Well, often in these types of fanfictions, a theme of intimacy can be explored. Not just in a physical sense but also an emotional one. Saber being in such a state around Shirou can lead to moments of intense connection and understanding between them. It might also touch on the theme of acceptance, with Shirou accepting Saber in this rather unexpected and perhaps uncharacteristic state.
It adds a new dimension to the characters. It shows different sides of Saber and Shirou that we might not see in the original work. This can make fans more interested in exploring their relationship further.
Love is a very common theme. Their relationship, which was complex in the original work, is often explored more deeply in fanfiction, showing different aspects of their love for each other.
Another theme is the struggle against fate. In many fanfics, Saber Alter and Shirou find themselves having to fight against the pre - determined path set by the original 'Fate' storyline. They try to create their own future together, which makes for an exciting and engaging read.
Another theme could be redemption. Maybe Shirou as a Dead Apostle is seeking redemption through his relationship with Saber. And Saber might be trying to save him from his dark path. It's also common to see themes of forbidden love, as their natures seem so different that their relationship might be seen as something not allowed in the normal Fate world order.
One common theme is love. Their relationship is often explored in different ways, from a slow - burn romance to an instant connection. Another theme is loyalty. They are both loyal characters, and in fanfiction, this loyalty is often tested and reaffirmed.
Character development is crucial too. If the fanfiction shows how Saber and Shirou have grown as individuals and as a couple, the kiss becomes more meaningful. It could be that through various trials, they have come to understand and love each other more deeply, and the kiss is a physical manifestation of that.
One common theme is sacrifice. Shirou is often willing to sacrifice himself for Saber, and vice versa. It shows the depth of their love.
Growth is also a prevalent theme. Both characters grow as individuals within their marriage. Shirou might become more confident and assertive, while Saber may learn to be more open and emotional. This is often shown through various events in their married life in the fanfiction, like dealing with financial issues or making big decisions together.
There's 'Destiny's Threads'. In this fanfiction, it focuses on an alternate timeline where Saber and Shirou face different challenges together. It's really interesting as it shows their characters adapting to new situations while still maintaining the core of their relationship.
One popular theme is the exploration of their relationship in alternate universes. For example, in some fanfictions, they might be in a modern setting rather than the original Fate/stay night universe. Another theme could be the growth of their bond through various challenges. They might face new enemies together, which deepens their connection. Also, the theme of self - discovery within their relationship is common. As they interact more, they learn more about themselves and what they truly want from each other.