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

It was a peaceful day in Planeptune, the weather was clear, the CPU was doing whatever she did, her younger sister was working on something and Histoire was getting frustrated with both of them.

But this story isn't about that as the story is more focused on a small hut on the outskirts of Planeptune city where a little bunny girl was busy working away at her newest alchemic creation. "Hmm, Gust not sure if this is good or not." The little bunny girl looked at the chocolate ball in front of her. "Gust sure that Gust used all the right ingredients, but Gust not sure about the effects on humans." She shivered softly. "This supposed to be temporary measure, but if permanent, then could be very bad."

"How bad?" A familiar voice behind her spoke up, though Gust couldn't figure where she heard it before.

"Well, Gust thinks that maybe person have loss of sense of self or worse might accidentally die. Side effects are unknown."

"So what would happen if a CPU ate it?"

"Gust doesn't know." She turned to look at the person behind her. "You're UNGH!" She cried as she was hit on the head.

The person who hit her laughed and took the chocolate ball from Gust's hands. "Heh!" The person grinned savagely. "Finally, after all these years, I'll get my revenge on those lousy CPUs. At least one of them." And the person knew exactly which CPU to target.

(-)

Walking around Planeptune, Neptune, CPU of Planeptune smiled as she finished playing with some of the children. They had needed an extra person to help them play jump rope and she had volunteered to help move the rope so the children could jump and play. When it had been her turn to play in the jump rope, she had done so poorly that she had ended up wrapped in the ropes and was laughed at by the kids.

Not that she minded, she had done that on purpose after all.

"Excuse me." A voice that Neptune couldn't quite place spoke up and she turned to see a young woman in a yellow sundress and a wide-brimmed hat. "Are you the CPU?" She asked, though the brim of the hat was covering her face and Neptune could see that the girl had a really pale complexion for some reason.

"Yep, that's me." Neptune smiled at her. "Can I do something for you?"

"Well, I wanted to thank you," the girl was stammering, "a, and I thought that you'd like some home-made candy."

"Oooh!" Neptune's eyes perked up as the girl opened her hand to reveal a chocolate ball in a small plastic bag. "Are you sure?"

"Yes, you're the CPU."

"Aw, shucks!" Neptune blushed as she took the plastic bag from the girl and took the chocolate ball from inside and ate it. "Mmm! Tasty!" She cooed happily. "Not as good as Nep Jr.'s slightly melted caramel chocolate candy, but still pretty good." She said before swallowing it. "Mmmm! Too bad you didn't have more."

"The rest exploded in the oven." The girl said, her voice shy.

"Well, that's... Ooh..." Neptune grimaced as she felt something weird with her body.

"HA!" The girl threw off her hat to reveal green hair and red eyes. "I bet you forgot about me, didn't you? Frontline specialist of ASIC, Linda!"

"...Who?" Neptune asked, groaning as the weird feeling increased. "Nevermind, I need to go."

Linda smirked as Neptune staggered off, heading towards the Basilicom. "Mwahahahaha! My revenge will be GOOG!" Her eyes bugged out as a random flying board slammed into her head from the side.

"Sorry about that, miss!" A large man wearing a hard hat said as he came across a badly injured Linda. "That one slipped out of my hands."

Linda just twitched, her eyes swirling in pain.

(-)

Three minutes later, Neptune got to the Basilicom, doubled over in pain and groaning heavily. "H...Histy." She croaked out, her voice was sore and her face was all sweaty.

"Goodness!" Nepgear gasped as she saw Neptune's state. Running up to her sister, she put her hand on Neptune's forehead. "Hang on, I'll get you to the medical bay."

"Thanks, Nep Jr." Neptune's voice was sore. She shuddered, it felt like her whole body was on fire.

(-)

After getting Neptune to the medical bay and getting the Basilicom medical staff to check on her sister, Nepgear could only look at Neptune's prone form with worry. "What happened, Neptune?" She asked and gasped as Neptune started to jerk and twist on the bed. "Neptune!"

"Tie her down!" One of the staff members said as they pulled out some thick straps and put them down on Neptune to keep her from moving and hurting herself.

"Only good thing I can say..." The nurse that was watching Neptune's vitals said after they had gotten Neptune tied down. "Her vitals aren't dropping at least."

"That's good." Histoire said, looking at Neptune in worry. She turned to look at Nepgear, who was looking like she was about to have a panic attack. "Nepgear," Nepgear looked at her and Histoire gave her a soft smile. "Let's go and try to take our mind off of what's going on. I'm sure that Neptune will be fine. In fact, if we work hard so that the Shares go up, that will only help her recover from whatever she caught."

Nepgear nodded, that sounded good.

After Nepgear left, Histoire looked at the medical crew. "Needless to say, you will keep quiet about this." They all nodded. "And if there's a change in her condition, you will contact me or Nepgear ASAP, understand?"

"Of course!"

Histoire sighed and hoped that things would get back to normal fast.

(-)

Hours later...

Neptune groaned and slowly sat up. "My clothes feel really tight for some reason."

"Lady Neptune!" One of the medics said happily. "Hold on, let me remove those straps!"

"Huh?" Neptune looked at the straps that were there. "What happened?"

"Well, you came home looking really unwell and then you started thrashing on the bed, so we had to tie you down so you wouldn't hurt yourself or anyone." The medic said.

Neptune nodded and stood up and groaned. "Urgh, bathroom..."

"Of course." The medic nodded and moved out of the way as Neptune ran to the bathroom. "Huh, strange, Lady Neptune seems taller for some reason." Normally it took Neptune jumping around in her hoodie to get a flash of her panties, but now her underwear was easily visible as she ran to the bathroom.

(-)

Neptune sighed after entering the bathroom and slipped out of the hoodie and grabbed her panties and pulled down. "Now let's..." Neptune's eyes stared in shock.

Neptune blinked a few times.

Neptune pinched her cheek a few times.

"...Okay..."

(-)

"So Neptune's awake now?" Nepgear asked the medical staff as the two walked towards the medical room.

"That's right, Lady Neptune..."

"WHAT THE UNHOLY NEP IS THIS?!"

Nepgear and the medical staff member glanced at each other and ran with all haste towards where Neptune was.

(-)

"Neptune!" Nepgear ran into the bathroom. "What's... WHAT THE GOODNESS?!"

Neptune was looking at Nepgear, eyes tearing up. "Nep Jr., I...I..."

"Lady Neptune, what's..." The medical staff member stared in shock as she saw Neptune standing there naked. "...Lady Neptune, when did you grow a penis?"

"WAAAAAAAAAGH!" Neptune screamed while Nepgear just decided it would be easier to pass out.

(-)

"There's no doubt about it." The doctor said as Neptune sat on the medical bed in shorts and hoodie, looking morose. "You've somehow turned into a boy."

"But I'm supposed to be a cute girl with the best butt amongst the CPUs!" Neptune cried in dismay. "I can't be a boy! That will totally alienate fans and kill the sales of all future games!"

"Neptune..." Histoire patted the neo-boy on the shoulder. "Please calm down. We'll figure this out. Randomly changing genders is weird, even for Gamindustri." Neptune nodded slowly. "If someone randomly changed, then it has to be the work of someone nefarious, right?"

Neptune frowned as he tried to think back as to what happened. "AH! It has to be that Underling!"

Histoire blinked in surprise. "Underling? But she hasn't been seen since ASIC went under."

"I know!" Neptune nodded. "She had this candy ball and gave it to me and then after that, I turn into a boy!"

"Oh, so that's what happened." A new voice spoke up and everyone looked up to see a small rabbit girl looking at Neptune with curiosity on her face.

"Gusty!" Neptune smiled before grimacing at how his voice was now a few octaves lower than he was used to hearing.

"Gust was coming here to request help in tracking down new experimental drug that Gust made, but it seems that Neptune consumed it and it swapped her gender."

"So you know why my sis, err, brother is like this then," Nepgear sighed in relief, causing Neptune to give her a bit an angry glare, "so how long will this last?"

Gust shook her head. "Gust does not know. It could be over before bed tonight, tomorrow sometime, a month later or be permanent. Gust did not have enough time to do experiments."

"Ah, Neppit!" Neptune groaned. "Will people even put their faith in a male CPU?!"

"Hmm," Nepgear tapped her chin, "we can explain it as you helping out with an experiment too dangerous for most people to take part in and it had an unfortunate side effect that made you swap genders."

Neptune sighed and hung his head. "Neppit!"

"Don't worry!" Gust smiled. "Gust still has all notes on this, so Gust will work hard to find out all side effects and see about undoing this."

"Please hurry." Neptune groaned. "Because I have one really important thing that needs to be addressed."

"Yes?" Nepgear asked.

"NONE OF MY CLOTHES WILL FIT ME AS A BOY!" Neptune yelled out in frustration and stood up before doubling over and clutching at his crotch. "AND HOW DO BOYS WALK WITH THESE DANGLY PARTS?!"

Everyone sweat-dropped heavily.

"Gust will hurry and find cure."

"Please do." Histoire nodded.

Okay, so this is more of a teaser than anything else.

1: Should I continue this?

2: If I do, would any of you object if I turned this into a lemon one-shot with male Neptune? If so, I'll make a lemony one-shots story.