Some Tumblr blogs are dedicated to sharing fanfictions. You might want to search for tags related to ciel x lizzy lemon on Tumblr. There could be some bloggers who post or recommend such fanfictions.
Fanfiction.net is also a great place to look. It has been around for a long time and has a wide range of fanfiction. You might need to do a bit more digging compared to AO3, but it's likely to have some interesting ciel and lizzy lemon fanfiction. Just make sure to read the reviews and ratings to find the better - quality ones.
There's a fanfiction titled 'Unlikely Bonds' which delves into how Ciel and Lizzy Lemon, coming from different worlds, gradually form a relationship. It shows their journey of understanding each other's personalities and pasts in great detail. In this story, they face many challenges together which ultimately strengthen their bond. It's a really engaging read as it combines elements of adventure and romance.
Fanfiction.net might also be a place to look for 'ciel x reader lemon fanfiction'. However, keep in mind that the quality and content can vary greatly. Some stories may be well - written and in line with the theme you're looking for, while others might not be as good. Also, make sure to respect the website's terms and conditions.
Archive of Our Own (AO3) is a great place to start. It has a large collection of Ciel x Alois fanfiction with various themes and storylines that are not of a lemon nature.
Adventure could also be a theme. Writers might put Ciel and Lizzy in various adventurous situations where they have to rely on each other and their relationship deepens as a result. For example, they could be on a quest together to solve a mystery or defeat an enemy. This not only adds excitement to the story but also gives more depth to their relationship.
I'm not sure of specific 'ciel x lizzy lemon fanfic' titles off the top of my head. But you can try searching on fanfic websites like Archive of Our Own. There are often a lot of great fan - created stories there that might match what you're looking for.
In some ciel x lizzy fanfictions, there is a theme of self - discovery. As they interact more, they learn more about themselves. Ciel might discover a softer side of himself because of Lizzy, and Lizzy might find more strength in herself. Also, the theme of loyalty often comes up, as they prove their loyalty to each other in different situations in the stories.
One popular ciel and lizzy lemon fanfiction might be those that explore their relationship in a different setting, like a modern AU (alternate universe). In these stories, Ciel could be a regular high school student and Lizzy could be his classmate. They might face typical high school dramas while still having the essence of their original relationship from the source material.
Some ciel x lizzy fanfictions focus on their relationship development in different scenarios. For example, there might be stories set in alternate universes where they meet under different circumstances. You could also try looking on Fanfiction.net, although the selection might be a bit more varied in terms of quality compared to Archive of Our Own.
You can try Archive of Our Own (AO3). It has a vast collection of fanfictions, including many about Ciel and Elizabeth. Just use the search function and type in their names to find relevant stories.