Hyperdimension Neptunia belongs to Compile Heart, Idea Factory, Sega and whomever else worked on it.

This was inspired by what someone said to me on Discord. You know who you are!

"So what is this place?" Black Sister asked as she and Purple Sister landed on a small island to the West of Planeptune.

"It's an island, silly." Purple Sister giggled as she transformed back into her human form. Unlike her normal attire, Nepgear was wearing a bikini. "It's not on any maps, and I thought we could use a vacation."

Black Sister grumbled and transformed back into her human form, though she was wearing a black bikini and sandals. "Okay, I get that, but..." She jumped when she felt Nepgear's hands on her shoulders.

Leaning in, Nepgear giggled. "Come on, Uni. Just the two of us? Alone?" She squeezed Uni's shoulders as Uni blushed hard. "We can do a~n~y thing we want together."

Uni's face turned so red that steam started to come out of her ears.

Nepgear giggled and wrapped her arms around Uni's stomach. "You're so cute when you're like this."

Before Uni could answer, there was a rumbling as a giant Dragon-like creature came out of the water and roared as another giant creature, this one a giant squid, also came out of the water.

"...Should we take care of that?" Uni asked as the creatures battled. "I mean, what if they take the fight to Planeptune?"

Nepgear sighed and nodded as she let go of the hug. "Yeah..." Her eyes gleamed as she spun Uni around and buried her face into Uni's chest. "Goodbye, you two, I'll miss you while Uni's transformed."

"H-HEY!" Uni yelled and bonked Nepgear on the top of the head. "Not cool!" She yelled while transforming. "I'll make you pay for that later."

Nepgear giggled and transformed as well. "I look forward to it."

(-)

Back in Planeptune...

Neptune twitched as she looked at Noire and Vert, who had both came crashing into her living room. "So, Verty! Nowa! What can I do for the both of ya?"

"Have you seen Uni?" Noire asked, concern in her voice. "I haven't seen her since last night and I was a little worried about her."

"And I was wanting to spend some time with Nepgear today." Vert proclaimed, getting an annoyed look from Neptune in response. "What? You'll probably just use her as a maid again."

"I haven't done that since I got back from Ultra, you know that!" Neptune shot back, annoyed that Vert kept harping on and on about how she had been a bad big sister. 'Sheesh, between her, Histy and Iffy, I'm getting sick of hearing about it.'

"She still makes you breakfast." Vert countered.

"...She likes to cook."

Noire smirked at that. "Besides, if Neptune cooked, the whole place would be on fire." Vert thought about it and nodded.

"Very true."

"Anyway, ignoring Vert's attempt at NTRing your little sister," Noire continued as she gave Neptune a sharp look, "do you know where Uni is?"

"Hmm... Nope." Neptune shook her head. "And even if I did know where she and Nep Jr. was, I don't think I'd tell two people who broke my window." She pointed at the broken glass behind them.

"Come on, Neptune," Noire sighed heavily. "I'll pay to fix it, okay?"

"I suppose I could have been a little more considerate, myself." Vert answered, an embarrassed look on her face. "But I had been looking forward to this for quite some time and I just wanted to spend some quality time with my dear little sister and give her the affection she so rightfully..."

"They took off to a beach somewhere." Neptune interrupted Vert. "So they could be alone. ALL alone!" She sweat-dropped at the looks the other two CPUs gave her. "...You know that they're dating, right?"

"Since when?!" Both of them yelled in shock.

"Hmm... Probably since the time we were being tentacled in the graveyard, I dunno." Neptune shrugged and turned back to her video game. "Now you two can go home, go look at every beach if you want, or stay here and play. I'm not telling you where they are."

"Why not!?" Both of them yelled at her.

"Hmm..." Neptune tapped her chin. "Because Uni came over this morning complaining about how Nowa wasn't doing her work and she needed a vacation and Nepgear wanted to spend time with her girlfriend and I told them where to go for a good vacation."

Both Noire and Vert pouted, but they couldn't really argue against that.

"...I hope that the giant monsters aren't around right now." Neptune muttered to herself softly.

"Giant monsters?!"

(-)

Two hours later...

Black Sister panted as she flopped onto the beach with Purple Sister right next to her. "I thought... This... Was supposed to be a vacation."

"It... Is..." Purple Sister panted and groaned in dismay as she laid on her back.

After a few minutes, both of them turned back to their normal forms and Uni rolled over and on top of Nepgear. "Uni?"

"..." Uni was blushing hard and looked at Nepgear. "...Want to try lewd things on the beach?"

Nepgear's eyes lit up happily. "Sure!" Her hands went to Uni's chest and gave the black-haired girl's boobs a squeeze. "Welcome back, you two, I missed you."

Uni just pouted, but that disappeared as the two had fun that, sadly, couldn't be described due to the ratings.

I hope you enjoyed.

BTW, they didn't kill the monsters, they just made them go home, if that's what you were wondering.