Luigi looks around the castle fearfully as he's being led toward Bowser's throne. Snifit roughly pulls Luigi over in front of them, causing him to fall.

"We found him in the Dark Lands.", Snifit said. Bowser gazes down at the human and growls.

Luigi looks up and yelps at the sight of him. Bowser gets up and starts walking down the stairs, not knowing Y/N is watching them from behind Bowser's statue of himself.

"Leave him to me.", Bowser said. Kamek undoes Luigi's restraints and forces him to Bowser as he floats before him.

"What is your name?", Bowser asked, spinning him for a bit. "Uh... Luigi.", Luigi shuddered.

"Not sure if you know who I am, but I'm about to marry a princess and rule the world.", Bowser said, looking at his claws before clashing them together, creating a spark. He places a nail under Luigi's chin, who chuckles nervously.

"Wow, uh... Yay...", Luigi said nervously. "But there's one problem, Luigi...", Bowser said.

Bowser adjusts his cap. "... two humans are traveling with my fiancée. One has a mustache, just like you, and has the same hat as yours. Do you know them...?", Bowser said, playing with his mustache.

"No! No!", Luigi shouted out, shaking his head. "Ah, tough one, I see. Maybe THIS will get you to talk!", Bowser said.

He pulls on a strand of Luigi's mustache. Luigi lets out a sharp gasp, panting.

"Do you think I know every human being with a mustache wearing an identical outfit with a hat with the letter of their first name on it?! Uh, because I don't.", Luigi told him. Glaring, Bowser pulls out the hair, causing him to shriek, until he grabs Luigi and tugs on his whole mustache, making Y/N gasp.

"DO YOU KNOW THEM?!", Bowser demanded. Y/N grabs the handle of her sword, ready to face him.

"Gah! STOP! STOP! STOP, STOP, STOP! I know them! Yes, I know them! Yeah, they're my siblings, Mario and Y/N, and they're the best people in the world!", Luigi said and started crying. "Do princesses find this Mario attractive?!", Bowser asked.

"THEY DO IF THEY HAVE GOOD TASTE!!", Luigi yelled out in pain, which surprised Y/N at the roasts he gave him and respected him. Bowser furiously yanks a chunk of Luigi's mustache, causing him to shriek in agony and for Y/n to snap.

"HEY!!", Y/N yelled out angrily. Luigi's screaming stopped immediately, as his eyes widened in horror to hear his sister, while Bowser looked over in surprise to see Y/N, as she approached them from the shadows with a determined glare.

"Why don't you pick on somebody your size, your Royal Fatness?", Y/N continued. Bowser growls and approaches her face with Luigi in his grasp as he breathes smoke from his snout.

"What did you call me?!", Bowser exclaimed. Y/N holds her ground and approaches his face with her glare still on.

"You heard me.", Y/N smirked. Luigi watches side to side anxiously on what's going to happen.

Bowser looked at Y/N and scoffed at her. "What's a little human like you going to do?", Bowser mocked, only for Y/n to glare harder.

Without realizing it, the girl's wing came out and spread behind her, shocking everyone in the room. "The legendary butterfly...", Kamek whispered in awe.

Bowser looked at the girl in shock while Y/N held her expression. "How about you let my brother go, turtle.", Y/N snarked, causing Bowser's eyes to widen in a fury.

"You little- right!", Bowser roared, throwing Luigi to the other side of the room. He lifted his claws to strike Y/N, but she drew her sword and blocked him above her head.

The two glared at each other before he scoffed. "What now, human?", Bowser said, pushing Y/N back.

He expected her to fall but was surprised to see her in a ready position. "I'm comin' straight on for you...", Y/N sang, as she lunged forward.

Bowser quickly deflected the advances and was backed up into his throne. "I made up my mind...", Y/N sang, as she jumped onto the throne.

"Taking a little break?", Y/N mocked as she slammed her sword on the throne's edge. "I'm feeling strong now. Now, I'm comin' through...", Y/N sang.

"Need any help, sire?", the Shy Guys asked, causing Bowser to look at them weirdly. "No!", Bowser said, reaching for a long metal staff to fight with.

"Straight on! Straight on for you!", Y/N vocalized as the two fought, going around the throne and into the main area. "Straight on for you-!", Y/N sang.

As Bowser and Y/N were fighting with each other, Luigi, Kamek, the Shy Guys, and Snifit watched anxiously. After almost an hour of fighting, Bowser manages to knock her away with his staff, causing her to fall to the ground with her cap flying out of her head along with the hair tie she was wearing the whole time to keep her hair still.

"Y/N!", Luigi cried worriedly. Y/N gets up, easing her chest from the pain as her head is down.

Bowser glares down at her, holding his staff by his side, with a triumphant smirk. "Ha!! Do you think you can defeat me? I'm stronger than you think. You're nothing but a weakling, you...", Bowser said mockingly.

In that moment, Y/N flips her hair to reveal a beautiful woman with (F/C) eyes that shine like pearls, her wings accenting the color. Bowser suddenly gets frozen on the spot by her beauty as she sways her hair.

"uuuuuuuuu....", Bowser continued. Luigi and others need clarification on what is going on with Bowser as they look on.

Y/N manages to fix her hair, as she moves it to the side for her to see while flipping it back. But, it makes Bowser even more amazed.

As he swears, he sees bubbles, hearts, and sparkles in the background. Y/N notices him staring, making her confused and creeped out.

She looks at Luigi and Kamek for any explanation, which she receives as a shrug. "uuuuuuu...", Bowser stuttered.

They were surprised at how long he could hold that word until Y/N got fed up with it and charged him, kicking him in the chin, which snapped him out of his trance. Bowser backs up a bit before he straightens himself out.

Bowser and Y/N charged at each other with a battle cry and crossed their weapons together. Y/N blows a strand of her hair out of her eye and glares at him.

"Had enough?", Y/N asked. Bowser copies her by blowing off his spiky red hair and smirks.

"I can do this all day.", Bowser replied. He pushes her off and attempts to strike her when she blocks it with her sword.

"But now, tell me where your other brother is!", Bowser demanded. "Ah, the big mighty King Bowser wants to meet my dear brother.", Y/N cooed, mocking the giant Koopa.

"I don't want to meet him! I want to capture and eradicate him!", Bowser yelled out. "Well, eradicate this!", Y/N smirked, as she was about to punch him when a ray of light escaped from her hand. Nearly hitting where Kamek and the Koopa Troopas are as they fly.

"Huh? That's new." Y/N said as she looked at her hand before she and Bowser went back to fighting, as their blades combined. "Ask him. He'll appreciate it.", Kamek said to the Koopa Troopas once they picked themselves up. 

"Okay.", Koopa Troopa noted, as they looked at Bowser. "Need any help?", Koopa Troopa asked.

Bowser roared at them, scaring them. "NO!", Bowser yelled out, before returning to battling with Y/N.

The Koopa King managed to lock the two weapons together and smirked, as Y/N struggled to free hers. "Look at you...", Bowser mocked, causing Y/N to scowl, before she swung their guns around.

Her sword was flung in the air, which gave her time to punch Bowser in the face and back away enough to catch the hilt of her sword. "Not bad.", Bowser said as he rubbed his jaw.

Y/N points her blade up to his chin. Kamek chimes in between them.

"Looks like you need help?", Kamek asked. "NO!!", Bowser said, hitting the sword away with his staff.

The two spun around for a second, and it stopped to show Bowser laughing, as he blocked her sword, aiming for his head. They turned again, and Y/N laughed, as she blocked his staff behind her with her sword instead.

With another spin, Y/N blocked his attack again with her knee bent down from behind again, and she turned and smirked at him. "Ha, ha, ha! So, is that all you've got?", Y/N asked, panting a little.

"Now, I know how to play my hand...", Bowser started to sing, as he twirls his staff. Y/N was surprised at how well the guy could sing, before blocking a strike.

"Oh, I'm ready for ya.", Y/N said, holding up her sword, as her blade gleamed for a bit. Bowser did the same, as his metal staff flashed, too.

"What the winner doesn't know, the gambler understands...", Bowser sang, confusing Y/N. "What does that even mean?", Y/N asked, before charging at him.

"No, you don't stand a chance...", Y/N sang. "You don't stand a chance...", Bowser said, as he charged Y/N.

The two meet in the middle. "I'm comin' straight on for you!", Y/N sang, as she got in Bowser's face.

"Ooh!", Bowser cooed with a smirk. "Ah!", Y/N said, as she pushed herself back.

"You fight well.", Bowser complimented as he threw another strike. "For a human.", Bowser mocked.

"Wish I could say...", Y/N said with a grunt. "The same for you!", Y/N continued.

"What do you mean?", Bowser asked, confused. "I don't know.", Y/N said, as she looked at her nails blocking the strikes with her sword.

"I was expecting...", Y/N started before she spun around and gave the king a sassy smirk."...More.", Y/N continued.

Catching Bowser off-guard and causing the spectators to laugh, they cover their mouths after seeing his glare. Bowser and Y/N then get back to fighting.

"Straight on for you...", Y/N sang. "Straight on for you...", Bowser sang.

"Straight on for you!", Y/N and Bowser sang in a duet. "Straight on for you!", Y/N and Bowser continued.

As they finished their song, they tried to hit each other with their weapon, but their arms were tired as they were. They stopped and panted, standing across from each other and trying to catch their breath.

With some strength left, Y/N lifted her sword and pointed it at his chest. "Go ahead. Kill me, but you won't get your brother.", Bowser panted, smirking.

With a tired sigh, she placed her sword on the ground, still holding it, knowing he was right. "Need any help?", Koopa Troopa asked again.

"...NO!", Bowser and Y/N groaned in unison.

DING!

They looked down to see it was Y/N's spiked ring, which had dropped to the ground during their fight and rolled toward Bowser. Y/N was about to pick it up when he took it before her quickly.

He stares at it, and his eyes widen in recognition. "Where did you get this?", Bowser asked, his voice filled with hope.

Y/N looked at him warily. "Um, my friend gave it to me.", Y/N replied.

Bowser looked at Y/N closely before he gasped in shock, his staff clattering against the ground. "N/N?!", Bowser exclaimed, shocking Y/N and Luigi.

"How do you know that name?", Y/N asked while Bowser stepped forward. "It's me. It's B.", Bowser said with a small smile.

Y/N looked at him in confusion before recognition flashed over her face. "B!?", Y/N asked in shock, which received a nod from Bowser.

A large, toothy smile made it onto Y/N's face as she became excited. "Whoa!", Y/N said as she ran towards Bowser, dropping her sword.

"Whoa!!", Bowser said as he came up to hug the human girl. The two hugged each other as if their lives depended on it, with Luigi watching in the background, shocked, while Kamek was unreadable.

"How did you...?", Y/N asked as she looked at Bowser in disbelief. "But how did you...?", Bowser asked, words failing him as he looked over his long-lost friend while Luigi was confused.

"Who...? Wow!", Bowser continued. "How did you get here?", Y/N asked.

"This is gr... ", Bowser said before he growled in joy and lifted Y/n off the ground, causing the girl to squeal. "It's great to see ya!", Bowser said with a laugh.

"It's great to see you!", Y/N said as she laughed, not noticing her brother coming toward the two of them. "Hey, what's goin' on here?", Luigi asked.

"What are you doing here?", Bowser asked, putting Y/N down but still holding her. "What do you mean what am I doing here? What are you doing here?", Y/N asked.

But, Luigi had shoved his way between the two, before he could answer... a hand on either abdomen. "Hey! What's goin' on here?!", Luigi asked/shouted.

They snapped out of their excitement and looked down at Luigi. "Luigi, this is B. He's been my best friend since we were kids.", Y/N said with a smile.

"Friend?!", Luigi asked, before looking at Bowser, before cowering again. "Him? Y/N?", Luigi asked, hiding behind his taller sister.

"Yes, him, he saved my life...", Y/N said, as the two started to talk to each other. As the two talked, Kamek approached Bowser, who had yet to take his eyes off the h/c haired girl.

"So, that's the girl you told me about?", Kamek asked once he was beside Bowser. "Yep!", Bowser replied as if he were a zombie.

"She's quite the looker.", Kamek spoke, looking at Bowser, who had an even more dopey smile. "Yea-WHOA!!", Bowser exclaimed in shock, as he turned to face Kamek.

Putting a clawed finger to his lip, he pushed the wizard, who looked at him with an arched brow. "Not too loud. She'll hear you.", Bowser warned.

Kamek was about to retort, but someone clearing their throat got their attention. Turning, they saw Y/N looking at them with a smile.

"Hi, sorry to bother you, B and...", Y/N said, pausing, as she didn't know the magician's name. "Call me Kamek, dear.", Kamek said with a smile.

"Right! Anyway, it was great to see you again and to meet you, Kamek. But my brother and I must be going.", Y/N said, as she sheathed her sword and grabbed her brother. She was about to leave if the Shy Guys hadn't snatched her brother right out of her arms.

"Wha-Hey!", Y/N yelled out, only to be held back by a scaled arm. Looking up, Y/n was shocked to see a severe expression on Bowser's.

"I'm sorry, Y/N. But this is my kingdom. And as king, I have to uphold the rules and standards of this nation. Due to our history, I'll drop the trespassing charges for you. But for your brother, he must pay.", Bowser said, before looking at the Shy Guys and nodding. Luigi yelped, as the Shy Guys started pulling him towards the cage hanging by the chains, as it lowered for him.

"W-What are you going to do with him?", Y/N asked, looking worried. "Where all the prisoners belong. Hanging above the lava.", Bowser said.

Y/N gasped, her eyes wide, as she saw the cage get locked. The Shy Guys moved a small lever, which forced the cage over the pit, before moving towards a more over-sized lever.

"Wait!", Y/N cried out just as they were about to drop the lever. "Take me instead, my freedom for my brothers.", Y/N said, looking at Bowser straight in the eye.

"Y/N!! No!!!", Luigi cried out, his hands against the bars, as he looked at the giant Koopa and his sister. "You would... take his place?", Bowser asked, looking at Y/N in the eyes.

"Of course, he's my brother.", Y/N said, her eyes holding desperation. Bowser looked at her for a few minutes, before sighing.

"Fine.", Bowser said, nodding to the Shy Guys, who moved away from the large lever to move Luigi's cage. When the cell was placed on the ground and unlocked the door, Luigi sprung out and ran towards his sister.

Y/N escaped Bowser's grasp, before kneeling to hug Luigi. "Sis, what are you doing?", Luigi asked.

"Making sure you're okay.", Y/N said, before she bumped her forehead with her green-themed brother. "Go find Mario, tell him I'm fine, and I'll try and meet up with you soon.", Y/N said, as she pulled away.

Before he could speak, the Shy Guys pulled him away from Y/N and started heading out of the castle. "No! Wait! Y/N! Y/N!!", Luigi screamed, reaching out for her.

Y/N sadly turned away from him as soon as Bowser came close to her again and grasped her in his arms. He looks at Luigi blankly with a hint of dark glare.

"You will never see her again. Be grateful that I'm letting you go alive.", Bowser said. Luigi watches in horror and sadness, as he looks at his sister one last time, before the doors close in on him, blocking him out of his sight.

Y/N hopes Luigi finds Mario sooner than Bowser. Bowser smiles down at her.

"You must be tired from all that... fighting we have. Why don't you get some rest?", Bowser suggested. "Well, I am a little tired.", Y/N said, yawning a bit.

Bowser happily carries her and walks towards the chambers. After all these years, he's finally reunited with her and he won't let her go ever again, ever.