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

Humming a tune to herself, Histoire, Oracle of Planeptune, was in a really good mood as of late.

An extremely good mood, in fact. The Basilicom staff members couldn't recall a time when she was so... Smiley and cheerful.

Some thought it was because Lady Neptune had started working diligently. Some wondered if Lady Neptune had stepped down as the CPU and Lady Nepgear was the one running Planeptune, but as there was no announcement, that idea didn't get much traction.

"Hello, Histoire." Nepgear said as she walked past and saw Histoire so happy. "Did something good happen?"

"Oh, I'm just so happy with how Planeptune's shares are lately." Histoire couldn't help but be impressed. For once Planeptune wasn't in last place amongst the nations. In fact, Planeptune had actually edged out Lowee for second place.

"That's good." Nepgear smiled, though privately she was wondering how Planeptune's shares were so high. Neptune was spending all day sleeping lately and she always looked so tired when she did get up. "Is Neptune still sleeping?"

Histoire nodded at her. "I don't know what she's doing, but since the shares are doing so well, I think that it would be okay to let her sleep." Histoire suddenly blinked as she realized something. "If you'll excuse me, I need to do some research. It will take me three hours."

"Of course." Nepgear nodded and watched Histoire float off. Shrugging, she walked into the Basilicom. She was going to go and check on Neptune to make sure that she was okay.

When she got to her sister's room, she stared in shock as Neptune was missing. "Okay, Nepgear, calm down, there's no reason to panic, maybe sis ran to Lastation, you know how she likes to pester Noire." Pulling out her phone, she dialed Noire's personal number.

"Hello, Nepgear."

"Hey, Noire, is Neptune visiting you?"

"Huh? No. I haven't seen her in the past couple of months. I'm kind of miss, err, worried... Yeah... I'm worried since she usually comes over at least once a week to bother me."

Nepgear giggled softly. "Okay, thanks. If you see her, give me a call, please?"

"Sure."

Nepgear hung up the phone and made a call to Vert, hoping that the blonde wasn't too busy playing MMOs again.

"Hello, Nepgear, how can your big sister help you?"

Nepgear sweat-dropped heavily. There was no point in correcting Vert on this issue. The only one who even bothered to try anymore was Neptune and even then, it was only when Nepgear had her face buried in Vert's boobs that she bothered to get upset about it. "Hello, Vert, I was wondering, have you seen Neptune lately?" She asked as she turned and walked out of Neptune's room.

"Hmm? Neptune? No. In fact, it's been so long since I saw her that I was beginning to wonder if I was kicked out of the group without knowing about it. Usually Neptune comes over to bother me for some tea or to play some games together." Vert's voice had a note of concern. "Shockingly I'm in-between games right now, so I'll take a quick look around Leanbox to see if she's around here for some reason and I didn't know."

"Alright, thanks." Nepgear smiled and hung up the phone before making one last call. "Hello, Blanc?"

"What do you want?" Blanc's voice was tense and Nepgear blinked in surprise. "Did you call to gloat because your shares are higher than mine?"

"What? No!" Nepgear gasped in shock. "I was merely wondering if you had seen Neptune. No one's seen her lately."

"Huh? No, I haven't." Blanc's voice was more subdued and normal, much to Nepgear's relief. "Did she work herself to death?"

"Don't say that!" Nepgear cried over the phone and Blanc sighed.

"Sorry, I'm just surprised how well Planeptune's doing and I'm wondering what happened. I'll see if Neptune's in the country, okay?"

"Thanks." Nepgear smiled and hung up the phone. "Hmm, if no one's seen Neptune, then..." Well, she could at least look around the city to see if anyone had seen her sister.

(-)

Several hours later...

"Lady Neptune?" A young man at the park slowly shook his head. "No, I'm sorry Lady Nepgear, but I haven't seen your sister lately."

"That's fine, thank you." Nepgear smiled at him and turned to leave. As she turned to leave, she could have sworn that she saw a relieved look cross the man's face for some reason.

Sighing as there were no new leads, Nepgear went back to the Basilicom and hoped that Histoire had some news for her.

(-)

"Ah! Nepgear." Histoire perked up as she saw the CPU Candidate. "Well, I discovered something interesting." Nepgear nodded, fully intending on listening in. "You know how Neptune's been sleeping in a lot more lately and looking really tired when she does so? Well, ever since she started to do that, Planeptune's shares have gone up."

"...Don't tell me that the people think Neptune isn't a good CPU and that their faith in her goes down when she's up!" Nepgear gasped, horrifed at such a thought.

"I..." Histoire stared at Nepgear. "I don't think that's how it works." In fact, she was certain that wasn't how it worked. "Do you know where Neptune is?"

Nepgear shook her head. "No. I asked the other CPUs, none of them have seen Neptune, and I even went around the city and no one's seen Neptune lately."

Histoire frowned softly. "Most... Odd... Just what is Neptune doing?"

Nepgear started to look distraught. "Neptune..." She didn't know what to do in this situation. "Histoire, what should we do?"

Histoire cupped her chin and thought for awhile. "I don't know. I'll stay up late to keep an eye out for Neptune. Why don't you go to your lab and work on something to take your mind off of Neptune right now?"

Nepgear nodded and went to do that.

(-)

Opening the door to her lap, Nepgear reached for the light but stopped as she heard what sounded like a chainsaw going off. "What the goodness?!" She yelped and flipped the lights on and transformed into her HDD form.

"NNNNGH!" A familiar and welcome groan greeted her. "Jeez!" Neptune, who had been laying on one of her work tables, groaned and sat up. "I was trying to get sum sleep, Nep Jr. What are you... Huh? This isn't my room."

"Neptune!" Purple Sister cheered and rushed forward, hugging Neptune tightly. "What happened?! Where have you been lately?"

"Aaaaaaaaiiiirrrr!" Neptune gasped and was very thankful when Purple Sister let go and transformed back into Nepgear. "I guess I'm more tired than I thought, I got back and I swore this was my room. It explains why my bed was so hard." She laughed and rubbed the back of her head while sliding off the table.

"Neptune..." Nepgear gave her sister a worried look. "What's been going on? Even the other CPUs are worried about you."

"Nep what?" Neptune blinked a few times. "Well, see... I was minding my own business one day while walking across Planeptune and there was this rich guy, he comes up to me and asks me to do some stuff with him."

Nepgear stared at her sister. "...Stuff with him?"

Neptune nodded. "Yeah. I was a little concerned at first, but, hey, I'm the CPU," Neptune shrugged, "if he's a bad guy I can transform and beat him up, right?" She smiled when Nepgear nodded. "Well, he took me to this building that wasn't really marked at all."

"...Neptune, the more you talk about this stuff, the more... Um... Shady it's sounding." Nepgear pointed out.

Neptune scratched her head and thought about it. "Huh, you know, you're right. Anyway, when we got there, there were a bunch of other people there with all sorts of equipment and they were smiling at me." She tilted her head in confusion as Nepgear was staring and starting to blush. "Anyway," she decided to ignore whatever was going through her sister's mind at that moment, "I get asked to go HDD and try a bunch of different things out." Neptune sighed softly. "It was so tiring. They weren't bad guys, but they sure were rough on me. If my HDD self wasn't so durable, I'd swear I'd have bruises on parts of my body."

"Um..." Nepgear wasn't sure what happened, but it didn't sound like it was a lot of fun.

"At the end, the session was really good." Neptune smiled at her sister. "After that, I was asked to come back every night and I was like 'okay' because it wasn't that bad. But the sessions last hours and I'm always a sweaty mess at the end of them." Nepgear was openly gawking and blushing really hard at that point. "And the sessions always end right before sunrise too." Neptune pouted at that. "But I can't complain, they were right about how the sessions have helped our shares go through the roof lately!"

"...Neptune... What kind of sessions have you been having?" Nepgear was almost afraid to ask because she was worried that someone was doing extremely lewd things to her sister.

"Huh?" Neptune blinked before pulling out her phone and opening up a program before handing it over to Nepgear. "Photography!"

"HUH?!" Nepgear gawked as she looked at the images on Neptune's phone.

There were images of Neptune and images of Purple Heart... Most of them were of the two in various states of dress. There were some of Purple Heart holding a towel over her breasts and the towel was just long enough to cover her crotch and it looked like Purple Heart wasn't wearing anything else. There were images of Neptune looking over her shoulder while pulling up a pair of panties and most of her butt was exposed to the camera. There were even images of Purple Heart's backside completely exposed to the camera, yet still not showing any naughty bits. Some of them even had some side boob shots of Purple Heart.

"...Gravure modeling?!" Nepgear gaped in surprise. "Wait, THAT'S why the shares are so high?!"

"Yeah." Neptune nodded and sighed, looking exhausted. "My last session was last night. I want to sleep for a week now." She tilted her head in confusion. "So... Nep Jr., what did you THINK I was doing?" She asked while taking her phone back from Nepgear.

"...I thought you were being tricked by guys to do extremely lewd and perverted things."

Neptune gawked at her sister as she blushed hard. "Of course not! Only way I'd be doing that is if this fic was rated M, silly!"

Nepgear sighed in relief. "I'm glad that you weren't doing stuff out of a hentai comic."

Neptune suddenly had a lewd grin on her face. "Why? Would you have wanted to see me doing that stuff?"

"...Maybe?" Nepgear said, her face turning scarlet out of embarrassment.

Neptune face-faulted and groaned in dismay. "My sister, ladies and gentlemen. I love her to death, but she's a total siscon sometimes."

If you thought Neptune was doing something else, you're a dirty pervert!

...

Which is fine, because that's what you were supposed to think!

Gravure Idols do photo-shoots with them in various provocative clothing and poses. Generally not nude, but lots of skin showing.

Inspired by... I'd like to say a manga chapter where Neptune and Nepgear created collectible cards that caused their shares to inflate but then everyone copied them and the photos got more and more risque until there were some explosions and everyone agreed it was for the best that they didn't do that again.