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Byleth was awoken from her sleep by a quake that nearly launched her from her bed. Scrambling upright in a sudden frenzy, her brain raced trying to analyze the situation to the best of her abilities. Years of instinct built up from mercenary work kicked back into overdrive- the windows were all closed, as was her door. She was in her room, nothing belonging to her was missing at a glance, she was in a good position to act. It would be hard to fight in her pajamas but she would have to make do. The split-second assessment gave her enough confidence to hop out of bed and dart for her table, grabbing the nearest sword of the four she'd insisted on stockpiling and sprinting for the door. She hadn't even stepped outside when the ground shook again, buckling beneath her and sending her facefirst into the floor. The sheathed sword tumbled a few feet away.
It sounded like thunder, but that level of force was closer to something like Meteor. Where the hell was it? Looking around, it was still just daybreak and the sky was clear. She didn't smell any smoke...
Stumbling to her feet and grabbing her sword again, Byleth weighed her options. If it was something like an attack by mages, she needed to not be somewhere where the roof could fall on her. If she went outside, though, she might be walking right in front of archers...
...and it was then, riding that train of thought, that Sothis’ echoing “ahem” rang through her head, ripping her from her hypercombative fight-or-flight to remember where exactly she was. She lowered her shoulders slightly and nodded- if it was a bad idea, she could just rewind.
As she ran south from her dorm, a creeping dread continued to build in her chest. Something about this wasn't right. The air wasn't carrying the scent of anything dangerous and nobody had come to wake her up, she was almost wholly alone as the only person awake right now. It was entirely possible that she was just the fastest-rising in the Monastery, she mused as she sprinted at a speed that might have truly been enough to outpace an arrow, but was she that fast?
A third rumble nearly sent her to the ground again just as she rounded the corner. It was a lot less intense than the previous two, but still cause for obvious concern. Even the market was largely empty, with just a single guard by the Academy’s door saluting Byleth as she raced into view.
“You!” She pointed at him and shouted in a way wholly uncharacteristic of herself. “What’s going on?!”
“Professor!” The gatekeeper shouted back, trying his best to smile but only really seeming to make his mouth twitch a little. “Nothing to repo--”
“You know as well as I do that’s a lie, what’s that rumbling?! Are we under attack? Where is everyone?!”
The gatekeeper flinched a little and shook his head. “Everyone else is asleep, Professor! Except for... well, uh, as for the rumbling...” He shrugged and gestured his spear off to his left, towards the stables.
Byleth whipped her head to follow where he was pointing and squinted. Everything seemed to be normal over there, but just then--
BOOM!
-another rumble, and she saw something rise past a rooftop. It looked massive and distinctly stonelike, but before she could figure out what it was, it disappeared back behind the building. She looked back at the guard, then at the building, then back and forth between them a few more times before sighing and running off, leaving a swirl of wind whipping behind her. She would’ve asked why he wasn’t doing anything about it, but she knew as well as he did that he wouldn’t be able to do much at all.
Her approach was trepidatious, for as fast as it was, and Byleth kept thinking about what she’d have to do once she got there. The most obvious plan of action would be to assess the situation to the best of her ability, then rewind and find somebody else to help. Who would she get, though? Would anyone be up fast enough before this thing became a serious issue?
She’d have to think about that later- earlier?- though. Skidding to a stop, Byleth finally beheld the source of the rumbling and her mile-a-minute mind ground to a halt.
A towering figure as tall as the stables themselves loomed above her like some ancient titan or deity (such a comparison causing an audible eye-roll from Sothis, naturally.) Almost 20 meters high, it was easily more than half that broad in turn, with immense shoulders and arms that would be able to hold an oak tree like a weapon. Its back was a tapestry of overwrought musculature that nearly blotted its entire head from rear view, leaving only the very tip of its brown-haired scalp and a few thick, wavy sheets of its tremendously long mane flowing down behind it. In its hand it held what seemed to be a ripped-up chunk of masonry, which it raised and lowered in rhythmic fashion. The biceps on those arms bulged high, flexing almost twice their relaxed size before shrinking back down to a size just a bit bigger than they’d been before. It was growing actively..?
Beneath the looming upper body, the figure’s waist slimmed downwards considerably- not losing any muscle in the process- before the hips bloomed and thighs bulged with just as much fervor as the arms. Every inch of this thing was a monument of power, valleys and peaks of muscle so immense that Byleth worried she would just get her sword caught between them if she swung at it. Her eyes darted all over it to try and see if any part of this monstrosity showed any sign of weakness, before suddenly--
“Oh, Professor!”
--she heard Hilda’s voice. The same upbeat, casual tone she always had. It jarred her out of her panic and drew her attention towards...
...towards her. Beside the looming titan, leaning up against the wall, was what she could only describe as a caricature of Hilda modeled after the people she’d trounced in battle. A three-meter behemoth of a woman relaxing casually, her typical curvy figure now bulked up into something that defied human limitation entirely. She rested her arms behind her head- arms wider than Byleth’s torso, easily- and winked at her when she looked over, tilting her head to the side to push her cheek into her shoulder muscle. Her bust jutted out from her chest like a pair of balloons, each one ridiculously perky from the support of her pectorals, capped with nipples larger than her fists. Her body was still shapely, Byleth realized as she looked further down, taking in the tremendous breadth of her toned ass and wide hips, her glutes gently flexing into view beneath a heavy layer of pert assfat before disappearing beneath it like a whale returning under the waves.
“Enjoying the view?” Hilda narrowed her eyes and smirked. “I mean, I don’t blame you, but like... you’ve seen her, right? I’m touched!”
She jerked a thumb towards the titan- titaness?- and turned to look at her. “Oi, Dorothea!~ Our Professor’s interested in your progress!”
“D--” Byleth’s voice caught in her throat as she saw the behemoth shift on her feet, the ground shaking in just as much awe for her might as she felt in that moment. Around she turned, bringing into view a pair of similarly impossibly-perky breasts that cast Byleth in complete shadow as they became a ceiling above her head. She felt her vision go blurry as the weight of that name hit her--
CRRRK.
That impossibly hypermuscular chest flexed slightly, letting her tits part enough for a head amidst a sea of muscle to become visible. Even Byleth’s confusion-addled mind recognized her immediately.
“Dorothea?! Wh-- hah--?”
Dorothea blushed a little and smiled down at her, trying her best to wave despite the immense bulk of her arm.
“Hello, Professor..! I, uhm, apologize for the scare you must’ve felt, but...” She laughed, and the air boomed in time with her. “...well, you said during yesterday’s classes that I should focus more on my swordwork, and I was thinking- well, I’m not exactly the most physically capable, but maybe...” She gestured her head towards Hilda, her neck muscles creaking audibly with every movement. “...I could find someone to help! So, y’know...”
Hilda grinned and pushed off from the wall. “She came to me- ‘oh, Hildie, I wanna learn how you got so strong!’ And you know me...”
“I didn’t sound like that!” Dorothea pouted, contrasting her brutal sea of muscle with an utterly adorable face. “I asked you very plainly and evenly if you wanted to spend the evening training!”
Hilda shrugged with a laugh. Byleth’s brain bounced around, struggling to keep up with the sight and sound and feeling of it all before it suddenly ground to a halt.
“...You asked Hilda?” Byleth said hoarsely, air struggling to re-enter her lungs as she breathed.
It was the other muscletitaness’ turn to pout. “Hey! What’s that supposed to mean?!”
Byleth looked over at her and shook her head. “I just-- you’re the last person I’d expect someone to go to for tutoring...”
Dorothea laughed again, sending the two much smaller women stumbling in the process. “I suppose so, but who else would have helped this much? I mean, I wasn’t going to ask any of the boys to spend the night working out, was I?”
Hilda put her hands on her bulky hips and rolled her eyes annoyedly. “I think Sylvain would’ve died on the spot if you did.”
The two snickered under their breath, and Byleth felt her body relax. Okay, so at the very least, the sudden growth hadn’t messed their brains up. But on that topic...
“Right, so... Hilda, what happened?”
The shrug she got in response was equally puzzling and beautiful. Something about the way Hilda’s body flexed caught her attention no matter what, beholding the sheer immaculacy of how every muscle shifted and stretched like it were a work of priceless art. Byleth blinked and shook her head.
“Beats me.” Hilda said bluntly. “I mean, I’ve worked out before, but not like this. I think there might’ve been something in the food yesterday...”
She thought back to yesterday- to dinner, to the cooking she’d done with Bernadetta, to the ingredients and to the... oddly shimmering... fish she’d... pulled from the... riv...er...
“I.. see.” She said, trying to tamp back the dawning worry in the back of her mind. “But why did it affect Dorothea so much more than..?”
Dorothea smiled confidently and stood back up straight, raising both arms up high to suddenly and proudly flex, her arms bulging outwards until the peaks of her bi-and-triceps seemed to reach past her head and towards her hips, respectively. The shockwave made Byleth reel back and topple onto her ass with a loud shout, staring up from the floor at the way Dorothea’s veins bulged beneath her skin, the perfect shifting and flexing of her innumerable abs, the sweeping curve of her lats- every muscle that one could name was driven to its absolute limits on her figure, and despite all of it all Byleth could use to describe the girl was gorgeous. She felt that, on anyone else, it would be horrifying, but the sight of the divinely-empowered songstress just made her gape with awe.
“Is it really so out there that I was just naturally this capable, Professor?” She mused in a lower tone than Byleth had ever heard from her before, letting her muscles relax and retract back into a (comparatively) more manageable size. Her voice rose up from baritone to soprano over the course of her speaking, a display of control over parts of her body that Byleth didn’t even know could be controlled that precisely. “That Miss Arnault had this potential beneath her surface all along and just needed a bit of prodding to get it out?”
She didn’t respond, too stunned with her immensity and power to form a coherent thought. Hilda sauntered up next to her with a smug smile and leaned in, heaving round breasts swinging just an inch from Byleth’s face before she reached out and lifted her up from the ground. Being wedged between those boulders of tit completely blanked the poor girl, to Hilda’s amusement as she hefted her up without using her arms at all, merely flexing her tits together to keep Byleth pinned between them while she walked back over to Dorothea.
“I think our Professor is a fan of our improvements, Dorothea, even if she can’t show it yet!~” She said adorably, winking down at the poor brainfried girl before her. “If I had to guess, she thinks you’ll be Garreg Mach’s greatest alumni ever, now and prooobably forever after!~”
Dorothea chuckled warmly, reaching down in a heaving cacophony of creaking muscle and rumbling stone to proffer her hand beneath Hilda’s boulder breasts. She relaxes her chest and lets Byleth drop into her palm, and before she can react she’s pinned against it by g-forces as she’s lifted back up to eye level with what she still struggled to process was the same girl she’d spoken to in class just twelve hours prior. Pulling her over a sea of muscle and dropping her atop her stone-hard pectorals, Dorothea wastes no time leaning in to kiss Byleth on the forehead.
“Thank you, again, for giving me the motivation to follow through with this. Can you imagine if I’d gone my whole life never knowing?~ I guess it’s true what they say, that a professor’s job is to inspire their pupils to grow into their best selves...”
Her eyes rolled up as she finally relented to the force of Dorothea’s personality, and Byleth slumped down into her chest, sliding back deliriously towards her cleavage. As she felt the two boobmountains squeeze in around her and shuffled a little deeper, she heard another chuckle, another warm sigh...
“I’ll let you know when I’m done. Ready for the fourth set, Hilda?”
She heard muscles as large as her body flexing loudly. She felt the rumble of groaning, growing bodies continuing to ascend to greater levels of divine might. And Byleth smiled, delirious and overjoyed, that her work had borne such immaculate fruit.