Another theme is redemption. Itachi, in particular, has a lot of room for redemption arcs in these fanfictions. His actions in the original series can be re - examined and re - shaped in the context of his relationship with Naruto and Sasuke. Also, friendship evolving into something deeper is a big theme. Naruto and Sasuke's friendship is a central part of the original Naruto story, and in these yaoi fanfictions, it can take on new dimensions when Itachi is added to the mix. They all support and challenge each other, which is a recurring idea in many such fanfictions.
Reconciliation is a big theme. Itachi and Sasuke's relationship is often at the center of this. Naruto can be the catalyst in these stories, helping them to reconcile their differences. There are also themes of sacrifice, as Itachi has already sacrificed a lot in the original story, and fanfictions may expand on this concept in relation to all three characters.
The theme of mutual understanding also prevails. Naruto and Itachi come from different generations and have had very different experiences. In the yaoi fanfiction, they learn to understand each other on a deep level. They share their pain, their dreams, and their fears, which helps in strengthening their bond. This is often shown through long conversations and shared moments of vulnerability.
One common theme is redemption. Itachi has a lot of guilt in his past, and in these fanfictions, Naruto can often be the one to help him find redemption. For example, Naruto's belief in people's good nature can make Itachi see himself in a new light.
One common theme is the exploration of their relationship in a new context. With the mpreg aspect, it often delves into how they deal with the unexpected situation together. Another theme could be the challenges they face from their friends or the ninja community due to their relationship and the mpreg.
One common theme is the struggle between love and power. Since Itachi is a vampire, he often has to balance his newfound power with his love for Sasuke. Another theme is the idea of forbidden love, as their relationship might be seen as taboo in the context of vampire and human (or in this case, another Uchiha).
There is a fanfiction named 'Three Souls United'. In this story, the author beautifully weaves the stories of Itachi, Naruto, and Sasuke together. It focuses on their shared experiences, their struggles, and how their feelings for each other gradually change from mere comradeship to something more profound, all while staying true to the essence of the characters.
One common theme could be the exploration of their complex relationship. Since they are both characters from Naruto, their different personalities and goals might be explored in an interesting way in such fanfictions.
A prevalent theme is redemption. Sasuke has a complex past, and in these fanfictions, his relationship with the OC can be a part of his journey towards redemption. Also, the theme of acceptance is quite common. They have to accept their feelings for each other, especially considering the nature of yaoi relationships in the Naruto - inspired setting.
Another theme is redemption. Itachi has a lot of actions in his past that need redemption, and in these fanfics, his relationship with Sasuke and Naruto can be a part of that journey. Like, his actions towards Sasuke are re - evaluated in the context of a new understanding among the three.
The theme of sacrifice also often appears. Itachi sacrificed a great deal for Sasuke and the village. Fanfics might expand on this, like showing how Sasuke comes to fully understand and appreciate Itachi's sacrifices, and how that understanding changes their relationship.