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Heart to Heart with Demon Royalty (An Amphibia/Helluva Boss Crossover AU Story)

Summary:

*What if Anne Boonchuy and her friends discover an Asmodean Crystal instead of the Calamity Box?*

Marcy Wu (one of Anne's friends) stars in this part of the AU as she gets to meet Octavia and Stolas Goetia and makes attempts to befriend them.

Notes:

This is my first story ever, and it might be weird and lengthy, but hope you enjoy!

Please know that the story is obviously not canon and it's all part of my imagination.

Later on in the story, I made up a female imp butler character, so hope you don't mind.

(See the end of the work for more notes.)

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It had been three weeks since Marcy Wu and her friends—Anne Boonchuy and Sasha Waybright—were accidentally separated. The cause? A blinding flash of light from a massive crystal, one that had been displayed at a local thrift store near their neighborhood. Anne had stolen it under Sasha’s peer pressure, but none of them had known what it really was. The next thing they knew, they were flung into different locations within a bizarre realm of towns and cities, unlike anything they had ever seen.

The funny thing? This was no ordinary place. In fact, it was Hell. And as each of the girls would come to realize, Hell wasn’t just endless fire pits and eternal suffering like so many stories claimed. Sure, there were sinners of all kinds—humans who had met their unfortunate ends—but there were also demons, creatures born and raised in this infernal world, many of whom knew nothing of the mortal realm.

Three teenage girls, alive and stranded in a realm they had no business being in unless they were… well, let’s just say, permanently deceased. No offense. No one could predict what kind of situations they would find themselves in.

But let’s not get ahead of ourselves. The girls were fine. For now.

This story, however, is about Marcy Wu. Our quirky, Taiwanese-American goofball is the reason this story exists.

Now, where were we? Right.

Three weeks had passed since Marcy and her friends landed in Hell.

Actually, you know what? Let’s skip ahead to how Marcy met Stolas in the first place. That’s far more interesting. We’ll get to the three-week time skip later when she finally explains how she got her friends to go along with her little escapade. For now, let’s rewind to the moment she first stepped foot in Hell.


On her first day in Hell, Marcy had been a mix of terrified and fascinated. The initial fear came naturally—after all, she had just crash-landed into the underworld. But her curiosity quickly took over, especially once she realized that not everything here was, well, horrifying. Sure, there were a few things she had to actively avoid looking at (things she did not want to process), but aside from that, Hell was oddly intriguing.

She wandered for hours, searching for shelter while formulating a plan to reunite with her friends. As exhaustion crept in, so did a dull, numbing pain in her left ankle. She must have twisted it at some point. But she pushed on, stubbornly covering a few more miles before she finally had to stop.

By the time she reached the front steps of a grand palace—a towering structure so massive it could rival a skyscraper—night had fallen.

Under normal circumstances, she would have taken a moment to marvel at its intricate design, but fatigue overpowered her curiosity. Even standing felt like a chore. She needed rest.

Hopefully no one will mind if I just sleep on the front steps, she thought, rubbing at her sore ankle. Maybe it won’t be as bad in the morning. I’ll be out of their way before they even notice me.

With that, she carefully removed her green backpack and set it neatly on the ground, making sure nothing inside spilled out. Back home, she had a reputation for being clumsy, but here in Hell, she was trying—really trying—not to make careless mistakes.

She peeled down her sock to inspect her ankle. Sure enough, it was swollen and red. Wincing, she pulled the sock back up, leaned against the stair railing, and shut her eyes. Sleep didn’t come easily, but eventually, exhaustion won.


Unbeknownst to her, someone took her inside the palace while she slept.

She didn’t stir once, even as she was carefully placed in a soft bed.

When she finally awoke the next morning, the first thing she saw was a young, slender avian demon staring at her.

Marcy blinked groggily, still half-asleep, taking in the girl’s appearance—owl-like features with hints of swan, pink eyes with white pupils framed by purple eyeshadow, dark gray feathers, pale white fingers, and long, gray tail feathers that darkened at the tips.

Marcy should have been afraid. Instead, she was just… curious.

The avian sighed in relief. “Glad to know you’re not dead or anything. Oh, what am I saying? This is Hell—of course there are plenty of dead souls here.” She rolled her eyes before focusing back on Marcy. “Anyway, what’s a human like you doing here? And before you ask how I know what you are, it’s thanks to my dad. He told me stories as a kid.”

Then, as if realizing something, she groaned and lightly facepalmed. “Ugh! I didn’t even give you a chance to speak yet. Sorry about that.”

She turned to Marcy expectantly. “What’s your name?”

“Marcy,” the teen answered. “What’s yours?”

“Octavia. Nice to meet you, Marcy.”

“You too, Octavia.” Marcy smiled back, suddenly feeling more awake. She sat up, finally registering her surroundings—a bedroom with a distinct pink and purple theme. The blanket covering her was deep purple with crescent moons. A solar system model hung from the ceiling.

Wait.

Her gaze snapped back to Octavia. “Where am I? I was outside a giant palace before… how did I end up here?”

Octavia chuckled softly. “That palace belongs to my dad. And clearly, you’re in part of it—specifically, my room.”

“Wait, what?!” Marcy shot up, only to freeze mid-motion. Octavia was taller than her. Not by much, but still noticeable. Also, her shoes were missing—she was standing in just her socks. Oh. At least my ankle feels better.

Marcy’s mind raced. “So… your dad is a king, you’re a princess, and I—oh no, oh no, oh no—I just wandered into a royal palace without permission?! I—I'm so sorry! I’ll get out of your way right now!”

“Whoa, easy there, Marcy.” Octavia held up a hand. “It’s okay. If anything, I should be the one apologizing. I was the one who brought you inside.”

Marcy blinked. “Wait… you brought me here?”

“Yeah. I saw you asleep outside the palace and wasn’t sure what to do, so I asked my dad to take a look. He said you seemed harmless. He also noticed your ankle injury, so he used a little magic to ease the pain.”

Octavia motioned toward a nearby couch. “I asked if we could let you stay, and when he asked if I was sure I wanted to, I insisted. He agreed. So, I carried you up here myself and let you have the bed. I slept on my couch.”

Marcy followed her gaze to the couch—a plush piece of furniture a few feet away from the bed. The bed itself was even more extravagant up close, with a deep purple canopy lined with stars and a giant eye motif at its center.

“Oh,” Marcy said, processing the information. “That… makes sense. Well, thank you. Both you and your dad. But… I don’t think I really belong here.” She glanced down at herself—her messy, short black hair, her partially sweaty school uniform, her scuffed-up shoes. Compared to Octavia’s refined yet casual appearance, she felt painfully out of place.

Octavia shrugged. “Eh, don’t worry about it. I don’t really care about all that royalty stuff, and my dad doesn’t either. Just look at my outfit.”

Marcy did. Octavia wore a black beanie with a pale yellow tiara design, a pink choker, a star-patterned dress under a black cardigan, leggings, and heeled boots. The tiara was the only thing hinting at her royal status.

“See?” Octavia said. “Being a princess doesn’t mean much to me. All I want is to spend time with my parents. But they’re too busy arguing all the time to even notice me.”

Her voice grew quiet. “I talk about my dad more because I’m closer to him, but I still want both my parents in my life. I don’t think that’s happening, though. Not with how things are going. I think… I think they might be divorcing soon.”

Marcy frowned, then gently placed a hand on Octavia’s shoulder.

“I can’t say I know what that’s like,” she admitted. “But I do have a friend who’s been through something similar. Well… actually, I have two friends. We got separated when we ended up here, but I will find them. Maybe when I do, I can introduce them to you.”

She reached into her hoodie pocket, pulling out a photo—one of her, Anne, and Sasha, smiling together, the words BFFs!! scribbled at the bottom with a purple heart.

Octavia stared at it curiously as Marcy pointed to one of the girls in the picture.

Marcy and her friends

Marcy held up the photo, pointing to the leftmost girl with curly hair and a bright smile.

"The one on the left is Anne. She’s my first-ever best friend. We met on a beach as kids while I was making a sandcastle. She came over and started helping me build it, and we’ve been inseparable ever since."

Her finger moved to the center of the picture.

"And the one in the middle is Sasha. She’s my second best friend. Anne and I met her at a playground, and she stopped a group of older girls from bullying us. She’s always been the tough one, looking out for us."

Marcy stared at the photo for a moment, a mix of nostalgia and longing in her expression.

"Sasha is the one with divorced parents, by the way, so she can definitely relate to what you're going through. And as for Anne—she may not have divorced parents, but unlike me, she’s really good at fixing relationships and even matchmaking. She just… has a way with people. If I can find them, they might be able to help you in ways that I can’t."

She looked at Octavia with a small but reassuring smile.

"But I can tell you this: no matter what happens, the bond you share with your parents—especially with your dad—won't change. You just need to have faith in yourself."

Octavia’s pink eyes shimmered with a newfound sense of hope. She held Marcy’s gaze before breaking into a grin.

"Thanks, Marcy. Just having you around already makes me feel better." She chuckled. "You really are as harmless as my dad said."

Marcy grinned back and reached for her backpack, which was neatly placed on the floor next to the bed. Unzipping it, she carefully tucked the photo inside before closing it up again.

Suddenly, there was a knock at the door.

"Come in," Octavia called.

The door swung open, revealing a short female imp with a long black ponytail, dressed in elegant butler attire—a crisp white blouse, a gray vest, fitted black pants, and polished black heels.

"Lady Octavia," the imp began formally, "your father is waiting in the dining room. He wishes to speak with you. He has also requested an audience with the human, provided she is ready."

Octavia nodded. "Okay. I’ll be there soon."

She turned to Marcy, hesitating for a brief moment before speaking. "So… are you still planning on leaving anytime soon? I mean, it’s totally up to you, but…" She rubbed the back of her neck, blushing slightly. "Honestly, you’re already like the little sister I never knew I needed. And we just started getting to know each other."

She quickly waved her hands, flustered. "I-I’m not trying to force you to stay or anything! I’m just saying that life in the palace won’t be so bad with you around, you know?"

Marcy stared at her, thoughtful. Originally, she had intended to leave as soon as she woke up. But after hearing everything Octavia was going through—the loneliness, the uncertainty about her family—Marcy found she couldn’t just walk away. She didn’t want to see Octavia sad again.

Breaking the silence, she smiled.

"Actually, I changed my mind. I’ll stay."

Octavia’s eyes widened in surprise before lighting up with excitement. "Really? That’s great!"

She quickly cleared her throat, regaining her composure. "Well, since you’re staying for a while, let’s get you cleaned up before you meet my dad. No offense, but… you really need a bath." She waved a hand in front of her face for emphasis.

"None taken," Marcy said with a sheepish laugh. "I know I smell. That was actually part of the reason I thought about leaving—I felt bad for making your bed all sweaty."

Octavia shrugged. "Like I said, it’s fine. The butlers clean it anyway. Oh! Speaking of cleaning, you seemed surprised about your shoes being missing earlier. That’s because they looked like they needed polishing. Don’t worry—you’ll get them back soon. They’re being placed in a shoebox so they stay in good condition."

Marcy blinked. "Wow, you guys are really thorough here."

"Of course we are." Octavia smirked. "Now, come on. I’ll show you where the bathroom is while Vanessa takes care of my bed."

At the mention of her name, the imp butler—Vanessa—gave a small nod of acknowledgment.

Octavia turned to her. "I’ll let my dad know that Marcy will be ready after she freshens up. She’s still adjusting to being here, after all. Hope you don’t mind handling the bed while I take her to the bathroom."

Vanessa looked at the human, who gave her a shy little wave, before turning back to Octavia and bowing politely. "Not at all, Lady Octavia. It is my honor to be at your service."

Octavia nodded gratefully. "Thank you. I appreciate it."

With that settled, she led Marcy out of the bedroom.

As they walked, the two girls chatted about the little things—how old they were (Marcy mentioned she was 13, and Octavia revealed she was 17, just four years older), their favorite hobbies, and other casual topics.

Eventually, they arrived at the palace’s bathroom, and the sight made Marcy gasp softly.

The entire space was mesmerizing. Shades of deep blue and dark purple swirled across the walls like a painted night sky. The ornate bathtub sat at the center, surrounded by glowing cyan-blue candles. Their flames flickered, casting an ethereal light around the room. Astrological symbols pulsed in a soft white glow on the marble floor. The midnight-blue curtains draping the walls were embroidered with tiny stars, and floating constellations lazily orbited above them.

Marcy stood frozen in awe.

"Okay," she muttered under her breath, "this might actually be the prettiest bathroom I’ve ever seen."

 

Marcy’s eyes sparkled as she took in the breathtaking sight of the bathroom.

"It’s beautiful. I never imagined anything like this in my entire life!" she marveled. Then, with a sheepish grin, she added, "Well, except when I read my fantasy stories or play my RPGs."

Octavia chuckled. "You really like fantasy, don’t you?" she said, though it was more of a statement than a question. Then, shifting the subject, she added, "Well, take as much time as you need. My dad is very patient, so he won’t mind waiting for a while—at least, I hope he won’t."

She leaned against the doorway, thoughtful. "Just let me know when you're finished so I can send you some fresh clothes to wear. I think I have a few dresses in my room that would fit you pretty well. I’ll grab them after I check in with my dad for a bit, okay?"

"Okay," Marcy replied.

With that, Octavia gave her a quick nod and stepped out, closing the door behind her.

Now alone, Marcy unclipped her bangs, letting her short black hair fall naturally around her face. She undressed and stepped into the large tub, eager to finally get clean.

The moment she sat down, though, she realized something.

Wait. Where’s the faucet?

She glanced around, expecting to find one along the rim of the tub, but there was nothing. Confused, she scanned higher and finally spotted it—far above her head. The distance between the faucet and the tub itself was a bit of a stretch, but it was definitely the only way to turn on the water.

Marcy exhaled, rolling her shoulders. Alright, let’s do this.

She carefully stood on her tiptoes, reaching up. Her fingers barely grazed the handle.

She tried again. Still too far.

On the third attempt, she managed to get a firm grip and twisted the handle just as her balance wobbled. Water poured down from above, cascading like a miniature waterfall. Marcy yelped and ducked just in time, narrowly avoiding a direct hit to the head.

She sighed in relief and watched as the tub quickly filled with warm, soapy water, bubbles already forming on the surface.

Finally. A bath.

She slowly sank into the water, letting its warmth soothe her aching muscles. For the first time since arriving in Hell, she allowed herself to relax.

Closing her eyes, she whispered softly to herself,

"Anne… Sasha… wherever you are, I hope you’re okay. And I’m sorry for dragging you both into this. I promise… I’ll explain why I brought you here soon."

Her words faded into the quiet hum of flickering candlelight as she let herself sink deeper into the comfort of the water.


20 Minutes Later

Marcy emerged from the bathroom, feeling refreshed and clean. She had found a small bathrobe to wrap around herself, and as she opened the door, Octavia arrived just in time, her arms full of neatly folded clothes.

"Oh, you finished already?" Octavia remarked. "I was just about to ask if you were done, but I guess there's no need."

Marcy, now fastening her hairclip back in place, noticed the small stack of dresses in Octavia’s arms. "Hey, you found some dresses, I see."

"Yep," Octavia said with a smirk. "And I bet you’d look lovely in them."

Marcy smiled at the compliment, and Octavia continued, "Honestly, I don’t wear these much. My mom used to make me wear them to the ridiculous balls she hosted, but I stopped going because they were boring. Since I barely use them, I figured one of these might suit you."

She shifted the weight of the folded clothes in her arms. "Let's try them on and see which one looks best on you. We still have some time before you meet my dad, so there's no rush."

"Okay," Marcy agreed.

The dress experiment began. Some outfits were too extravagant for Marcy’s taste, others far too flamboyant. They cycled through several options before finally settling on a two-layered pale blue dress with puffy tulle sleeves and tiny glittering stars embroidered at the waistline.

"Perfect," Octavia declared as Marcy did a light twirl in front of the mirror.

"It’s really pretty," Marcy giggled, admiring the way the fabric shimmered in the light.

Octavia laughed along before nodding approvingly. "Alright, we’re almost done. Now we just need to style your hair and find shoes that match. Come on, let’s go back to my room—I have everything we need there."

Marcy slipped into a pair of slippers she had found in the bathroom and followed Octavia out. As they walked, a different butler entered to collect Marcy’s school uniform for washing.

"By the way, Marcy," Octavia began, glancing at her, "my dad’s not a king like you assumed earlier. He’s still technically a prince."

"Oh, okay. Thanks for the correction," Marcy said, nodding.


Back in Octavia’s Room

Marcy sat on the edge of Octavia’s bed and unclipped her bangs again, allowing Octavia to style her hair. Since Marcy’s hair wasn’t particularly long, Octavia opted for a small, elegant bun. To complete the look, she retrieved a crescent moon-shaped hairpin from her drawer and carefully clipped it at the front.

Next came the shoes. Octavia pulled out a pair of sparkling silver heels from her closet and handed them to Marcy.

"Here, try these on," she said.

Marcy hesitated. "I don’t know, Octavia. I’m really clumsy. I might break them."

Octavia waved a hand dismissively. "It’s fine. If the heels don’t work out, I can always turn them into flats for you."

Marcy raised an eyebrow. "Let me guess, you can use magic too?"

Octavia smirked. "Bingo. I learned a few spells from my dad, so I think I can manage a little shoe transformation."

"Thanks, but I’ll test them out first," Marcy said as she slipped into the heels.

The moment she took a few steps, she wobbled unsteadily before tripping forward with a small yelp.

Octavia lunged forward and caught Marcy just in time, steadying her before she could hit the floor.

"Whew, that was close. You okay?" Octavia asked.

"Yeah. Thanks for the catch," Marcy muttered, a bit embarrassed.

"No problem," Octavia replied with a grin.

Deciding not to risk another tumble, Marcy took off the heels and handed them back. "Yeah, flats would be better."

Octavia nodded. "Alright, here goes."

Her hands glowed with a soft pinkish-purple light as she waved them over the heels, chanting a quiet spell in a foreign language. The shoes shimmered before shifting shape, shrinking down into a comfortable pair of elegant flats.

Marcy watched the magic in awe. "Whoa."

"I did it!" Octavia beamed. "Try them now."

Marcy slid the newly transformed flats onto her feet and took a cautious step. They fit perfectly—no wobbling, no tripping.

Octavia clapped her hands together. "Okay, now that you’re ready, it’s time to introduce you to my dad. I can’t wait for you to meet him."

Marcy hesitated. "I… I’m feeling a little nervous. What if I say something awkward? Or do something weird?"

Octavia placed a reassuring hand on her shoulder. "You’ll be fine. My dad is really friendly to the people around him." She then muttered under her breath with a half-annoyed, half-sad tone, "Except for Mother, but that’s just because she screams at him all the time."

Marcy caught the bitterness in Octavia’s voice but didn’t comment on it. Instead, she nodded. "Okay. Thanks, Octavia."

The two girls started making their way to the dining room, but just as they were about to enter, Marcy stopped abruptly.

"Wait! I need to get something real quick. I’ll be right back."

Octavia blinked, confused, as Marcy dashed back toward her room.

A few minutes later, Marcy returned, one hand curled into a fist. She walked up to Octavia, opening her palm to reveal two tiny golden robot pins with green eyes and small, cheerful smiles.

Marcy picked up one of the pins and gently placed it in Octavia’s hand. "Here. It’s a thank-you gift. I hope you like it."

Octavia stared at the tiny pin in surprise before a warm smile spread across her face. She pinned it onto her cardigan. "It’s adorable. I love it."

Marcy grinned. "The other one is for your dad, but… I’m still nervous about whether he’ll like me or not."

Octavia rolled her eyes playfully. "Like I said, you have nothing to worry about. Trust me." She patted Marcy’s shoulder before gesturing for them to continue forward.

Finally, the girls entered the grand dining room. Marcy's eyes widened as she took in the high ceilings, the intricate chandeliers, and the elegant furniture. But her gaze soon fixated on the tall, owl-like demon sitting in one of the grand chairs, engrossed in a book.

Octavia stepped forward. "Dad."

The owl demon looked up from his book, revealing four deep red eyes with no visible pupils. He seemed momentarily startled before relaxing, a soft smile forming on his beak. His voice, rich with a slightly high-pitched British accent, broke the silence.

"Oh, Via! Is there something you need from me, my owlette?"

The nickname was clearly one of affection, one Octavia had likely heard countless times before.

"I brought the human here to meet you, like you asked. Her name is Marcy."

Octavia gently took Marcy’s hand and led her closer to the imposing figure.

Marcy, feeling small under his towering presence, forced herself to smile. "Hello," she said, her voice quieter than she intended.

Stolas blinked before suddenly chuckling. "Oh, right! Silly me. I was so engrossed in my novel that I almost forgot we had a guest."

Closing his book softly, he removed the large black hat he wore, revealing the crown attached to it. Rising from his seat, he stepped forward, and Marcy’s jaw nearly dropped.

He was huge.

Even though he was slender, his sheer height made him feel almost otherworldly. Marcy had expected someone more muscular, but instead, Stolas had an elegant, almost regal figure—an anthropomorphic owl with a heart-shaped white facial disk, a small black beak, gray-blue feathers that darkened at the tips, and long, plume-like tail feathers. His deep red tunic, adorned with gold buttons, only added to his grand presence.

"My dear daughter has told me a great deal about you. All good things, I assure you," he said warmly.

He placed a hand over his chest and bowed gracefully. "I am Stolas of the Ars Goetia. It is a pleasure to meet you."

Marcy gulped, glancing at Octavia, who gave her an encouraging nod.

Taking a deep breath, Marcy returned the gesture with a small curtsy. "Nice to meet you too. And… thank you for taking me in, Your Highness."

Stolas let out a soft, hoot-like laugh. "Oh, no need for formalities, dear. Just call me Stolas."

Marcy smirked playfully. "Just Stolas, huh? Can I call you Stols?"

For some reason, that made him freeze...

Notes:

So, how was the story? Let me know what you think in the comments. Maybe I could make more stories like this if you guys want to.

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