(I noticed a pattern lately. You have a Master fetish, don't you? Then again. I'm no better as basically my entire works consist of feminine males. So... :/)
"Junior, I assure you. I am fine." An older male's voice said, one that was in his teens.
"Yeah, no. I don't believe you. You've been working non-stop dude. It's not healthy." Said a younger voice, probably in the cusp of puberty.
"I can't believe I'm being lectured by you of all people, Junior." Replied Ludwig, staring at his youngest brother in disbelief.
"Yeah, well. Deal with it. 'Cause it's true." Finished Junior, as if that settled the whole discussion.
Junior has noticed that his eldest brother, Ludwig has been more worked up and stressed than ever. He was always working, always helping with plans and making his own music. It was starting to take its toll on the dark blue haired Koopaling. Ludwig already has too much on his plate as it is.
So, Junior decided to make a decision after being invited to his room (or, more likely breaking in unannounced). Which led to where they were now.
"... A... vacation?" Ludwig said as he digested what his youngest brother explained to him. Bowser Junior nodded and crosses his arms.
"Yep! You've just been too busy, it kinda looks like you'll explode any moment! Haven't you ever taken a break before, Luddy?" The young Prince asked him.
Ludwig was annoyed by the nickname given to him, but he had already given up fighting to change it a long time ago and just accepted it. Back on topic, he thought about it. Aside from some holidays and times when they just relaxed... His silence said it all.
"Oh, damn. That's BAD. Right, Operation: Chill Out Ludwig is a go!" Junior said as the eldest simply rolled his eyes at the name.
"That's all well and good, Junior. But where should we even go? Not many people take kindly of our antics. Well, father's antics, but still." Ludwig says, and the young Koopa realizes he brings up a good point.
"Well, that's where I come in! I'll come up with something and it'll be the best vacation you'll ever have! I'll join you so you don't get busy again." Junior replied.
'More like making me worked up even more, you mean.' Ludwig thought to himself, he didn't say this out loud. But it was kinda nice that his family cared about his wellbeing. In retrospect, he kinda feels bad. Maybe Junior has a point.
"Alright, fine." Ludwig reluctantly accepted. "So, where exactly are we going?"
Junior pondered on this. Hmm… A place for just them… Isle Delfino? No, they've been banned there. A resort? Nah, none of them in the Mushroom Kingdom would accept them after everything they've done. What to do, what to do…
Eventually, an idea came to him. "I've got it!" Junior proclaimed before giving off a toothy grin. "I've heard legend of an island that hasn't even been touched for years! Maybe we could head there?"
For obvious reasons, Ludwig was skeptic. An island like that sounded pretty damn fishy to him. Besides, where had Junior heard about these legends? Either Junior's sources were faulty, or he was making them up. However, it was far too late to go back on this now. Who knows? Maybe it'd be worth it.
"I guess that's where we are heading." He said. "How are we getting there, anyway?"
"In our Koopa Clown Cars, duh!" Junior replied. "Now, c'mon! We don't have all day!"
Ludwig tried to interject, but Junior was already out the door. Presumably to the garage where the Clown Cars were kept. Ludwig sighed. 'This had better be worth my time…' He thought before following after Junior.
[…]
Sometime later, Junior and Ludwig were high in the sky flying their Clown Cars to the aforementioned island. (Junior leading the way, obviously) Still, Ludwig had many questions. Where had Junior heard about this from? Had he been there himself? And most importantly…
"Does this island have a name?" Asked Ludwig.
"Hm? Oh, yeah. They call it 'Walaborne Bay'." Junior explained. "If I remember correctly, nobody set foot on the island for a long time. So there might be a lot of plant life growing about."
Walaborne Bay? Why had he never heard of this place before? For that matter, how on Earth did Junior find this place?
"And you know this, how, exactly? Are you telling me you've been here before?" Ludwig asked the younger Koopa prince. Junior just shrugged as they got closer to their destination.
"In a way. We basically have the whole place to ourselves!" Junior replied, however, Ludwig still felt a bit uneasy.
He's never heard of this island, much less been here. Usually he was pretty up to date on certain things, but for once, he was basically going in blind. And he's leaving this up to Junior of all people.
'I'm really going to regret this. This vacation better be worth it.' The eldest Koopaling thought to himself as they landed and looked around.
Like Junior said, the island was full of trees, all sorts of different types of plants, and aside from them, nobody else was there. …So far, at least. Ludwig turned to Junior. "Is this it?" He asked.
Junior nodded. "It sure is!" He answered before pointing ahead of him. "There's actually a swimming hole over there that I personally enjoy. I was thinking that we could head there before exploring the island a bit."
Ludwig raised an eyebrow. "Are you saying we came all this way just to swim?" He asked. Growing slightly impatient.
Junior shook his head. "Not just swim. There's also a waterfall, some ruins, and even an abandoned campsite that might be worth exploring."
This just made Ludwig even more skeptic, and even a little nervous. An abandoned campsite sounded utterly horrifying! Why did he agree to this, again!? But… Junior DID do all this for him; the least he could do was accept further. "Fine. Just lead me to it." Was all he said before he and Junior walked towards the aforementioned swimming hole.
Eventually, they made it to a clearing. The hole itself was fairly big and full of clean, sparkling water. However… Ludwig couldn't shake the feeling that this wasn't just a normal swimming hole. Dipping his hand into the water, he found it to be lukewarm. Okay, so far so good…
Suddenly, Ludwig heard Junior chuckle slightly before pushing the eldest Koopaling into the water. Thankfully, he was good swimmer so he was able to quickly get back on dry land and cough a bit.
"What the hell, Junior!?" He yelled. Junior just grinned mischievously as if he set a trap for Mario.

The silence enraged Ludwig. That does it! Screw this vacation, screw Junior, and screw this island! "We're heading home! NOW!"
"Aw, cheer up, Ludwig! It's just water!" Junior laughed. This did nothing but anger Ludwig even more.
"I don't care if it's 'Just water'! We're lea… Ving…?" Slowly Ludwig's anger faltered as his mind began clouding up. What was in that water? He felt… Drowsy.
Junior grinned as Ludwig began swaying back and forth as if he was drunk. "Sleep tight, Luddy~" He said before his brother's vision went black.
Later on, Ludwig slowly reawakened. How much time had passed, he had no clue. Wait… Where the hell was he?! Looking around, he found himself in the middle of a different clearing than the swimming hole. There were tents, a fire pit, a few coolers, and he was strapped down to a chair with some tight vines.
Ludwig struggled to break free, but found himself unable to. If this was a joke, it surely wasn't funny! At all!
"Junior!" He called out. "Where the hell are you?!"
The last thing he remembers was Junior pushing him into that weird water that made him drowsy, and now... he was here. Wherever here is. He struggles to break free, but the vines were surprisingly strong.
"Okay, you had your fun, Junior! Now, untie me so we can end this nonsense!" Ludwig called out. He should have known this was too good to be true. Leave it to Junior to net him into some trouble yet again.
"Relax, Luddy. This is for your own good~" Said the all too familiar voice of Junior.
"Being pushed into basically drugged up water and held hostage, isn't exactly my idea of a 'vacation'! Now, release me this instant and MAYBE I won't tell King Father about this!" Ludwig was getting increasingly annoyed by this.
He should have just stayed back home, refused Junior and be back in his room, composing new songs. But nope. He had to be dragged along, like usual.
He heard Junior laugh again before he revealed himself from behind one of the tents in all his glory. "What's the meaning of this!?" He exclaimed. "And what did you mean by for my own good??"
Junior eyed Ludwig up and down. Just what was he planning? "I couldn't help but notice your figure, Luddy~" Ludwig blushed furiously. What the hell was that supposed the mean?! "This was too much of an opportunity to pass up! I'm gonna enjoy this~"
…Enjoy what? Oh no. Oh FUCK no! He wasn't talking about…?
Ludwig's thoughts were cut off by Junior revealing his dick. Instantly, his sheer anger turned to utter terror. It was huge! His own penis felt inferior in comparison. Junior let out a hearty and evil laugh. Completely oblivious, or at least ignoring, his brother's panic.
"Get your mouth ready, Luddy~" Junior said cruelly.
"N-No!" Ludwig panicked. "I refuse to partake in such actions!"
Junior smirked. "I COULD just leave you here." He said in a teasing tone. This made Ludwig panic. Here on this island? Alone? Strapped to this chair until they day he'd die?! That was even worse!
"You little…" He cursed under his breath before speaking aloud. "Fine. I'll do it."
Junior grinned evilly. "That's better~ Now then, I hope you can take it all~" He said before approaching his tied up brother and slapping his cock across his face. "Get to it, Luddy!"
Ludwig glared at his brother and opened his mouth, taking the head of Junior's cock inside. Seemingly with no other choice, he obeyed and played along. Maybe if he satisfied his horny little shit of a sibling, this will be the end of this. Besides, he already has plans for payback after this.
"Mmmm... that's it... You like that? You like the taste of my Koopa dick?~" Junior says, grinning with some smug superiority.
'Ugh. His dirty talk is terrible.' Ludwig thought, mentally rolling his eyes at Junior trying to talk sexy. He felt the other male moving his hips, thrusting into his mouth.
"Ahh... Maybe this'll help ya unwind~ It's certainly working for me!" The young Koopa Prince giggles, much to the annoyance of Ludwig who was basically forced to take it.
'Just shut up…' Thought Ludwig as he continued to taste more of Junior's cock. As he expected, it tasted terrible. But still, he didn't want to be left behind…
"Mmmh~ Aah! So fuckin' good~" Junior moaned before thrusting harder into Ludwig's mouth. "Mmgh! Take my cock, Luddy!"

Ludwig's eyes widened in surprise. Holy shit, he was relentless! In fact, was he always like this? Matter of fact, how long had he been planning this? Whatever. When they got out of there, Junior would surly pay for this!
Junior began leaking pre. "G-Getting close!" He groaned. "You want my cum!?"
'No, I want you to get off of me!' Ludwig complained in his mind before squeezing his eyes shut. Bracing himself for what was about to happen. After a few more harsh thrusts, Junior finally came. Moaning loudly as he did so. Reluctantly, Ludwig gulped down Junior's cum. As expected, it was utterly disgusting. He just wished he never agreed to this farce!
When he was finished, Junior slowly pulled away and allowed Ludwig to not only breathe, but cough. "Phaa! Hah… Th-There, I… Hah… Sucked you off!" He exclaimed in-between breaths. "Are we done now?"
"Hmm…" Junior hummed before shaking his head. "Not just yet."
Ludwig growled. For how long would he keep this up!? "What, was that not enough?! What else can you possibly do to me!?" He exclaimed. Trying to put up a tough front, but deep down inside, he was a little afraid of what else Junior had planned.
Junior kicked over the chair, making Ludwig yelp as he landed on his back.
"Wh-what the hell are you doing?!" He yelled out, wondering what else the little brat had planned for him.
"Remember when I said that I admired your body, Luddy?~" Junior said and then it all clicked. Ludwig stared at him for a few seconds before narrowing his eyes.
"You wouldn't dare." He said, his voice low and filled with venom. But he also noticed. When Junior kicked the chair over, it loosened the vines. He already has the perfect plan. He'll play along and lower the other male's guard.
Junior approached Ludwig and positioned his cock at his older brother's entrance. Poking and prodding with the tip.
"Oh, I do dare!~ Hehe~" Junior chuckles and shoved his length inside, making Ludwig's eyes widened and gave out a cry as the young Prince moans. "Fuck yeah!~"
"AAAAAAAGHH!!" Ludwig screamed as he felt Junior's huge cock inside his tight ass. This was utter torture! He should've known better than to trust Junior of all of his siblings! Although, his plan would soon get him out of there, and hopefully, Bowser would give Junior a suitable punishment.
Junior began thrusting hard into Ludwig's ass. His cheeks bouncing and jiggling all the while. While Junior was moaning in sick pleasure, Ludwig was groaning in agony. 'It will be over soon, Ludwig; just play along, and then your plan will be put into action!' He thought.
"Oh, fuck yes!~ This feels so fucking good!" Junior groaned loudly. Not giving a shit if his brother wasn't enjoying himself. Because he sure was~!
"J-Just shut the fuck up, okay!?" Ludwig complained before moaning in pain. "Fuck, this is awful…"
"What's that? It feels good?" Junior taunted. "Okay, I'll go harder!"
Ludwig widened his eyes and groaned louder as Junior sped up. "MMGH! Fuuuuuck…!" He moaned. All the while, he was gaining an erection of his own. It seems like his own body was also betraying him…
"Mmf! I'm gonna cum!" Junior moaned out. "You'd better take my cum, Luddy~!" This is it! Time for Ludwig to put his plan into action!
Ludwig saw his chance! As soon as Junior came and filled his brother up, his guard was down as he moaned with pure bliss. The eldest Koopaling groans in discomfort before kicking Junior away and quickly tying him up.
"Uaah! Wh-what the...?! When'd you...!?" Junior cried out in shock, his eyes widened as he saw the fire in his brother's eyes. Oh shit.
"So... you thought to have your way with me, did you? You cheeky little shit. I should've known!" Ludwig growled, he really should have guessed that Junior would have an ulterior motive. Why else would he tag along?
"Uh... ehehe... n-no hard feelings, bro?" Junior nervously chuckles, he then felt some claws spreading his cheeks and gulps, seeing Ludwig's erection. Not even caring if some of Junior's cum was leaking out of his abused hole.
"My turn~ After all... this is MY vacation, Junior. I should get some relief as well." Ludwig said in a sickingly sweet tone, grinning with malicious intent.
"W-Wait! I'm sorry, okay?" Junior panicked. Despite doing it to him, he had never taken it like THAT!

"Sorry won't cut it. Consider this your long-awaited karma~ Heh!" He said before slamming into Junior's tight ass. "Mmf! Damn, you're tight!"
"N-Nnngh!" Junior groaned in discomfort. "P-Please, don't do this!"
Ludwig didn't listen and began thrusting hard into Junior's ass. The two of them moaning and groaning loudly the whole time. This time, Ludwig in pleasure, and Junior in pain. Oh yeah, this was certainly a fitting payback!
Junior shrieked loudly as Ludwig's cock his his prostate a couple of times. This was torture! He wished desperately that he never brought up the island to Ludwig! Then his asshole could remain un-abused…
Ludwig couldn't help himself and slapped Junior's ass. "AH!" Junior gasped. "Stop it! D-Don't do that!"
"You mean… THIS!?" Asked Ludwig before slapping it again. This time, leaving a bright red handprint on his asscheek. "And why would I stop? After all, you were the one who brought me here~"
Junior mentally kicked himself. Honestly, he was right. Junior felt so damn stupid for bringing Ludwig here with such intentions… "Okay, I get it! I'm in the wrong! Just please, STOP!!" He begged. Wishing and praying to God or whoever else above that this would be over soon.
Ludwig replied by spanking Junior's bubbly ass again. "I hope you're ready for my cum, Junior~!"
'Oh, fuck! Why me…!?' Junior thought before, after thrusting roughly a few more times, Ludwig came deep inside of him. The two screaming and howling as they both blew their individual loads.
Junior felt himself getting filled, feeling Ludwig's warm cum inside of him and bloating his stomach a bit. The elder Koopaling pulled out and watches as Junior's gaping hole was leaking his cum.
"How does it feel, Junior? Does my cum feel wonderful?~" Ludwig teased him, knowing full well what his brother's actually feeling right now. What he heard next, made his stomach drop. "I'm still a bit pent up..."
"H-huh...?" Junior's eyes widened in horror. There was no way he was still hard! Sure enough, Ludwig's erection didn't soften at all. Ludwig put his brother on his knees and shoved his cock inside his mouth. "Hghgh!"
Ludwig was showing no mercy for the stunt that the young Prince pulled. This was HIS moment! He held Junior's head in place and began face fucking him, hearing the whimpers and gurgles.
"Mmmm... you know what? You're right. This does feel good~ Perhaps you had the right idea after all." Ludwig mocked him as he used him to his heart's content. Meanwhile, Junior was kicking himself for getting stuck in this situation.
'Junior, you fucking idiot! You thought this was a good idea?! Maybe if he gets this out of his system, it'll be over!' He thought to himself, squeezing his eyes shut and groans.
Ludwig just kept facefucking Junior. Feeling waves of pleasure compared to Junior's waves or agony. "Mmn! I guess your mouth is better than just talking shit~" He teased. Knowing good and well that his brother couldn't do a single thing about it.
'Why? Why did I do it??' Junior complained in his mind. He should've known better than to mess with someone older than him! No matter how big and… Incredible they were~
Hold up, what the fuck was he thinking!? This was awful…ly good- NO! No it wasn't! He was in pain! So much pain! …Or was it pleasure? Wait, what was he thinking~? It was getting harder to deny it, Junior's mind was slowly becoming warped with no way of returning.
"I'm cumming Junior!" Ludwig groaned.
‘Yes~ Cum for me, Ludwig!~ I need your cum!' Thought Junior as he squeezed his eyes shut. Bracing himself for Ludwig's incoming orgasm as his eyes slowly turned into hearts.
With a few more harsh thrusts, Ludwig came down Junior's throat. "Mmmgh! Fucking take my cum, Junior!" He shouted.
Junior happily gulped down Ludwig's cum. His eyes finally turning into hearts. The pressure was so much, Junior's stomach bloated even more. When it was all over, Ludwig pulled away and sighed. "Haaah… How was that, Junior?" He asked.
Junior was panting and catching his breath, tasting his brother's cum inside his bloated belly. He opens his eyes, showing hearts in his pupils, staring at Ludwig with lust and need.
"G-good..." He panted out, much to Ludwig's amusement, seeing the tables have turned.
"Pardon? Couldn't hear you." He said, pretending that he hadn't heard his now slutty brother's words.
"I-it felt good! It felt really good, okay!? I-I want more..." The Koopa Prince said and lapped up some leftover cum on Ludwig's penis.
"Do you now? I think we can both benefit from this, dear brother~" Ludwig says and grins, seeing Junior focusing on him as he stopped for a moment. "You'll get to be my personal fucktoy. However, if you tell King Father or anyone else... I might not fuck you anymore and this will be it."
Junior's eyes widened in horror at that.
'N-no... cock...? N-no yummy cum from Luddy?! N-no! I want it!' His thoughts were all jumbled. He couldn't let that happen! So he agrees, nodding his head quickly.
"I won't tell anyone! I promise! Please, please, please...!" Junior begged, as Ludwig couldn't help but laugh. To think, if Junior had his way, that would be him. He unties the vines and frees him, helping him up.
"Shh. There, there, Junior. You'll get more back home. You haven't cum yet. Let me help~" Ludwig whispers to him, sending shivers down the young Prince's spine. He felt a claw wrapped around his length and feels hjm moving it.
"A-ahh... L-Lud-mmgh... mmhhh~" He was cut short when Ludwig pulled Junior into a kiss, tongue and all. Whatever sane thought the young Koopa had, was long gone by now. He moans into the kiss and lets his brother do whatever he wants.
[…]
Time had passed since the incident on Walaborne Bay. As he promised, Junior didn't tell Bowser nor any other of his siblings what had happened. Ludwig kept his end of the bargain and gave him all the sex and cum he could ever dream of~
Hell, they even tried out a few fetishes during their lovemaking sessions; you name it, they've done it! All of which Junior was more than happy to try out~ At the end of each session, Junior got what he wanted… And what he deserved, at that.
As for Ludwig? He felt like this little sexual vacation was just what he needed~ And he had a sneaking suspicion that Junior felt the exact same way~
END