Disclaimer: This fanfiction is a creative work of fiction produced by a fan of both the Harry Potter and Marvel Cinematic Universe (MCU) franchises and is not officially endorsed by J.K. Rowling, Marvel Studios, or any affiliated parties. All characters, events, and settings from both universes are utilized in a transformative manner and should be interpreted as such. Any resemblances to actual persons, living or deceased, or real-world events are coincidental. The views and interpretations presented in this fanfiction are the sole responsibility of the author(s) and do not necessarily align with the established canons of either Harry Potter or the MCU. Reader discretion is advised as this fanfiction may explore crossover themes, character interactions, and storylines not found in the original works.

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Harry woke up to the soft morning light streaming through the curtains of Sersi's apartment in London. The events of the previous day, him discussing the Darkhold with Sersi, and the moments they had shared the night before, all seemed to merge into a serene yet charged reality. As he turned to Sersi, who was still nestled beside him, he couldn't help but feel a deep connection and an even deeper sense of responsibility.

Sersi stirred, her eyes fluttering open to meet his. She smiled softly, a mix of warmth and curiosity in her gaze. "Morning, Harry," she said, her voice still tinged with sleep.

"Morning," Harry replied, his tone tender. "Last night was... well, it was something special."

"It was," Sersi agreed, her smile widening. "But there's a lot we need to discuss. The Darkhold isn't the only concern."

Harry nodded, his expression growing serious. "I've been thinking the same. The Eternals – your fellow Eternals – could they help us with this fight against HYDRA and the dark magic they're delving into?"

Sersi sat up, drawing the sheets around her as she considered his question. "It's possible. Each of us has unique abilities and knowledge that could be invaluable. Ikaris, for instance, with his strength and ability to fly. Then there's Phastos, whose technological prowess could help us counter HYDRA's advancements. And Druig, with his mind control, could be a powerful ally against their manipulation tactics."

Harry listened intently, absorbing her words. "Do you think they'd be willing to help?"

Sersi's expression turned contemplative. "It won't be easy. The Eternals have their own missions and principles. Convincing them to intervene in human affairs, especially against a threat like HYDRA, will take some effort. But I believe it's worth trying."

Harry reached out, taking her hand in his. "We can't let HYDRA continue their plans. With the Darkhold, they could wreak unimaginable havoc. We need all the help we can get."

Sersi squeezed his hand reassuringly. "I'll reach out to them. We'll find a way to bring them into the fold."

Harry smiled, a sense of relief washing over him. "Thank you, Sersi."

Without another word, they leaned in, their lips meeting in a passionate kiss. The intensity of the moment built quickly, their connection deepening with every passing second. Just as things were about to heat up, a bright, flickering light filled the room.

Harry and Sersi broke apart, startled. Standing in the doorway was Sprite, her arms crossed and a bemused expression on her face. "Well, isn't this cozy," she remarked, her voice dripping with sarcasm.

Sersi sighed, a mix of exasperation and amusement on her face. "Sprite, don't you knock?"

Sprite shrugged, a mischievous grin spreading across her face. "Why bother when I can just pop in?"

Seeing the confusion on Harry's face, Sersi smiled and gestured towards the young-looking Eternal. "Harry, this is Sprite. She's an Eternal, just like me. Sprite, this is Harry."

Harry extended a hand, still processing the sudden interruption. "Nice to meet you, Sprite."

Sprite shook his hand with a firm grip. "Likewise. Sersi's told me quite a bit about you. It's not every day we meet someone who's both a wizard and an Avenger."

Harry chuckled. "Well, I guess I'm not your average wizard."

Sprite nodded in agreement. "Definitely not. Anyway, as I was saying, Kingo's in town. He said he has some important information about HYDRA."

Sersi's expression turned serious. "Then we shouldn't waste any time. Harry, Kingo is another Eternal. If he has information, it could be crucial."

Harry nodded, his curiosity piqued. "Let's go see what he has to say."

As they made their way to meet Kingo, Harry couldn't help but feel a surge of determination. With the Eternals' help, they stood a better chance of stopping HYDRA.

Sersi, Harry, and Sprite made their way through the bustling streets of London, heading towards Kingo's temporary residence. As they walked, Sersi filled Harry in on Kingo's background.

"Kingo's a bit of a showman," she said with a smile. "He's been living as a Bollywood star for the past few decades. But he's as dedicated to our cause as any of us."

Harry nodded, intrigued. "A Bollywood star, huh? That's quite a cover."

Sprite laughed. "You should see his movies. They're something else."

Soon, they arrived at a luxurious penthouse overlooking the Thames. Kingo greeted them at the door, his charismatic smile evident even before they entered.

"Sersi, Sprite! And you must be Harry. I've heard a lot about you," Kingo said, extending his hand to Harry.

"Likewise," Harry replied, shaking his hand firmly.

They settled into the spacious living room, and Kingo got straight to the point. "I've received some troubling news," he began, his expression grave. "Phastos and his family have gone missing."

Harry's brows furrowed in concern. "Phastos? How?"

Kingo sighed heavily. "He was contacted by someone claiming to have information about ancient artifacts. They met, and since then, there's been no word from him or his family."

Sersi's eyes widened in alarm. "Do you think HYDRA's involved?"

Kingo nodded grimly. "It's possible. I did some digging through my contacts, and it turns out the person who contacted Phastos has ties to HYDRA. This guy was one of those who had infiltrated SHIELD, and Phastos fell right into their trap."

Sersi clenched his fists, her jaw set in determination. "We need to find them before HYDRA does. Phastos is a genius with technology. If they get their hands on him..."

"We can't let that happen," Sprite interrupted, her voice firm. "Kingo, do you have any leads?"

Kingo nodded. "I've got a few contacts who might know something. I'll start reaching out to them immediately."

Harry stood up, his mind racing with possibilities. "I'll help in any way I can. We can't afford to waste any time."

Sprite's mischievous grin widened as she interjected, "Maybe it's time the rest of the Avengers met your girlfriend, Harry."

Harry blinked in surprise at Sprite's suggestion. "Uh, yeah, maybe you're right," he replied, a hint of uncertainty in his voice. "It's just... it's complicated."

But Sprite waved off his concerns with a casual flick of her hand. "Nonsense! They'll love her. Besides, it's not every day you get to date an Eternal, right?"

Harry chuckled nervously, realizing that Sprite was right. It was time for Sersi to meet the rest of the team, whether he felt ready for it or not.

The Avengers gathered at the Avengers Tower, anticipation crackling in the air as they awaited the arrival of Harry's girlfriend, the Eternal Sersi. Harry stood by nervously, unsure of how his teammates would react to meeting someone from his otherworldly life.

As the elevator doors slid open, revealing Sersi standing gracefully within, the Avengers couldn't help but stare in awe at her radiant presence. Her beauty and aura of power were unmistakable, commanding the attention of everyone in the room.

"Wow," Tony muttered under his breath, his eyes widening in astonishment.

Sersi approached Harry with a warm smile, her hand reaching out to intertwine with his. "Hello, everyone," she greeted the group, her voice gentle yet imbued with an otherworldly charm.

Captain America stepped forward, extending his hand in greeting. "It's a pleasure to meet you, Sersi. Harry's told us a lot about you."

Sersi returned the handshake with a gracious nod. "The pleasure is mine," she replied, her gaze sweeping over the assembled Avengers with a mixture of curiosity and warmth.

Thor, having just returned from Asgard, stepped forward with his customary grandeur, a wide grin spreading across his face. "Greetings, Lady Sersi!" he boomed, his voice echoing through the room with the authority of a king. "'Tis an honor to welcome thee to our humble abode."

Sersi's smile brightened at Thor's theatrical greeting, a spark of amusement dancing in her eyes. "Thank you, Thor," she replied graciously, her voice carrying a musical lilt. "I'm delighted to be here."

Thor, ever the embodiment of chivalry, bowed deeply in response, his cape billowing behind him like a regal banner. As he straightened, a sense of camaraderie filled the room, bridging the gap between realms and uniting them in a shared sense of purpose.

Tony, always one to cut to the chase, couldn't resist the opportunity to satisfy his curiosity. "So, Sersi," he began, a playful twinkle in his eyes, "what's your 'shtick,' exactly?"

Sersi, unfazed by Tony's casual demeanor, met his gaze with a knowing smile. "Well, Mr. Stark," she replied with a hint of amusement, "let's just say I have a few tricks up my sleeve."

Tony, never one to pass up an opportunity for a demonstration, raised an eyebrow inquisitively. "Care to give us a little preview?" he asked, his tone tinged with curiosity.

Sersi's smile widened at Tony's request, a playful glint dancing in her eyes. With a graceful flick of her wrist, she summoned a small orb of shimmering energy, holding it aloft in her palm.

"Behold," she declared with a flourish, "the power of an Eternal."

The orb danced and shimmered with an ethereal glow, casting patterns of light and shadow across the room. Tony watched in awe, his usual wit momentarily silenced by the display of mystical prowess before him.

"Very impressive," he remarked, unable to hide his admiration. "I can see why Harry's so smitten."

Sersi chuckled softly at Tony's comment, the orb dissipating into a trail of sparkling motes. "Thank you, Mr. Stark," she replied graciously. "I assure you, the feeling is mutual."

Captain America's authoritative voice cut through the momentary distraction, redirecting everyone's focus back to the task at hand. With a commanding presence, he turned to Harry and Sersi, his blue eyes locking onto theirs with unwavering intensity.

"Harry, Sersi," he began, his tone firm yet respectful, "what's our next move? What's the mission?"

Harry and Sersi exchanged a brief glance, a silent communication passing between them before Harry nodded, indicating for Sersi to take the lead.

"Our mission," Sersi replied, her voice steady and composed, "is to locate and neutralize the Hydra operative responsible for the disappearance of Phastos and his family. We need to act swiftly and decisively to ensure their safety and prevent Hydra from obtaining any more valuable assets."

Sersi's words carried a weight of responsibility as she delved into the significance of Phastos' contributions to humanity. With a calm demeanor, she outlined Phastos' remarkable abilities and his pivotal role in mankind's technological advancements, including the development of the atomic bomb. As she spoke, Tony's expression shifted from curiosity to awe, his eyes widening in realization of the magnitude of Phastos' impact on history.

"Phastos," Tony murmured, his voice tinged with a mix of admiration and reverence. "I had no idea..."

Sersi nodded solemnly, her gaze meeting Tony's with understanding. "His intellect and ingenuity have shaped the course of human civilization," she affirmed. "But now, his brilliance has made him a target for Hydra. We must act swiftly to ensure his safety and prevent Hydra from exploiting his knowledge for their own nefarious purposes."

Tony nodded in agreement, a newfound determination settling over him. "Consider it done," he declared, his voice resolute. "We'll find Phastos and bring him home."

With a unified sense of purpose, the Avengers rallied together, their resolve strengthened by the gravity of the mission ahead. As they prepared to embark on their next challenge, the weight of responsibility hung heavy in the air, driving them forward in their pursuit of justice and protection for their fellow allies.

Natasha swiftly reached out to Fury, initiating the process of tracking down the Hydra operative responsible for Phastos' disappearance. Meanwhile, Tony and Clint couldn't resist taking a playful jab at Harry's newfound romance with an Eternal.

"So, Harry," Tony began with a mischievous twinkle in his eye, "did you have to use any magic tricks to win her over, or did you charm her the old-fashioned way?"

Clint chuckled, adding fuel to the teasing. "Yeah, did you sweep her off her feet with your wizardry, or was it just your dashing good looks?"

Harry chuckled at their teasing, his expression playful yet tinged with a hint of mischief. "Well, you know," he began, his tone conspiratorial, "I may have a way with words that some find... enchanting."

Tony raised an eyebrow, intrigued. "Oh, really? And what exactly do you mean by that?"

Harry's grin widened as he leaned in closer, his voice dropping to a whisper. "Let's just say I have a certain... talent for speaking Parseltongue."

Clint's eyes widened in surprise, while Tony's expression shifted to one of curiosity. "Parseltongue? As in, the language of snakes?" Tony asked, his interest piqued.

Harry nodded, his grin turning mischievous. "That's right. Turns out, it's not just snakes who find it intriguing," he replied with a wink, leaving his friends to ponder the implications of his unique ability.

As they shared a knowing look, the conversation shifted back to their mission, but the revelation lingered in the air, adding an extra layer of intrigue to Harry's mysterious allure. With a newfound sense of camaraderie, they prepared to face the challenges ahead, united by their shared bond and the knowledge that together, they were capable of overcoming any obstacle that came their way.

Natasha stood before the team, her demeanor composed yet determined as she briefed them on the Hydra operative they were tasked with locating.

"Alright, team," she began, her voice steady and commanding. "Our target is a Hydra operative known as Ivan Petrov. He's a high-ranking member of the organization and has been linked to numerous covert operations, including the recent disappearance of Phastos and his family."

She gestured to the screen behind her, where images of Petrov flashed across the display. "Petrov is cunning and resourceful, with a penchant for staying one step ahead of his adversaries. We believe he's currently operating out of a Hydra stronghold in Eastern Europe, but his exact location remains elusive."

Natasha paused, her gaze sweeping over the assembled Avengers. "Our objective is simple: locate Petrov, apprehend him, and extract any information he may have regarding Phastos and Hydra's activities. Time is of the essence, so we need to move quickly and efficiently."

Captain America locked eyes with each member of the team in turn. "Let's show Hydra that they can't hide from us. We're the Avengers, and we'll stop at nothing to bring them to justice."

The Avengers spring into action, each member preparing for their respective roles in the mission to locate and apprehend Ivan Petrov. Harry confers with Sersi, utilizing her knowledge of ancient artifacts and mystical energies to aid in their search.

Meanwhile, Natasha coordinates with Fury and SHIELD, leveraging their resources to track Petrov's movements and gather any intel that could lead them to his location. Tony, Clint, and Thor prepare the Quinjet for departure, ensuring they have all the necessary equipment and firepower to confront Hydra's stronghold.

As the team finalizes their preparations, tension hangs in the air, a palpable anticipation of the dangers that lie ahead.

Natasha's expertise and resourcefulness prove invaluable as she swiftly tracks down the location of Ivan Petrov, the Hydra operative responsible for the disappearance of Phastos and his family. Utilizing her extensive network of contacts and surveillance techniques, Natasha pinpoints Petrov's whereabouts to a remote Hydra facility hidden deep within the Siberian wilderness.

With the target identified, the Avengers waste no time in formulating a plan of action. Natasha relays the coordinates to the team, providing them with the crucial information they need to launch their assault on the Hydra stronghold.

As the Quinjet hurtles towards its destination, anticipation mounts among the Avengers, each member bracing themselves for the imminent confrontation with Hydra. With Natasha leading the charge, the team is poised to strike with precision and determination, ready to bring Petrov to justice and rescue Phastos and his family from Hydra's clutches.

Sersi wastes no time in calling for reinforcements, enlisting the aid of Kingo, Gilgamesh, and Makkari to bolster the Avengers' ranks for the impending mission. With their unique abilities and formidable skills, the Eternals add a powerful advantage to the team, enhancing their chances of success against Hydra's forces.

As the Quinjet approaches the Hydra facility, the Avengers brace themselves for the confrontation ahead, their resolve strengthened by the addition of their new allies. With Kingo, Gilgamesh, and Makkari by their side, they stand ready to confront Ivan Petrov and rescue Phastos and his family from Hydra's grasp, no matter the cost.

As Harry prepares for the mission alongside the Avengers and the Eternals, he reaches out to the Maximoff twins, Wanda and Pietro, who have been harboring their own grudges against Hydra. Despite their past conflicts with Tony Stark, they recognize the greater threat posed by Hydra and are eager to join forces with Harry in taking them down.

With Wanda's formidable powers of chaos magic and Pietro's superhuman speed, the Maximoff twins bring a valuable asset to Harry's team, enhancing their capabilities and bolstering their chances of success against Hydra's forces. As they rendezvous with Harry and the others, the Avengers welcome the twins into their ranks, united in their mission to stop Hydra and protect innocent lives from their sinister schemes.

As the Avengers gathered in the meeting room, tensions simmered beneath the surface, especially between Tony Stark and the Maximoff twins, Wanda and Pietro. Tony's gaze lingered on the twins, his expression guarded, while Wanda and Pietro stood with a stoic resolve, their distrust palpable.

Harry, sensing the tension, cleared his throat, breaking the uneasy silence. "Alright, everyone, let's focus on the task at hand," he urged, his voice firm yet diplomatic. "We have a Hydra operative to apprehend, and we need to work together to ensure the mission's success."

Wanda and Pietro exchanged a glance, their unease evident, but they remained silent, their attention fixed on the mission ahead. Tony, though visibly uncomfortable, nodded in agreement, begrudgingly acknowledging the necessity of cooperation.

Sersi, trying to diffuse the tension, turned to Gilgamesh, gratitude evident in her eyes. "Thank you for being here, despite Thena's condition," she said sincerely, her voice tinged with appreciation. "Your presence means a lot to us, and I know she would be grateful too if she were here."

Gilgamesh nodded solemnly, his expression reflecting his concern for Thena. "I couldn't leave you all to face this alone," he said, his voice steady with determination. "We'll get through this together, no matter what."

Harry, having heard about Thena's condition from Sersi, feels a sense of déjà vu washed over him. The symptoms, the confusion, and the disorientation eerily mirrored the ordeal Bertha Jorkins endured after being obliviated multiple times. It was a troubling similarity that sent a chill down Harry's spine.

However, he pushed aside his personal unease, recognizing that dwelling on it wouldn't aid their current mission. Instead, he focused on the immediate task at hand, his mind sharpening as he prepared to confront the Hydra operative and ensure the safety of Phastos and his family.

Tony, ever the conversationalist, couldn't resist engaging the Eternals in conversation as they boarded the Quinjet. "So, Eternals," he began with his trademark charm, "what's life like living forever? Must get boring after a while, right?"

Sersi, accustomed to such inquiries, offered a polite smile. "It's certainly had its ups and downs," she replied diplomatically, "but we've found ways to keep ourselves occupied."

Kingo, always one for a bit of humor, chimed in, "Yeah, like watching humanity stumble through history. It's like reality TV, but with fewer Kardashians."

Tony chuckled at the jest, impressed by the Eternals' ability to maintain their sense of humor despite their ancient age. "Fair point," he conceded, "though I'm sure there are some perks to immortality that we mere mortals can only dream of."

Kingo leaned back, a smirk on his face. "Well, there's definitely the perk of never having to worry about wrinkles or grey hair. Plus, we get to witness the evolution of fashion firsthand. Some eras were definitely better than others."

Tony nodded, intrigued. "So, what's the worst fashion trend you've seen?"

Sersi laughed softly. "Oh, there were quite a few, but I think the powdered wigs of the 18th century were pretty dreadful. They were itchy and impractical, but people loved them."

"Yeah," Kingo added, "and let's not forget the disco era. Those platform shoes were a nightmare. Makkari actually tripped over a few times."

Makkari, who had been silently observing, signed something, and Sersi translated with a chuckle. "She says she tripped on purpose just to make the rest of us laugh."

Tony grinned, then glanced at Gilgamesh. "What about you? Any particularly memorable moments from history?"

Gilgamesh looked thoughtful. "I think the most memorable moments are the ones where humanity showed its resilience. Surviving plagues, wars, natural disasters—those are the times when you see the true strength of people. It's inspiring."

Tony nodded, appreciating the depth of Gilgamesh's answer. "Yeah, I can see that. What about modern times? Anything stand out to you guys?"

Sersi's expression grew more serious. "The rapid advancement of technology has been astonishing. Phastos has played a big role in that, as you know. But with progress comes new dangers, like HYDRA. That's why we're here, to help protect humanity from those who would use that progress for evil."

Tony glanced at Wanda and Pietro, who were listening intently. "Speaking of HYDRA, I just want to say—"

Wanda cut him off, her tone icy but controlled. "We know, Stark. We're here to fight HYDRA. Let's focus on that."

Tony nodded, respecting her resolve. "Right. We're all on the same side here."

Pietro, sensing the tension, added, "We're ready to do what needs to be done."

Harry, watching the exchange, stepped in to defuse the moment. "We have a common goal. Let's make sure HYDRA pays for everything they've done."

The rest of the flight passed with a renewed sense of camaraderie and purpose. The Avengers and the Eternals, despite their differences, were united in their mission to bring down HYDRA and protect the world from its insidious plans. As the Quinjet sped toward their destination, the team prepared for the challenges ahead, ready to face whatever dangers awaited them.

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