#Well was meant to be second dad luigi and bowuigi I guess they're not married yet XD

[givemeuniversalcrossovers]

Mario Sunshine remake/Sequel where its a canonically few years on from the last sunshine game and Bowser Jr is a bit older and a bit bigger and hears that the Mario and Princess are going back to the island on holiday and goes huh, well, I'm bigger. I think I'm gonna get that Mario.

And thus plans to kidnap Princess Peach again to try again because he's gotten bigger he's got a bigger ego big man syndrome but he's not dumb he recruits his siblings too because hey potentially fighting / messing with Mario AND warm holiday fun times. I feel like Wendy would love it like yes relaxation Sun and fun. So they go to cause mayhem, Bowser probably knows they're up to something since they all just leave but eh, they'll holler if they need help they're getting older he trusts they'll be okay, maybe sends Kamek to spy/for updates he doesn't wanna be a helicopter parent but also wants to see how well they do and be ready to leap in and help if necessary. It'll mean that each area likely has a Koopalings boss or two so fun spicing it up from last time with obviously some old bosses thrown in.

They don't realise though that Luigi got sent in advance as bait pretending to be Peach arriving early blacked out plane windows guards with umbrellas to hide the 'princess' from view ect, just in case of a repeat of last time/bowsers shows up so at least if they do cause problems the Princess can be kept out of the way as Mario arrives to fix things. So the Koopalings show up and go to the hotel demanding for the Princess' room, don't question the fact they're given her room number no problem and go and grab 'her' hastily tied up gagged and in a sack or something. Poor Luigi was probably just out/was going in the shower getting dressed/not yet undressed (no nakey weegie here) and the steam obscured the Koopas vision and so he got snagged.

And thus game begins Mario has to go save his brother who was kidnapped, recollecting suns in the process ect like a good person since the Koopalings probably screwed with them too and paint absolutely everywhere with probably color coordination/pattern coordination to each Koopa so you can guess who's in which level like pink hearts for Wendy, crazy multicolor swirls for i believe Larry or iggy whichever the hyperactive one is ect. At some point in the game there's a cutscene of the Koopalings all enjoying the steamy warm flying jacuzzi, some nursing wounds after a beat up from Mario and probably Wendy maybe Roy Roy strikes me as empathetic is like hey it kinda feels unfair to have Peach tied up in a sack in a floating cage while we enjoy the hot water, maybe we should let her out for a bit? And after some debating Jr mentioning that well she didn't want to join him and dad last time they agree cause like they all kinda like momma Peach even if they know she's not really their mom they're more here for fun than malice so it feels right to let her enjoy the warm water and drinks with them. Ludwig waves his wand and the cage floats down and they open it taking off the sack and, "LUIGI???" They're all fucking stunned cause???? The green one??? What?? Where's Peach?? How?? When?? Ludwig did you mess up your magic and swap them??? Promptly starting a major uproar argument between all the siblings over who cocked this up big time. Luigi is just eehhhehe. He's very awkward. At one point one of them is like well I mean sometimes hes there when beating dad this might stall Mario for a bit, plus we can always still get Peach later and that'll be two captives over Mario. This settles them as they murmur agreements and Ludwig magics more drinks which definitely helps ease over the mood, they're probably drinking pg safe coconuts with straws no tropical island drinks here if you get my drift they're probably not old enough to drink alcohol XD. One of them puts Luigi on the floating duck in the middle of the water so he can't escape and puts a drink in his tied hands adjusting the knots so he has enough mobility to lift it to drink from the straw.

Meanwhile Bowser? Absolutely cackling losing his shit laughing at his kids rookie mistake of not questioning the lack of resistance. He loves his kids but he is gonna laugh at the cock up. But he is proud they're doing well despite that but he's on the throne wheezing and has dented his arm rest from banging his fist down in laughing hysteria.

Another cutscene later in the game, Luigi still on the duck drinking coconut drink as Ludwig complains to him about something maybe his siblings not appreciating music as Luigi nods his head understandingly. Every so often there's a cutscene with a Koopaling just kinda talking to Luigi while he floats on his duck it's for character building and just funny imagining him just stuck duck floating around as the kids talk to him. Maybe at one point he's actually in the water floating on his back while Junior floats beside him also on his back like "I just worry ill never surpass my dad you know? Like, I'll always just be Junior. A smaller Bowser. A shadow of my father's glory." and Luigi balancing a coconut drink on his stomach is like "Hmm. I knowa what you mean." just lmao bonding floating about together, "Illa say you're definitely a lotta more scary then you were, youra growing into your own person with your owna style. Working witha your siblings very clever." and Junior scoffs and is like "It's nothing my dad's never done we've always helped him." and Luigi counters, "But, youra helping eacha other, Morton has beena here twice healed up went backa out there, Ludwig hasa boosted Wendy and Lemmy witha magic already fora rematches. Thata will be keepinga Mario on his toes. Workinga with other bosses too, tricky stuff, you have good ideas." just lmao being nice he knows what it's like to be in a shadow and he is kinda terrified and impressed by juniors game plan with the Koopalings being able to swap back recharge swap back in. Plus he doesn't know if the Koopas temper will shift so genuine compliments and peace keeping so he's not drowned.

This game definitely is probably longer and harder with the kids getting stronger and coming back for more but eventually they'll reach their limit unable to go back to fighting. In cutscenes they'll be seen sat out the water or in the water with bandages looking too tired to go back and fight. The end fight is likely with Junior at the jacuzzi his siblings tho tired lend some help making it very difficult but their attacks are infrequent and slow. Maybe Bowser shows up probably right at the end after beating junior but I don't think he'd join the end fight/be a final surprise boss, the kids did a good fight but they've lost and he doesn't think they'd want him jumping in stealing their fight so he shows up as the escape assist and they all escape to dad cause ya know a good future king knows when to retreat. And like you get Luigi back the kids noticeably waving bye to him Junior saying "I'll see you next time Luigi! And I'll get you Mario!!!" as Luigi shyly laughs cause oh no what has he started. Ends happy Peach arrives they all enjoy their holiday, though Luigi absolutely passes out at his hotel room on his bed as he's thoroughly holidayed out. Mario and Peach walk the beach together into the sunset chatting and laughing.

Cut to bowsers Castle of kamek helping heal the kids up while Bowser absolutely lovingly laughs at and bullies his kids for the hotel mix up and junior is very embarrassed before Bowser scoops him into a playful noogie saying "I couldn't be more proud of you!" and Junior just??? "but we failed to get peach??" and Bowser laughs and is like "you think /I/ succeeded the first time I tried?? It went horribly wrong and blew up in my face! You actually kidnapped someone, Mario was terrified and you all planned to raise the stakes if given the chance adapting to the situation. You did really brilliantly." just tells his kids how good of a job they did but also laughs and is like "oh the old wrong hotel room trick" wiping his eye from crying laughing. Let him lovingly rib on his kids XD bullying is a love language.