Sirena Beach
Mario wiped his brow of sweat after collecting the next Shine Sprite of the area, he had just finished cleaning the beach and terraces that were covered in the electric goop; with his duty done for a moment of cleaning the area, Mario looked around for Bowser Junior to see where he went off too, only to witness a mech of sorts surf along the ocean before turning towards the beach while causing a shift in the ocean in the form of mini waves from its sudden jerk of turning so quickly.
As the mech surfed towards the beach, Mario could make out its more defining looks as it looked like a blue armored turtle shell with flapping flippers that spun at a high rotation; Once the turtle shell-like mech reached enough distance to the beach, the flippers ceased before retracting into the shell and allowed the mech to rely on its momentum to breach along the shore of the nearby hotel.
Once the armored shell breach along the shore, Mario took caution as he headed towards the beach, ready for any ill intent from the driver of the mech; meanwhile from the mech, the shell made noises of hatches being unclasped before letting out a hiss from the mechanics within it as the shell opened up. Inside the cockpit of the shell was Bowser Junior with an excited toothy grin as he waved down at Mario.
Now noticing the disparity of how big the mech turtle shell was, Mario took in an observation that the mech was big enough for two riders and then some. "Junior?" Mario questioned the young tike of Bowser as he approached the large turtle shell mech, "What's-a deal with this-a mech?" he asked while FLUDD on his back turned her nozzle to express her thoughts as well as she spoke from her nozzle.
"This wouldn't perhaps be another design of yours to incorporate me into your mech, would it?" FLUDD asked with some trepidation.
Bowser Junior stood up and placed his fists on his hips as he proudly puffed his chest out, "Glad you two asked, I present to you-" He then gestured out with a sweeping move of her arms and hands to the mech he was standing in, "The Carracosta mech Mark 1!" he announced with pride, and gestured for Mario to hop in while a ladder folded out from the cockpit for Mario to use to climb up into the large mech. "Let me show you the details for the next boss fight against the Koopalings!"
Mario glanced behind him and shrugged to FLUDD, before looking back to climb into the cockpit with Junior; Once Mario was within the cockpit, Bowser Junior walked around while showing there was enough wiggle room for both him and Mario to walk around within the cockpit of the Turtle shell mech, "As you can see, I've learned from the past mechs and incorporated fails safes to help aid and happenstance of potential failures within the design of the mech, I even installed-" Junior knelt down to show Mario levers on the pilot seats, "Ejector seat for incase of total failure within the mech!"
FLUDD chose the next moment to voice her concerns, "Junior, does any of this require my integration?" she asked.
Bowser stood back up to beam a wide smile at FLUDD on Mario's back, "Glad you asked!" he started to say as he walked to the back of the cockpit and show an empty slot where Mario could install Flood into, "I've also integrated a way for you to be installed into the mech and extend your artificial intelligence throughout the entire mech, and Mario-" Bowser Junior then walked back to the front seat to show very simple controls for Mario to be capable of understanding, "Will be able to control the mech with you and use the nigh-infinite water rockets it is capable of firing off."
"Infinite water rockets?" FLUDD questioned Bowser Junior with a tone of robotic skepticism, "Am I to assume the mech requires to be in the water the whole time to fully use this type of advantage?" she questioned the little tyke.
Junior giggled a bit before shaking his head, and walked over to show meters of water reserves, "Not the whole time, the mech is capable of limited flight from the use of your water rocket boost tech for evasive maneuvers, so Mario will have to keep in mind that he'll need to land back into the ocean to recover his reserves of water."
"Hmm." Mario nodded in understand as he walked around to view more of the cockpit, "So, which-a koopalings are you-a expecting Junior?" he asked as he looked around the inside of the mech.
Bowser Junior shrugged with a confused look, "Not sure, it could be any one of them, or in pairs…my coins are in pairs though." he answered while scratching his chin in thought with his index claw.
"What makes you say that?" FLUDD asked, not sure why Junior was banking on them facing against two at once.
As if to answer FLUDD's question, the ocean began to heave upwards until a twin headed dragon mech rose from out of the surface of the heaved ocean; as the water fell off from the twin headed mech, its appearance was more prominent. The twin headed mech was of a two headed dragon mech that had blue snouts, white hair running down the back of its heads and necks, a yellow body and tail that occasionally swung through the ocean.
Twin headed Dragon Mech
Gleeok
"Junior!" A gruff tone of voice echoed out from the right head as it lowered down to look directly at the lone mech on the beach with Junior and Mario inside the opened cockpit, "What do you think you are doing!?" The familiar voice of Morton rang out through the air.
"Kyahaha! I think it's hilarious the little kid is having a little spat with his dad!" Wendy's voice rang out from the left head as it lowered down to turn its head at the right head, "I think it's adorable he can match his dad with Mario."
Junior simply looked up at the twin heads that were piloted by Wendy and Morton, and gave them a deadpan stare, "You do know Mario's kicked your butts plenty of times before, right?" he inquired of the two Koopalings, while earning an amused nod from Mario.
"Shut up!/Who asked you?" Both Morton and Wendy angrily yelled out from their mech heads, before controlling them to lift their heads up to roar out flames of fire into the air, "Prepare yourself to be beaten by my mighty mech, Mario and junior!" Wendy spoke first, before Morty's head nipped at Wendy's head.
"Your's? We're both piloting the mech, you insufferable Koopaling!" Morty spouted out, before the two began getting into an argument.
While the two koopalings were preoccupied in their argument against each other, Bowser Junior quickly ushered Mario to get ready while the shell hatch closed, and its engine ignited to life.