Itachi Uchiha, the heartthrob of Hogwarts, was seated at the staff table in the Great Hall, his eyes festive amidst the cheers of the students. Though he was new, he was already adored.

Luna Lovegood strolled into the hall, her usual dreamy gaze replaced with a look of excitement. Spotting Itachi, Luna rushed to his side, their shared life as spouses bringing them closer.

The atmosphere in the Great Hall suddenly darkened, a chilling wind blew causing the candles to flicker. The grand doors burst open revealing the infamous Dark Lord, Voldemort.

"Who is he?" Itachi questioned, looking at the sickly figure. Luna sighed, "That's the Dark Lord, Voldemort. He's been a menace to our world for years."

"It's been so long, hasn't it, Potter?" Voldemort sneered, his gaze resting on a now standing Harry Potter. Harry merely clenched his fist, responding, "I'm going to stop you."

However, before Harry could make a move, Itachi calmly stood. His eyes shifted colours, showing intricate designs. "Universal Pull" he announced, his voice thunderously calm.

Voldemort was unexpectedly dragged towards Itachi. With a swift motion, Itachi sealed the Dark Lord in his Totsuka blade. The hall fell into absolute silence, shocked by the sudden turn of events.

"There, I finished your job," Itachi nonchalantly said to Harry. Harry blinked, taken aback for a moment, then replied "Uh, thank you, Itachi." A sense of relief filled the air.

"I'm just tired of snake people ruining people's lives," Itachi added, causing a small wave of laughter to ripple through the hall. The tension was finally lifting.

Harry looked thoughtful. "Wait, you had someone like Voldemort?" Luna nodded, "Yes, that's Orochimaru. He tried to steal Itachi's body to gain his power."

Itachi sighed, "The first time we met, I cut off his arm. The second time I sealed him away. The third time I released him to help me stop Madara and Obito."

"Madara? Obito?" Harry questioned, unfamiliar with the names. Itachi nodded, "Madara is my ancestor and Obito is my cousin. Both of them were a threat to my world."

"Orochimaru ended up helping us because he wanted to know what path I would choose instead of what was set for me," Itachi finished, his gaze distant but satisfied.

The students absorbed this tale, finding similarities between Itachi's world and theirs. Both had faced great threats, and both had overcome them.

The noise eventually returned to the Great Hall as the students began to talk amongst themselves. The anticipation of the evening turned into respect and admiration for Itachi.

Looking at her husband, Luna thought about his strength and kindness. Itachi always believed in peace and had taken on burdens for the sake of others.

Harry watched Itachi, realising that the wizarding world was not alone in battling evil. He felt a bond, a connection with Itachi, understanding his courage and determination.

Itachi glanced around the Great Hall, at the faces filled with relief, respect, and admiration. He had not just defeated a threat but also instilled hope and courage.

Luna held Itachi's hand, with love and pride in her eyes. Itachi looked at Luna, a slight smile gracing his usually solemn face. Today had been a victory worth remembering.

Harry stood up, raising his glass. "To Itachi Uchiha," he said, everyone echoed his words, raising their glasses in unison. The toast marked the end of an extraordinary evening.

Itachi merely nodded, acknowledging the gesture. His actions were not for recognition but for the preservation of peace. Yet, he appreciated the warmth and support.

Once the students returned to their dorms, the staff members congratulated Itachi. The opinions of the others had changed, not just seeing him as a heartthrob but a hero.

Luna softly kissed Itachi's cheek, "I'm proud of you," she murmured, her voice filled with genuine love and respect. Itachi turned towards her, his eyes softening.

Harry shook Itachi's hand, thanking him once more for his bravery. Itachi graciously accepted his gratitude, pleased to have brought peace to another world.

The night ended on a positive note with Itachi Uchiha, the heartthrob of Hogwarts, now also known as the saviour. He had brought peace, and with it, hope.

The following day, the events of last night seemed like a dream to many. But the sense of safety that now lingered proved it was not only a reality but a victory.

Luna woke up, looking at Itachi peacefully sleeping next to her. She felt a surge of gratitude, knowing he had saved not one but two worlds from evil.

Harry sat by the window, watching the sun rise. The day felt different, safer. Itachi had left an unforgettable impact, his actions resonating throughout Hogwarts.

Students would now walk past Itachi, looking at him with awe and respect. The heartthrob had become a hero, his bravery giving everyone a sense of security.

Itachi Uchiha, a shinobi from a different world, had saved the wizarding world. He was the heartthrob, the saviour, the husband, and most importantly, a symbol of hope.

Hogwarts had gained a new story to tell, a new hero to revere. Luna Lovegood had gained a courageous husband, and Harry Potter had found an unexpected ally.

Itachi Uchiha's journey from the heartthrob of Hogwarts to its saviour was a tale that would be etched in the annals of the school's rich and varied history.

The battle of Hogwarts was won, not by magic, but by the brave heart of a shinobi. Itachi Uchiha, the heartthrob, had become Itachi Uchiha, the hero.

As time moved on, Itachi's story lived on, his bravery inspiring young wizards and witches. The heartthrob of Hogwarts had indeed left an unforgettable legacy.

If anyone asked about the legend of Hogwarts, the tale of Itachi Uchiha would be narrated with pride. The heartthrob had truly become the heartbeat of Hogwarts.