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Trading Places (Lysithea & Byleth bodyswap tf story)
🕑 Added 2025-11-03 07:41:02 +0000 UTCHere it is, the full story. Still gotta do a proper final proofread of everything. Anyway, enjoy.
It was a calm, breezy evening at the Officer’s Academy, an elite facility that trained students in the ways of weapons and magic. Located within a giant Monastery, the royalty and nobility of several great factions sent their heirs to the academy in order to learn the art of warfare. It was all to build up the next generation of rulers. So needless to say, much pressure resided on the students and those who taught them.
On this particular evening, after a rigorous course in magical defense, one of the academy’s prodigies of magic, Lysithea, isolated herself against a large, stone wall not too far from the teacher’s office. She twiddled her thumbs, lost in turmoil over how to proceed. Feelings had been stirring in her for quite some time, and now she was contemplating whether to take the next step in revealing them to the one she had become smitten with. That person was her teacher.
Come now Lysithea, you’ve got this, the beautiful, silver-haired woman thought to herself. It’ll hardly be different from the banter you make daily with them. I’m not scared!
As much as she tried hyping herself up though, her nerves were obvious. For someone almost solely fixated on their studies, admitting you loved someone felt like an even greater challenge than her magical studies. Her magic capabilities felt like a reward which came from her hard work and dutiful study. Some would say it was due to her special crests, ones that had been implanted on her during experiments.
She would not have any of that! She refused to be seen as weak or that she couldn’t do something! She would not stand for the progress she had made being reduced to mere experiments! The young woman wanted to be strong, smart and seen as the responsible, capable adult she viewed herself as. Just like the teacher she admired and held in such high esteem… the one she couldn’t handle the thought of being rejected by.
Lysithea pulled out a glimmering trinket from the vest pocket of her black, regal academy uniform. It was a small, brass colored sculpture of two tightly bound knots in the shape of what appeared to be a flower mid-bloom. She had no clue what it represented, but it had become a good luck charm of sorts to her ever since she bought it out on an academy excursion. Her beloved teacher, Byleth, had been eyeing it intently, which was enough to draw her own attention. To her it was also as if she and Byleth had shared in some profound connection over the lure of this trinket.
Digging through her heart, Lysithea held onto the image of her teacher. Her crush had become so bad that even the mere sight of her long, flowing, navy blue hair and eyes was enough to make her weak in the knees. She was finding it harder to focus on her studies, so she simply had to get this out in the open and confront it, lest she drown in her insecurities.
“After all…” Lysithea quietly muttered, pointing her gaze down at the trinket nestled carefully within her open palms. “What’s not to like about me?”
A soft, smug expression formed on the woman’s face.
Lysithea, finding her footing, peeled around the corner and into her teacher’s office. She was immediately shaken once more however, by the sight of Byleth undressing from her armor near a wardrobe. She didn’t wear an abundance of armor, but the mere act of her stripping was enough to make Lysithea feel she had walked in on something she shouldn’t have, compelling her eyes to take much deeper notice of her teacher’s appearance that she was already so familiar with. Perfection was before her, dressed within her black, exposed navel top with black shorts, boots and patterned tights. There were some eccentricities to her look as well with the detached white, buttoned up choker with giant gold medallion. It wasn't really a look befitting a teacher, but that only made Lysithea appreciate her more. She exuded an aura of individuality despite her outward finesse as a teacher.
“Oh uh! P-Professor! I didn’t mean to—I uh. I mean, good evening! Hahaha!”
She realized she was already dropping the ball, and turned herself away for a few moments to regain her composure. Byleth, their usual cool and collected self, batted not an eye to her outburst. This made Lysithea's recuperation all the quicker, and she quickly returned to face Byleth. Her professor shot her a smile.
“Lysithea. Class is over. Is there something you need?”
“Well. I came to ask, to let you know uh…”
Damnit, her tongue was tied. She felt like a puny peon in front of her hot, experienced professor.
She slapped herself on the cheeks to snap back to it, alarming Byleth.
“Woah, Lysithea! Are you alright…”
“Yes! Very well, thank you. I’m great in fact! Ahah!”
She took another breath, drinking in the sight of her teacher before settling into her haughty way of speaking once more.
“I merely came here to um. Mhm. I came to thank you for all you’ve done for me Professor. You’ve really helped with my training and uh…”
“Sure. Anytime.”
Say it. Say it. Say it! Lysithea screamed inside her head.
“I-I’d love to train with you again. Your advice is always so useful.”
Byleth looked perplexed.
“Sure. You are in my class as it is, so…”
“Right, right! Hahaha!”
She could feel herself blowing it, still not able to take that step over the line. She decided to take a different approach, to list off all she admired about them.
“Look. B-Byleth.”
Her face went flush. She’d never called her by her name before. It felt good to finally utter it to them face to face.
“It’s not just that. You see… you’re such a wonderful teacher. You account for people’s weaknesses, and capitalize on their strengths. You’re the only one I’ve ever had to praise me! P-Praise me for more than just the power of my crests!”
Byleth was taken back by the sudden, passionate praise being hurled her way. But she stood firm and listened, clearly realizing how important this was for her student. She knew Lysithea was an incredibly hard worker, but also one who isolated herself in her studies, so to have her laying herself bare like this was a welcome sight.
“It just… it makes me happy! Y-YOU MAKE ME HAPPY!”
Lysithea began to tremble, her hands clutching at her trinket as she felt a warmth emanating from it. The glow caught Byleth’s eyes, and she tried speaking up.
“Um, Lysithea. Your hands are—!”
“I want to be closer to you Miss Byleth!!”
The professor’s eyes widened in shock, not so much from the confession, but from the sudden blinding light filling the room. Lysithea was also taken aback by it, dropping the trinket she held as it began to unleash a torrent of pleasant warmth into the space around the two of them.
“Whaah? What’s happening!?” Lysithea shouted, the light quickly fading before she had even finished speaking. However, the intense warmth remained.
The two women stood around awkwardly, clutching at their heads and bosoms, their thighs grinding as a strange heat began to bother them in embarrassing ways.
“L-Lysithea. Are you okay? Huh? Ooooh… what is this f-feeling?”
The student watched her teacher squirm and begin to sweat in erotic fashion. Her own body was caught within a similar state, only made worse by the sight of her affection sticking her hands down towards their—
“EEK! No, no! I’m sorry!” She wailed, suddenly falling to her knees as she sent her own hands down to her nethers, a rush of pleasurable heat throwing her off balance. “You shouldn’t be seeing this, hooooh~.”
She’d been turned on before, but this felt unnatural. No matter how much she rubbed at it, it wouldn’t fade, wouldn’t even budge in reaction to her touch. It ebbed and flowed to its own purpose, a living desire that had nestled itself within her folds.
“Oh noo. Professor. What’s happeninnnghh?”
Byleth powered through best she could on her feet, raising one hand away from her pussy, while still patting at it with the other. She stabilized herself on her desk.
“D-Don’t worry Lysithea. I’ll figure this ooouhh!”
Byleth suddenly fell forward on her desk, the heat shooting throughout her body, bringing her to orgasm.
Lysithea watched her mentor collapse, a wince of confused bliss riddling her face. It was so unbecoming of her. Would the same thing happen to—
“HYUH! Aaahn! N-No, no pleeease! NOOOOOOHHH~!!”
She met the same fate, falling onto her backside, hands dug into her groin as wave after wave of the bizarre, wonderful warmth rolled across her form.
As the two women writhed like uncouth bitches in heat, a pair of sparkling trails of magic began to sprout forth from their pussies, slipping through their fingers. They weaved through the air like cursive, meeting each other and binding together into a tether. Once bound, the unruly pleasure filling their bodies gave a tug down below, snapping them to attention.
Byleth could feel a tug at a sort of heated mass within herself. It traveled outwards and over to her student, where she could somehow feel it mingling with a very different warm mass within her. At the same time, this was happening with Lysithea. It was as if the magical trails were directly connected to each woman’s nethers, and were being drawn out and being forced into the other. And as they began to insert themselves through their vaginal walls, it was unmistakable what the process felt as if it were replicating.
“Wha-What the fuuUUUUH~!!” Lysithea moaned, the magical tendril of her teacher forcing itself deep inside her pussy.
“Hohoooh my goodness!” Byleth moaned in response, her student’s tendril following suit and excitedly wriggling within her.
A cacophony of cries filled the spacious room as the two women felt each other’s magical essence enter the other, worming like an anxious lover into each other’s snatch. Then suddenly, as soon as it had begun, it was over, the two girls left panting in shock. The two rose to their feet speechless and looked at each other with baited breath.
They could sense that something was off. There was a change not just within the air of the room, but inside them as well—the heat inside them still present, but changed. Lysithea pulled up her pair of trembling hands to stare at them, a sense of wrongness permeating her thoughts despite them looking as they always had. Then, before her eyes, she could see the complexion of her nails changing, as well as her fingers elongating. It didn’t take long for her to recognize a familiarity with her now larger hands. These were the hands she had given bewitched glances from across the classroom whenever they pointed at the board. These were the strong hands that had always assisted her in weapon lessons, guiding her grip with their soft, yet firm touch.
“Professor’s… hands?”
Lysithea had little time to gawk, a tremor rippling through her torso. She hugged her sides and winced as all the muscles in her core flexed repeatedly. It felt like the pressure of an invisible corset was binding itself around her, forcing her musculature into tighter, fixed positions. As violent as it was, it felt good though, a sense of hard, bridled strength building within her.
Byleth was worried about her student, and reached out a hand for her before losing balance in her legs and falling back onto the desk, her own onslaught of intense tremors suddenly taking hold. Lysithea seemed unworried about the ordeal regardless, her pussy clenching in excitement as she welcomed the budding power within her abdominals. Maybe it was the sensation of going through a rapid fire workout putting strain on her body, but her endorphins were going crazy, heightening the experience for the better.
“Hoooh can this really be happening? AAAHN! It feels so gooood~!!”
The woman was already picking up on what might be happening to her given what happened to her hands. And if her theory was right, more of her body was turning into the woman of her affections. Byleth was tall and built, so dreamy, so her type. But she never had wondered what it might feel like to possess the same strength and beauty as her. She was welcome to entertain the idea though, as from top to bottom Byleth was a woman she not only loved, but envied, an idol perfect in all the ways that mattered.
Lysithea’s sides scrunched into a finer curve, sending her arching back in bliss. Guttural moans filled the air as she closed her eyes, letting the changes wash over her. Her now toned core tensed under the electric pleasure rattling her down to the bones, bones reshaping through the power brought forth by her desires.
“Hyaaah! Ohoh myyy… mmmm! Oooh yess!”
She could feel her bones contorting beneath her flesh, every kick and crack sending a pleasant tingle towards her crotch. Multiple POPS reverberated out as her spine and limbs hiked up in length, her height rapidly increasing. Whatever fear had gripped her initially was completely washed away, the woman swooning over the feeling of her hardened core and shapely sides. She intimately caressed herself, so close now to that which she had long admired.
“Miss Byleths… body~.”
The true Byleth attempted to grab her student’s attention, but it fell on deaf ears, buried by Lysithea’s giddy moans. The professor could only watch in shock at her student’s form growing in size. Even more concerning, was that her own body was shrinking in tandem, bones creaking with a deep ache under a warm blanket of enticing heat. She found herself throttled by the sensations and hard to think, unable to cease the mass being whittled away. 2 inches, 4 inches, she was in free fall, and before she knew it, Lysithea had overtaken her in height.
Byleth struggled to rouse off her desk, but continued to falter. It was like an earthquake was endlessly shaking the foundation of her limbs. This would’ve been no trouble for her to fight her way through typically, but she was no longer in possession of her body’s old strength. Looking at her arms, they looked thin and fragile. They weren’t sickly by any means, but may as well be malnourished in comparison to their usual toneage she’d built up from years of battles.
It was frightening how much mass she had lost. All around she could feel her clothing slacking and armor slipping off. Her boots, now oversized, even slipped off her feet! Shakily locating the ground beneath her, she made her way off the desk and stared back towards her student. She had witnessed her growing quite tall, but after her own change in stature, Lysithea was now towering above her. The contrast in their heights had completely reversed, the teacher now beneath the student.
The woman then felt a tickle within her scalp and she grabbed at her shoulder length hair. It felt smoother and less unruly than usual, the strands straightening and as she examined it. The lush green color of her locks began fading away, doused by a shimmering silver coat that glowed at the catch of light. Massive side bangs spilled down past her shoulders on each side, and she nervously gulped. Looking ahead of her, she could see the former green of her hair spilling into her student’s. Not only that, Lysithea’s hair was receding in size and becoming wavy. There was no mistaking it, the two had swapped hairstyles.
“Lysithea!” Byleth yelped, her voice squeaking as it shifted from her usual husky tone to something more soft and youthful. “We have to stop th-this…?”
The imposing Lysithea, now in possession of Byleth’s hair—and even eyes—stepped towards her nervous teacher.
“But Miss Byleth, look at me!” The excited lady replied. “I’m so strong and beautiful now. I’m just like you, hee hee.”
“Yes, but you shouldn’t! This is wrong! Look at me!”
Lysithea did, but was undeterred. In fact, the sight of her teacher's smaller body, and growing familiarity to what she saw in a mirror every morning, was stirring something strange within her.
“I’m sorry Miss Byleth,” she said, her eyes rattling as her thoughts began to flood with jumbled recollections of a life unfamiliar to her. “With this body I… I can, oooh~. I can b-become the pride and joy of House Ordelia.”
“What are you talking about Lysithea! We must—hyuh!?”
The tall woman forward, pinning Byleth against the desk, a curious gleam in her eye. Visions of what appeared to be her beloved teacher’s life were playing like a rapid fire movie in her head, the experience channeling within her as if she had lived them herself.
“But more importantly Miss Byleth. I can finally prove my worth and knowledge… as a teacher.”
Byleth saw a wide smile cross Lysithea’s face, an expression she had never seen the girl make. Her eyes shook as she stared off into space, her focus seeming far away in the moment. Byleth reached out and grabbed hold of her, trying to shake some sense back into her. It did draw her attention, but the gaze that met her was one both smug and salacious.
“Oh don’t worry little Byleth~.”
Lysithea grabbed her teacher from under her arms and effortlessly lifted her off the ground.
“I’ll take good care of this body. And of you as well.”
Lysithea squished Byleth’s face into her supple chest and hugged tight. As panicked as Byleth was, the action caused a twinge of embarrassment to flood through her. But that embarrassment soon turned into anxiousness, her heart starting to race. The thumping within her chest was making her sweat profusely, every thunderous beat sending strange shockwaves through her breasts. She tried struggling free at first, but was no match for her student's stolen strength, and eventually went quiet within their embrace. Doing so only made her more nervous, a craving warmth pooling between her legs.
Rubbing her chin against Byleth’s head, Lysithea cheerily giggled and said, “Oohhh little Byleth. I love you!”
Those words sent Byleth’s head spinning, as she experienced her own rush of foreign memories triggered by it. Hundreds of days longing for a teacher that was herself, desiring her body, her position, her confidence. It was absolute chaos within her mind, a chaos matched by the thrashing mass of flesh that was her breasts. The fat within each tit was rippling like waves out towards the body they were squashed against in Lysithea’s. With each impact upon the surface of her body, it was as if mass were being drawn from the boob, their size rapidly decreasing.
”I’ve always loved you Byleth!” Lysithea shouted, declaring her love once more, as well as sending another arrow through her teacher’s confused heart.
Byleth then quickly found herself buried in her student’s chest, as the affectionate hugging escalated. However, they weren’t the typically petite breast of Lysithea. No, they were expanding in size in tandem with Byleth’s own chest shrinking, her face sinking further and further into plush pillows of flesh. Lysithea’s body was avidly stealing from the great warrior and teacher she had so desperately craved.
The memories and knowledge of her teacher flowed with no resistance inside Lysithea’s head by this point. The woman welcomed every ounce of it, feeling her pride swell with each drop, her own memories as Lysithea creeping further and further back into her head, becoming more of a fuzzy recollection. She would be an even better Byleth, she figured, the finest teacher this academy had ever seen. She would prove her worth, leave her mark upon the world through her students!
“Aaaahn~! My s-students! They need meeee!!” Lysithea cried out in ecstasy, her ass and thighs swelling with more voluptuous mass and strength. She truly had stolen everything from Byleth, all but her face.
The original Byleth could do nothing to fight back at this point, floundering within what was once her own chest. Flashes of a life not her own went off like firecrackers in her head, each one jumbling her thoughts and rattling her vision. As dire as the situation was, she could feel herself growing embarrassed, even excited by the ordeal, her body shivering with pleasure as it continued to whittle down into a petite, more elegant form. She felt safe within her teacher’s bosom though, and felt that perhaps this was all okay. Yes, this was right. She was finally getting the attention she had long craved from Miss Byleth~.
“N-N-Nooo! Wait!” Byleth pleaded, her words muffled by the breasts sandwiching her face. Her return to clarity was short lived however, the larger Lysithea reaching an apex in her transformation, and through the sweet release tightening her vice like grip around little Byleth.
THe memories rushed more chaotically now, Byleth’s history as a teacher being buried by the anxieties and expectations of Lysithea’s life, as well as the inspiration she felt every time she gazed upon her teacher Byleth. But what also came was a swell of confidence. She was confident in her abilities, damn confident, and her teacher smothering her with this sort of affection surely was a sign that she was being recognized. She was deemed worthy by the woman she thought of as a goddess! All that said, this was so embarrassing, to be reduced to such a helpless state.
Little Byleth’s worries began to fade away though once one of her teacher’s hands cradled the back of her head, gently massaging her scalp as she reeled from orgasm. Little Byleth’s face contorted and trembled, as if big Byleth’s love was pouring straight into her, creating the very visage of her own affections. Little Byleth submitted to the sensation, Lysithea’s face and desires consuming her old one. Her loins were wet with envy over the goddess holding her as she rode her thigh that she was sat upon.
“Lysitheia darling! We’re almost there! AlmooOOOHH YESSS~!!”
The new Byleth felt her own face shifting, the transfer reaching its completion as the faces of both women flowed into the other upon the waves of a joint orgasm. Byleth’s folds dripped all over Lysithe’s clinging legs, while Lysithea’s spilled all over the firm, clenched thigh of Byleth’s. Moans of every kind filled the empty classroom, a symphony of union between the two, their hearts beating in unison.
After what felt like an eternity, Byleth released her hold on her student, the new Lysithea falling limp into one of her teacher’s arms helping prop her up. Her arms dangled and twitched, her face in a fog as she panted heavily, hair drenched in sweat. Byleth cooed and began to rub at her toned legs. Her body truly matched her abilities now. She was perfect.
As Lysithea began coming to, Byleth sat her up on the desk and moved in close to her face. Right as her student’s eyes began to hone in on the beauty in front of her, she then planted a kiss on her. Lysithea’s face immediately went flushed and she recoiled.
“Miss Byleth please! That is most unbecoming of a place like this!”
Lysithea shook her head, her thoughts a jumbled mess.
“What in the world happened to us?”
Byleth crossed her arms and smugly smiled, an expression that’d look out of place on her face to anyone familiar with her.
“Something wonderful my student. I’ve been given the body and position I rightfully deserve. Mmm, and you’ve been given one that will allow you a reprieve from all your worries and responsibilities.”
Lysithea gritted her teeth for a moment, then huffed.
“No, no! This isn’t right. I-I, gh, I have too much on my plate as heir to House Ordelia. I can’t just, no wait… ugh! This is so confusing…”
Byleth leaned in and put a hand under her student’s chin, raising her gaze towards hers.
“Don’t worry, my dear Lysithea. You needn’t worry anymore. I’ll take good care of you~.”
***
Lysithea, the new Lysithea, wandered the halls of the academy, slowly making her way to the office where her frustrating hottie of a teacher Byleth was shacked up after a long day of teaching. That needy woman was summoning her on the regular ever since they had swapped bodies almost a month ago. What had started as a bunch of bickering over finding a way to change back, pushed mostly from Lysithea’s end, had now settled into a sort of couple’s affair.
It was exacerbating, Lysithea feeling further away from her old self as Byleth every day. New Byleth was living it up in her old body, flaunting it more shamefully than she ever had herself, as if she were intent on seducing her students. She also appeared too happy in her new position as a teacher to ever entertain going back to how things were, the smug look on her face every time the two met up infuriating her. And yet…
Lysithea clutched one of her arms and bit her lip, a bit of warmth stirring in her nethers. As much as she loathed to admit it, she was turned on by it all. After inheriting all of her old student’s memories, she had grown far more emotive, and thus responsive to the affection old Lysithea held towards Byleth. Her student’s crush and position within the academy was now hers’ and she was still grappling with how to process all of it. After so many weeks, she hardly felt like herself anymore, old memories growing more fuzzy and less prominent after each heated interaction with Miss Byleth.
Upon finally reaching the door, her heart fluttering as she imagined getting a kiss from her beloved teacher, she attempted with all her might to firm up. Today would be the day she stood her ground and forced Miss Byleth to help her fix things. However, such thoughts wilted as fast as they had sprouted upon hearing the muffled moans coming from beyond the door.
Cracking open the door a smidge, Lysithea peered through to find her horndog of a teacher masturbating in front of a mirror, making out with her own reflection. She was wearing one of her racy corsets. The woman had truly been mindful to show off as much of her body as was deemed tolerable, rubbing how proud she was of it in everyone’s faces. But to do this as well? Was there truly no limits to her vanity?
Unfortunately, Lysithea’s disgust only went so far. Her true feelings had already seized control of her body, one hand dug into her jeans and rubbing at her folds.
“D-Damn you Miss Byleth… Ooooh~.”
The two women found a shared rhythm eventually, as if it were a testament to their linked souls. Each of their swelling swaths of molten bliss were rising in unison, each one biting their lip as they felt the walls about to be breached. They both tensed up, unable to hold back moans as liberation finally came. Lysithea in particular had been quite loud, which in turn caught the attention of Miss Byleth post orgasm.
The door sheltering Lysithea flung open and she hopped in fright, taking several steps back before trying to recollect herself and shake it off as if she hadn’t been startled at all.
“Ahem, M-Miss Byleth! Are you sure partaking in such actions so flippantly on school grounds is acceptable? I-I could have you reported, you know!”
Byleth didn’t buy the act at all, the wet stain on her students pants another obvious sign to what had transpired. It was to be expected, as far as she was concerned. The two had already fucked a few times already, Lysithea’s abrasiveness towards her and their situation just how she coped with things. It was obvious she loved her new life just as much as she did.
A playful smile crossed Byleth’s face as she grabbed hold of her precious Lysithea’s arm and reeled her in close. Her student’s stuffy demeanor was trying so hard to hold steady only inches away from her face.
“Now, now Lysithea dear. You and I both know that what goes on in the privacy of this office stays in the office no? Or would you like it if I revealed all the salacious acts you yourself have committed within these walls?”
Lysithea immediately became flustered and led her teacher in step into the privacy of the office and slammed the door behind her.
“W-Why you.. AUGH! Why must you be so difficult!?”
Byleth merely smiled over the sight of her cute student all gassed up.
“My cute student. You don’t need to hold back around me. Just be yourself~.”
Lysithea gripped her head, confusion, frustration, and temptation all battering around inside her head to create the cocktail of a pent-up woman she had become. Once she simmered out, she gave merely a sigh, and approached the woman of her torment.
Staring Miss Byleth straight in her eyes she said, “Just do me already.”
Her teacher briefly patted her on the head before moving to caress one of her cheeks. The two then went in for a kiss, the bickering from before already another memory worth forgetting.
