat with his pace either.

In fact he snarled with an extra fierceness before, ramming his way in with extra strength that had been held back, causing Knuckles’ tailhole to spread even further and the whole of Sonic’s throbbing monster was inside, forcing out a sharper gasp from the smaller male. His moans were just short of shouts as the thrusts continued to something extra beyond him being cradled. It was the clamping down on Sonic’s mouth on his shoulder and his sharp teeth on his shoulder. 

Throughout Sonic’s cock was still slamming its way in, grinding against his walls and prostate relentlessly, making both feel like they were being worn thin. So slathered in addictive warmth, he could feel every throb so acutely. That was the thing that really set Knuckles off; his body shook and another choked noise came out of him. With widened eyes and his chest heaving, the bulky echidna’s own cock was throbbing and shooting thick ropes all on its own accord, shooting them out onto the grass below. With the strength of his climax came the even firmer clenches of his anus that Sonic was immediately compelled to hump even harder against until he couldn’t handle anymore either. 

Against Knuckles’ shoulder, Sonic drove every inch in again, having his balls pressed as firmly to the echidna’s ass as he could manage, all while those same heavy orbs were drawing up and surging their contents through his cock until they reached his tip and came erupting out. Growling and even drooling while his mouth was still clamped down, Sonic felt an even greater rush than before as he  came hard. And Knuckles felt it all going inside of him, there was an instant rush of heat so strong that it made him feel weak. The sensation became all the more prevalent in time with so much more blasting its way right into his guts, quickly taking up space within him. He felt and saw his stomach starting to inflate, having to make room for the seed that was getting injected into him while the length of cock and its thickness was plugging him completely, letting out a few thin drips at most. 

Glad that he was being held, Knuckles just took deep breaths and leaned back against Sonic’s warm, fluffy chest as he rode it all out, even as the feeling of all the cum in him was becoming hotter, heavier, and it was making him clench his hole even more against the shaft that was still releasing so much. This paired with the bite and the drool on his shoulder was making him melt all over again. 

When it was all over, Sonic finally unlatched his teeth from Knuckles’ shoulder and licked at the area, relieving Knuckles of the stinging sensation rather quickly then setting him down but Knuckles still leaned against Sonic, finding it hard to steady himself with the added weight of so much thick seed in him. Sonic seemed to understand because he let Knuckles lie down and padded around to curl up against him, using his large body and its warmth to stave off the chill in the air, providing so much comfort that the exhausted Knuckles was drifting off before he realized...