Archive of Our Own (AO3) is a popular place to look for 'Kara and Lena rated M fanfic'. It has a large collection of fan - created works.
Another option is to check out Tumblr. Sometimes bloggers share links to their favorite 'Kara and Lena rated M fanfic' or there are fanfic communities on Tumblr where you can ask for recommendations and find where to read them.
You could also try FanFiction.net. It has a wide range of fanfics, including ones related to Kara and Lena. Just use the search function and look for the appropriate rating and tags. But be aware that the quality can vary a lot.
Finding rated M fanfics can be a bit tricky as they often contain mature content. It's not advisable to look for them on general - purpose fanfic platforms that have strict content policies against adult - themed works. You should focus on platforms that are dedicated to more mature or adult - oriented fan works, but be aware of the legal and ethical implications.
You can start by searching on fanfiction platforms like Archive of Our Own. Just type in 'Kara and Lena rated M' in the search bar, and it should bring up a list of relevant fanfictions. Make sure to read the tags and summaries carefully to find the ones that interest you.
Since it's a fanfic, it could be about the adventures or interactions of Kara and Lena in a scenario where there is a 'daddy' figure involved. The 'rated M' might also suggest that it contains some content that is more suitable for a mature audience, perhaps some deeper, more complex storylines that are not for younger readers.
You can find Kara and Lena fanfic on websites like Archive of Our Own (AO3). It has a huge collection of fanfictions from various fandoms, including Supergirl where Kara and Lena are from. Just type in 'Kara and Lena' in the search bar and you'll get a ton of results.
You can start by looking on fanfiction.net. It has a large collection of fan - made stories, including many Kara Lena ones. Just use the search bar and type in 'Kara Lena' and you'll get a bunch of results.
I'm not sure specifically which 'Kara and Lena rated M fanfic' are the best. You could try searching on popular fanfic platforms like Archive of Our Own. Look for ones with high ratings and a lot of reviews from other readers.
You can try looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms.
Another notable one is 'Heartbeats in the Dark'. It's an M - rated fanfiction that really captures the essence of Kara and Lena's connection. It starts with a bit of mystery and gradually unfolds their relationship, with some steamy scenes that are tastefully done and a lot of emotional depth throughout the story.
Some fandom - specific forums or communities might also be a great source. For example, if there are dedicated Kara and Lena fan groups on social media platforms like Reddit or Tumblr. Members often share or recommend their favorite fanfics in those communities, so you might be able to discover some interesting 'kara x lena fanfic' through them.
You can find them on Archive of Our Own (AO3). It has a vast collection of fanfics, and there are many great 'kara danvers x lena luthor' ones there.