I really like 'Tim and Cassie: Growing Bonds'. In this fanfic, it starts with them having a bit of a misunderstanding which is really relatable. Then as the story progresses, they start to understand each other better and their friendship evolves into something more. It has some really great dialogue that makes the characters come alive.
I'm not sure specifically about 'lemon' fanfics as they often involve inappropriate or adult - themed content which is not suitable. However, there are many great fanfics about Tim Drake and Cassie Sandsmark that focus on their relationship in a more appropriate way. You can try searching on fanfic platforms like Archive of Our Own and filter for the Teen and up rating.
Another option is Tumblr. There are often fanfic recs (recommendations) on Tumblr. Some blogs are dedicated to sharing great fanfictions, and you might be able to find some good Tim Drake and Cassie Sandsmark fanfictions through those blogs. Just search for relevant tags like #TimDrake #CassieSandsmark #Fanfiction.
Archive of Our Own is a great place to start. It has a wide range of fanfics, and you can use the rating and filtering system to exclude any adult - themed stories. You can search specifically for Tim Drake and Cassie Sandsmark, and then select the Teen and up or General Audiences ratings.
One great Tim Drake and Bernard fanfiction is 'A New Beginning'. It beautifully explores their relationship development. The story starts with a chance encounter and then delves into how they support each other through various challenges in Gotham.
There's also a fanfic called 'Tim and Annie: Partners in Adventure'. In this story, they team up to solve a mystery in Gotham. The plot is full of twists and turns, and the interaction between Tim Drake and Annie is very engaging. It shows their different personalities coming together to overcome challenges.
One great Tim Drake and Damian Wayne fanfiction is 'The Brothers' Bond'. It really delves into their complex relationship, showing how they grow from rivals to comrades. Another good one is 'Growth and Understanding', which focuses on Damian learning from Tim's more experienced perspective in the field.
Well, I really like 'Jason Todd and Tim Drake: Allies or Rivals?'. This fanfic is interesting because it plays with the idea of whether they are friends or foes. It has some great action scenes and character development. Then there's 'The Tale of Jason and Tim' which gives a more in - depth look at their individual personalities and how they mesh. And 'Jason & Tim: Unlikely Partnership' is also a great read as it shows their journey from distrust to mutual respect.
There's a fanfic called 'Partners in the Dark'. It focuses on the trust that develops between Tim and Cassandra. It starts with a simple mission that goes awry, and through their struggles, they learn more about each other and grow closer. It's a heart - warming read that any fan of the two characters would enjoy.
Popular tropes in their fanfiction include the 'rivalry - turned - friendship - or - more' trope. They might start off as rivals, competing in some aspect like who can solve a mystery faster or who is a better fighter. As the story progresses, this rivalry turns into a strong friendship or a romantic relationship. The 'in - over - their - heads' trope is also seen often. They get involved in a situation that is far more dangerous or complex than they initially thought, and they have to rely on each other to get out of it.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can simply search for 'Cassi Sandsmark and Tim Drake' in the search bar. Another option is FanFiction.net, though the content there might vary in quality. Some Tumblr blogs also share and recommend good fanfictions related to them.