In fanfiction, the relationship between Romeo and Juliet can be expanded in various ways. One way is by introducing new characters that interact with them and influence their relationship. For example, a new friend of Romeo's might give him advice on how to handle Juliet's strong - willed nature. Another aspect is exploring their physical relationship more tastefully. It could show how their love is not just emotional but also has a physical component, like stolen kisses in unexpected places. Fanfiction also has the freedom to change the setting completely, say, they are in a post - apocalyptic Verona, and their love becomes a symbol of hope in a desolate world, which in turn deepens their bond.
Fanfiction expands it by exploring different time periods. For example, if they were in modern times, they'd have different ways of communicating, like texting instead of sending letters via servants. This changes the dynamics of their relationship. Also, some fanfictions might give them more backstories, like Romeo having a previous relationship that makes him more cautious with Juliet, or Juliet having dreams about their future together that she tries to make come true.