Millie's Monstrous Muscles

WARNING THIS STORY CONTAINS: Millie (Helluva Boss) Muscle Growth

WORDS: 3000

Drawing from the power of Stolas's grimoire, Millie ends up turning herself into a muscular, hulking monster.

This story was a commission for Dropvault_Of_Glacier on FA: https://www.furaffinity.net/user/dropvaultofglacier/

Commission Info: https://www.deviantart.com/eyebeast/journal/Commission-Info-615442807

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            Sitting alone on the bed in her apartment, Millie kept her yellow eyes focused on the pages before her. The diminutive, red skinned imp had been silently dealing with an intense sense of dread ever since her last mission. The lack of power in her small form had led to her and Moxxie nearly being killed by the nefarious Striker. Though her husband was glad that they had managed to come out unscathed and succeeded in driving off the the bounty hunter, the thought lingered in her head that they might not be so lucky next time. She needed to do something to ensure she wouldn't lose the thing she held most dear to her.

            Chewing on her black painted lips, Millie paused as she found what she was looking for amidst the pages before her. Even if it wasn’t anywhere near her expertise, she had perused Stolas’s grimoire enough to glimpse at the power that lurked within. What she had been specifically searching for was a spell capable of drastically increasing her fighting prowess. She found what she was looking for in the form of the text in front of her that promised to unlock the innate powers of her nature as a demon from the Wrath Ring.

            Smiling at her discovery and accidentally skipping over the warnings, Millie wasted little time beginning to recite the necessary incantation. As the words flowed out of her mouth, an eerie red glow began to emit from the tome. The crimson aura reflected off of her black horns and outfit as if it was trying to meld with her. She could feel a presence trying to push into her very being. It wanted to change her in exchange for unimaginable strength. Grin becoming wider in the process, she freely allowed the magic to flow inside of her and take hold.

            Millie’s acceptance of the enormous surge of power came with a strange mix of rage and unnatural pleasure. A satisfied huff left her lips as her figure began to pulsate with strength. Forced to drop the grimoire as her hands were shaken by the tremors, she attempted to reach out to recover it. However, her attempt to pick up the grimoire was overridden by her need to address the sight of her arms beginning to bulk up with muscle.

            Holding the limb up to her face, she could easily tell that it had doubled in size. A similar increase in muscle allowed her other arm to match at the cost of tearing apart her gloves in the process. Upon feeling her legs starting to go through the same process, she tried to get off of the bed. While she was unable to remove her shoes before they were popped off by her growing, cloven feet, it was a small price to pay for the discovery of her other gift.

            Stumbling across the room, Millie’s wayward steps allowed her to gradually become accustomed to her increased stature. Being at twice her original height, she found strange glee in getting to see the room with a new perspective. Each twitch of her added bulk fed into the desire for power she had been feeling since the perilous mission. Still feeling the magic taking hold, she eagerly waved about her spaded tail as she awkwardly stomped her way over to the mirror.

            Millie managed to arrive just as the rest of her body began to catch up to her powerful limbs. She lost a bit of shapeliness to her chest, but it became worth it for the sight of her bulged out pecs straining her shirt. A similar boost in muscle created more tears along her pants as her hips and thighs grew outwards. Even if she had to step back to fully see them, her developing abs were a great addition to her already imposing figure.

            Coming to a standstill, the lingering adrenaline pumping through Millie’s veins got her to start posing in front of the mirror. As she stood there, admiring her newfound muscles, she couldn’t help noticing that she was just barely larger than Verosika’s body guard, Vortex. Sliding her fingers along her pumped up biceps, she began to wonder how easily it would be to beat the canine demon in an arm wrestling competition.

            As Millie was sizing up her calves to see if a sprint would be a fairer contest against the seasoned bodyguard, her ears perked up the sound of a tear echoing through the room. Carefully turning herself around, she managed to see the reflection in the mirror of the sizable hole her tight buttocks had created in the seat of her pants. The bare crack elicited a small giggle from her, but she didn’t have any reason to fear. She was sure that this was a simple issue that could be fixed by going up a few wardrobe sizes.

            Wandering away from the mirror to find a blanket to cover up her bare bottom, she halted at the sound of something scraping against the ground. Tilting her head forward to look past her chest, she managed to see that her hooves had continued to grow to accommodate the rugged, sharp ends that had appeared on their bottoms. Things only became more dire as her view became blocked by her biceps beginning to swell once more.

            Feeling the same power as before coursing through her veins with increased fervor, Mille began to regret her rush to use the spell. Before she completely lost control, she tried to rush over to pick up the lost grimoire and find a way to stop the process. Unfortunately, the awkward swinging of her muscular arms only succeeded in pushing the book beneath the bed with a swipe of the newly grown, ebony claws at the tips of her fingers.

            Millie’s attention soon drew towards the throbbing sensation coming from the top of her head. She ended up nearly pricking herself with the fearsome nails as she reached for her scalp to try and get a handle on the situation. Moments after her palm touched her hair, it was shoved back by something emerging out from the strands. Careful not to fall over on her more savage hooves, she slowly meandered back over to the mirror. Having to stoop down to get a good look at what was going on, what she discovered was that her once cute and well-maintained horns had tripled in size and bent backwards at the halfway point.

            The momentary thought Millie had of using her enhanced horns to gore someone on a job lasted until the throbbing sensation reappeared in her mouth. Her lips were forced open as a set of fearsome fangs took the place of her teeth. Opening up to fully take in the sight of her fearsome maw, she couldn’t help letting out a gasp.

            “What in the hell is happening to me?” Millie asked aloud, her ears ringing at the guttural, gruff voice that came from her own vocal chords. “There’s gotta be a way to stop this. Maybe the book has-GAAAAAHHHHHHH!”

            In the wake of another series of tremors going through her body, Millie accidentally swung about her tail and the enlarged series of spikes lining it. The mace-like appendage’s wild failing ended up smashing into several pieces of furniture before crashing into the mirror. The shattered glass that spread across the floor provided multiple viewing angles of her muscles as they began to pulsate. Crushing the shards beneath her hooves, she tried to fight back against the forces trying to put her through her metamorphosis. Unfortunately, she was far past the point of no return.

            Millie’s already impressive bulk continued to swell as more muscles were packed onto her body. Perhaps sensing her poor sense of balance, this increase in girth centered on the goal of widening out her waistline. The cost became clear as her pants strained against her thicker calves as they rippled with newfound strength. Still dealing with the power building up inside of her, the most she could hope to do with the arcane forces making her legs swell was to continue stumbling around the room. When her pants were finally torn asunder, her toned butt cheeks managed to show off their girth as a set of boulder-like mounds that looked large and hard enough to crush a couch into a million pieces.

            Stomping across the remains of her pants and underwear, Millie only had a moment to appreciate the generous eight-pack abs showing through the skin-tight fabric of her shirt. Her impressive mid-section became cast in the shadows of her chest as it continued to bulge out. Any semblance of her breasts was taken up by her swelling pecs as they grew larger than her head. Not to be outdone, her shoulders engorged with extra mass to make it near impossible for her to look behind her. With her torso bulking out to match the width of a car fender, she expected at any moment for her top to be torn asunder.

            So busy watching her suspender’s struggle against her pronounced chest, Millie nearly fell over as one of her arms went through a sudden growth spurt. Though she did manage to catch herself with her engorged, right arm, it was at the cost of digging her claws into the floor to stabilize herself. Thankfully, her left was quick to catch up to even her out as she got herself back int a standing position. Fully upright, she flexed the 80-inch wide biceps to try and get a baring on her situation. While her thoughts were still being plagued by the demonic aura, the slight movement helped her through the daze by giving her a shot of adrenaline.

            Any satisfaction Millie got out of her colossal arms was undone immediately by the feeling of plaster trickling onto her scalp. Her attempt to look up and see what was wrong only widened the gash in the ceiling as her jagged, savage horns were moved upwards. The scattering of more plaster on her face forced out an aggravated grunt from her lips. Aside from showing off her even deeper voice, the sound let her breath slide across the set of fangs that had grown too large to be contained by her lips.

            What would have just been a slight annoyance to Millie at the mess was cranked up thanks to the influence of her new bulk. Clenching her fingers, she proceeded to stomp her way through her home without any care for what got in the way. Reaching the bedroom’s entrance, she thought little of how she broke through the wall to make her girth fit through. Any unfortunate piece of furniture that got in her way was effortlessly tossed aside or crushed beneath her mighty hooves. Amidst her rage fueled mind, she was at a loss of what to do with her newfound power other than rip apart anything she could get her claws on to properly express her fury.

            The bloodlust welling up behind the formerly tiny imp’s induced anger became more focused as her ears picked up something at the front door. Sifting through her primal thoughts, she was able to latch on to the concept of the sound meaning that someone was trying to get inside the apartment. Eager to crush whoever dared to enter her lair, she made a beeline towards the entrance with the intention of beating whoever it was to a pulp. Just before she could make the final push needed to bash the door open with her head, it and the person waiting out in the hall were saved as it swung open.

            Standing on the other side of the entrance was Moxxie. The white haired and suit-clad imp looked up in awe as he beheld the hulking behemoth before him. Though her mind was still overflowing with aggression, the sight of her beloved husband made Millie stop in her tracks. Standing up a little straighter ended up being the breaking point of what remained of her outfit. No longer able to compete against her pecs, her overalls broke apart to send a button flying towards the imp and leave her completely exposed.

            “M-Millie?” Moxxie asked, flinching as the button bounced off of his head. Taking a step closer, he kept his gaze on the wealth of muscles making up her new form. “Is that really you?”

            Hearing Moxxie’s voice swapped the hatred and violence in Millie’s mind with a different type of desire. Showing off her fearsome teeth with a wide grin, she squatted down to loom over the much smaller imp. “In the flesh,” she answered, reveling in the sight of his hair getting bristled by her breath.

            “What happened to you?” he asked, shifting back and forth to try and take in the entire sight of his wife’s wealth of muscles. “Are you alright? What are we going to do about all of the furniture? It’s almost as bad as when the boss-“

            Moxxie’s myriad of questions was silenced as Millie reached out and grabbed his mouth. “Enough talking,” she said, using the opportunity to pick him up with her free hand as if he weighed no more than a feather. “You’re coming with me, stud. I want to have some fun with you. Got it?”

            “Y-yes, mam,” Moxxie replied, shuddering with excitement within the embrace of Millie’s bulky arms as she carried him over to the wrecked bedroom.

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            After taking several, deep breaths, Moxxie finally spoke, “how long did you say that the spell would last?”
            “The grimoire said about 24 hours,” Millie replied, tussling with his hair as she cuddled up with him on the ragged remains of their bed. Seeing the sprinkle from above, she managed to shield him from a trickle of plaster from the ceiling with her hand. “I reckon after what we just went through, I should be back to normal before this afternoon.”

            “That’s good to know,” Moxxie began, sliding his palm along the breadth of her sizable chest, “but that doesn’t make up for how reckless you were.”

            The brute of a woman put on a meek expression as her eyes became filled with guilt. “I know, Mox. But, I had to do something. I felt so weak in our fight against Striker and I didn’t want you getting hurt again.” Raising up her arm, she gave the mighty biceps a flex. “Maybe if I can figure out how to use this body the right way, I’ll be able to use it for work.”

            Moxxie scratched at his head. “I guess it could be helpful, but we’ll definitely need some training first to make sure you can control your strength.”

            “Yeah,” Millie replied, sitting up only to get go back down as her horns scraped against the ceiling again. “Well, as long as you don’t mind having a terrifying monster as a wife.”

            “Millie, don’t say that,” Moxxie replied, straining his arm to get it to caress the underside of her chin. “You know I’ll always love you. No matter how you look.”

            “Thanks, Mox,” Millie said, leaning down to give him a soft kiss to his forehead. “So, are you up for another round? I think some of the larger strap-ons still fit me.”

            “Ooh, yeah that sounds like a great idea,” he said as he began to roll off the bed. “Wait right here and I’ll go grab the lube to-“

            Moxxie was stopped by a sharp pain shooting across his pelvis. No loner entranced by conversing with his hulking wife, he was hit all at once with the lingering weariness of their acts of passion. Seeing the pain on his face Millie gently grasped him to pull him back into a cuddle.

            “Let’s save more experimentation for next time,” Millie suggested as he cuddled up to her chest. “For now, I’m alright with just being with my big man.”

            Moxxie let out a laugh. “Alright, little lady,” he replied, getting ready to doze off within the embrace of the brutish woman who he loved so much.