[Twinning, Age Progression, Genderswap]
It was a very special day. And a very young boy was doing his best to prepare for this very special day, even if he didn't know what he could possibly do to make his gratitude known to the one that he looked up to the most.
What was the day, exactly? Why, it was the Admiral's birthday. And while many of his shipgirls were more than happy to give him some form of gift, even if they had to get past a certain harpy that claimed his heart ever since she became his secretary, there was one that didn't try to reach for his love that still wanted to give him a gift that came straight from the heart.
It was the Admiral's younger brother. He originally arrived at the base due to being caught in a skirmish between the different factions that sailed the seas while he was out with his parents, and it was thanks to the swift thinking of his Onii-chan that he and his family remained safe. In the end, it was that event that led to the boy becoming a young member of the staff, hoping to impress his Onii-chan with how much he cared about him and wanted him to keep shining.
But... It was his youth and his inexperience in the field that caused him to wander the halls with a worried blush on his cheeks. He didn't try to talk to any of the shipgirls that looked at him and asked if they could help, because he felt that they wouldn't understand. He just kept trying to run around and figure something out. Maybe a cake? No, a cake wouldn't last. And he couldn't give his Onii-chan one of those rings that he used on secretaries because that meant something more, he knew that much. So what could he do?
As the young boy kept running back and forth throughout the base, avoiding the few shipgirls that tried to stop him by hiding inside a couple of the closets that dotted the base... He eventually ran out of energy and started to lean up against one of the walls, panting and sweating. He really wasn't able to think of anything. And looking through the base for anything that might spark an idea in his head hadn't really worked. He was stuck. What could he give his Onii-chan? What would he actually want as a present? And was it right for him to give him one..?
"Ara... My sweetheart's little brother? And what might you be doing here? Aren't you supposed to be giving your dearest Onii-chan something that he can be proud of?"
The young boy trembled and froze as he heard a seductive and dangerous tone pour through his ear. And sure enough, when he turned his head to look towards the culprit behind that voice, he recognized her immediately. It was his Onii-chan's secretary and wife... And the woman that had done a lot to make sure that he wasn't able to bond with anybody that she didn't approve of. Which was everyone except for the Admiral's younger brother. She was possessive in that way.
Her name was Taihou. And her heart was almost as black as the hair that ran down her shoulders. Just looking at her was enough to send shivers down the young boy's spine, as he tried his best to muster up a few words in the face of the woman that had done so much to keep his Onii-chan for herself. But... She was right. He was supposed to figure out a gift for his Onii-chan. And he hadn't been able to.
"T-Taihou-nee..:" The younger brother sniffled a bit as he grabbed one her sleeve for support. "I... I don't know what Onii-chan might want. And I'm afraid I'll pick something wrong. I just want him to smile and tell me that he loves me and appreciates that I'm here to support him, but... I don't know what I can do that'd make him say that..." The boy, despite how scary the bigger shipgirl was, let his heart spill out. After all, she had managed to worm her way into the young boy's heart and supplanted herself as his 'big sister'. It only made sense to take that role considering her intimate relationship with the Admiral.
Taihou twitched ever so slightly as she heard the word 'love' and 'Onii-chan' in the same sentence. He wasn't about to compete against her in the game of loving the Admiral. But at the same time, she knew exactly what she could say to make sure that he wouldn't become an issue. "Ara... I'm sure that he'd love anything that you give him. He is your Onii-chan after all. As long as you pour your heart into it, he'll respond just as you want him to..." She smiled and kneeled down, looking into the boy's eyes once they were level with one another. "But you want more than that, don't you? You want to give him something he'll truly love, so that the words are as genuine as they can be. Don't you?"
She knew exactly what made him tick. That was why she was Taihou-nee to the boy. And so he nodded, blushing a bit as the older woman pushed her breasts up against his body, just to make sure he wasn't trying to shy away from her. "I... I want Onii-chan to never forget what I give him. Whether it's today, or a year from now, or..." He just wanted to give his Onii-chan something that he could cherish forever. Every year, something new...
And Taihou knew exactly what the boy could do. So much so that she wrapped her arms around him, pushing him into her bosom for just a few moments, before heading into one of the free rooms that lined the hallway they were both in. Anything to get them away from any prying eyes while she put her plan into action.
The young boy trembled as he was stuck in between those two mounds. The mounds that his Onii-chan got to indulge in. Normally, the people that brought attention to them would end up getting really badly hurt by Taihou-nee. Did this mean that she was okay with him touching her? Probably. He just didn't want to ask for fear of her worse traits bubbling to the forefront.
As she let him down on the lone table inside the room, she smiled once she noticed that there happened to be a tv available in the corner. She'd need that later. But for now, she had to make sure that the boy understood what he had to do. "So... What do you think your Onii-chan wants?" She asked a simple question, just to prod at the boy.
"He wants... Something nice? Something that he can use, something that he can keep by his side at all times..." The young boy rattled off qualities that he believed were essential to a good gift for his Onii-chan. As far as he understood, that meant one or more of those things that he just mentioned.
Taihou nodded as she slowly but surely started to climb onto the same table, leaning onto her side as she carefully reached a hand into her bosom. "And what do you think I am?" She asked, prodding a bit more. If he said the wrong thing, well... Her legs were perfectly positioned to deliver him a punishment using her thighs.
"You're nice! You're really useful! And he loves seeing you at his side!" The boy cried out almost on instinct, sweat dripping down his face as he looked towards her. He... He really didn't want her to be mad. He had seen her when she was mad. And that left his Onii-chan trembling as he struggled to get up from his bed...
Taihou smiled as she heard those lovely compliments. "Then all you have to give him is something as good as me. I'm sure you can think of something. Your Onii-chan is such a good man, he'll be easy to impress." She chimed, only for that pleasant smile to turn into a bit of a wicked grin. "But if you really want something special, I have a little gift for you..."
The young officer watched as a blue cube was pulled out from that cleavage. He barely understood what it was. A Wisdom Cube, as far as he had heard. He knew that his Onii-chan had complained about the fact that he didn't have any left. So... Were they all hidden in Taihou-nee's bosom..?
He was barely quick enough to stop the cube from being tossed straight at his face, managing to catch it before it did any kind of damage. As he held it, he looked down at it and his eyes quietly sparkled. "What do I use this for..?" He asked, the subtle glow from the cube growing ever slightly as he held it. As if it was reacting to his innermost wish preemptively...
"These cubes allow for wishes to come true. That's the true Wisdom that they hide. All you have to do is wish for your gift to materialize in front of your eyes, and then you'll get exactly what can make your Onii-chan as happy as possible. Just try it, and you'll see." She chimed, giggling with a venomous edge. "Of course, I had to crush a few wishes to make sure that these were kept nice and hidden. I don't want your Onii-chan to abuse them, because he might get the wrong idea. And so would his other shipgirls..."
The young officer looked down at the cube in his hands, as the slight light was shining across his form. If what she was saying was true, then he really could use it to make his Onii-chan happy. But if he ended up... If he ended up doing something that she didn't approve of, she was probably going to hurt him. Was he going to trust her at this moment? Was he going to believe that Taihou-nee only wanted the best for him and his Onii-chan?
If he kept worrying about it, he wouldn't find out. So he clenched the cube as tightly as he could, as the glow started to consume him completely. All while he whispered quietly and repeatedly.
"I want to give my Onii-chan the best gift ever..."
The Wisdom Cube listened to his wish. And the way that it responded was by pouring all of its wisdom into him. The wisdom that gave birth to shipgirls. A fact that the boy was honestly not aware of, which was why Taihou was busy grinning in the background as the glow started to deepen and darken until it was the same black shade as her hair...
Little by little, the boy's body started to grow. His legs and his arms growing longer until they were properly proportional with an adult's body. Not only that, but any slight bits of masculinity that had developed were washed away as they smoothed out and became a symbol of dominant femininity. And that was just the first step.
His uniform, which had been custom made due to his natural short size, was quickly being popped open by the way that he grew. One button after the next struggling to stay attached. Only the one on his chest was able to endure, but as something started to push out from behind that button, its time in this world would come to an end.
The last button popped free, and the young boy's brand new set of heavy tits bounced freely thanks to a lack of bra. The fact that he had breasts in the first place was enough to make the boy realize something bad was happening, the dark light of the Wisdom Cube making it hard to see what had already gone through, but the weight of his brand new boobies was too hard to ignore despite this setback.
What was happening to him? Why was he growing bigger and more adult? Why did he look like a girl? Why did he have boobies that were just as big as Taihou-nee's? More than that... W-Why did thinking about his Onii-chan slowly but surely make something happen down below? He didn't like it, but it felt good...
Slowly but surely, moans started to pour out from the young boy's lips as they plumped up ever slightly. His hair, which had been short and a lighter shade of black, now started to reach all the way down to his feet. Long twin-tails that matched the ones that Taihou-nee had. Making him look more and more like her, the only thing that stood out between the two being the thing between his thighs and the fact he was nearly naked...
Both of those factors would quickly change as the young boy felt a rush down below, and a powerful moan leaked out from his plumped lips. His underpants were rendered nice and sticky by his last male orgasm, as the bulge shrank and grew nice and smooth. If he were to pull his underpants open, he would find a brand new set of unused lower lips, and touching it would bring his new feminine tone to light. He was no longer a he. He was a she.
Her transformation was brought to a swift end as the Wisdom Cube finally vanished, and a replica of Taihou-nee's outfit started to form on her body. The same sensual red dress with shoulderless sleeves, and the same long stockings that made her thighs stand out. Making her look absolutely identical to Taihou-nee. There was nothing that made them stand apart. They were like two twins. Only one of them hadn't been a boy before.
Slowly but surely, the former boy panted and gasped as she became critically aware of how much things had changed. "W-What... T-Taihou-nee..?" She muttered, utterly confused as she tried to understand what exactly the cube had done. Sure, it had turned her into a copy of Taihou-nee, but why? Didn't she say it'd help her give her Onii-chan... o-onii-chan...
Taihou watched as the former boy quickly started to squirm as she felt a new wave of pure pleasure rush over her. The pleasure of obsessing over the one she loved. That was what drove Taihou. And that was going to drive the newly converted girl as well. "Looks like you took well to the Wisdom Cube's power. I'm sure your Onii-chan will love you like this. Just like he loves me."
"N-No, I-I don't..." The newer of the two girls cried out as her nethers quickly grew way too wet to the point where a puddle of pure pleasure had formed between her thighs. It didn't feel right. It really didn't feel right. But she was enjoying it despite how wrong it felt. She wasn't supposed to feel this hot when she thought about her Onii-channnNNNNN-
Taihou watched as her twin had an immodest climax right then and there, squirting from her brand new pussy just from the thought of her Onii-chan. It was adorable. She was utterly unprepared for the kind of mindset that came with being another version of her. How that obsession would quickly drive somebody to madness. But she could teach her. She could teach her everything that she needed to know to keep herself stable. And everything she needed to know to make her Onii-chan happy.
"There's one more thing I can help you with, 'Taihou-imouto'." The original Taihou mockingly and lovingly called her twin a little sister, as she walked over to the TV that had been sitting there all this time. And with a little tap, powered by the many Wisdom Cubes that were stored within her bosom, it started sparking to life...
Taihou-imouto watched as the screen flickered to life. And there her Onii-chan was. Sitting in front of his desk like he usually did. Doing the necessary paperwork. Just watching him was enough to make her wet. But that wet sensation only intensified as the camera zoomed in and started to focus on what was happening underneath the desk.
Taihou-nee was beneath that desk. Carefully planting kiss after kiss on Onii-chan's crotch. Slowly but surely goading it to growing nice and big as it bulged more and more. She was teasing him in just the right way, even though it risked people realizing that Onii-chan was being teased right in front of their eyes...
Seeing this footage, which quickly flickered from this kind of teasing to outright feminine domination as Taihou-nee moved onto Onii-chan's lap and grinded her body up against his, prompted Taihou-imouto let out more and more moans. So this was what her Onii-chan wanted..? He wanted to be dominated by his secretary..? Then, if Taihou-imouto was now the same as Taihou-nee... T-That meant...
"You want to do all that, don't you, Taihou-imouto?" Taihou-nee whispered into her sister's ear as she slowly stuck her hand into her thoroughly soaked panties. Carefully thrusting one of her fingers into that hungry slit. She wanted to make sure that her imouto's hole was ready to take something as big as her Admiral's rod. Because he was certainly a large lover after how much she had teased him in the past...
Taihou-imouto's attention was split between the teasing done by Taihou-nee, and the way that the recorded version of her continued to bully and love on her Onii-chan. She wanted to be just like the Taihou-nee on screen. She wanted to be just like her. She wanted to dominate her Onii-chan and make him utterly addicted to her. She wanted to make him hers and hers alone... But it was okay if the two shared him. Because they were both Taihou...
As she came to the conclusion that it was going to be alright to share her sweet Onii-chan with his secretary... Taihou-imouto let out another feminine cry as she let it all dribble out. She screamed and she climaxed, more of her juices pouring right out of her barely defiled lower lips as she had her first female orgasm. The best kind of orgasm, because it was the kind of orgasm that she'd feel when she was riding her sweet Onii-chan...
Ahhh... She wanted to try this with him... With Onii-chan..!
---
The Admiral was sitting in his office, slowly drumming his fingers along his desk. Honestly, he had expected to be completely and utterly alone at this hour. Even if it was his birthday. Because Taihou had such an iron grip on his ability to socialize. If she didn't, he would've probably been overwhelmed by the many shipgirls under his command wanting to be with him and only with him. ...Honestly now that he thought about it that would've probably been just as bad, just in a different kind of way. Maybe it was a good thing that she kept him all to herself.
Still, he would've appreciated that at least one person had come to wish him a happy birthday. Whether it was one of the shipgirls, or... Or even his little brother. Sure, he didn't really think it was a good thing that his little brother worked at this base, but he had to admit that the boy had done a lot of work to make himself look like he was worth it. And if he was just a little older, he would've gladly hired him through the official channels.
To see that he hadn't shown up to wish him a happy birthday... Well, it kind of crushed his aging heart. Was he going to end up becoming an old man sixty years too early, only sustained by his incredibly clingy wife? Or was he going to power through it all? There was no way to tell. He just had to sit here and wait until Taihou came by. Then the obvious would happen. At least he'd be able to distract himself that way.
"Onii-chan..."
The Admiral's eyes widened as he swore he heard Taihou's voice. But she spoke in such a way that it reminded him of his younger brother. That didn't make sense. She hadn't tried to get rid of him, had she? He knew that she was clingy and attempted to get rid of any competition, but he wasn't competition. He was a boy that just wanted to prove himself to his older brother...
The door to the office opened, and there was Taihou. But the way that she slowly shambled towards the table, with a bit of juice running down her thigh as her expression melted between desperation and a seductive smile... It made it clear that she wasn't the usual girl. What had happened to her? He did kind of enjoy the way that it contrasted her usual clingy self, even if it managed to unsettle him a bit.
"Taihou, are you alright?" The Admiral said as he slowly got up from his chair, walking around his desk as he tried to put a hand on the woman's shoulder. Anything to make her nice and stable so she wouldn't end up falling over herself...
His kindness was repaid by having the black-haired woman press him against the desk, practically climbing onto him as she slowly started to pant straight onto his face. The desperation in her eyes... And the purity behind it... Was... There was no way, was there?
"Onii-chan... Mmmph, Onii-chaaaan..." Taihou muttered, as she licked her plump lips ever slightly. "Happy Birthday, Onii-chan... Your gift is me..." She chimed, and it all started to click into place. This was... This was his younger brother. How did he turn into another version of Taihou? More than that, how did he end up this needy? It was... it...
Before the Admiral had a moment to question how all of this had come to be, the twinned version of his younger brother managed to force his cock out of his pants, and penetration took place a mere moment later. Their shared moans echoed through the room as something forbidden was taking place. All while the other Taihou watched from the doorframe, giggling at the sight of two siblings making love.
"That's it, Taihou-imouto. You're doing great. Onii-chan can't resist this kind of behavior." Taihou-nee said, her voice barely reaching the other girl. And with that advice, the transformed Taihou-imouto just wrapped her arms around her sweet Onii-chan more, forcing him to thrust deeper into her as a result.
She wanted him. She wanted him to be hers and hers alone. She was only going to share with Taihou-nee, to thank her for helping her find out what she could gift her dearest Onii-chan. She would make him cum, she would make him feel so good that he would never look at anybody except for them. She would make him unable to live without one of them by his side... Ahhh... She'd even spend hours beneath his desk to make sure that he was always hard, just so they could keep having this kind of fun whenever she wanted...
The Admiral was falling into a quick spiral of pleasure thanks to all of this. How was he supposed to stop any of this? He very much did love Taihou as well as his younger brother. And when the two mixed together... It was utterly impossible for him to resist them. Not that he could ever resist them in the first place, because they were the two weak spots that his heart had.
Moans upon moans stacked as former brothers made love to one another. The wet sound of meat slapping into folds joined the moans, the passion growing with every passing second. And knowing what Taihou-imouto like, this wouldn't stop until either of them passed out. They would be locked in pleasure until they couldn't handle any more.
And Taihou-nee just watched. Giggling and enjoying it all, while masturbating a little with her slender fingers. The sight of her lover making love to somebody else was repulsive, but it was another version of her. So it was tolerable on some level.
Besides... This was her gift to him. Somebody else that he could bond with, since he had been longing for it for so long. He just never anticipated it to be another version of her, nor that it was his dear brother...
Ehehehe... They were going to love him for all eternity. Just the two of them loving him with all of their heart. And if anybody tried to take him away... They were going to make sure that they would regret it.
Just the two of them, and their "Onii-chan".