Many fanfictions explore their relationship by showing their daily life. For example, they might show how Saber and Shirou communicate in the morning, like Saber making tea while Shirou reads the news. It gives a sense of normalcy to their relationship.
Some fanfictions focus on their emotional connection. They might have scenes where Shirou comforts Saber after a bad dream about her past. This shows how they are there for each other and how their relationship has grown deeper. Also, the way they make decisions together in the fanfictions reflects on their mutual respect and love. For instance, when they are deciding on redecorating their house, they listen to each other's ideas carefully. In some fanfictions, their relationship is also explored through how they deal with jealousy. If someone shows interest in Shirou, Saber's reaction and how they resolve the situation is an important part of showing their relationship.