"Cannonball!" Tails shouted falling into the warm salty water. A wave pushed outward, splashing Knuckles and Shadow. Though normally more stoical, the two of them were eager to splash the fox back the second he emerged from beneath the water's surface. 

"Now!" Knuckles exclaimed, as he and Shadow pushed their arms forward creating a huge splash on either side of Tails just as his head peaked above the waves. 

"Ack!" Tails laughed, getting an extra splash by his friends. He giggled as the brash pair finally loosened up, letting themselves laugh alongside him. 

While it took some convincing, Tails had talked Knuckles and Shadow into joining him for a weekend on the beach. He knew Sonic would never agree given his apprehension to swimming. Knowing the older pair wouldn't pass up the opportunity to rub it in Sonic’s face next time they were all together, Tails figured they'd agree with some clever wording. Playing into their similar egos, Tails set up a perfect weekend away from the daily hero duties.
The young fox had found a perfect island on the way back from the last adventure. Secluded from the main coast, there was a rocky cove with white sand beaches, and a few caves to explore as well. The rush of the waves rolling in and out over the caves drowned out any outside noise, and made for a peaceful sleep at night. 

It was the afternoon before they were ready to head home, which gave them the perfect opportunity for one last big swim. Though they didn't really need to, each of the boys wore a unique pair of swimwear. Tails had a pair of loose fitting blue trunks. Knuckles wore a tighter pair of green trunks, which hugged his legs like a second skin. Shadow's choice was even more revealing, with a bright red speedo leaving nothing up to the imagination. 
Not that mobian males had obvious genitals. Their individual packages were tucked away in a modest pocket of skin and fur when not in use. Although, the round bump of a male's hidden package scaled larger or smaller for each unique individual. Shadow in this case had a rather big and noticeable bulge in his speedo even without being aroused. 
Knuckles similarly had a sizable, but slightly smaller bulge, while Tails' loose shorts respectively hid his small boyhood package. 

After a solid hour in the water, the three of them took to the beach, laying in the warm sand to rest. Shadow was quick to lay back and close his eyes. After 3 days playing with his two hot friends the black hedgehog knew he needed a little release eventually. Despite being the strong silent type, Shadow had a soft spot for other boys, especially Knuckles and Tails. While their friendships were always platonic, he secretly fantasized about them while getting off alone.

Knuckles on the other hand had mostly trained the libedo out of himself. So much time guarding the master emerald led him to repress his normally high sex drive. Even when release was necessary he didn't waste much time taking care of it. While he did swing both ways, it would take a significant push to get him turned on enough to keep up with Shadow.

Tails however, was a different story entirely. The young fox was gay and everyone knew it. He also hid his hypersexual desires until he could safely find a partner to satisfy his desires. Unfortunately his best friend and heroic partner Sonic (while supportive), was in a relationship with Amy Rose, and just didn't see his little buddy like that. As much as he really wanted Sonic, he was always out of reach in more ways than one. That didn't stop the golden pup from finding other boys to play with instead. He had found eager lovers in Ray, Charmy, Silver, and even once with Vector, although the gator's size made for a challenging night. Knowing enough about Shadow and Knuckles, this weekend beach getaway was actually his attempt at an elaborate threesome opportunity. From initially convincing the two of them the trip would spite Sonic, to choosing such a secluded location, he thought everything through perfectly. Well…almost perfectly. It was the last day and neither one of them had given in to his subtle hints and advances. Although Tails did notice Shadow becoming tense every time he bent over in front of him, Knuckles was a harder nut to crack. He wasn’t entirely sure if the red echidna was even open to being with another boy, but he had caught him giving his golden furry body a stare in the past. That suspicion alone made him assume Knuckles at least was curious enough for him to seduce given the right circumstances. 

Now ready to get down to business, Tails took a deep breath and decided to go from subtle hints to direct flirting and seduction. He had been lying between the two of them, enjoying the sun warming his golden fur. Sitting up he glanced up and down both of their bodies, slowing his gaze briefly on each of their sizable bulges. Licking his lips he finally broke the silence between them. 
"Thanks again for the company guys," he began. "I'm so lucky to have two hunky friends like you." 

"Heh," Shadow chuckled lightly. "Glad to see you recognize how ultimate I really am. Feels good coming from a guy who appreciates my finer side."

"Pfffft," Knuckles scoffed. "He said the same thing to me."

"Of course I did," Tails giggled. "You're both great looking guys!" 

"Heh, you're pretty easy on the eyes yourself you know," Shadow chuckled, opening one eye and glancing over.

"Awe," Tails blushed, knowing Shadow was now a dead lock for his plans. "Thanks Shadow." 

"Suck up," Knuckles grumbled.

"You jealous or something Red?" Shadow asked. "I could complement the obvious need you have to show off your bulge if you want?"

"Oh like those tiny red things aren't for showing off either!?" Knuckles barked back, pushing himself to sit up.

"Heh, sounds like you're jealous I'm bigger than you are."

"Guys, guys, both of you are plenty big," Tails jumped in, before things got too heated. "If anything I'm jealous of you guys. My stuff is really small by comparison." Making himself sound dejected and self conscious, he knew the other two would take advantage of his supposed embarrassment.

Sure enough, Knuckles and Shadow quit arguing and their eyes simultaneously glanced to Tails' shorts then back to each other. Both smirked getting the same idea. 
"Guess it's only fair if you show us then." Shadow grabbed the left side of Tails' shorts, while Knuckles grabbed the right.

"One," Knuckles said, counting down their quick prank. 

"Two," Shadow replied, a wide grin on his face. 

"Three!" They both shouted, pulling so hard both of them ripped a separate half off of Tails.
Tails yipped as he watched his trunks split in two and land in the water. The two halves quickly sank beneath the waves. Knuckles and Shadow each grabbed a leg, and spread the younger fox out, exposing his little lump, barely visible through his golden fur. 

"Ack! N…no fair!" Tails exclaimed, wriggling free and reaching both hands to Knuckles' waistband. Leaping upward he pulled the Echidna's tight trunks off surprisingly easily and chucked them into the water. They quickly joined Tails destroyed trunks at the bottom of the waves. Without saying a word Tails and Knuckles turned to Shadow who by this point stood up and was backing away. Both had devilish grins as their fingers twitched. 

"Oooook, guys, No need to do anything drastic here…AH!" Before Shadow could finish his thought, he had been knocked to the ground and his bright red speedo had been yanked from his body. It too was discarded into the depths of the ocean, while the three boys began wrestling around in the sand. Each of them trying to spread the other's legs apart in an effort to embarrass the other. 
After a few minutes of sweaty tumbling, the three of them fell back exhausted. 

"Truce?"

"Truce."

"Yeah, Truce." 

A short pause was followed by an eruption of laughter. Their legs were tangled together and arms tied in knots. 
"Hahaha, geez." Tails laughed. "I didn't know you guys wanted to see my junk that bad."

Shadow cleared his throat and blushed. "Well, uh…It's just us guys out here. A little healthy comparison never hurt anyone."

Tails giggled and looked at Knuckles. The echidna was even redder than usual, but was still trying to keep his cool. 
"You guys are pretty weird, you know that?" Knuckles said. "Fine, just don't go around telling the others I let you talk me into this."

Tails eagerly untangled himself from the others, and stood up. Shadow and Knuckles joined him, standing in a small circle. 
"Guess I'll go first," he said, reaching to his little bulge, and rubbing his right palm against it.

"Ugh, I can't believe I'm doing this with you guys," Knuckles grumbled, rubbing his own thick fur to coax out his boyhood."

"Relax Knucklehead," Shadow replied, joining them by rubbing himself. "Just us guys, right?" 

Tails giggled as he felt his member finally peek out. The crisp seabreeze dancing across his sensitive red flesh. Shadow and Knuckles awkwardly glanced over as the young fox became erect in front of them. Sporting a 4 inch cock, his balls barely hung below his knotted shaft, like two little grapes. "See guys, I'm not very big," Tails rubbed the back of his head with his left hand, in a simultaneous swelling of pride and fake embarrassment. He couldn't believe he had convinced them to get hard with him so quickly. 

Shadow was next to reach full mast as seeing Tails' boyhood caused his heart to begin racing. His dark fantasies were starting to become real. Shadow had a similarly red fleshy cock and tight sheathe, but no knot. It was a thick tapered length, which had to be at least 9 inches from base to tip. It pulsed, leaking precum prematurely. His balls were equally as impressive. Two golf ball sized eggs hanging low thanks to the warm air.
"What do you think of that boys?" Shadow boasted. "The ultimate cock if ever there was one."

"Whoa!" Tails gasped, not thinking about tact anymore as he reached over and grasped it. Pulling back his hand almost as quickly as he touched Shadow, he looked up to make sure it was ok. "S…sorry I just…"

"No worries Tails, go ahead and grab it," the dark hedgehog replied, folding his arms to his chest. Shadow could tell, the young fox was enamored by his impressive size. After all, it wasn’t the first time another mobian was eager to get handsy after seeing his boyhood. "What about you, Red? You wanna touch too?"

"Hrm, show off," Knuckles grumbled rubbing desperately at his bulge, struggling to get hard. 

"Hrm?" Tails let go of Shadow and turned to Knuckles. "You ok?"

"I'm fine just a little…uh…just…just give me a minute." Knuckles closed his eyes and focused on his body. He just couldn't seem to get excited around his friends. ("Come on, get hard, get hard, get hard,") he thought. 

"You want some help?" Tails asked, placing his left hand on Knuckles' shoulder. 

"Huh?" Knuckles' eyes shot open as he watched Tails get on his knees in front of him. The fox reached up and pulled the echidna's hands away.
"I don't mind if you don't," Tails muttered looking up into his older friends eyes. Knuckles was frozen. He already could see the look of the eager young fox and knew exactly what he meant. His heart began racing as his normally repressed sexuality came leaping out of the back of his mind. 

"O…ok." The words escaped his lips before he could even stop himself. Looking up to Shadow, the black hedgehog began gently stroking himself while he watched Tails lean into Knuckles' groin. 
"I…uh." 

Shadow stepped beside Knuckles and wrapped one arm lightly around the red echidna's shoulder. With his other hand he released his dick, and gently rubbed across Knuckles” chest. 
"Just relax, Red." 

Knuckles let out a long sigh and bit his lower lip as he looked from a suddenly seductive Shadow, down to his young gay foxy friend. Tails licked his lips and then opened his mouth wide letting his tongue slide across Knuckles' tight bulge. 
"Mmmmmm," Tails moaned through his breath. His boyhood twitching with delight as he got a taste of Knuckles' pubic fur for the first time. Working his flat tongue across Knuckles' body, he quickly found the seam where the echidna's package was hiding. Slipping past the tight folds, Knuckles gasped as his dick finally broke free from its prison, and slapped Tails across his face. 
"Whoa!" Tails gasped as he pulled back away from Knuckles, giving his older friend a chance to breathe. Tails giggled, staring at Knuckles' boyhood, as he stood back up and faced him. Shadow as well stepped back, giving Knuckles room to let his freed member flex to full mast.

Though he wasn't quite as long as Shadow, Knuckles still had a thick red cock, which measured a solid 8 inches. Its tip had a classic mushroom, which flared wide when he flexed. His balls, which eased from the bulge last, were swollen and heavy. It was clear he hadn’t gotten off in a long time. He panted as his gaze slowly rose from his swollen boyhood, up to his two now obviously horny friends.
"Uh…tada?" He said, shrugging and looking at just how different the three of them were. 

"Damn Red!" Shadow chuckled, folding his arms back to his chest again. "You never told me you were packing such a monster! That thing is a beast!" 

"Heh, you know it!" The sudden compliment eased Knuckles' embarrassment and he leaned back on one heel, with his fists proudly on his hips, and eyes closed. "I don't need your extra length to use it well, either. You'd be begging me to nail you right now if you knew how good I am."

Tails and Shadow glanced at one another with sly, lust driven eyes. They smiled and Tails nodded, knowing Shadow would know just how to get him going on that hypothetical "nailing."

"You wanna bet on that, Red?" 

"Huh?" Knuckles opened one eye and saw Shadow reaching forward for a handshake. 

"You think you're that good, prove it. Or are you too scared to fuck me?" 

"Oh you're on!" Knuckles grinned, slapping his palm against Shadow's. Finally loosening up, Knuckles glanced down at Shadow's dick. The black hedgehog was very well endowed indeed. It had been ages since Knuckles was intimate with another male, but he was still more than capable of pleasuring one.
"Now turn around you horny little shit!" Knuckles barked, gripping Shadow's hand tight and spinning him around. Grabbing his hips, Knuckles pulled Shadow against himself. Grinding his rock hard echidna cock against the hedgehog's backside and tail. 

"Huh?" Shadow gasped, not expecting Knuckles to start so quickly. As he felt his friend's dick touch him though, he smiled thinking about the coming attraction. 

"Oh wow that's hot!" Tails gasped, reaching to his own boyhood and rubbing it. He sat back in the warm sand and watched as Knuckles took control. 

Knuckles' shaft throbbed, leaking precum all over Shadow's ass. Shadow bit his lip feeling the thin liquid dripping down to his tailhole. Knuckles certainly wasn't holding back. He could feel the red echidna's cock slowly rubbing closer and closer to his entrance. Out of the corner of his eye he watched Tails rubbing himself while enjoying the show. Mostly though, Shadow stared down at the sand waiting for his friend to penetrate him. Knuckles smiled as he guided his tip down to Shadow's puckering tailhole. His cock head throbbed with delight and his heart pounded heavily with anticipation. Pressing against Shadow, Knuckles gave him just one short moment to prepare. 
"Here it comes!" Knuckles exclaimed and forced his thick cock past Shadow's tailhole. 

"Agh!" Shadow grunted as his body spread apart. It had been so long since he felt another boy inside himself that he'd nearly forgotten how it felt. Knuckles was THICK too! Much more so than any of his past lovers. He could feel his body quivering involuntarily as the red echidna pushed the remainder of his 8 inches inside. Shadow gasped louder as he felt his friend's hips slam against his backside, and their balls smack together. 

"Oh, yeah! You like that?" Knuckles moaned. He instantly fell in love with Shadow's hole. The black hedgehog's body perfectly squeezed his cock, sending waves of pure pleasure through his loins. He'd been inside plenty of boys before, but none felt as good as Shadow. Gripping Shadow's hips tighter, Knuckles began pumping in and out, loosening the hedgehog's tailhole for a rough series of thrusts. 

PLAP PLAP PLAP PLAP PLAP 

Knuckles slammed and grinded against Shadow. His heavy balls swinging against Shadow's, solidifying just how gay their actions were. Neither cared though, as they felt nothing but pure bliss in the moment. 
Shadow meanwhile could feel every inch of Knuckles' cock violating his body. The echidna's glorious boyhood rubbed hard against his prostate, and he could feel each throbbing thrust all the way through his own dick. It was like his tapered cock was being tickled from the inside. The sensation was unlike anything he'd experienced before with his previous male partners. Knuckles seemed to be perfectly equipped to give him everything his body desired. As much as he desperately wanted to win the bet, he couldn't help the words escape his lips…
"Oh Chaos! Fuck me harder Red! I need your cock!" 

"Haha," Knuckles laughed through his deep breaths. "Told ya you'd beg for it!" 

By this point Shadow's cock was dripping a near endless stream of precum into the sand. Tails was amazed at just how quickly Shadow had submitted and even more amazed how unbelievably quickly Knuckles jumped into wanting sex once they warmed him up. Although he quickly realized he wanted more than just to be passively cucked. Standing up he walked over in front of Shadow and grabbed him by his ears, lifting the dark hedgehog's head up. Shadow's eyelids were heavy, as he was lost in a trance from Knuckles' pounding. Tails pressed his wet tip against Shadow's lips and gave him one assertive word.
"Suck!"

Tails didn't even hesitate as he pushed his boyhood into Shadow's open mouth. 
"Hrmph!" Shadow's eyes opened wide as Tails buried his boyhood into his mouth. Finding it hard to do anything but accept another cock in his body, he swallowed his pride and let his eyes slowly relax as he rolled his tongue across Tails. Now getting slammed by Knuckles in the back and aggressively face fucked by the young fox, Shadow knew he wasn't going anywhere. 
Tails smiled as he guided Shadow's head up and down on his little cock. It felt so good having the hedgehog's tongue pleasuring him. He could tell his older friend was enjoying both giving him a forced blowjob as well as having his ass destroyed by a pent up Knuckles. Making eye contact with the echidna, the two of them leaned forward and gave one another a quick, but wonderfully sloppy kiss. It solidified their lustful actions and bonded the two further as they used Shadow's body for their pleasure. 

"I…hrmph…c…cu…hrmph!" Shadow moaned through Tails' cock. His whole body began to shiver as the pleasure had grown overwhelming. 

"Yeah, cum for us you perverted hog!" Knuckles barked, not letting up as he felt Shadow's tailhole clench around him. 
Shadow's cock throbbed uncontrollably as he was forced by his two friends into an explosive orgasm. His monstrous 9 inch member sprayed across the sand, splashing both on the ground and all over Tails' ankles. Tails giggled as he felt the ropes of cum painting him. Shadow's balls pulled up tight against his crotch as he continued to be milked of every last drop of his ultimate seed. 

The extra tightness around Knuckles pushed the already pent up echidna to his breaking point. Regripping Shadow's hips he thrust one more time as hard as he could, getting his cock as far into Shadow as he could. 
"Fuck yeah!" Knuckles shouted as his balls lifted up and his body tensed. The red echidna blasted an enormous amount of cum deep inside Shadow. He could hardly remain standing as his thick cock shot load after creamy load. 

Shadow let out a long moan through Tails' cock and his eyes half rolled back in his head. He instantly felt the pressure building in his stomach as Knuckles filled his ass. It built up so fast he felt the cum flood around Knuckles and spray the excess back out. There was just so much, even the ultimate lifeforms couldn't hold it all. Not to mention he was still spraying his own load at the same time. 

"Oh man, this is so hot!" Tails exclaimed, now grinding his knot against Shadow's muzzle. "I…I think I’m gonna…CUM!" 
As it seemed, Shadow wasn't getting any reprieve from Tails either. The young fox pushed his knot into his mouth, and the tip forced down his throat. Luckily given Tails' age he didn't produce much semen, and what he did have was notably thin as well. Not that it made it any easier to swallow, but Shadow still managed to gulp down everything. After 4 quick spurts, Tails let go of Shadow's ears, and fell back into the sand. His boyhood popped out of Shadow's mouth, giving the hedgehog a chance to breathe. 

Gasping for air, Shadow felt the last of his and Knuckles' cum shoot out. Knuckles, like Tails, fell back in exhaustion leaving Shadow to collapse on his side. Cum continued pouring out of his tailhole as the three boys caught their breath. Shadow was completely wrecked from the pleasure he had just experienced. He wanted to snap at both of them, but despite being so aggressively violated…he loved it! He couldn't believe it took him this long to have sex with his friends. 

Knuckles lay back with a wide grin across his face. Not only had he won their bet, he had discovered the joy and incredible pleasure of cumming into his friend. Thinking about how much he previously kept his urges bottled up, he decided he wouldn't let that happen any more. Next time he felt the need, he was certain Shadow and Tails would help him out.

Tails laid in a state of pure bliss. He not only got to have sex with his hot friends, but had also opened them both up to even more remarkable pleasures. While he may have only face fucked Shadow, he was more than satisfied with their little vacation to the beach. 

As Shadow finally caught his breath, he rolled onto his back and pushed himself next to Tails. Seeing what he was doing, Knuckles joined them, and snuggled up on Tails' opposite side. Knuckles placed one hand on the young fox's chest, while Shadow cupped a hand under his cute little package. 
"Tails?" Shadow asked, "Do you think we can stay just one more day?"

Tails giggled and looked at Knuckles. "Is that ok with you?"

Knuckles nodded and returned a smile. 

"Ok then. One more day with my hot boyfriends." 
The trio, completely exhausted, laid together in the sand as they rested in each other's arms…until they were ready for round two.