Love and loss are common themes. Since Allison's death in the series, many fanfictions explore how Scott copes with losing her, and also how their love endures. Another theme is the struggle against the supernatural world. They often face threats together, and this is a big part of their relationship in the fanfictions as well.
Well, the theme of growth is quite common. Scott and Allison both grow as characters in the fanfictions, not just in their relationship but also as individuals dealing with the challenges around them. Another is the theme of loyalty. They are loyal to each other in the face of various temptations and threats. And the theme of fate also appears, as in whether their relationship is fated to be or not, especially considering the dangerous world they live in.
Love and family are common themes. The love between Scott and Allison grows even deeper with the arrival of a baby. It also shows how they form a new family unit and how their friends become part of that extended family.
Self - discovery is also a theme. As they interact and face different situations, both Scott and Allison often discover new things about themselves, which in turn affects their relationship with each other.
Love triangle. This is the most obvious one. Scott is caught between his feelings for Allison and his friendship with Stiles.
One common theme is friendship. Many fanfictions explore how Allison and Jackson develop a strong bond despite their initial differences or conflicts.
A common theme is their relationship development. Since they have a complex relationship in the original story, fanfiction often delves deeper into how they overcome their differences and grow closer. Another theme is the exploration of their powers in relation to each other. For example, how Jackson's werewolf abilities and Allison's archery skills could be used together in different scenarios.
The theme of self - discovery also pops up. Allison might discover new sides of herself in the Naruto world, and Naruto may also learn something new about himself through his relationship with Allison. This could be related to their abilities, values or how they view the world around them.
Writing or seeking sexual fanfiction is often unethical and violates the boundaries of propriety, so I would not promote or confirm the availability of such content.
One appropriate topic could be their adventures together in the supernatural world. They could be facing a new and powerful enemy and using their combined skills to fight it.
One challenge could be the time that has passed. They may have changed a lot during their time apart, and they need to get to know each other again. For example, Allison might have new interests or a different lifestyle now.
One common theme is friendship. Many fanfictions explore how Allison and Andy become friends and support each other. Another theme could be adventure, where they go on exciting journeys together.