There are quite a few. For example, there are stories where they meet in a modern - day setting and gradually develop a relationship. The authors often explore their personalities and how they interact, which makes for engaging reading. They might be in a school or a city environment, and the story unfolds from there.
Yes, there are some really interesting ones. You can find them on various fanfiction websites. Some focus on their adventures together in a fantasy world, where Shirou's skills and Lorelei's unique abilities combine to face challenges.
Definitely. A lot of the fanfiction delves into their backstories and how they came to be the characters we know. In some, Shirou is portrayed as a more complex figure, and Lorelei has her own secrets. Their relationship in these stories can be a slow - burn, starting from a chance encounter and evolving into something deeper as they learn more about each other.