"Okay Luna, follow the hand signs," said Itachi. Luna did as instructed. "Summoning jutsu," said Luna. A rift opened, and then a white serpentine dragon flew out. It had angelic wings and its body was adorned with gems that had all the colors of the rainbow.

"No...that!" Itachi exclaimed. Luna turned to him, confused. "What is it, Itachi?" Luna inquired. Itachi's eyes were wide in awe and fear. "That's the Gem God Rainbow Dragon, the leader of the crystal beasts," Itachi explained.

"Itachi, summon your dragons too," said Luna, excitement in her voice. Itachi nodded. "Alright, come forth, Deep-Eyes White Dragon & Gandora-X the Dragon of Demolition," Itachi commanded, his voice echoed through the quiet of the grounds.

Deep-Eyes White Dragon's five dazzling wings spread wide, and its halo shimmered in the sunset. Gandora, with its ebony steel body, reflected the sky and the red orbs on its body glowed to life.

The sight of the three giant dragons shocked both teachers and students alike at Hogwarts. They watched in disbelief as these colossal beasts patrolled the skies.

Professor McGonagall had been observing the scene from a distance. With a grave expression on her face, she decided to approach Itachi and Luna. "What is the meaning of this?" she demanded.

"Professor, we're just practicing some new charms," Luna answered innocently, while Itachi nodded in agreement. McGonagall squinted her eyes suspiciously but said nothing further.

Luna scanned the sky; the gem-encrusted dragon was circling above, casting a multicolor shadow on the earth. "What do we do now, Itachi?" Luna asked, her voice echoing around them.

"We need to guide them back to their world. The energy these creatures possess is too great for this world to handle," Itachi explained, observing the dragons with a stern look on his face.

Luna nodded, determination set in her eyes. "What's the plan then?" she asked. Itachi looked at her and said, "We need to perform the reversal summoning jutsu, but it won't be easy."

"Now, Luna, concentrate," Itachi began. "We have to align our chakra with theirs. Only then can we guide them back." Luna closed her eyes and focused, her hands forming the intricate signs.

As both Luna and Itachi began their incantations, the dragons started to act restless. Their eyes were drawn to the pair performing the unfamiliar hand motions. "Now, Luna!" Itachi called.

"Reversal Summoning Jutsu!" She shouted, her voice echoing through the silent evening. The dragons roared as they were engulfed in a bright light, and then they disappeared back into their world.

A moment of silence followed their departure, before the Hogwarts community erupted into applause. Luna and Itachi shared a satisfied smile. "Well done, Luna," Itachi praised.

That night, they celebrated with a feast in the Great Hall. Word had spread quickly throughout the school about the colossal dragons and Luna and Itachi's impressive display of magic and control.

Over the next few days, the event became the talk of the school. Students who had missed the spectacle were eager to hear every detail while those who had witnessed it retold the story with excitement.

Luna and Itachi became even more inseparable than before. They spent their time practicing more advanced summoning techniques, always under the watchful eyes of their professors.

Luna found herself enjoying the company of Itachi more and more. She admired his expertise and knowledge about magic and summoning techniques. She was eager to learn from him.

"Keep going, Luna, you're getting better," Itachi encouraged as they practiced their summoning techniques one sunny afternoon. Luna smiled at his words, feeling proud of her progress.

Over the weeks, Luna's proficiency in summoning increased significantly. She could now summon minor creatures with ease. Itachi was proud of her progress and praised her efforts.

The professors at Hogwarts were also impressed with Luna's progress. They appreciated the hard work and dedication Luna was putting into her studies and the results were evident.

Luna and Itachi's friendship grew stronger. They spent most of their time together, practicing jutsus, studying or just enjoying each other's company. Their bond was obvious to everyone.

Despite the awe and fear that the colossal dragon incident initially inspired, it eventually became a cherished memory for both Luna and Itachi. They often recounted the event with fond smiles.

Years later, Luna and Itachi would still talk about that day. The experience brought them closer, and they continued to grow together, exploring the wonderful world of magic, jutsus, and dragons.

As they sat together, reminiscing about the past, Luna leaned into Itachi's side. "We've come so far, haven't we?" she asked. Itachi wrapped his arm around her shoulder, "Yes, we have."