Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfictions for various shows, including 'The Night Shift'. Just use their search function to look for Drew and Rick related stories.
You can try websites like Project Gutenberg. Although it mainly focuses on classic literature, it might have some shape shifter - related works that are free. Another option is to look on some indie author platforms where they sometimes offer their shape shifter novels for free to gain readership.
The 'shift in science fiction' could refer to many things. It might be a shift in themes, like moving from exploring outer space to more internal, psychological or social issues within a science - fictional setting. For example, early science fiction was often about adventures in space, but now it may focus on how technology affects human relationships.
Shifting to a fictional reality can be achieved through various means. One way is by reading or writing fictional stories that allow you to immerse yourself completely in the created world. Another approach could be through role-playing or creating virtual scenarios in your thoughts. It requires a lot of creativity and the ability to suspend disbelief.
Honestly, it's all in your mind. You need to focus intensely on the details of the fictional reality, build a strong mental connection with it, and kind of 'transport' your consciousness there. It takes practice and a lot of creativity. But it can be a fun and rewarding mental exercise.
History can shape a story by providing a backdrop and context. It gives characters and events a sense of place and time, influencing their motivations and actions.