Hyperdimension Neptunia belongs to Compile Heart, Idea Factory, Sega and whomever else worked on it.
It was early morning, the sun was just starting to crack over the horizon when Gamindustri was shaken by a massive quake that had everyone falling out of bed and sitting up in shock.
"What the heck?" Blanc, Lowee's CPU groused as she sat up and rubbed her eyes. "Is the graveyard back?" The last time there was a quake this bad, it had led to all of the CPUs being captured and drained for three years after all.
"Blanc!" A familiar voice had her looking up as Neptune, in her purple dress and small hooded jacket came into the room, looking incredibly happy to see her.
"Neptune?" Blanc blinked in confusion, which only increased as Neptune suddenly dive-tackled her to the floor and hugged her tightly. "What the heck?!"
"Um, sis..." She heard Rom's voice and turned her head to see her sisters standing at the door...
...But they weren't alone...
...As there was a Neptune that was next to each of them, holding their hands.
"WHAT THE HELL IS GOING ON HERE?!" Blanc screamed in absolute shock.
When the Neptune that was hugging her suddenly kissed her on the lips, she gave up and decided that she needed more sleep as she passed out in Neptune's arms.
(-)
In Leanbox...
Vert wasn't sure if she should be happy or not. On one hand, Neptune, who was wearing a green tracksuit for some reason, had somehow slipped into her bed and was currently cuddling against her and nuzzling her breasts, proclaiming them to be the best in all of Gamindustri, 'not that there's any competition on that front, Peashy's in the Ultra Dimension after all.' Vert thought to herself. A lewd grin came to her face as she thought about what was going on and wondered if she could convince Neptune to try a sister sandwich like the smaller CPU had jokingly said that one time.
The only thing that kept her from making such a request was the fact that there was a second Neptune, for some reason, nuzzling her thighs and groping her butt. "Um... What's going on?"
"I love ya, Verty!" Both Neptunes proclaimed at the same time and Vert's face turned red.
"HAUH?!"
(-)
In Lastation...
Noire let out a scream of shock. She had been in the shower when the quake happened and had fallen on her butt. But before she could get up, there was a Neptune, who was just as naked as her, helping her up. That would have been enough to make her scream in shock by itself, but the fact that there were three other Neptunes, all as naked as the last one, in the room with her made her wonder if she was dreaming.
"Sis..." Uni poked her head into the bathroom, her face flush. "Oh, there's a bunch here..."
"Uni, what are..." Noire gawked as the door opened fully and there was a Neptune carrying Uni, bridal style. "Hey! Neptune!"
"Yes?" All of the Neptunes said as the same time.
"Put my sister down!" Noire proclaimed.
"Aww, Noire's jealous." One of the naked Neptunes said and picked Noire up, but instead of holding her bridal style, she threw the naked CPU over her shoulder and turned to walk out, Noire's bare butt high in the air.
"H...HEY! Put me down! STOP! DON'T GO OUTSIDE!"
"But you need clothes, so I'm going to your room, now which door was it?" The Neptune that held her asked and opened a random door and was greeted by some of the cleaning staff. "Ooops! Wrong door."
"NOOOO!" Noire screeched in dismay.
Uni was squirming, but found the Neptune that held her had a tight grip on her. "Can you put me down? This is embarrassing."
The Neptune smiled at her and nodded. "Sure, let's go back to your room and get closer."
"Not even remotely what I was hinting at!" Uni yelled, her face red as Neptune ran off with her. "SOMEONE HELP!"
(-)
In Planeptune...
"Compa!" The strawberry blonde and busty nurse stared. She pinched her cheeks. She then rubbed her eyes.
The scene didn't change.
There were five Nep Neps at her table, all looking at her with hungry expressions.
"Puuuuuuuddddding!" They all declared out in chorus.
"...I'm going to need to make a lot of pudding." Compa didn't even question why there were so many Neptunes at her table, this was either the beginning of another new adventure, Nepgear had an experiment that had gone haywire or something very silly that was easy to explain.
"Yay! I love ya, Compa!" All five said at the same time, which caused Compa to smile happily.
"Well, in that case, I'll make my best pudding!" Compa smiled and just went along with the silliness that she was seeing.
(-)
In another apartment, IF, who was laying in bed in just her underwear, looked up at Neptune, who was wearing nothing as she sat on IF's stomach. "Um, Nep... Why are you here?"
"Why do you ask that, Iffy?" Neptune's voice was almost seductive as she leaned in and got close to the brown haired girl, who was blushing hard. "I was thinking we could be more than just... Mere friends."
IF's face turned bright red and she went to push Neptune off but found her hands unable to move. Looking to the side, her eyes widened as she saw a Neptune holding her left hand, turning her head the other way, she saw another Neptune holding her right hand. "WHAT THE HELL IS HAPPENING?!"
(-)
At the Basilicom...
Histoire wondered why there was a Neptune at the work desk, diligently doing paperwork. Normally she would be very happy that such a thing was happening, but there was another Neptune that was holding her close and giggling softly. "Um, can someone explain..."
"AHHHH!" Nepgear screamed as she ran in, wearing pajamas, as several Neptunes chased after her, declaring their undying love for her. "Histoire! What's going on?! Why are there so many Neptunes?"
"That's what abababababababababa..." Histoire was shaking violently before she lit up and a projection lit up on the wall. "Hello, can you call me back, we're having a crisis over here."
The smaller Histoire gave her a dirty look. "You're having a crisis?! I wake up this morning and there's three Neptunes trying to change my batteries, there's a Neptune begging Plutia to go Sadie and punish her and I got a call from Vert, Blanc and Noire saying that they have multiple Neptunes around them, all proclaiming their undying love."
"...So it's happening over there too?" The Neptune at the desk said softly, causing everyone to look at her. She had an embarrassed look on her face. "Um, see, I had a ton of things I had to do today and I found this artifact yesterday that said it would help me get my fondest wishes done."
"Which Neptune are you?" Nepgear asked.
"Not the one of this world, if you were wondering." The one at the desk sighed. "Anyway, in my world, I'm the only CPU that doesn't have anyone really close to me. No little sister, no dedicated helper, no friends, I'm not really a friend to the other CPUs either. I find this artifact and I go "I wish I could have everything I wanted", and the next thing I know, a hole in time and space tears open and a bunch of..." She gestured to the Neptunes around them, "well, mes, suddenly appeared and we got dumped into this dimension. Some ran off to Lowee, some to Leanbox, some to Lastation and some said they felt a dimensional portal nearby, don't ask me how they can feel THAT and ran off."
"That explains a lot." Both Histoires said at the same time.
"...Wait, you don't have a little sister?" Nepgear asked, shocked as that Neptune nodded.
"Yeah, I'm kind of shocked, doesn't feel right." That Neptune shrugged and sighed as one of the other Neptunes suddenly glomped Nepgear and nuzzled her chest while another one nuzzled Nepgear's butt. "And, no, I have NO idea why these... Mes are acting like this either."
"Do you have the artifact in question?" Histoire asked as she tried to ignore the Neptune that was nuzzling her.
"It's broken." Neptune muttered as she lifted up a glove with a bunch of electronics on it.
"I can fix it." Nepgear's eyes started to sparkle. "Oh, um... Can the Neptunes hugging me and... HEY! No!" She spun around and bopped the Neptune that was behind her on the head. "No trying to strip me!"
"Can someone explain to me what the heck is going on?" A new voice spoke up and everyone looked up to see Purple Heart glaring at the Neptunes, causing all of them to stiffen. "First of all, you two, stop trying to lewd my little sister." She pointed at the one who was nuzzling Histoire. "Loosen that hug before I loosen it for you." She then pointed at the one at the desk. "...I'm not sure if I should thank you for doing the paperwork or not."
"I was doing it because I didn't want to go insane with the amount of mes running around."
Purple Heart rubbed her forehead. "Okay, what's going on?"
"Yadda yadda, blah blah." The Neptune at the desk instantly said, getting a nod from Purple Heart.
"Yes, I see. Okay, Nepgear, you take that power glove to the lab and get it fixed so we can fix this." She looked at the wall and blinked in surprise. "This is affecting your dimension too, Mini-Histy?"
"Yes." That Histoire sighed softly. "I'm not sure that I'm ready for a masochistic version of you."
Purple Heart twitched. "Nepgear, hurry, before all of the mes get hungry for pudding." Nepgear was suddenly missing, replaced by a loose cloud of dust and the device was missing from the Neptune's hands. "So..." Purple Heart floated over to the desk and transformed back into Neptune. "Wanna talk about this, Other Me?"
"Sure." The other Neptune said and the two started to talk about stuff.
(-)
An hour later...
"NEPTUNE!" Blanc and Noire yelled as they ran into the Basilicom, followed by several Neptunes.
"Yes?" All of the Neptunes asked at the same time, causing the two CPUs to scream in primal fear.
Behind them, Vert was blushing hard as she was being carried by several Neptunes while sitting on a throne on a scaffold of some sort. "Well, this is certainly... Interesting."
"I love ya, Verty!" All of them said at the same time.
"I really don't get why." A Neptune with a bit of a sour expression on her face grumbled. "I can't stand my dimensions versions of the CPUs."
Both Noire and Blanc had angry expressions on their faces as they pointed at that Neptune. "YOU! THIS IS ALL YOUR FAULT!"
"Yep." That Neptune nodded while another Neptune that was next to her sighed.
"Hey, Noire, Vert, Blanc, before you ask, I'm the Neptune you know."
"Prove it!" Noire demanded and that Neptune suddenly turned into Purple Heart. "Oh. ...Stay like that, it's easier to tell you apart that way."
"Big sis..." Rom was blushing. "Can you tell this Miss Neptune to stop grabbing my butt?"
The next thing anyone knew, a chair hit that Neptune in the face, causing her to fall to the floor with a loud cry.
"...My hand slipped." Purple Heart said as she tried to look innocent.
Ram pouted, she wished that Purple Heart would do that to the Neptune that was braiding her hair.
"Sis!" Nepgear ran into the room. "I fixed it!" She ran over to the Neptune that had a bit of a sour look on her face. "You should..."
Neptune took it, put it on her hand and snapped her fingers, causing all of the Neptunes to suddenly stiffen.
"I don't feel so good..." They all said at the same time before turning into pixels and disappearing.
"Well, that happened." The Neptune with the glove on muttered and she winced as Vert crashed to the ground. Not because she was sympathetic to the other CPU, but because it cracked the floor. "Sorry about the floor."
Purple Heart turned back into Neptune and sighed. "No, that's fine, we can fix that."
"I suppose I should head back home." Neptune said as she played with the device and a white portal opened up behind her. "I apologize, really, for all the insanity that I caused."
"Well, it wasn't that bad." Vert muttered, her face flushed while everyone looked at her with raised eyebrows. "Ahem, the Neptunes who were with me were really nice."
"So you didn't get carried around your Basilicom butt naked then?" Noire asked, muttering in anger.
"Or almost get lewded in front of your sisters." Blanc grumbled while she looked at Rom, who was blushing and Ram, who was trying to fix her hair from the braids that had been put in it. Honestly, Blanc kind of liked the braids.
Noire suddenly stiffened and groaned. "I forgot Uni back in Lastation. I hope she's okay."
(-)
Uni was sweaty, panting and blushing as she laid naked on the bed. "Hmm, maybe I've been going after the wrong Nepsister... ...Or maybe I should try to date both of them?" She buried her face into her hands and blushed more.
(-)
"I hope things are better in Plutie's world." Neptune muttered, wondering what happened over there.
(-)
In the Ultra Dimension...
Plutia had a sad look on her face. "Aww, the fun Neppy disappeared." She had been having so much fun with that Neptune that let her go full sadist on her and she was begging for more. Hearing Neptune's little cries of pain, pleasure and begging for more just made her want to torment her more.
"Pea doesn't have anymore Neptuna's to play with." Peashy pouted. It had been fun to headbutt all of the Neptunes one after the other.
"I don't mind the battery changes, I was getting a bit low and needed new batteries anyway." Histoire muttered, glad the crisis was over. "I wonder how the others are doing."
(-)
In Leanbox...
"Darn." Vert muttered and snapped her fingers. "Now what am I going to do with this whipped cream bikini?"
(-)
In Lowee...
Blanc sighed, glad things were quiet now. At least the Neptunes that had been there were more interested in Copypaste than they were in doing anything other than serving her tea. Personally, she was worried that things would explode with that many Neptunes around her. 'Why do I feel disappointed?'
(-)
In Lastation...
Noire flicked a hand through her hair as she got up off the ground. "...Mr. Badd!" She yelled as she walked out of her office.
"Yes?" Mr. Badd looked at her in confusion.
"I have a proclamation... No one may use others as furniture." Noire declared, much to Mr. Badd's confusion. "Don't question it, just announce it! Oh, and get me some new chairs and couches for my office!"
"Uh, sure."
Noire nodded and walked back in and closed her door, before sighing. "Why did I agree to let those Neptunes convince me to use them as chairs anyway?" She might have been annoyed at Neptune a lot during her time in this world, but she never wanted to do something like that to her. But when the other Neptunes had shown up, broken her furniture and offered to be a replacement, she had taken them up on their offer.
But now that they were gone, she felt really bad about it. "Hmm, I should head over to Neptune's dimension and bring her some pudding as an apology then." As much as she hated to admit it, Neptune was her best friend.
(-)
In the Hyper Dimension...
"Well, this is where I go home." The Neptune with the glove on waved at the others and walked to the portal, before turning to look at Vert. "Question."
"Yes?" Vert blinked in confusion.
"Do you have a younger sister?" Neptune asked, getting a shake from Vert. "Dang it, I was right, my world is messed up if you have a sister and I don't!" She groused and walked through the portal.
"Wait, what's this about a sister?" Vert asked before the portal closed. "Dang it!"
"Well, this was..." Neptune trailed off as the doors to the living room opened up and IF and Compa came in. "Um... Iffy, why do you look like you want to murder someone?"
"I don't know how, I don't know why, but I do know it's your fault," IF had a severely angry expression on her face, "you're going to take responsibility!"
"NEP WHAT?!" Neptune got up and ran to the balcony, transforming into Purple Heart and flying off.
"GET BACK HERE!" IF yelled in anger and huffed. "So... Why was there all those Nep's out there today?"
Nepgear giggled and sat IF down to explain things.
And this is a peek into the random insanity that is my mind. A Nep for all ships! XD