Transformation Roulette (Rias/Akeno Weird TF)

This is a 2am Story, that means the quality might not be as high as you are used to from me. Full info about 2am Stories here.

Futa warning

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The moment was sudden.

One second, Rias and Akeno were relaxing in the clubroom of the Occult Research Club, sipping tea and chatting about the day’s events. The next—FLASH!—they were no longer in their familiar, comfortable surroundings.

Instead, they found themselves standing beneath the glare of bright, multicolored spotlights, the hum of unseen machinery filling the air. The floor beneath them was smooth and polished, reflecting the shimmering gold and red décor of the vast game show stage.

A massive spinning wheel loomed in front of them, covered in bold, flashing text, each section labeled with a number. Next to it stood a long table lined with glowing vials, their contents swirling with an unnatural luminescence, each of them also labeled with the same types of numbers.

And in the center of it all stood a woman. Tall, white hair covering one eye, a stunning white dress that hugged her every curve, and an expression that could only be described as mischievous delight.

With a dramatic flourish, she raised her arms and grinned.

“Welcome, ladies, to the most exciting game show you never signed up for—TRANSFORMATION ROULETTE!”

Rias blinked. Then blinked again.

Akeno, on the other hand, simply smirked.

“Alright, you lost me.” Rias sighed, looking around in confusion. “What is this? Who are you? And why are we here? If you don't mind me asking of course.”

The hostess let out a musical laugh, twirling a strand of her silky hair between her fingers. “Ahh, questions, questions! You’re here because fate has chosen you, my dear! As for me…” She placed a hand on her chest. “I am Wan-Ting, the host of this spectacular show! And the rules are very simple.”

With an elegant gesture, she pointed to the massive wheel behind them.

“You see that? That is the Transformation Roulette Wheel. You two lovely contestants will take turns spinning it, and whatever potion it lands on…” she trailed off, dramatically gesturing toward the glowing vials on the table, “…you drink it.”

A smile crept onto Rias’ face when she heard that, though her tone remained sceptical. “And what exactly happens after we drink it?”

Wan-Ting clapped her hands together, beaming. “Why, you transform, of course! The potion will alter you in some way, and I will be here to lovingly explain exactly what’s happening to you, in real time!”

Akeno let out a small giggle, clearly enjoying Rias’s increasing distress. “Mmm… transformation, huh?” She tilted her head. “That does sound interesting.”

Rias shot her a look. “Akeno. Don’t indulge too much, okay?”

Akeno merely smiled, but there was a teasing glint in her eyes.

“So what kind of transformations are we dealing with?” Akeno asked, her voice dripping with amusement.

Wan-Ting’s eyes sparkled with excitement. “I thought you’d never ask!” She turned toward the table of potions, sweeping her arm over them as if presenting a grand feast.

She gestured to the first vial, a pink, swirling liquid that practically radiated softness.

“First up, Boob Expansion! As you might expect, drinking this will significantly enhance your assets!”

Next, she pointed to a deep blue vial, the liquid within thick and heavy.

“Then we have Ass Expansion! Because sometimes, a little more cushion is just what you need.”

She was about to continue down the line, her tone growing increasingly gleeful, when she suddenly stopped to think. Wan-Ting clasped her hands together. “But I think I am going to keep the rest a secret. A delightful selection, wouldn’t you say?”

Rias’s hand was already on her face. “...who chose those potions? Issei?”

Akeno, meanwhile, let out a delighted laugh. “Ara ara~ These all sound so… perverted.”

Wan-Ting grinned. “That’s the best part!”

“I'm just asking to make sure…” Rias asked, looking up at the woman in a white lab coat. “You won’t let us go without playing, will you?”

“Nope~ You will have to stay here till the shows over~” Wan-Ting explained, to which Akeno giggled. 

Rias rolled her eyes, then pressed a hand to her forehead. “We’re really doing this, aren’t we?”

“Oh, absolutely!” Wan-Ting clapped her hands. “And speaking of which—it’s time for our first spin!”

She pointed directly at Rias.

“Rias, you’re up first!”

Rias sighed again.

“Any reason why I have to go first?” she retorted, not happy about the situation.

Wan-Ting gave her an innocent look. “Because I said so.”

Akeno placed a hand on Rias’s back, gently nudging her forward. “Come on, Rias~ It’s just a little spin. Let's have a little perverted fun together. It's been so long since we did something like that. Hehehe…”

Rias shot her a glare. Akeno was waaay too into this. Whatever. 

Still, she realized she had no choice anyway. With a resigned sigh, she stepped up to the massive roulette wheel.

The sections of the wheel were boldly marked with a number, each corresponding with a potion that the roulette pretty boldly pointed to. With numbers as well as with a glow that made the potion and wheelsegment shine together.

Taking a deep breath, Rias grabbed the handle and spun it hard.

The wheel clattered loudly, the sections blurring together in a whirlwind of colors.

Wan-Ting beamed. “Ohh, the anticipation! What will it be?”

Akeno leaned forward, watching intently. “I can’t wait to see if that thing really works~”

Rias just rolled her eyes. “...you are way too into this Akeno…”

The clacking grew softer…

Slower…

Until finally, it came to a stop.

Rias looked at the result.

It was a 1. 

Her eyes widened. Rias didn’t know what like six out of the eight potions would do, but she had a very grim feeling that she knew what number 1 was.

Wan-Ting grinned.

“Ooooh~ Going with the first one immediately? Alrighty then~”

Rias gulped.

“Go on, dear,” Wan-Ting said, handing her the glowing vial. “Drink up.”

Rias stared at the glowing pink vial in her hand.

She didn’t want to drink it. Every instinct screamed that this was a terrible idea, but Wan-Ting stood there with an expectant grin, and Akeno was watching her with barely contained excitement.

Rias let out a heavy sigh.

"Fine…" she muttered.

With one swift motion, she lifted the vial to her lips and drank it all in one go.

The liquid was warm, thicker than water, and had a sweet, almost creamy taste. For a moment, nothing happened.

Then—

A sudden heat bloomed in her chest.

It was subtle at first, a pleasant warmth spreading through her body. But within seconds, that warmth intensified, turning into a strange, swelling pressure centered around her breasts.

Rias gasped, looking down just in time to see her chest push forward ever so slightly.

“…Oh no. I figured as much…”

Before she could process it, her breasts began to grow.

It started slowly, her already generous assets gently pushing outward, her top tightening just a bit more than it should. But then—

They surged.

Her lace-trimmed top strained dangerously, the fabric creaking as her breasts swelled bigger and bigger. The soft curve of her cleavage pushed forward in her view, her chest growing heavier by the second.

“Wh-what—?!” Rias staggered, feeling the extra weight pulling her forward.

Her breasts ballooned, rounding out rapidly, growing larger than basketballs within seconds. Her bra was practically useless, her outfit struggling to keep up with the overwhelming expansion.

Akeno clapped her hands together, delighted. “Oh my~! Rias, you’re getting huge!”

Rias gritted her teeth. “They are big enough! Make it stop—!”

But the potion wasn’t done yet.

The growth accelerated, her already ridiculous bust expanding even further.

Basketballs turned into beach balls.

Her cleavage dominated her entire torso, her growing assets pushing against her arms, her top stretching past its limits as it barely contained the massive, jiggling orbs.

Then—

Her breasts swelled even bigger.

Each mound became medicinball-sized, and still, the potion kept going, her once-proud posture forced to adjust to the insane weight pulling her forward.

Just when Rias thought it couldn’t get worse—

Her chest grew even further, each breast swelling to nearly four times the size of her head, completely overshadowing the rest of her body.

Her entire upper half was now dominated by her absurdly huge, impossibly soft, wobbling chest.

It was then that Wan-Ting finally decided to speak.

“Ohoho! Well, congratulations, Rias~” she chimed, placing a hand on her hip. “You’ve just experienced the wonders of Boob Expansion! One of our most beloved transformations!”

Rias’s nodded in defeat. “Oh really? I’m sure I couldn't have figured that one out without your help, chief…”

Wan-Ting nodded eagerly. “Oh, absolutely! And what a dose you got! Look at that size! Your bust is truly magnificent now—practically a work of art!”

Rias let out a frustrated groan, trying to adjust her balance as she struggled to move.

“Work of art goes a bit far!” she retorted, trying to get them to stop wobbling. “They look more like weapons of mass destruction than breasts.”

Wan-Ting laughed. “Oh, you’ll get used to it! Besides, wouldn’t you say this is an improvement? You have always been blessed, but you have to admit that your curves have never been THIS generous!”

Rias shot her a look so venomous that Wan-Ting only grinned harder. To which Rias gave off a defeated sigh.

Akeno, meanwhile, circled around Rias, admiring the sheer excess of her expanded assets.

“Oh my, Rias~” she purred. “You’re so… big~ I bet Issei will love this. May I…?”

Rias glared at her for a moment. “Akeno. Don’t.”

“Ara ara~” Akeno giggled because Rias didn’t deny it.

Rias groaned, still feeling overwhelmed by the massive, wobbling weight of her new assets.

“Please tell me this wears off…” she muttered.

Wan-Ting merely gave her a mystical, knowing smile.

“…No promises~”

“Well, that was certainly entertaining,” Akeno stood nearby, a playful smile on her lips, eyeing Rias’s enormous new proportions. “But I suppose it’s my turn now, isn’t it?”

Wan-Ting clapped her hands together, delighted.

“That’s the spirit! Step right up and give that wheel a good spin!”

Akeno sauntered forward, reaching for the roulette wheel’s handle. With a confident flick of her wrist, she sent the wheel spinning, the sections blurring together in a whirlwind of flashing colors.

Clack. Clack. Clack.

Rias, still struggling with her overgrown chest, shot Akeno a smirk. “You know I usually don’t bet against you, but right now I am sooo hoping that you’ll get something just as bad as this,” she muttered.

Akeno simply chuckled, her eyes fixed on the spinning wheel.

Then—

The wheel slowed, the pointer clacking through its final stops until it landed firmly on a 5.

Akeno’s eyebrows lifted.

Wan-Ting let out an excited gasp.

“Ooooh~ This one’s going to be so much fun!”

A vial on the potion table glowed brightly, its contents swirling with a thick, golden liquid. Wan-Ting gracefully lifted it and handed it to Akeno.

“Drink up, dear! No hesitations now.”

Akeno took the vial, rolling it between her fingers. “Hmm… Well, if Rias could handle her potion, I suppose I shouldn’t be afraid either.”

With a playful smirk, she lifted the vial to her lips and drank it all in one go.

The liquid was smooth and heavy, almost like warm honey. Akeno licked her lips as she lowered the vial, waiting for the effects to kick in.

For a moment, nothing happened.

Then—

A deep warmth spread through her body, pooling right in her midsection.

Akeno’s eyes widened slightly, bringing a hand to her stomach as she felt a strange pressure start to build.

“…Oh my,” she murmured.

She looked down just in time to see her slim waist start to round out.

At first, it was gentle—her stomach softening, her once-flat midsection beginning to push outward into a plump curve.

But the growth didn’t stop there.

Her belly expanded, rounding out as her toned figure vanished beneath soft, growing flesh.

Her dress stretched, the material creaking as her midsection ballooned outward in front of her.

Rias, watching with wide eyes, snickered.

“Oh now this is satisfying,” she said, crossing her arms (or trying to, given the sheer size of her new chest).

Akeno let out a small hum of amusement, placing her hands on her rapidly expanding stomach, feeling its weight pulling forward.

“…It’s certainly a different sensation,” she mused.

Then—

Wan-Ting finally spoke.

“Congratulations, Akeno!” Wan-Ting announced, her voice filled with pure glee. “You’ve just experienced the Fat Round Belly potion! One of my absolute favorites!”

Akeno blinked. “Ara~?”

Wan-Ting nodded enthusiastically.

“Oh yes! This delightful concoction instantly blesses you with a soft, heavy, round belly—a perfect symbol of luxury and indulgence! Just look at how plush and full you’re getting!”

Akeno’s eyes widened slightly as she felt another surge of warmth, and suddenly—

Her belly expanded even faster.

What had once been a modest curve now grew dramatically, ballooning outward as her belly swelled into a massive, heavy mound.

The sheer size of it pushed her posture slightly backward, forcing her to shift her stance to accommodate the increasing weight.

Her soft stomach jiggled slightly with each movement, and the pressure of the growth intensified, stretching her dress to its absolute limit.

Her once-taut waist had vanished, replaced by a large, round belly that made her look as though she’d indulged in an entire feast… or ten.

Akeno’s cheeks flushed, feeling the sheer weight and softness of her new form.

“Oh my~” she murmured, placing her hands on the enormous curve of her midsection.

Wan-Ting giggled gleefully. “See? Isn’t it wonderful? A true symbol of plush femininity! So soft, so full, so inviting~!”

Akeno gave her a half-lidded stare. “Inviting?”

Wan-Ting winked. “Oh, absolutely! I mean, just look at how perfectly round and jiggly it is! Doesn’t it just make you want to hug it?”

Rias, still recovering from her own massive chest expansion, let out a wheezy laugh.

“Oh, I don’t know, Akeno,” she teased. “Who do you think got the worse deal here?”

Akeno glanced down, running her hands over the sheer massive size of her round belly, before flicking her gaze toward Rias’s colossal chest.

She hummed thoughtfully.

“…It’s hard to say.”

“You know, I know which one I wouldn’t wanna have, and it's not the breasts…” Rias declared, although still adjusting to the weight of her massive chest, which was far larger than it had any right to be after her first potion. She then turned to Wan-Ting, who was far too amused by the results so far.

“Alright, we drank one each. Can we go now?” Rias asked, gesturing at her massive mammeries.

Wan-Ting beamed. “Oh, nonsense! The show must go on until all potions are gone! And it’s your turn again, Rias!”

“Ara~ It was worth a try~” Akeno, still smoothing her hands over her own enormous belly, chuckled. “In this case, I can’t wait to see what happens this time~”

Rias groaned, but shrugged as she had no choice.

Shifting her weight to compensate for her absurdly oversized bust, she stepped forward to the roulette wheel once more.

She grabbed the handle, took a deep breath, and spun it hard.

The wheel clattered loudly, the colors blurring together as it spun at a dizzying speed.

Clack. Clack. Clack.

Everyone watched as the wheel began to slow.

Clack… clack… clack…

Finally, it stopped.

The glowing section lit up, and Wan-Ting’s eyes sparkled with delight.

“Ooooh~ This one’s a real favorite!”

A nearby potion bottle shimmered, the liquid inside a strange, glossy pink that seemed to ripple like living silk.

Wan-Ting handed it to Rias with a knowing grin.

“Bottoms up, dear!”

Rias hesitated, eyeing the vial suspiciously. But she knew there was no escape.

With a resigned sigh, she lifted the potion to her lips and drank it down in one gulp.

The moment the liquid slid down her throat, it felt strange.

It wasn’t warm like the last potion. Instead, it was slick, tingling, almost like a cool breeze was spreading through her chest.

Rias shuddered, pressing a hand against her breasts, expecting them to grow bigger again. But… something was different.

Then—

A sudden, unfamiliar pressure built up right at the center of her breasts.

“…What now?” Rias muttered.

She looked down and—

Her cleavage shifted.

Her skin moved.

And then—

A shape began to form.

“Ahhh~! Now this is a delight!” Wan-Ting clasped her hands together. “Rias, my dear, you’ve just experienced the wonders of the Lipples Potion!”

Rias froze. “…The what?”

Wan-Ting beamed.

“The Lipples Potion! A truly unique little brew! Instead of ordinary, boring nipples—” she gestured dramatically toward Rias’s chest, “—you now have something much, much better.”

Rias looked down and—

Her eyes went wide.

Her breasts twitched.

Then, with an unsettling ripple, two perfectly formed mouths suddenly pushed forward where her nipples should have been.

“…Oh HELL NO.”

Each mouth was full, plump, and undeniably expressive, complete with soft, thick lips that smacked together as if testing themselves.

Each mouth had its own tongue, flicking out for a moment before retreating.

And then—

They moved.

“Ohhh, it’s so warm out here!” one of them spoke, its voice perfectly sultry yet completely independent of Rias’s own.

“Mmm, fresh air!” the other one purred, lips smacking together as if savoring the moment.

Rias stood there, frozen, her face as red as her hair.

Akeno gasped, covering her mouth in shock—before immediately bursting into laughter.

“Ara~ My oh my, Rias— Are you’re TALKING through your—!”

“SHUT UP!” Rias snapped—except it wasn’t just her own voice.

The mouths on her chest also shouted along with her, their plump lips moving perfectly in sync.

She attempted to clamp her hands over them, trying to silence them. But due to her breast size that proved to be nearly impossible, and even if it wasn't, they were several times bigger than her palms anyway. 

Wan-Ting squealed with delight.

“Oh, I love this one! Such a charming addition! Look at how expressive they are!”

Then—another wave of the potion’s magic surged through her.

Rias gasped, feeling her new mouths plump up even more, their lips becoming thicker, softer, and even more sensitive.

Each one let out a contented sigh, their tongues lazily flicking out to wet their now excessively plush lips.

“Ohhhh~ This feels so nice~” one of them moaned.

The other chuckled seductively. “Mmm, such soft, pillowy goodness~!”

Rias trembled, her entire body overheating from pure secondhand embarrassment.

“Okay, this has to stop! And this has to stop now!”

Wan-Ting simply shook her head, grinning ear to ear.

“Oh, Rias, dear, why would you ever want to stop this? You now have the most luxurious, expressive chest in the world!”

Rias glared daggers at her. “YOU TRY HAVING A CHEST THAT TALKS ON ITS OWN AND THEN WE SPEAK AGAIN!”

Akeno, still dying of laughter, wiped a tear from her eye.

“Oh my gods, this is the best thing I’ve ever seen.”

Wan-Ting looked back at Rias a bit concerned. “On its own? Meaning you can’t control them?”

Rias, meanwhile, was too busy trying to hold her chest still, as the two new mouths continued to murmur to themselves, sucking their own lips, licking the air, and occasionally throwing out random sultry comments.

“This is so soft~”

“Akeno's belly sure is round~”

“Ugggghhhh!” Rias groaned again as she looks at Wan-Ting. “Yes, they just talk. This isn't me.”

“Interesting! My, my, I don’t remember the potion doing that before!” Wan-Ting replied, looking a little bit surprised herself. “This is definitely an unintended side effect.”

Akeno laughed even harder. “Oh, this is beyond perfect. Keep them that way, they are perfect~”

“Thanks.” Rias replied deadpan. 

As if to drive the point home, one of her lipple mouths suddenly licked its own thick lips, then murmured, “Mmm~ I could just kiss something right now…~”

Rias slapped her own boobs for the first time in her life. “No you don’t.”

Wan-Ting hummed in amusement. “Hmm… So yeah, this is an unexpected side effect. Perhaps I should do something about it~”

Rias whipped her head toward her, this time with a bit of hope. “Yes, please. Can you reverse it?”

Wan-Ting simply smiled, plucking a small, shimmering blue potion from her pocket.

“Well, lucky for you, I do have something! This little number should allow you to fully control your lipples, rendering them completely obedient to your will! Reversing it would be against the show's rules, but I can at least offer you this much.”

Rias snatched it out of her hands without a second thought. She didn’t even ask if there were side effects. She just chugged it. Yes, she disliked her talking nipples that much.

The moment she drank the potion, a wave of clarity washed over her.

The constant moaning and murmuring from her chest stopped instantly.

Her lipple mouths fell silent, their thick, plush lips parting slightly, but they no longer acted on their own.

Rias exhaled deeply, relief flooding through her.

“…Oh, thank goodness,” she muttered.

She focused, and sure enough, she could feel total control over them now.

She experimentally willed one to open its mouth, then close it.

She flicked the tongue inside, testing her new control.

Everything responded perfectly.

“…Okay. Okay, this is good.”

She looked at Wan-Ting with suspicion. “And there’s no catch, right?”

Wan-Ting giggled. “Oh, none at all! You now have full control over them! In fact, it should be so natural that you won’t even be able to tell the difference~”

“…Wait. What?”

It was too late.

Rias opened her mouth to speak again—

But this time, the voice came from her right lipple.

“…Hold on.”

Her eyes widened.

She tried again.

“This is—”

This time, the voice came from her left lipple.

Rias froze.

“…No. No, no, no—”

She clenched her jaw, forcing herself to speak.

“I can’t tell which—”

Her normal mouth moved.

“I’m talking from.”

Her right lipple moved.

“At any given moment.”

Her left lipple moved.

Rias stopped talking immediately.

Wan-Ting clapped her hands together in delight. “Oh, how adorable! Now all your mouths are completely synchronized with you! Isn’t that wonderful?”

Rias was not amused.

“...So in other words you made it practically impossible for me to control which mouth I am speaking from.”

“Yup.” Wan-Ting nodded.

“You have got to be kidding me.” Said Rias' left lipple. Making her groan from her right. It was such a strange sensation. She really could not tell which mouth she was using before she actually did it. It was also she she immediately forgot again which mouth she used and how she used it after she was done talking, making it essentially random.

Akeno, stunned into silence, finally burst into laughter again.

“Oh my gods, Rias— this is even worse!”

“No it’s not.” Rias said through her regular mouth, which also boosted her confidence. “This is a thousand times better than not controlling them at all.”

“Hey, please don’t hold this against me, but…” Akeno, still recovering, giggled. “Seeing you like this… Ohhh, I love this game.”

Wan-Ting smirked. “Well, dear Rias, I suppose you’ll have to be mindful of where your words come from now~”

Rias just rolled her eyes, knowing exactly that Wan-Ting made that more than impossible for her. 

“Well! Now that our dear Rias has found her voice… or should I say voices~, it’s your turn again, Akeno!”

Akeno smirked. “Mmm, let’s see what I get this time~”

She stepped up to the wheel, rolling her shoulders as if stretching out her still-heavy belly, then gave the handle a firm spin.

The wheel spun rapidly, the labels blurring together into a flurry of color.

Clack. Clack. Clack.

Wan-Ting hummed in anticipation, eyes glinting as the wheel began to slow.

Clack… clack… clack…

Finally, it came to a stop.

A vial on the table lit up, its contents a deep, shimmering gold, swirling like liquid energy.

Wan-Ting grinned widely.

“Ohhh, now this is going to be spectacular~!”

She plucked the potion from the table and handed it to Akeno.

“Drink up, dear~ You’re in for quite the power boost!”

Akeno took the vial, tilting it back and downing the potion in one go.

The instant the potion slid down her throat, a sudden heat erupted through her entire body.

Unlike her last potion—where the warmth pooled mostly in her belly—this one surged through every inch of her, igniting her muscles like a furnace.

Her body tensed as a powerful burn spread through her arms, her legs, her core—every single muscle in her body tightening.

Her clothing stretched, seams straining as she felt herself growing.

Her arms were the first to change—tightening, bulging, expanding with thick cords of muscle.

Her biceps swelled larger than she had ever seen, veins pressing against her skin as her arms grew larger, thicker, stronger by the second.

Her legs followed suit, her thighs thickening massively, the sheer bulk of her quadriceps straining against her skirt.

Akeno let out a huff of exertion, her entire body tingling as her growing physique became heavier and denser.

And still—the changes weren’t done yet.

“Oooooh~! Look at that definition!” Wan-Ting squealed in delight, practically bouncing on her heels.

“Akeno, dear, you’ve just consumed the Super Muscular Potion! This delightful concoction grants you an extraordinary, absolutely jaw-dropping muscular physique!”

Akeno blinked, flexing one massive arm.

“Ara~ …Super Muscular you say?” she mused, testing the weight and density of her newly thickened arms.

Her biceps alone were already huge, but before she could fully process it—

Another wave of heat tore through her, and the real transformation kicked into overdrive.

Her shoulders broadened even further, growing thick and powerful, muscles piling on top of each other with every passing second.

Her arms bulked up massively, her triceps thickening, her forearms expanding, until she had more muscle packed onto her frame than she had ever seen before.

Her legs followed suit, her quads and calves swelling with immense power, making her stance wider and more stable.

Her stomach, however, was a unique case.

While her core hardened, the layer of plush fat from her previous transformation remained—giving her a thick, powerful midsection, where solid muscle rested beneath an unmistakable softness.

Her entire body was now a fusion of raw power and lingering plushness, making her both intimidating and strangely huggable at the same time.

Akeno let out a deep, satisfied exhale, rolling her shoulders as she examined herself.

“…Oh my~” she murmured, flexing her thickened arms.

Wan-Ting let out a delighted gasp.

“Absolutely STUNNING! Look at those arms! Look at those legs! Such power! Such definition!”

She giggled mischievously.

“And yet, that belly! Ohoho~ The perfect blend of strength and softness!”

Rias, watching in absolute disbelief, stared at the sheer mass of muscle Akeno had gained.

“…Okay, I’ll admit,” Rias said slowly, “…that’s actually terrifying.”

Akeno, still testing her new body, flexed one of her biceps, watching it bulge massively.

“Mmm~ I do feel… powerful~” she purred, grinning.

She turned toward Rias then her bisceps.

“…Wanna feel~?”

Rias took a step back. “Absolutely not.”

Wan-Ting clapped her hands. “Oh, Akeno, my dear! You are truly a sight to behold! This incredible blend of muscle and plushness is a masterpiece!”

Akeno chuckled, shifting her weight—her legs thick with raw power, her arms thick enough to lift anything in her path.

She rolled her shoulders, her frame radiating a sense of overwhelming strength.

“…I think I might enjoy this,” she admitted, smirking.

Wan-Ting grinned. “Oh, I knew you’d be the perfect contestant for this~!”

Rias just let out a deep sigh, massaging her temples.

“Earth to Akeno… Hello?” she muttered under her breath of her right boob.

Meanwhile Akeno just stretched out, flexing her absurdly powerful arms.

Wan-Ting grinned expectantly. “Alright, Rias, dear! Let’s keep the fun going~! Step right up and give the wheel a spin!”

Rias groaned, rolling her shoulders.

“…If I get another boob-altering potion, I swear to every deity in existence…” she muttered.

She stepped forward, reached for the wheel, and spun it hard.

The wheel clacked and whirred, the colors blurring together as fate sealed itself once again.

Clack. Clack. Clack.

Akeno, still basking in her newly gained muscular power, flexed one of her massive biceps as she watched, smirking.

“Oh, I can’t wait to see what happens this time~”

Clack… clack… clack…

The wheel slowed.

Rias held her breath.

And then—

It stopped. 

A vial on the potion table lit up, its contents a deep, glowing red, swirling thickly like molten lava.

Wan-Ting clasped her hands together, practically trembling with excitement.

“Ooooh~! Now THIS is a winner!”

She grabbed the potion and handed it to Rias.

“Drink up, dear! This one is an absolute classic!”

Rias stared at the vial, suspicion clear on her face.

“…This isn’t another chest potion, right?”

Wan-Ting smiled. “Ohhh, no no no. It has nothing to do with your chest.”

Rias let out a long sigh of relief.

“Fine,” she muttered.

With no other choice, she lifted the vial and downed it in one go.

The moment the potion slid down her throat, it felt warm and heavy, settling low in her body instead of spreading through her limbs.

Rias’s eyes widened slightly.

“…That’s different.”

Then—

A slow, swelling pressure began to build right in her hips and backside.

She froze.

“…Oh no.”

She could feel it happening—a deep, unrelenting fullness spreading across her hips and buttocks, as if something inside her was filling her up, stretching, expanding.

Her skirt tightened immediately, the fabric creaking under the strain as her curves pushed outward.

Her butt swelled, rounding out bigger and bigger, soft and bouncy, growing in slow, steady pulses.

Rias’s balance shifted slightly, and she let out a small gasp, instinctively grabbing her hips.

Her fingers dug into newly plush, thickening flesh.

“…Oh, come on!”

Akeno, grinning ear to ear, leaned forward, eyes locked on Rias’s expanding backside.

“Oh my gods, Rias, it’s getting huge~”

And still—the growth didn’t stop.

Her hips widened further, her rear swelling larger, her skirt riding up dangerously as her curves dominated more and more space behind her.

Wan-Ting finally spoke.

“Ahhhhh~! Congratulations, Rias! You’ve just consumed the legendary Ass Expansion Potion!”

Rias snapped her head toward her, with a bit of panic.

“…you know you always tell us about that just a tad too late, right?!”

Wan-Ting beamed, seemingly ignoring her completely.

“The Ass Expansion Potion! A potion designed to give you the most plump, perfect, planet-sized posterior the world has ever seen!”

Rias’s facepalmed.

“You’re kidding me—”

Before she could finish, the transformation surged forward again.

A sudden, powerful wave of expansion hit her, making her stagger forward as her buttocks swelled dramatically.

Her hips stretched wider, her rear ballooning into an impossibly round, bouncing, jiggling mass of pure softness.

Her skirt stood no chance.

It lifted completely, exposing her now absurdly large, plush backside, so massive it would have easily crushed a bench if she sat down.

Rias yelped, trying in vain to pull her skirt down, but it was completely useless.

Her newly enormous rear jiggled wildly with the slightest movement, its sheer size and bounce defying all logic.

Wan-Ting squealed in delight.

“Ooooh~! Absolutely MAGNIFICENT! Look at that roundness! Look at that bounce! Rias, dear, you now have THE most perfect ass in existence!”

Akeno snorted, barely holding back laughter.

“Oh my gods, Rias, your butt is MASSIVE!”

Rias, still off-balance, flailed slightly as her hips shifted, her massive rear wobbling uncontrollably with every tiny movement.

“It is also ABSOLUTELY useless to sit down now!” she shouted, struggling to keep herself stable. “Or even to stand for that matter!”

Her center of gravity had completely changed, forcing her to stand slightly wider just to accommodate the sheer girth of her new backside.

Wan-Ting giggled. “Oh, Rias, you look incredible! I mean, look at it! It’s practically an unstoppable force!”

Rias groaned, the commentary really not helping much.

“I didn’t want to be an unstoppable force, you know!” she snapped.

Her massive rear wobbled violently in response, making Akeno double over in laughter.

Wan-Ting tilted her head playfully. “Ohhh, but I think it’s exactly what you needed! You now have the most legendary curves ever!”

Rias, sweating, shifted uncomfortably—only for her own movements to send another uncontrollable jiggle through her absurdly oversized backside.

“…just saying, your ‘game’ so far didn’t make a very good impression on me.” Rias spoke, although she didn't pay attention to which mouth that was coming from. She had reached the point where she just stopped caring.

Akeno, however grinned mischievously.

“Sooo… wanna sit down?”

Rias threateningly smiled back at her.“You know, I always wanted to find out if your plush belly makes for a good seat. Wanna help me find out?”

“Bring it on~”

“Ladies, Ladies—” Wan-Ting, grinning as always, clapped her hands together. “Let’s keep the experiments for later! Now that Rias has achieved legendary curves, it’s time to see what Akeno will get next! Spin the wheel, dear~!”

Akeno chuckled, stepping up to the roulette wheel, her massive muscles flexing effortlessly as she grabbed the handle.

“Let’s see what fate has in store for me~” she purred, spinning the wheel hard.

Clack. Clack. Clack.

The wheel spun rapidly, blurring as the colors merged together into a whirlwind of transformation possibilities.

Clack… clack… clack…

Rias crossed her arms, struggling slightly as her massive chest and enormous rear made even simple gestures feel off-balance.

Akeno simply watched the wheel with anticipation.

Finally, it slowed down…

Clack… clack… clack…

And then—

It stopped.

A vial on the potion table glowed, its contents a deep, silky purple that shimmered like liquid moonlight.

Wan-Ting let out a delighted gasp.

“Ooooh~ This one’s a FANTASTIC choice!”

She plucked the potion from the table and handed it to Akeno.

“Drink up, dear! This one will be very hands-on!”

Akeno raised an eyebrow, intrigued.

“Ara~? A pun? Well, I do like a bit of mystery,” she mused.

With zero hesitation, she lifted the vial and drank it down in one go.

The moment the liquid touched her tongue, it felt silky smooth, with a hint of sweetness.

Then—

A strange tingling sensation started in her scalp.

Akeno blinked.

“…Oh?”

The tingling spread down her ponytail, pulsing slightly, as if something was shifting inside it.

Her long, flowing black hair suddenly twitched.

“…That’s new.”

Before she could fully react, her ponytail began to move on its own.

It split into two, the strands twisting and curling, the ends morphing into something new.

Akeno felt it before she saw it.

Her hair was growing hands.

Two perfectly formed hands sprouted from the tips of her newly split ponytail, each one flexing its fingers, testing their newfound existence.

Akeno stared in fascination, watching as her own hair now had fully functional hands.

Then—they moved.

The two hands slowly drifted downward, curving up behind her back, beneath her arms—

And placed themselves directly onto her breasts.

Akeno blinked.

“…Hmmm~?”

Her new hair-hands squeezed experimentally.

Akeno let out a small gasp as they groped her firmly, pressing into her massive chest with slow, deliberate kneading motions.

Rias, watching the entire thing unfold, and then couldn't contain a giggle herself. “Boob groping hair?”

Akeno smirked, tilting her head slightly, watching as her newly animated hair seemed to have a mind of its own.

“You got it, my dear Rias!” Wan-Ting clapped her hands together, absolutely delighted.

“Akeno, my dear, you’ve just experienced the Boob-Grabbing Hair Potion!”

Akeno raised an eyebrow, amused. “I see. So they stay placed like this?”

Wan-Ting giggled mischievously. “Well, darling, it's in the name and it’s exactly what it sounds like! Your hair has now developed hands, and its sole purpose… is to permanently keep your lovely chest well-attended to!”

Rias choked on air. “Wonderful…! Those things really were invented by Issei, weren't they?”

Before Akeno could fully enjoy her new situation, a sudden pulse of energy rushed through her scalp again.

Her hair thickened, lengthened, pulsing with magical energy.

Then—

Her hair-hands gripped tighter.

Her entire chest was pushed up and pressed together, the new appendages becoming even more forceful.

The massaging motions increased, the grip firmer, the movements more coordinated.

Akeno let out a soft breath, half-lidded eyes flickering with curiosity.

“…Oh my~ They’re getting better at this.”

Wan-Ting gushed. “Of course! This magic adapts over time! Your hair learns how to please you more efficiently! The perfect self-care system!”

Rias just rolled her eyes, but then her gaze landed on her own massive chest. “Yeah, it’s perfect. Keep it Akeno, I wouldn't want those things anyway.”

Akeno, fully embracing her new situation, sighed playfully and flexed her huge, muscular arms.

“Well, Rias, don’t mind if I do~ Those two extra hands seem… quite dedicated~ I wonder if Issei can do it as well as those.”

Rias glared. “...why is that where your mind goes at times like these?”

Akeno grinned as her new hair-hands gave her chest a gentle squeeze in response. “Ara ara~ I think we’re going to get along just fine~”

“Well, ladies! We’re down to our FINAL TWO POTIONS!” Wan-Ting suddenly spoke up, standing between them, clasping her hands together in excitement.

Rias and Akeno both turned to look at the last two glowing vials on the table.

One potion was a deep, silky pink, its glow pulsating in an oddly hypnotic rhythm.

The other was a dark, shimmering gold, thick and heavy, swirling slowly as if it carried great weight.

Rias stared at them, her stomach twisting. “I already don’t like those. Whatever they are, I don’t like them.”

Akeno grinned. “Oh my~ This is our final transformation, Rias. Let’s make it count~”

Wan-Ting nodded excitedly.

“...as if we had any control over them…” Rias sighed from her left breast, but shrugged her shoulders.

"Since we’re down to just two, I have a fun suggestion~! Instead of spinning for them, why don’t you each pick one… and drink at the same time?"

Rias and Akeno exchanged looks.

“…So we’re choosing our own fate?” Rias muttered.

Akeno giggled. “I suppose so~”

They both stepped forward, standing in front of the table.

A long silence hung between them.

Two potions.
Two choices.
No way of knowing the outcome.

Rias sighed heavily. “Well… guess we should just get this over with.”

Akeno, smiling playfully, reached out and picked up the pink, pulsing potion.

Rias, reluctantly, grabbed the heavy, golden vial.

They turned toward each other, potions in hand.

A moment passed.

“…Good luck,” Rias muttered.

Akeno smirked. “Ara ara, Rias~ You’re going to look amazing~”

Rias sighed. “I reiterate: I don’t know what they are, but I am sure I don’t like either option.”

Akeno laughed lightly. “Well, no turning back now~”

Wan-Ting bounced excitedly on her heels. “Bottoms up, ladies! Let’s end this show with a BANG!”

The tension was high.

Both of them lifted their potions to their lips—

And drank.

Rias lowered the vial, the thick liquid settling in her stomach like a warm pulse of energy.

Akeno, meanwhile, licked her lips as she swallowed the last drop of her own potion, feeling an instant tingle spread through her entire body.

Wan-Ting clasped her hands together, trembling with pure excitement.

“Ooooh~ This is it! Our GRAND FINALE! Let’s see what kind of final gifts our lovely contestants have received~!”

Akeno stretched slightly, her massive, muscular form flexing effortlessly, while Rias just stood there stiffly, already dreading whatever was coming.

Then—

It began.

A sudden warmth spread through Rias’s chest, her already massive breasts tingling with a sensation she recognized all too well.

“…Oh, hell no. Don’t make those girls bigger, please…”

She glanced down, horrified, as the soft pressure in her chest deepened.

It started slowly—a gentle, pleasant stretch, as if her skin was expanding.

Then—

A second pair of breasts began to push forward beneath the first. 

Rias’s entire body stiffened. 

“No, thats even worse!” 

Her skin stretched effortlessly, the new set of breasts rounding out, filling quickly, matching the size and plushness of her original pair. And of course, coming with their own thick lips to add to Rias’ mouth count.

Her outfit was beyond hope.

The fabric strained dangerously, her already excessive cleavage doubling as four impossibly large, heavy, and perfectly shaped mounds swayed from her torso.

Akeno, watching the entire process, let out a low whistle.

“Oh my~ Double the fun, Rias?”

Rias clutched her head, getting a headache from this madness, yet speaking from her regular mouth surprisingly. “This feels so, so wrong!”

Wan-Ting giggled gleefully.

“Oh, Rias, dear~! You’ve been blessed by the Multi-Boob Potion! Instead of just two, you now have FOUR perfectly proportioned, ultra-bouncy, impossibly soft assets!”

Rias looked down, feeling every movement from her newly expanded chest.

“…I have never thought there would come a day where I think that someone has too much boobage, but here I am. Definitely having too much boobage.”

Akeno, grinning like a cat, couldn’t stop staring.

“Ara ara, Rias~ Between you and me, I think you have the perfect Boobage~”

Rias shot her an unamused side eye.

“Your opinion is dearly noted. I’ll make sure to tell the club about your opinion later, okay?”

But as the two of them were shooting comments back and forth, she noticed something—

Akeno wasn’t standing still either.

While Rias was still coping with her doubled assets, Akeno let out a soft breath, feeling a strange heat pooling low in her core.

Her legs shifted slightly, her muscular thighs tensing as a completely foreign sensation spread between them.

Akeno raised an eyebrow, her lips curving into a small smirk.

“…Oh my~ I think I know what this is~”

Wan-Ting squealed in delight.

“DING DING DING! Akeno, you’ve just consumed the BIG DICK FUTA POTION!”

Rias, still struggling to hold up her ridiculous new chest, froze.

“…Excuse me, WHAT?!”

Before Akeno could respond, the sensation intensified.

A deep pulse of power surged between her legs, her clothing shifting as something began to push forward.

She felt it grow, the foreign weight tugging downward, stretching longer, thicker, heavier by the second.

Akeno exhaled sharply, her eyes half-lidded, hands settling on her hips as she felt herself expand.

“Mmm~ Now this is interesting.”

Her already stretched clothes became even tighter, a new bulge forming as the growth refused to stop.

Wan-Ting clapped her hands.

“Oh my! Look at that size! That thickness! That POWER!”

Akeno, smirking, ran a hand over the obvious outline beneath her clothing, testing its weight as it grew longer and longer.

“My, my~ This is quite a lot to take in. Do you think I am closer to Issei like this?”

Rias gawked at the rod that was almost the length of her hand by now.

“WHY THE HECK IS THIS WHERE YOUR MIND GOES?!”

Wan-Ting, practically glowing with excitement, gestured grandly.

“Oh, Akeno, dear~ You’ve officially joined the futa elite! That massive, powerful addition is now all yours! Think of the possibilities!”

Akeno grinned wider, shifting her stance as she adjusted to the new weight.

“My~ It does feel… empowering.”

Rias threw her hands up in resignation. “You two girls are something else. I can’t even with you anymore…”

Wan-Ting laughed.

“Oh, Rias, my dear~ It’s just a bit of fun!”

Rias glared at her.

“I now have four giant boobs, and Akeno has—” She stopped herself, unsure to even say it.

Akeno leaned forward, smirking.

“Ohhh~ Come on, Rias~ Say it.”

Rias’s eye twitched.

“I refuse.”

Wan-Ting giggled.

“Well, my lovely contestants, with these final transformations, that means… THE GAME IS COMPLETE!”

Akeno flexed, shifting her massive, powerful physique while testing her newest addition.

Rias crossed her arms, which only made her ridiculous new chest bounce uncontrollably, causing her to groan in frustration.

“…finally some good news.”

Wan-Ting beamed.

“Oh, Rias, dear~ I'm glad you like it.”

“I don't."

“But I kinda do.” Akeno grinned playfully, still getting a hang of her new body. “This is something new after all.”

Rias just groaned and massaged her temples.

Wan-Ting clapped her hands.

“Thank you for playing, ladies! You were some amazing volunteers! Now, as promised—”

A flash of light erupted, and suddenly—

They were gone.

— Epilogue —

The transition back was instant.

One moment, Rias and Akeno stood on the game show stage, their newly transformed bodies still adjusting to the sheer absurdity of their final changes.

The next—

FLASH!

They were back in the familiar Occult Research Clubroom.

The rich scent of tea lingered in the air, and the soft glow of candlelight bathed the elegant room in a warm hue.

For a long moment, neither of them moved.

They just stood there.

Processing.

Finally, Akeno sighed, rolling her shoulders—her massive, muscular form stretching as she adjusted to the new weight of her overdeveloped physique.

“Well~ That was… certainly an experience,” she purred, running a hand down her now very crowded torso.

Rias, her four massive breasts heaving with every breath, sighed deeply, pressing her fingers to her temple.

“…you could say that again.”

Akeno chuckled, poking her own plush, round belly.

“Oh, come now, Rias~ You can’t say it wasn’t at least a little fun~”

Rias shrugged.

“Maybe a little bit, but honestly I am more concerned with figuring out how to reverse this.”

Akeno giggled, stepping forward with surprising grace despite the monstrous thickness of her newly muscular legs.

“Well~ At least we’re back! And look—our tea is still warm.”

Rias blinked, turning her attention to the table.

Sure enough, their tea cups sat neatly where they had left them, steam still rising from the surface.

Akeno sighed happily, sitting down on the couch and reaching for her cup—only for her overly muscular fingers to wrap around it with too much force.

CRACK.

The delicate porcelain shattered instantly in her grip.

Akeno stared at the broken shards in her palm.

“…Oh.”

Rias smirked. “Having fun yet?”

Akeno chuckled, carefully brushing the remains of the cup onto the table.

“Well~ I did enjoy gaining all of these additions,” she admitted, flexing one massive bicep, “but I must say… they’re very impractical.”

She gave her new bulge a small adjustment, shifting uncomfortably.

“VERY impractical.”

Rias let out a low laugh, shaking her head as she grabbed the teapot.

“Well, I’m going to make more tea, since someone just destroyed a perfectly good cup.”

She turned toward the counter—

And forgot how large her rear was.

SMACK!

Her absurdly massive, planet-sized backside slammed into Akeno with the force of a wrecking ball.

“OOF—!”

Akeno was launched off the couch, tumbling onto the floor with a soft thud, her newly thick thighs kicking up slightly.

Rias froze.

Akeno, flat on her back, let out a stunned breath before dissolving into laughter.

Rias almost broke into a giggle too.

“I guess that is just something I need to get used to now… Pfff~”

Akeno pushed herself up, brushing her long, flowing hair out of her face—

Only for her hair-hands to immediately return to her breasts, kneading them firmly.

One of them gave a particularly well-placed squeeze—

And Akeno let out an involuntary moan.

“Mmm~ Ooooh~”

She bit her lip, her cheeks flushing slightly.

Rias turned slowly, arching a brow.

Akeno coughed lightly.

“…I didn’t do that on purpose.”

Rias opened her mouth to say something—

“Sure you didn’t.”

But instead of her actual mouth speaking—

All four of her chest-mouths responded one after another.

“You like it that well, huh? Akeno~”
“We both know you enjoyed it~”
“You are lucky Issei wasn’t in the room.”

Rias groaned, having literally spoken through every mouth but the one she wanted to.

“Why is this such an impossible task, damnit! I just want to use the mouth that isn't attached to my boulder boobs!”

Akeno, seeing Rias’s pure, undiluted suffering, burst into giggling fits.

Rias, despite her best efforts to be angry, found herself laughing too.

For the first time since their transformations, they both shared a genuine moment of amusement.

Their giggling echoed through the room, and for a brief second, everything almost felt normal again.

And then—

A knock at the door.

Both of them froze.

Then—

A familiar voice.

“Hey, President? Akeno? You guys in there?”

It was Issei.

Rias and Akeno both gulped at the exact same time.

They turned toward the door, eyes wide, their transformed bodies fully on display.

Akeno whispered in panic.

“…I know I joked about this, but… He can’t see us like this.”

Rias nodded rapidly, her four breasts bouncing wildly with the motion.

“I know!”

The door handle started to turn.

Rias and Akeno looked at each other, silently screaming.

Then—

The door swung open…

THE END