First, you should focus on her character traits. Lilithmon is often depicted as a powerful and cunning character. So, you can build stories around her using these traits, like her making strategic moves in a battle or outwitting her enemies.
When writing Cersei Lannister fanfiction without inappropriate content, first consider her character traits. Her pride, ambition, and her love for her children (in her own way) are important aspects. You can build stories around her political maneuvers in King's Landing.
Characterization is key. Stay true to Natsu and Lucy's personalities as seen in the original Fairy Tail series. For example, Natsu's impulsiveness and love for food, and Lucy's determination and kind heart. This will make the story feel authentic.
The cultural and mythological context is important. In Greek mythology, their relationship was complex. Hephaestus was Aphrodite's husband, yet she had affairs. You can rewrite this in a fanfiction by having them work through their issues. For example, Aphrodite could come to appreciate Hephaestus more for his skills and loyalty, and Hephaestus could learn to trust Aphrodite again. You can also add in other mythological elements like the other gods' reactions to their relationship changes.
One interesting aspect is their divine status. Zeus as the king of the gods has power and authority, while Aphrodite has the power over love and beauty. Their interactions could be based on political intrigue within the pantheon. For example, Zeus might try to use Aphrodite's power to his advantage in some way.
First, you should focus on their personalities. Naruto is known for his determination and big heart, and Tania might have her own unique traits. Develop their relationship based on how these personalities interact. For example, if Tania is more reserved, Naruto could be the one to break the ice and bring out her more adventurous side. Also, think about the Naruto universe's lore. Incorporate elements like jutsu, the ninja villages, and the political situation to add depth to the story.
One interesting aspect is their friendship development. Hiccup is a human and Toothless is a dragon, so how they bridge the gap between their species can be a great focus. For example, they might learn each other's languages or ways of communication.
Another aspect is to respect the original source material. Keep in line with the lore and world - building of Naruto. Maybe explore how their different clans' values and abilities could play into their relationship in a non - romantic or a healthy romantic way. For instance, how Neji's Byakugan and Naruko's Nine - Tailed Fox powers could be used in a joint mission.
One aspect is to focus on their backstories. Anko was Orochimaru's student, so you could explore how that relationship started and evolved before Orochimaru's dark turn. For example, their training sessions and the skills he taught her.
One important aspect is to stay true to her character. Lily was known for her kindness and strong will. You could explore her time at Hogwarts, like her studies in Potions or Charms. Another aspect is her relationships. You could focus on her friendship with Severus Snape and how it changed over time.
You could focus on their backstories. Itachi's tragic past in the Uchiha clan and Ino's family - centered upbringing in the Yamanaka clan. How would these different backgrounds influence their relationship? Maybe they bond over the loss of family members in some way.