A theme that also pops up is the discovery of new sides of each other. Clary and Alec each have their own personalities and secrets. Fanfictions often explore how they learn more about each other, which in turn strengthens their bond. For example, Alec might discover a more vulnerable side of Clary, and vice versa.
Well, one common theme could be the exploration of their relationship in more intimate or romantic settings. Another might be the development of their characters within those scenarios.
Friendship is a very common theme. They are both important characters in the Shadowhunter universe, and many fanfictions explore how they become friends and support each other.
One common theme could be betrayal. Alec might be in a situation where he has to betray Clary for some reason, like loyalty to his own group or family, which causes her harm.
One common theme is the adjustment of their relationship. With the pregnancy, they need to redefine their roles and how they interact. Another theme is the support from their friends and family. In many fanfictions, their friends play an important part in helping them through this new chapter.
Love and commitment are common themes. Their marriage is a new chapter, and fanfictions often explore how they stay committed to each other in the face of various difficulties.
One common theme is friendship. Many fanfics explore the deepening of the friendship between Alec and other characters. For example, how Alec and Clary become closer friends over time and support each other through various difficulties.
One common theme is family. Since they both have complex family backgrounds in the Shadowhunter world, their married life often involves dealing with family issues. For example, how their families interact with each other.
The theme of redemption sometimes appears. Some fanfictions attempt to show Valentine in a different light, as if there is a possibility for him to be redeemed through his relationship with Clary. This can add an interesting layer to the story, as it goes against the more straightforward view of him as a villain in the original narrative.
One key element could be the unique setting related to the lemon. It might be a lemon - scented magical place or an object that has lemon - like features. Another element would be the relationship between Clary and Alec. Their different personalities and how they interact in this lemon - centered situation is important.
In this fanfiction, perhaps there is a prophecy about Clary and Alec and a lemon. They initially think it's absurd but as they dig deeper, they realize it's related to an ancient power. Along the way, they face many obstacles, including people who don't believe them and try to stop their investigation. But through their combined skills and growing friendship, they persevere to uncover the truth about the lemon prophecy.