"Alviiiiin... do I really have to wear this?"

"Oh relax Theo, you look fine! Just don't think about how you're wearing girl stuff and you'll be fine."

Theodore just mumbled under his breath, arms crossed over his chest. "How reassuring..."

Thank goodness not many people would have seen him.

Theodore let out a little huff as he exited the changing tent after waiting a few minutes since Alvin exited. Why did he let himself be talked into things like this...? At least they were set up on a more secluded spot.

Summer was nearly over, and thanks to Alvin's constant suggestions(as well as pleading), Dave had brought them out to spend one of their last summer days at a nearby beach.

Theodore purposely waited until Dave had seemingly fallen asleep beneath their umbrella before he went to change into his swimwear. He now wore a simple one piece swimsuit, with an open back area that stopped just above the base of his spine. The problem wasn't that he couldn't fit it; Alvin had picked one out that fit him nicely, actually. The problem was that it fit too well. It didn't take a genius to tell that he was bulging the front slightly, whether it be with his chest, belly or crotch. And all too obvious was how much the swimsuit clung to his rear.

Needless to say, he was glad that Simon had opted to spent most of his time out in the water.

Now he was off to himself, sitting on his soft green towel as he tried to focus on building up a sand castle. He knew Alvin would be coming eventually. He had told him to wait here. This spot wasn't all that hidden, so maybe they wouldn't do too much?

He had managed to get a good castle going until...

"Hey! Theo!"

Theodore gulped softly as he looked to the voice's source. There was Alvin, not too far away from him and closing the distance quickly.

'He looks so good...' Theo thought as Alvin came to a stop right in front of him. Bright red swim trunks decorated with bright yellow flames. The rest of his body was on full display, a slight amount of sweat glistening in the sunlight in his short fur. Of course, he still wore his usual baseball cap, which he tilted down as he squatted in front of the castle. "Getting sand all over your butt, I see?"

"Heeeyy... I don't have sand on my butt!" Theodore huffed, gesturing to his towel. "I'm all clean!"

"Oh, good. Now then, you ready to go? Dave's fast asleep and Si's not gonna bother us." Alvin stood up again with a "Hup!" then planted his hands on his hips. "Okay! So, you lay down on your belly. I'll get you ready." Alvin directed.

Letting out a little huff, Theodore nodded as he laid on his stomach, his head resting atop his arms as he waited. "A-Alvin... Can we get it done quickly this time? We're out in public..." He mumbled, tensing up a little as Alvin got down behind him. His body shivered as he felt Alvin's hands running along his sides, gently squishing him every now and then.

"Heheh... Now now, Theo. Don't sweat it. We've got all the time we need." Alvin cooed, hands moving down until they rested on Theo's rump.

Theodore gulped nervously, but kept himself in place as Alvin felt him up. All the squeezing, kneading, and prodding he did... he was glad he was laying on his belly. His shaft was already pulsing with life against the towel. Theo let out a little moan as Alvin continued to tease him, now nudging the seat of the swimsuit aside, exposing one butt cheek. You have no idea how bad I wanna just tear this off of you and have fun~" Alvin said with a little growl in his voice.

Before he could reply, Theodore had to stuff his face against his towel, his eyes shut tight as he moaned into it. Alvin moved his suit off to the side a little more, and now he was running a finger along Theo's butt crack, making sure to poke into that soft pink hole every time it passed over.

"Nngh! A-Alvin, please..." Theodore complained, lifting up his butt instinctively as Alvin continued to mess around with his hole. Once it was breached, Theo had no choice but to bite his towel again, moaning as Alvin went to work, his finger pumping in and out of his hole with ease.

"Alvin what? You've been fingered before." Alvin's reply came with a sly smile. While he was fivgering Theodore, he wiggled out of his swim trunks, letting them drop in the sand as he mounted his baby brother's face, his semi hard shaft plopping down on Theodore's nose. "Now open up. The faster I get hard, the faster you get my spunk in your butt."

With a blush spreading over his cheeks, Theodore nuzzled a little closer to Alvin's length. His scent was welcoming to him, a mix of his fur's usual smell mingled in with a slight hint of sweat and musk. A shiver ran down his spine as he opened up his mouth, now suckling on Alvin's tip, muffling his moans as Alvin continued to loosen him up. "There ya go... Good Theodore!" Alvin praised, letting out a low moan of his own as he pulled his finger out. "Now you're gonna really love me." With that, Alvin spread apart Theodore's cheeks as much as he could, then lowered his head in order to drag his tongue around his little brother's rim.

Unable to complain, Theodore was left to moan around his big brother's shaft, trying to take more of him in as he reached up a shaky paw, lightly squeezing Alvin's butt. He winced a little as Alvin's tongue pushed pass his outer ring, delving into his rear and wiggling side to side. Theo's other paw gripped at the towel firmly, feeling the sand beneath it crunch as he tried to lift his butt higher.

He had to admit. Even when Alvin didn't give him a warning, he still enjoyed their time together. Who wouldn't?

"Gah... Dang it, Theodore." Alvin huffed, tilting his head enough so his front teeth pressed down on the covered half of Theo's plump rear, giving him a light bite while thrusting his hips forward. The sound of Theodore gagging softly urged him on, bucking his hips at a slow pace. "C'mon, you've had it in your mouth before~" Alvin groaned, sinking his tongue deeper in Theo's clenching walls.

Theodore whined as he wiggled his butt against Alvin's face. Alvin had started leaking precum, and it was pooling up on his tongue. He didn't mind swallowing it, but at this point he was completely hard, his own length throbbing as it tried to slip out of the swimsuit. "Mmh! Gmph..." His hold on Alvin's rear got tighter as he pushed his rear up higher, getting enough room to sneak his paw down between his legs. Luckily, Alvin didn't object to him pulling at the seat of his suit again, sighing in relief through his nose as his cock and balls fell free, pulsing against the towel.

"Feel better now?" Alvin asked, moving from Theo's tailhole in order to spread apart his cheeks a little more, watching his little hole quiver and clench around nothing. "Let's see how long it takes for you to pop this time."

"Mmnh?" Alvin pulled out of his mouth and climbed off of him, giving him time to catch his breath. "Gaah... W-What do you mean, Alvin?"

Alvin crouched down behind Theodore, pulling him closer until his lower half was laying out on the sand. "How's the sand? Not too hot?" He asked. Not waiting for an answer, Alvin smacked his rear, making Theodore yelp out and moan immediately. "That's what I thought. Now get your dick in there." Alvin ordered, mounting Theo from behind.

"Aah, p-please, please Alvin...!" Theodore whined out as he did as he was told, wiggling his hips until his length was completely buried in the warm sand. He bit down on the towel again as Alvin prodded at his hole, the tip of his shaft just barely pushing into his rim. "Please don't tease me!"

"Someone's been working on his begging." Alvin's comment made Theodore blush more. "But sure. Not my fault if it hurts" And with that, Alvin gave a strong thrust forward, half of his cock piercing through and sinking right on into Theo's tailhole, making the chubby munk's jaw drop in a loud moan. Alvin had to hurry and stuff some of the towel into Theodore's mouth just to keep him quiet. "J-Jeez! Keep it down or you'll wake up Dave!" Alvin hissed.

Theodore whined and nodded his head, trembling and gripping at the towel as his shaft pulsed hard in the sand, oozing out his sticky precum as he shook his hips. "Hmn... mrmmhf." He moaned, his hole still clenching around Alvin's throbbing length.

"There ya go... Good Teddy. Now stay down and shush up." Alvin said, moving his hands up Theodore's body to caress his chest, glancing around to be sure they weren't being watched before he started humping. "Ahh yeah... Just lemme get a goood rut going..." Alvin moaned, closing his eyes as he loomed over Theodore's body.

Alvin continued to move, his slow and steady humping easily loosening up Theo's hole, letting him pick up speed steadily. All the while, he was spurting precum against his walls. "You ready to stay quiet?" He asked, lowering his head to kiss Theodore on the cheek. "Mmmhm..." Theodore's little whimper was enough of a sign. Alvin planted his feet down into the sand as much as he could manage, toes curling against the gritty stuff as he got rougher, ramming himself deeper inside of Theodore, making him squeak and moan as the towel fell from his mouth.

"Grf, just let me know when you're gonna cum." Alvin growled, giving Theo's shoulder a gentle bite, grunting as his hips met Theodore's butt with a light 'slap' sound. "I wanna see it happen, Theodore. So don't let it out early!" He said, already panting away as sweat built up on his brow.

Hearing Theo's moans were enough to keep him going. How could he not throb harder and harder just hearing those squeaky little sounds of bliss~? Alvin gripped Theodore's chest through the swimsuit, kneading around the spot while he picked up speed again, now making Theodore's body rock back and forth against the sand.

"Ooh... Oh my gosh, Alvin!" Theodore bowed his head, resting it on the towel as he moaned and curled his toes. The sand around his length was both helping and hindering his orgasm, but it still continued to creep towards him, threatening to spill over at any moment. It took everything in him to keep it inside. "I'm tryiiing... But it feels so good!" He cried out, quickly quieting himself by taking a quick glance across the beach. From what he could tell, it look like Dave was stirring slightly...

'Bad idea... bad idea!' Theodore thought, wincing as he leaned into Alvin's rough pounding. The idea of being so sneaky, yet so exposed and open, having the chance of being caught in the act... it made his shaft throb harder in the sand.

Alvin grunted softly above him. "Nngh, you got tighter." Alvin huffed. "What're you thinking of, Theo?" He asks, a sly grin on his face as he looked down at Theo's face, stirring his hips around slowly. "You thinkin' about Eleanor again~? Ya wanna have her under you, moaning out loud juuust like you are?" Alvin egged him on, removing his cap and placing it atop Theodore's head. "You naughty dude, you~"

"L-Leave me alone!" Theo squeaked. Alvin was grinding up against a tender spot, the warmth of his slick pre only making the bliss more intense. "Stooop... I'm not gonna squirt!"

"Sounds like you are. So ya better do it fast or else I'll be finished with you sooner~" Alvin teased him, reaching around in order to grab Theodore's balls, fondling his tender sack in paw as he pounded into him harder, making his little brother hump into the sand.

"A-Aah, Alviiin!" Panting away, Theodore had to hide his face in the towel, a strong shiver running down his spine as he felt his shaft beginning to pulse as hard as possible against the sand. He could hardly stop himself from squealing as his orgasm slammed into him, his body seized up in bliss as he started depositing his sticky strands of seed straight into the soft sand below, moaning and trembling all the while. Of course, Alvin's persistent pounding didn't help either, only prolonging the waves of bliss that rocked his body.

By the time Theodore was having his afterglow, Alvin pulled out of his rear, his shaft still dripping precum as he picked up his exhausted brother, carrying him further up the shore. "Mmf. You're getting so heavy... But you're worth a butt covered in sand." Alvin said as he plopped back down.

Now, the two of them had a full view of the sea, the sunlight still gleaming against the gentle waves. No sign of Simon though... Maybe he was in the changing tent? Either way, Theodore couldn't exactly relax with Alvin trying to undress him more.

The straps on his shoulders were first to go. Then Alvin nudged the actual suit down until most of Theodore's belly was exposed, a pleased grin on his face as he started grinding himself on Theo's loosened hole. "My turn to cum." He said plainly, shoving his cock back into that warm, welcoming tunnel before Theodore could even say anything.

"Nnh... Alvin, please cum in me..." Theodore begged, his head bowed as he tried to bounce into Alvin's humping. Even with his length coated in seed and a bit of gritty sand, he tried his best to get Alvin off as quick as he could.

Thankfully, the effort was appreciated. Alvin's grunts and moans grew louder each time his body met with Theodore's. "Ohh yeah, Theo, keep it up!" Alvin huffed, putting his paws to his little brother's hips, squeezing them lightly as he stirred his length around before picking up speed. "Oh gosh... It's comin'!" Alvin groaned. "Theodore, I'm gonna fill you up!"

Hearing that, Theo quickly braced himself, his eyes closed tight while he pressed his feet into the sand, curling his toes instinctively as he rode Alvin's length desperately. He didn't have to wait much longer. Alvin's words proved true when he suddenly took hold of Theodore's body and stood up with him, his muscles straining to hold up the pudgy munk as he buried his cock in all the way, making quick, short thrusts as his load of cum began to squirt out, painting Theo's inner walls a milky white with each spurt.

With each shot's impact, Theodore twitched slightly. Both pleasure and surprise was on his face, mainly from Alvin's sudden burst of strength. He almost came again just from that.

Once Alvin's climax died away, and afterglow begun to take hold, he dropped Theodore back down to the towel, huffing as he ended up falling to his knees, leaning forward until his head rested on Theodore's back, panting against his short fur. "Ah... That was a good one..." He said aloud. "Oh, uh... I'll help ya cover up Theo. There's some cum on your swimsuit."

"I-It's alright." Theodore raised up his head, glancing out at the sea again. He squinted a little, shielding his eyes from the sun's light as he tried to focus. "Uh... Alvin? I think Simon saw us." He says softly, his cheeks turning a dark pink as he blushed. "I saw him, uh..."

"Oh, don't worry Theo. We're just gonna have to show him a thing or two for spying." Alvin commented, scooting back a little so his head was resting atop Theo's cum leaking rear. "When we get back home though. I'm just gonna relax here for now."

Theodore pouted a little, but nodded his head. 'At least he can't tell on us if he gets in on it.' he thought to himself.