A prevalent theme is redemption. Damon may be portrayed as a character who needs to redeem himself in Bonnie's eyes, or through his love for Bonnie, he finds a path to redemption. Also, the theme of forbidden love often shows up. Given their relationship's nature and the context of the original story, it can be seen as something that goes against the norm, which adds an exciting and often angst - filled aspect to the fanfiction. There's also the theme of mutual growth. Their relationship can be a catalyst for both of them to grow as characters.
The theme of sacrifice is quite common. It could be that Damon is willing to sacrifice something important for Bonnie, or vice versa. This shows the depth of their love. Another theme is the exploration of their different personalities. Damon is often seen as more brooding and complex, while Bonnie is strong - willed and magical. Fanfiction may explore how these personalities interact and complement each other in the context of their love. Additionally, the theme of second chances might be present, where they get a chance to start anew in their relationship despite past difficulties.
Love and passion are common themes. Since it's lemon fanfiction, there is often a strong focus on the physical aspect of their relationship as well as the emotional connection.
Well, a frequent theme is the change in their relationship. The pregnancy can either bring them closer or cause some initial friction. Also, the theme of secrecy sometimes comes up. They might want to keep the pregnancy a secret from their enemies or some of their more judgmental friends. And there's always the theme of preparing for the future, like finding a safe place to raise the child.
One common theme is the idea of an unlikely friendship. Since they have different personalities in the show, fanfictions often explore how they can form a deep bond. Another theme is adventure. They are usually thrown into some sort of dangerous or mysterious situation together.
Love is a very common theme. Since they are in a human context, their love is more about normal human connections, without the supernatural elements influencing it directly.
Well, a frequent theme is the exploration of Damon's intense love. It could be about how his love changes him, makes him more human. Also, there's the theme of redemption through love. Elena might be the catalyst for Damon's redemption in many stories. And of course, the theme of loyalty in their relationship is also quite common.
One common theme is the exploration of their intense and passionate love. Writers often focus on the emotional depth of their relationship.
One common theme is the exploration of their relationship against the backdrop of the magical world. For example, they might go on adventures together and fall in love during those experiences.
One common theme is love triangle. Since Bonnie, Damon and Stefan are all connected in the Vampire Diaries universe, the love triangle between them is often explored. It creates a lot of drama and tension.
You can try some popular fanfiction websites like Archive of Our Own (AO3). There are often a large number of fanfictions about different pairings, and you might find some great 'damon loves bonnie' ones there. Another option could be Fanfiction.net, though the quality can vary more widely on that site.
Another theme could be the development of their relationship. It might start from Damon's unrequited love and then gradually develop into a mutual and deep love. Writers may show different stages of their emotional journey.