I open my eyes to the sound of my alarm and groggily sat up with a yawn, the night before was full with juggling attending my sister and helping out Histoire with work which left me physically and mentally exhausted.

"Ah, Neptune should still be lazing around in her room. I should go and wake her up."

With that thought in mind, I stagger out my door and towards my sister's room. I opened the door and walked to my still sleeping sister.

"Neptune, wake up it's morning," I say as I gently try to shake her awake.

"Mmm... Five more minutes..."

"Neptune, wake up."

"Hmm? Who's this ikemen fella trying to wake me up? Is this a dream where a handsome hunk wakes me up?" Neptune said half-asleep.

"Neptune."

"Wow, he's even calling me Onee-chan, it's like I have a little brother... Wait, little brother!?"

Neptune jolted up as she shouted.

"W-Who are you!?"

"What are you talking about Neptune? It's me!" I said as I shot her a confused look.

"N-Nepgear? B-But you're a... I'm calling an emergency meeting!"

Neptune ran out of the room in a hurry, leaving me alone and confused.

"What happened to my dear Nepgear!?" Vert barged into the meeting room.

"Ah, Vert. You're the first one here, and it's not even been five minutes since I sent the message."

"Of course! If something happened to my dear Nepgear, I'd... Ah." Vert stopped talking as her face changed from concern to shock.

"Is something the matter?" I asked Vert.

Vert shot a glance towards Neptune who silently nodded in response.

"Instead of standing there Vert, why not come and sit down while we wait for the others to arrive?" Neptune proposed.

"Y-You're right." Vert sighed and walked towards us.

Shortly after, Blanc arrived with Rom and Ram and all three had the same reaction as Vert when they entered. But after the shock, Blanc's face changed like she was thinking about something before shuffling Rom and Ram to where Neptune and Vert were sitting and sat down quietly along with Rom and Ram. The twins were oddly quiet for some reason.

"Why'd you call us here while we were in the middle of...work..." Noire trailed off as she entered through the door.

"What's the matter No..ire." Uni stopped dead in her tracks as she saw the scene in front of her.

"Now now Noire. Come over and sit before we start discussing what happened with Nepgear here." Neptune beckoned the Lastation sisters over.

"R-right." The sisters slowly walked over and took their seats.

Once everyone settled down, Histoire brought in a full body mirror with the help from two Basilicom staff before dismissing them off.

"I've gathered everyone here today to discuss what's happened to Nepgear, what caused this, and is there a way to reverse this." Neptune started the discussion.

"This certainly is a weird development, but what's more offputting is that Neptune's gathered all of us here to discuss about this of all things," Noire said perplexed.

"Mhmm, this is a first and certainly goes against Neptune's pre-established character of being lazy and a woman of inaction." Blanc nodded in agreement.

"Certainly does feel unsettling that Neptune's being all serious and not joking around, I expected her to crack a joke or two but she's been sitting there like G*ndo Ik*ri since I arrived," Vert said.

"Hey! The issue with me can be dealt with afterwards! The main problem now is why my dear sister has turned into a male!" Neptune retorted slamming her hands on the table.

"H-hey, Nepgear," Uni asked me, "do you feel anything different or odd with your body somehow?"

"Huh? Other than the weird feeling I have between my legs and the lightness of my shoulders, I don't feel weird at all... Eh?"

I touched my chest and hurriedly checked my groin before running towards the prepared mirror.

"EEEEEEEEEEEEEEEEH!?"

"You only realised it now that I pointed it out!?" Uni shouted.

A sense of panic assaulted me as I stood there in what seems to be a foreign body different to the one I was in last night.

"W-W-W-What should I do Neptune!?"

"That's what we're here to find out!" Neptune replied.

"Never in the history of Gamindustri has something like this happened," Histoire spoke up, "this is certainly a strange phenomenon that has occurred. Unfortunately, I am unable to assist within this matter."

"So I'm stuck as a male?"

"Regrettably, yes, I'm sorry," Histoire shook her head.

"Wait a sec!" Neptune shouted, "Doesn't this entire thing scream of plot events where Nepgear walks in on us changing or naked in the bath, and slowly over time we start to fall in love with her which results in a harem scenario because she's the only male main character around?"

"If Neptune's making that kind of statement I'm guessing she's back to normal?" Blanc glanced at Neptune.

"My, my. I certainly wouldn't mind being a part of Nepgear's new harem. But now that she's a he, there's plenty of things I can't stop myself from wanting to do! For example..."

Vert grabbed my hand and pushed my head towards her bosom, did her chest always feel this soft?

"H-Hey! That's indecent!" Uni shouted as she pulled me away from Vert's embrace.

"Looks like someone's a little jealous," Vert chuckled.

Uni's face turned into a deep shade of red before releasing my hand, "I-I-I'm not j-j-j-jealous!"

"Hey! Hey! Nepgear!" "Mi- Mr. Nepgear?"

I turn towards the twins who called me out, "Yes?"

"Can you carry us on your shoulders?" Ram asked with sparkles in her eyes.

"Hey, don't bother Nepgear too much," Blanc said to the twins.

"Don't worry, it's fine Blanc," I assure her, "right, who first?"

"Me! Me!" Ram bounced up and down with excitement.

I kneel and lift Ram's small body to my shoulders before ascending.

"Whoa! I'm high up! Like this, I'm taller than Vert!" Ram said with a smile on her face.

"I... want to try too..." Rom said tugging at my sleeve.

As I swapped Ram for Rom, Noire suddenly spoke up, "You can't go out wearing your pyjamas like this now, can you? Also, the clothes you have don't fit your current stature or appearance, so your wardrobe is practically empty now isn't it?"

"You're right, but it's not like Nepgear can step out and shop for clothes, much less any of us for that matter," Vert nodded in agreement.

"Well, since you proposed it, why not you sew it for Nepgear?" Neptune asked.

"Hmm, hmm. Wait. Why me?" Noire shot back.

"That's because you know how to sew and take people's measurements. You custom made those costumes yourself, right? If you weren't a CPU you'd be a great tailor Noire," Neptune responded.

"W-What costumes!? And how did you know I know how to sew?" Noire replied already panicking.

"You don't need to hide it Noire, we all know you do cosplay. Right guys?" Neptune turned to the group and asked where everyone but the twins nodded.

Noire fainted on the spot upon hearing this revelation, muttering 'It's over' like a broken record.

An hour later, Noire regained her composure and begrudgingly took my body measurements. It seems I grew taller with this change in gender, from 154 to 160*.

"Alright then, give me a day or two to get one or two sets of clothes ready. I will contact you once I've finished," Noire said taking off her glasses.

"Oooh! As expected of Noire! Spoken like a true tailor! Ow!" Neptune joked before receiving a chop to her head.

"Anyway, I'm sure Nepgear can handle staying inside for these two days given how she's, I mean he's been attending to this unreliable sister of his for a long time now. So I'm sure there's never a lack of things to do, even while you're doing them in your pyjamas."

"Thank you very much, Noire!" I bowed.

"There's no need to, besides, it might take a while to find a reverse your transformation, and in that time you'll need clothes. So when I've finished with these, do yourself a favour and buy some more clothes alright?" Noire instructed.

"Yes!" I reply with a smile.

"Ugh. That's where the troubles begin huh? That smile, that damned smile of yours," Noire cursed.

"Huh?"

"Nevermind, it's nothing, we'll be off then!" Noire shook her head before turning towards the door.

"Goodbye!" Neptune and I waved as our friends left the room.

"Now that that's done and settled, I'm hungry. Right! Time to go acquire food!" Neptune pumped her fist with determination as she said that.

"Are you okay Neptune? You've been acting strangely," I ask concerned with her behaviour.

"What do ya mean 'Am I okay?' I'm not okay because you became like this! Your sex change is a class SS problem! Histy has been searching for a solution since we began measuring you and you can't step foot outside until Noire delivers your clothes! Therefore, I am going to be a reliable older sister until you can leave the Basilicom in regular clothes." Neptune proclaimed.

"That is certainly uncharacteristic of you to do something like this. But it is like you to step up to the plate and do something when a problem occurs with one of us, even if it is for two days. I'll be in your care until then!" I reply with a smile.

"Geh! An insult followed by praise accompanied by a gentle smile. That truly is a destructive combination most harem protagonists use. Noire was right, that smile is a problem and sooner or later what I fear will happen will take place, and that's the point of no return," Neptune flinched, "right! I'm gonna head out and be a good sister for now!"

I watched as Neptune dashed out the door, leaving me behind. This sudden change from lazy to somewhat reliable older sister may be temporary, but it's still settling to see it happen.

With nothing else to do, I decide to head back to my room and continue tinkering with stuff to pass the time.

"Ah, this dress."

Looking through my stuff for things to tamper with I found a dress I recently bought. It's a magenta lolita-esque dress that I bought on impulse, and I wanted to wear it the next time I went out with Uni. But alas, this dress is now a wasted investment now that I'm a boy. The pairs of underwear in my drawer are also equally useless now.

"Speaking of underwear..."

I slowly removed my pyjamas blushing all the way. Even though it's my own body, my mind is still that of a girl's.

"T-That thing will be there right?"

I tilted my head downwards towards my groin, and to no one's surprise, it's there, covered by my panties. I turn towards the mirror in my room to look at my whole body.

"Wearing female underwear in a male body feels disgusting. Wait, does that mean I'll have to go commando for the entire time while I wait for Noire's clothes!?"

I slowly started to panic over going commando, even as a girl I've never done anything of that sort.

"Should I call Noire and ask? Can she even make men's underwear? I don't want to bother her while she's probably doing her work, but I can't possibly go out without undergarments! That'd be too embarrassing!"

I walked around my room racking my head for a solution when someone knocked on my door.

"Excuse me Lady, er, Sir Nepgear. I don't suppose you have any undergarments now do you?"

"Staff-san! Why, no. I suppose not."

"If you'd like I can buy a set for you, you don't have to repay me just think of this as a gesture of goodwill."

"Yes please, and thank you!"

As I hear his footsteps move away from the door, I heaved a sigh of relief. That's one problem partially dealt with.

"I wonder when Neptune will be back? I hope she's not lost in her city, and I do hope she brings back actual food."

A few hours later, Neptune arrived with plastic bags in her hands.

"I'm back Nepgear! Oh? You're sorting out your stuff?" Neptune said while taking out the contents of the plastic bags. Two sets of takeaway food, some food skewers, two cans of soda, and two cups of pudding. From where those two cups came from I saw easily tons more.

"Umm, Neptune, how much did you spend?"

"I don't remember teehee!"

I sigh as she said that in that dumb cliche pose, well at least she did get food by herself for once and surprisingly didn't get distracted.

"Shame all these dresses you have don't go with you now, how about we put em all in a box?" Neptune said looking around.

"You show interest in cleaning up for once, colour me surprised."

"Well, you're currently too handsome to look good cross-dressing, so it'd be best to keep all your girl stuff away to make room for some of the shirts and jeans you're getting. Your old jeans won't fit anymore either, so it's time to shovel em out!"

"Are you okay Neptune? You've been acting weird since I've turned into a guy, no not weird, you've gone out of character already..." I sigh, "Also, I'm surprised you even called me handsome."

"Don't make that 'Are you serious?' face at me! I'm perfectly fine!" Neptune puffed up her chest as she objected against my claim.

"Yep, you're definitely off your character. Wait! You must be an imposter! Give me back my sister!"

"What're you talking about? I'm not an imposter! Also, don't speak with food in your mouth!"

"Prove you're not an imposter then!" I said as I hurriedly swallowed my food.

"How's this?" Neptune said as light enveloped her body and there she stood in HDD form. "Now do you believe me, idiot brother?"

Forced to eat my own words on the imposter subject I sighed as she turned back to her human form. Now that I've taken a look, I never realised how big she grows in some places while in HDD. Is this how men see parts of a woman?

We finished up lunch after that somewhat ridiculous exchange, and to my surprise, Neptune started cleaning up! Though it's no place for me to say this as it usually's my sister's gig but seriously, what are you doing writing Neptune to become like this? This is more than weird compared to my sudden sex change. Then again, I'm not sure if that gig was Neptune's thing. No point in thinking about it now that it's out there.

Wait a minute, couldn't I have asked Staff-san earlier to buy me clothes alongside my undergarments as well? Sure he didn't know my size, but I remember from when Noire measured me. It definitely can't be an XS or S so maybe M? Is this another one of your dang tricks or realisations that just happened and didn't think about it before!?

I sigh as someone knocked on my door.

"Sir Nepgear, I've got your undergarments as well as a shirt and a pair of pants. I'll leave them by your door."

"Thanks!"

Noire, I'm sorry to have wasted your time, effort and resources but at least you can now sew clothes to crossplay as a guy right?

I stood up, opened the door, took what Staff-san left there and went to the bath.

* - Approximately 5'3" for those not using the metric system

It's been a while. Kept ya waiting huh? (I doubt it). First story I've done in a long while, feels rusty, probably is. Nothing much to say here other than that this idea came about while I was looking through gender bender hentai lmao. Take what you will about this.