Love and sacrifice could be a theme. Spike might have to sacrifice something for the person he or she loves.
The theme of identity could also be present. Spike's identity might be shaped or re - defined by the love he or she experiences. It could be that through love, Spike discovers new things about himself or herself, like hidden strengths or weaknesses, and this discovery is an important aspect of the overall love story.
Another possible theme is growth. In the context of a love story, Spike could grow as a person because of the relationship. For example, he or she might become more understanding, patient or brave. This growth can be a central part of the story as it shows how love can transform a character.
Another theme might be friendship and forgiveness. His friends would probably have to deal with his greed and decide whether to forgive him and help him change.
Another theme is the idea of discovery. In many fanfictions, they discover new aspects of themselves and each other through their relationship. For example, Twilight might discover a more carefree side of herself with Spike, and Spike might learn about more complex emotions and ideas through Twilight.
One common theme is the exploration of their different personalities. Spike is often seen as more laid - back while Ember is fiery. Their relationship development based on these contrasting traits is a popular theme.
A third theme might be the pursuit of dreams. If one or both of the lovers had big dreams, like traveling the world or becoming an artist, their love would be intertwined with their individual pursuits. They might have to choose between love and their dreams or find a way to make both work in the context of their relationship.
One possible theme could be sacrifice. In 1941, during the war, lovers might have to sacrifice their time together, or one might sacrifice their safety for the other. Another theme could be hope. Despite the dark times of war, their love could be a source of hope for a better future.
One possible theme could be nostalgia. Since it's related to 1989, it might evoke a sense of longing for the past, especially for the time when the love story took place.
In a 2023 love story, the theme of second chances might be present. Maybe someone had a bad breakup in the past and in 2023, they meet someone new who gives them a chance to love again. Technology can also be a theme. People might have met through a dating app in 2023 and their relationship developed from there. And of course, the theme of family could be there. A couple in 2023 might be building a relationship with an eye towards starting a family in the future, so they are learning to support and care for each other like a family unit.
One possible theme could be social change. In 1950, society was evolving, and a love story might have been influenced by new social norms. Another theme could be sacrifice. The lovers may have had to sacrifice personal desires for each other or for their families.
Another theme could be hope. People in 1948 were looking forward to a better future after the destruction of the war. So the love between two people could represent the hope for a new start, both in their personal lives and in the broader context of the world around them. It could also be about the theme of change. 1948 was a year of significant change, and the love story could revolve around how the characters adapt to the new social, political and economic changes while falling in love.
One possible theme could be sacrifice. Given the historical context of 1917 which might involve war or social upheaval, the lovers may have to sacrifice their own desires for the greater good or for each other.