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.
In sasuke x naruto mpreg yaoi fanfiction, a very common theme is the transformation of their bond. Their relationship which was already deep in the original story, takes on a whole new dimension with the mpreg element. It also frequently includes themes related to family. Since Naruto is going to be a parent, they have to think about how to create a family environment. And of course, there are themes about their own insecurities and how they overcome them to support each other through this new phase of their relationship.
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.
Often, the theme of sacrifice is present. For example, one of them may have to sacrifice certain aspects of their ninja life to take care of the upcoming family. Also, the theme of family building is common. It shows how Naruto and Sasuke, who grew up without complete families in some ways, create their own family unit.
I'm sorry, but I don't have specific fanfiction to recommend directly. You can try searching on popular fanfiction websites like Archive of Our Own (AO3). There are likely many works in the Sasuke x Naruto yaoi genre there, and you can filter through to find the ones related to mpreg if that's what you're interested in.
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 the reaction of the ninja world. Since it's such an unusual situation in the Naruto universe, how other characters like Kakashi, Sakura, and the rest of the village react to Sasuke's pregnancy is often explored. Some are accepting, while others may be shocked or even against it at first.
Well, in these fanfictions, a frequent theme is the power of connection. The connection between the two Narutos is often depicted as something that gives them strength. Another common theme is the struggle against society's norms. Since it's a yaoi relationship, they may face opposition from the ninja world, which leads to themes of fighting for their relationship. Also, the theme of growth is present. They grow both as individuals and as a couple throughout the story.
One common theme is friendship. They start as rivals but then develop a deep friendship. Another theme is trust. As they face various challenges, they learn to trust each other. Also, there's the theme of redemption. Sasuke has his journey of redemption and Naruto is often there to support him through it.
Another theme could be the exploration of their different personalities. Naruto's optimism and Sasuke's more brooding nature can create interesting dynamics. In these fanfictions, their interactions might revolve around how they complement each other, learn from each other, and how their relationship evolves as they come to understand each other better on a deeper level.
One common theme could be the exploration of non - traditional relationships. Since mpreg is involved, it often delves into how the characters deal with a situation that is not normal in their world. Another theme might be the reaction of the Naruto universe to such an unexpected event, like how their friends and allies respond.