"Take this!" Blanc charged in swung her hammer/axe at the man.

"Hmmp!" he managed to block the blow, but he was greatly pushed back. This time, he could feel impact of the blow lingering as his arm still kept vibrating. "Not bad. I actually felt that."

"You are just bluffing!"

As soon as Blanc finished speaking, Noire and Neptune attacked from sides. He quickly positioned his arms to block their attacks.

*Clank*

"Grrrgh!" He was obviously groaning as he was blocking their swords with his gauntlets.

"Hah! Where is all your bluff now? You can't even smirk, huh?" Noire decided to taunt back for revenge.

"You can't act tough now. Your face doesn't lie," Neptune said calmly.

"Don't get cocky, you bitches!" he shouted out loud and stomped the ground hard enough to crack and send shockwave, pushing both of them off of him.

"Tch!"

"Not bad for muscle head."

"Haaaa!" Vert charged right at his back from above. However, his instinct turned him around and moved both of his arms to block her attack.

*Clang!*

With sound of metal clashing, ground beneath him cracked again. The fissure extended all the way to where Katakuri and others stood. They could feel air pressure from their clash.

"Uwaaa!"

"What enormous strength!"

"Is this how much stronger they become after they transform?"

While the spectators were simply dumbstruck, Blanc dashed from behind as soon as Vert clashed with the man.

"I doubt you can block this!" Blanc yelled as she prepared to swing her weapon again.

But her eyes twitched as she saw him moving his leg just in time like reacting to her. She was astonished by his quick reflex. When she swung, he barely managed to block the attack.

*Clank*

"Lucky guess. But that won't get you far!" Blanc kept pushing his leg. Ultimately, he was tripped. Vert didn't hesitate thrusting her spear. In fact, she thrusted her spear at him multiple times. While falling, he kept blocking her attack.

"Kuk!" he groaned as his back of his head hit the ground. Despite shock, he moved his gauntlet to block her onslaught again and again.

Finally, he spotted opening. He deflected her spear to side, so she would move closer to him for counter. However, this was not the same Vert. After tasting his counter attack, she used her spear as a rod like a pole jumper jumps. She flipped forward and avoided his counter.

"You can't hit me same way twice," Vert grinned while passing the baton to others.

All four of them were in perfect harmony. It was like their minds were connected. Neptune and Noire didn't need to hear a word from Vert. They begins to smack down on him right after Vert left.

"Take this! This!" Noire ferociously slashed him with intense eyes.

"Keep this up!" Neptune took each turn with Noire to beat him. When Noire withdrew, Neptune attacked him. This pattern repeated for few seconds. Within that short time, he blocked and deflected hundred attacks. His troubled look and sweat clearly showed that he was in big trouble. Eventually, his gauntlets started cracking.

*Crack* *Crack*

"Blanc, now!" Both of them fell back and shouted.

"Haaaaaaaa!" She rushed from far away and jumped with light shining on her.

"Getter Ravine!"

She smacked down the enemy with great force. Unlike the last time, she controlled her might. So she wouldn't get exhausted. Moreover, she got used to transformation.

*Crack!*

*Rumble!*

Blanc shattered his gauntlets, and ground beneath him splintered. Ground fragments stood up due to sheer force from her attack.

"Kuk!" he groaned and threw out blood from his mouth.

After that blow, she leaped back and witnessed how messed up he was. His blood covered all over his body. Then, she realized that her weapon was also tainted by his blood.

"Not so tough, are you? Where is all the smirk before?" Blanc looked down on him and taunted him.

"It's over. Just surrender, so you may get less punishment," Neptune stared and pointed her blade at him.

"Ugh… n-not… yet…" he struggled to get up. He did get up, but his trembling legs clearly indicated that he was almost done for. "Y-you don't k-know… w-w-what's like… to lose…"

"Maybe, but we almost had that," Vert also raised her spear and pointed it at him. "You harmed my sisters and tried to jeopardize our party. There is no getting away from this."

"Hah! Getting away? D-don't make me laugh! I am not done yet!"

"Yes, you are. Just look at yourself. Bloody and bruised," Noire smirked with arms crossed. "Just give up, so you may be given mercy."

"Shut up! Aaaaaaaaaaaa!" he charged at them like a mad bull. His bloody eyes were fixated on them. He did roundhouse kick at Neptune.

"Not so fast!" Neptune blocked the kick.

*Crack*

His shin guard shattered like glass.

"Cross Combination. Then, followed by Kinestra Slash and Tornado Sword," Katakuri said while calmly observing the fight.

"Are they skills that our ladies developed? A henchman next to him asked.

"Yes, you will see. And he will smashed into the wall."

"H-how can this…" before he could finish his line.

"Cross Combination!"

*Slash* *Slash* *Slash*

*Slam*

Neptune started slashing him. After sending him up high, she jumped and slammed him to the ground. That was her first skill that she unlocked.

"Ugh!" While falling to the ground, he noticed another killing intent.

"Kinestra Slash!"

It was one of new moves Vert unlocked after rigorous training. She dashed and attacked several times in blink of eyes.

*Tututututu*

"Aaaaaaargh!" He screamed again before he could hit the ground. He was momentarily frozen in the air due to impacts of the attack.

"Tornado Sword!"

*Slash*

Noire tagged in as soon as Vert finished her attack. There wasn't even hint of hiccup. That was perfectly synched teamwork without giving the enemy time to take break.

"Ku….!"

*Thud*

He was sent all the way and smashed against the wall. He was totally stuck there unconsciously. It was over.

"Yeeeaaah!"

"Our ladies won!"

"That's what you get for messing with Big Mom Pirates!"

"He was all bark. Nothing else."

"Finally… after all these years, I get to witness their beautiful and elegant transformation…"

After the fight, there was lots of noise. From praise of the four sisters to mockery of the fallen enemy. They looked at each other to confirm the success.

"Guys… you have symbols on your eyes… do I have them on my eyes as well?" Neptune looked around and asked.

"Yes, it looks like we have the symbols on our eyes. This means we finally unlocked our power! Mama will be proud of us," Vert clapped and smiled.

"Transformation makes us several times stronger and faster. It was the first time, but I think I got hang of it. I understand what that strange guy was talking about," Noire supported her chin with her hand and nodded.

"Is it just me or do I feel Neptune is the only one with most drastic change among us?" Blanc pointed at Neptune and asked.

"Don't ask me. I am just as confused as you are. This is my first time on this form."

"Your voice changed… so did your bust…"

"*Sigh* didn't you vent enough of your anger on him? How many times do I have to tell you not to fixate on chest size?" Vert deeply exhaled and patted Blanc on her shoulder.

"I mean with Neptune like that… I am the only one with flat chest… totally unfair."

"Vert is right. You are the only one who focuses too much on chest size. Give it a rest," Noire shook head and sighed.

"My normal form will still have flat chest, so don't worry, Blanc."

"Fantastic work," Katakuri walked toward them. "I knew you guys would pull it off."

"It wasn't much," Noire flipped her hair with eyes closed. "He was no match for our combined might."

"Let's be honest. That was after we transformed. It was other way around before that," Blanc glanced at Noire and said.

"What matter is that all of us finally transformed and defeated him together," Vert grinned and snapped her fingers.

"Thank for trusting us, brother," Neptune approached and leaned on Katakuri.

Then, he gently stroked her head.

"Hey, no fair! I want to be patted by brother, too!" Noire rushed in and hugged his other side.

"Oh dear! I will join."

"Like hell I am going to be left behind!"

Vert and Blanc also joined in. He took turn to pat each girl in order to show equal love on all of them. Brother/sister love scene instantly brought smile to everyone around them.

"Aw~ they look so lovely."

"Lord Katakuri is cool, awesome, yet caring and gentle."

"Not to mention those four look so good together."

As the four sisters hugged him while floating around his upper body, he hugged them back for a moment. Then, he released them.

"Alright, there shouldn't be any guest remaining here. Let's go back and deliver this great news," he pointed back at the gate with his thumb. "Guys! Shackle and bring that man to the party. He will be proof of our sisters' power."

"Right away, sir!" chess soldiers answered and ran to the fallen enemy. Next, they picked him up and wrapped him with metal chains. He was transported to the party. All that was waiting for him was humiliation and dreadful punishment.

"It looks like you guys gain ability to fly after transformation," he looked at the girls and commented.

"You are right. We were so focused that we forgot we were even flying," Noire looked at her feet and then others to confirm that.

"Can you guys stay in this form longer?"

"I am not sure, brother… Blanc?"

"Well… the last time I smashed the biscuit soldier, I used all my strength carelessly. But this time, I trusted you guys, so I didn't have to spend all my power on that guy," Blanc put her hand on her chest.

"Anyway, let's go and meet mama before we revert to our normal form," Vert wrapped her arms around other three girls and grinned.

All four girls followed behind Katakuri.

"That was splendid, ladies. I am sure mama will be very happy. Anyway, come on in," door Homie opened itself.


Party Hall

"Perorin Oh, it's Katakuri… and who are those flying girls behind you?" Perospero asked while licking his own candy stick.

"These are Neptune, Noire, Blanc and Vert," Katakuri answered right away.

"Oh my! Does this mean!?"

"Yes, they can transform now."

"What a coincidence! Unlocking transformation in party day? I can't wait to see huge smile on mama. Kukuku."

"Brother Perospero, how do I look?" Noire winked at Perospero.

"Beautiful. That's all I can think of. You girls better go to mama. This is the perfect chance."

"Oh, we defeated an intruder together. He is there, being carried by chess soldiers," Neptune pointed at the soldiers and the guy.

"Really? I guess we can use another soul for Homie."

"Perhaps, mama will grant us our own Homies to accompany, right?" Vert asked.

"I am definitely sure she will. Transformation and getting score like this… what more mama could ask? Perorin~"

"Just watch us impressing mama. Today will be history," Blanc clenched fist and sniffed.

"Let's hurry. We don't know when we will revert back to our normal form," Noire gestured her hand toward herself, telling others to come.

So they all flew to Big Mom while the chess soldiers were busy trying to catch up to them. Big Mom was having conversation with guests and munching cake pieces.

"Mama, we are here!" Vert shouted and waved her hand at Big Mom.

Big Mom stopped eating and looked at source of the voice.

"Who?" Big Mom asked with confused look.

"It's me, Vert!"

"Really? That means…" Big Mom looked at other three girls.

"Yes, this is Neptune."

"I'm Noire."

"Mama, this is Blanc."

"You girls finally unlocked power!" Big Mom instantly smiled to the point it looked like her mouth could tear up.

"Oh, you girls transformed! All of you look very beautiful!" Stussy dropped her cup and commented.

"Oh my! This is big news! Big Mom's adorable four daughters finally unlocked their power!?" Morgans the big news started spamming camera light and took multiple pictures of them with visual den den mushi.

"Oh hey, Morgans! Make sure we are shown with nice pose!" Noire took sexy pose and winked at Morgans.

Morgans' eyes quickly turned into hearts. He still continued snapping photos and taking notes.

"Oh, and mama! We also took down an intruder!" Blanc pointed at the guy after the chess soldiers arrived in time.

"We took some beating, but after we transformed, he was a sandbag for us," Neptune said as she glanced at him.

"So this bastard hurt my daughters? Well then. There should be punishment. This is perfect timing. First, I will announce to everyone that you girls can now transform. Second, this man will be given chance for roulette."

One of the chess soldiers brought a den den mushi to Big Mom. After clearing her throat, she started her announcement.

"Hello, everyone. I have great news to announce. Today… in tea party day… my daughters finally unlocked their hidden power. Behold!" Big Mom stepped aside and spread her arm to emphasize her four daughters.

"Hello, everyone! This is Vert. And these girls are Blanc, Noire and Neptune," Vert pointed herself and other girls in order. "These are our new forms."

"Heh~ so that's the transformation," Daifuku smirked from his seat far away from central stage.

"Oh dear. Our ladies have grown quite beautiful-soir," Tamago wiped off bit of tear from his eye.

The sisters sent kisses, winked and took nice pose in order to live up to their audiences' expectation.

"It looks like you girls also gained ability to fly," Big Mom said as she stroked each girl's head.

"Yes, are you proud of us, mama?" Blanc asked.

"Of course… actually, I can't be any happier! I already tasted your work. They all taste great. Oh, and Noire. Your artistic sense is fantastic as well. You girls poured much passion. And finally transforming on top of that? You finally accomplished both goals."

"So does that mean we will get Homies to accompany us?" Vert put her finger on her lips.

"Definitely. Besides people from Trump Island, we have the intruder. Speaking of him, let's get into the next stage. Soldiers. Bring the roulette!"

"Yes, ma'am!" The chess soldiers ran to retrieve roulette.

"And I have another announcement. Today, my daughters defeated an intruder who was bold enough to ruin the tea party."

"Mama, don't forget to mention that he hurt us badly. We actually bled!" Neptune whispered.

"Do you seriously have to mention that? Wouldn't that ruin the whole mood?" Noire tapped Neptune on the shoulder.

"It's better to be honest. It will emphasize our struggle. And it will show a good reason to punish this guy."

"Neptune is right, Noire. We have to be honest to hype up the mood," Big Mom briefly backed off from mike and whispered them.

"Grrrr…. Big…Mom…" the man barely managed to stay conscious through his determination.

"Although they took quite beating initially, they easily subdued their opponent with their new power! For crime of hurting my daughters, this man will be given chance to choose punishment. Do you know what that means?"

"Roulette!" many party attenders shouted at the same time.

"Right. Speaking of that, here comes the roulette!" Big Mom spread her arm toward the chess soldiers carrying the roulette.

"Hah… bring whatever punishment you bring… I won't… even flinch…" he coughed up blood and intensely stared at Big Mom.

After the chess soldiers set up the roulette near him, he bit and pulled it down to rotate it with his mouth.

"What will you lose? Arms? Legs? Mamamama!"

As the roulette started slowing down, he couldn't help but gulped. Deep in down, even he had fear. Fear about Big Mom. Fear about punishment. Fear that all he has done was for naught. Various kinds of fear mixed together and caused him to start shivering.

"Oh ho! This is another big news. Dreadful roulette in midst of tea party!" Morgans continued his journalism.

"Farewell," Katakuri closed his eyes and sighed. He already saw the future.

The roulette finally stopped. What the arrow pointed at…

"Mamamama! 100 years life span!"

"That should be plenty for Homies for all of us," Vert sniffed with arms crossed.

"Tch!" the guy clicked his tongue.

"I am kinda sorry for him," Neptune looked down upon him.

"Don't be. This is what he gets for messing with our family," Noire put her hand on Neptune's shoulder.

"You asked for this, bastard!" Blanc shouted with her raging red eyes. "Prepare yourself!"

"Any last word?" Big Mom asked while staring at him up close. Her eyes changed.

"Screw you!" he yelled and spit blood on her face.

*Gasp*

Almost everyone at the party freaked out. That sealed the deal for him. Despite his valor, transparent blob started flowing from his body.

"Here comes Soul Pocus!" Morgans shouted while madly taking pictures.

Big Mom swung her arms at his soul and grabbed it out of him.

"100 years," Big Mom calmly said.

"Guaaaa!" The guy screamed as his soul was extracted from his body. Then, his empty corpse collapsed on the floor.

"Mama, we didn't anticipate soul extraction, so we didn't get to choose which objects to put soul in," Vert approached Big Mom and said.

"You can request me anytime. Just pick and bring objects for soul injection."

"So the second part is done, so can we enjoy the party now?" Blanc asked.

"Wait… I feel our introduction lacked something…" Vert took a moment to think deeply. "Oh right! These are our new forms. We didn't specify. We just introduced ourselves with our names. Shouldn't these forms be given names to differentiate from our normal forms?

Vert asked other girls to come to her for discussion.

"Good point actually… I believe our nicknames should have something in common at least…" Noire pondered.

"…Heart… how about all our codenames end in 'Heart?'" Neptune snapped her finger as she proposed her idea.

"Why?" Blanc asked.

"Because we derive our power from faith and bond of people who trust us. Faith and bond come from heart, right?"

"That's good point… 'Something' Heart…" Vert closed her eyes and went into deep thought. "How about we put colors in front of 'Heart?' Color is generally used as codename. Since my current hair color is green, I will name this form 'Green Heart.'"

"So color, huh? Hmm… I will follow Vert's idea and name my form 'Purple Heart' since my hair's color is purple now."

"So that leaves me and Blanc."

"My hair color is light blue… , but 'Light Blue Heart' … that doesn't match other two. It does sound mouthful. My hair is not full blue, so I can't call this 'Blue Heart.'"

"How about 'White Heart' because of your clothing?" Noire suggested.

"B-but, Noire! Your hair is white! Wouldn't it better for you to have 'White Heart?'" Blanc got flustered.

"Yeah, but that leaves you with awkward situation. Not perfect coloring for name. And besides, who says it must be based on color of our hair?"

"Noire is right, Blanc. You don't have to focus on hair color too much. Half of us choose based on hair color, and other half based on color of costumes. Balanced, don't you think?" Vert smiled and winked.

"If you put it that way… alright… I will take 'White Heart' … that means, Noire, you…"

"Yep, that means I am 'Black Heart' based on my costume color. I actually like that name."

"That settles. Then, let's make another announcement." Vert flied toward Big Mom, and other three girls followed her. Then, she whispered Big Mom. "Mama, we want to make another announcement."

"What is it?" Big Mom looked to side and asked.

"We came up with names for our new forms."

"Really? Then, go ahead and tell them."

"With pleasure," Vert received the mike from Big Mom, cleared her throat and started speaking. "Hello, everyone. We would like to make another announcement. We just came up with names for our new forms. First, let me introduce my form. This is 'Green Heart.'"

"It looks like she came up with nice idea. That's quite fitting name for her," Stussy commented with slight grin.

"My new form will be called 'White Heart."

"Mine is 'Black Heart.' Please look forward to me!" Noire winked and blew kiss to audience.

"And lastly, I chose name 'Purple Heart.' We chose these names based on our hair and costume colors. As for our group name…" Neptune paused. She said something that she wasn't prepare to announce.

"Crap! We forgot to come up with our group name… Neptune, why did you have bring that?" Blanc whispered.

"There is no need to be mad. We just have to come up with impromptu group name," Vert joined in.

"But what? I can't think of…" before Neptune could finish her line.

"Four Heart Sisters. How is that? Because we have the names ending in 'Heart.' There are four of us. So that makes sense, right?" Noire intervened and snapped her fingers.

"Good idea, Noire!" Neptune got back to the mike. "Ahem! S-sorry for delay, everyone. From now on, call us 'Four Heart Sisters!'"

"Ooooooh!" almost everyone in the party shouted and cheered at the same time.

"That's quite catchy name!"

"Four Heart Sisters…. I like it! kukuku," Perospero grinned while licking his candy.

"Another big news! Linlin's daughters came up with their official codenames! These will be on their bounty posters!"

"With that, another great force is added to our family-bon," Tamago commented while gently drinking from his cup.

"All hail Four Heart Sisters! Four Heart Sisters!" subordinates started praising and chanting the name.

Four Heart Sisters began to circle around the area for aerial show while winking and blowing kiss. They were charming enough to make people forget about Soul Pocus. Finally, they achieved their goal. They became fine members of Big Mom Pirates. They couldn't wait to start helping their brothers and sisters in actual battle. However, they decided to forget that for now and focus on enjoying the party with everyone.


A/N

I really spent lots of time deciding on Katakuri's action here. In manga, he showed that he won't let anyone hurt his siblings. I was wondering whether he would let the four sisters get hurt for sake of their growth. But I believe he would do that after all the training and knowing their tenacity and goal. Unlike other siblings, Neptune, Noire, Blanc and Vert really aim to be stronger in this case.

Once again, I wrote longer than the previous chapter to give bit more spot light on other One Piece characters. I tried not to make this feel bloated. It's really tough balancing.

And finally, I got my lazy ass up and made cover for this fanfic. I hope you would like it.