Shining Armor squirmed in his seat.

The train he’d taken out of Canterlot Station was moving somewhere around twenty miles an hour, having just picked up speed after leaving the city limits. Outside the window, Shining could have seen the Canterlot countryside flying by, complete with sunny skies, golden fields, and snow-topped mountains in the distance.

Each bump of the train on the tracks, though, brought to mind another thing entirely. Shining winced again as he felt his seat jostle against a particularly sensitive part of his rump. It wasn’t a wince in pain - entirely the opposite, in fact.

On his lap, a prominent bulge was clearly visible rising through his pantleg. Big Macintosh may have been the biggest stallion Ponyville had ever seen, but if anyone had looked at Shining’s lap right then, they would have second-guessed even the big Apple’s superiority.

A long, thick bulge ran from his crotch almost all the way to his knees. An unobservant pony would have thought at first glance that Shining just had a particularly thick left thigh, but here on the train, with the constant vibration setting his arousal alight, there was no mistaking the long, hard shaft throbbing against the fabric, and against Shining’s leg.

Shining let out a short gasp as the train went over a bump in the rails, his crotch involuntarily flexing and then releasing. It was a only moment later that he realized his package had started to drool; it was only the wet spot underneath his hand that tipped him off at all.

“Dammit, dammit, dammit,” he muttered, then blushed as he noticed a motherly-looking mare glaring at him from across the aisle. “Sorry, sorry.”

He reached down to his crotch to try and get an idea of the damage control - and then gasped as he felt his hand brush against his balls. They were incredibly sensitive to the touch, and swollen to boot. He could feel them easily through the fabric, could almost feel his seed sloshing about inside.

Meanwhile, his cock continued drooling. Shining’s smile quickly became forced as he felt globs of pre soaking through his good officer’s pants, his stallionhood throbbing every few moments for good measure. He tried to prod one of his balls again and nearly moaned in pleasure, a new spurt of precum gushing out and drooling down the side of his leg as he struggled to keep himself - and his legs - together. By now, there was a fairly noticeable puddle on the floor beside his shoes. He shivered as he moved his foot to cover it with a loud squelch.

“Hey there,” he heard a voice say from behind his shoulder. Another stallion. “Looks like every other seat’s taken. Mind if I take this one?”

Shining nodded slowly, hardly trusting himself to speak.

Shit.

Wait. He frowned. That voice sounded familiar. It couldn’t be -

“How’re you doing, Shining? It’s been a while.”

Shining slowly turned his head, a grin plastered on his face, and looked directly into the gleeful eyes of Lieutenant Cloud Runner of the Canterlot Guard.

“Cloud!” he said with false enthusiasm. “How’ve you, er, been?” His legs tensed up as another spurt of pre spurted through his stallionhood, moistening his pants even further. Gods. These clothes would be all but unwearable by the time he reached Ponyville - heck, he was already thinking of burning them. Celestia only knew that there’d be no other way to get rid of the musk.

Then again, he was already dreading what was to come. If Cloud was anything like he remembered - and Cloud remembered anything about their training days - then this was about to get a whole lot more awkward.

“I’ve been great, buddy. Just peachy.” Cloud happily took a seat and patted Shining’s right thigh - not, Shining noted gratefully, the one currently drowning in precum - and grinned. “Looks like you’re still working out, huh?”

“Yeah,” Shining said through gritted teeth. “Somehow.”

“Very nice,” Cloud said approvingly. He gave Shining’s thigh a little squeeze. Shining bit down hard to keep his whole lower body from spasming, and contained a yelp as he bit down on the inside of his cheek instead. “So, I heard you’re royalty now, right? A real king, from that place up north? Or is it empire?”

“Prince,” Shining managed to bite out through the pain. “Technically.” His breaths came in short, stuttered gasps, his cock now throbbing appreciatively. He could still feel Cloud’s touch on his inner thigh, even though the other stallion had already removed his hand. He could still feel, somehow, Cloud Runner’s fingers running up his thighs, the other stallion caressing his crotch with one hand and roaming up Shining’s chest with the other. He could still remember when two trainees would meet in the middle of the night, each discovering the other’s body.

He could still remember the face that Cloud had made when he’d seen the true size of Shining’s genitalia for the first time - and the face he’d made soon after when he’d seen the mess Shining could make. Right on cue, his member chubbed up even further, which Shining had previously thought impossible; now, his stallionhood had reached his knee, and was steadily leaking pre onto a growing puddle on the floor. He kept his face as neutral as he could and stared straight ahead, refusing to meet Cloud’s eyes.

“A prince, huh?” Shining could almost swear that he could feel Cloud Runner’s hot, moist breath in his ear. “Man, that’s pretty impressive. What’s a bigshot like you doing all the way down south?”

“Visiting my sister in Ponyville,” Shining said. “She invited me down to see her new house.”

“Twilight Sparkle, right?” Cloud Runner snapped his fingers. “Y’mean that new castle that just erupted out of the ground down there?”

“Yeah,” Shining said. He was getting close to panting now. His pants had been completely soaked through by now, and he had no doubts that his underpants and at least one of his shoes were completely ruined. He felt another throb in his crotch and winced. It seemed his swelling balls had finally pushed up against the limit that his pants could possibly provide. “I’ve heard it’s...uh, really nice.” He made a futile effort to adjust his posture to provide more room, but all it really seemed to do was massage his overproducing balls even more.

“I’ll bet.” Cloud put a hand on Shining’s thigh again, but this time, he didn’t remove it right away. Instead, he slowly began to move it up Shining’s leg, toward his soaked crotch. “I’ll bet you remember another, even nicer ‘castle,’ don’t you?”

“Mmff,” Shining grunted, almost moaning. “Not...now.” He glanced up to the little sign at the front of the carriage highlighting the next stop. Ponyville, one mile. Almost there. He’d get off the train, rush straight into the bathroom, and relieve himself as soon as he could. He’d even stick around to help clean up the miss. He just had to keep control for a few more minutes. Just hold off on that release.

“What?” Cloud asked innocently. Shining could hear him lick his lips, an audible “smack” that brought back all too many memories that set his cock throbbing anew. “Not what? Not...this?”

His wandering fingers had finally reached Shining’s crotch. With a devilish grin on his face, Cloud gave Shining’s oversized balls a squeeze. Across the aisle, Shining could see that same matronly mare sniffing and turning away, presumably in disgust.

“Yes,” Shining squeaked out. “Th-that.”

“Or what about this?” Cloud laid a casual arm around Shining’s and gently massaged his side as his other hand moved toward the base of Shining’s throbbing, enormous cock. By now, the puddle of precum had covered most of the floor beneath their seats, and Shining’s shoes had both become entirely soaked. “Is this okay?”

“Cloud,” Shining croaked out. “Don’t you dare - “

“Dare what?” Cloud asked innocently. “Do...this?”

He squeezed Shining’s cock.

Shining’s head flew back as his entire body arched in one electric, shuddering motion. His sodden pants ripped right down the side, his rock-hard cock tearing its way out and up into the air. His enormous, cum-filled balls exploded free from their fabric-covered prison, their sloshing depths actually managing to push Shining’s legs apart. Blast after blast of hot, white, sticky jizz rained down on the cabin until every seat within a ten-foot radius was covered in white.

Shining moaned and grunted, panted and wheezed as the orgasm took him, his cock throbbing with each thick rope of cum his massive balls put out. His eyes nearly rolled back into his head as pure sensual overload overtook his every sense.

When he opened his eyes, the entire cabin was covered in white. His shirt was drenched and absolutely ruined. Most of the other passengers were looking at him with expressions of either shock, disgust, or vague arousal.

With a hiss and a whistle of steam, the train came to a shuddering stop. Shining just sat there, eyes wide, mouth hanging slightly open, as the doors at the end of the car opened up.

“All aboard!”

“Well, looks like this is my stop.” Cloud got up from his seat and grinned down at Shining. “Maybe I’ll see you around town, huh? Your majesty.” With a mocking bow and a lick of his cum-covered lips, he turned around and strutted down the aisle.

Shining just sat there, his deflating package weighing down between his legs. The overwhelming sense of bliss still filled his system, but a feeling of horror was slowly dawning on him at well.

A cough. Shining looked up at the conductor. The other stallion was glaring down at him, his face contorted into a scowl. For the second time that day, there was only one thought in Shining Armor’s mind.

Shit.