Well, a lot of Twilight fanfictions play with the idea of different pairings. There are stories where Edward is paired with other characters aside from Bella. Also, some fanfictions expand on the Volturi's history and their rule over the vampire world. They might create new conflicts or alliances within the Volturi ranks that add more depth to the Twilight universe.
You can start by checking out popular fanfiction websites like Fanfiction.net or Archive of Our Own. They have a wide range of Twilight fanfictions. Look for ones with high ratings and a lot of reviews. Also, you can join Twilight fan groups on social media and ask for recommendations from other fans.
Popular Twilight M fanfiction can vary greatly. There are stories that center around the romantic relationships from a different perspective. Maybe a story from the point of view of a secondary character observing the main love story. Also, fanfictions that expand on the world - building, like exploring different regions where vampires and werewolves exist and how their cultures differ in those areas.
Some fan - run forums dedicated to the series might also have such fanfictions. For example, Equestria Daily's forums sometimes have users sharing their original fanfiction works about Celestia and Twilight. However, the quantity might be more limited compared to the larger fanfiction platforms.
There's also 'Twilight's Ascent with Celestia'. In this fanfiction, Twilight discovers a new form of magic under Celestia's guidance. It delves deep into their mentor - student relationship and how it evolves as Twilight gains more power. It's full of magical elements and emotional moments.
You can start by looking on fanfiction websites. Many of them have search functions where you can type in 'Twilight M' and then sort the results by popularity or rating.
Another story could be about a married couple where one of them is writing a Twilight - inspired fanfiction. This causes some tension in the marriage as the other partner doesn't understand the obsession at first. But as they start to read the fanfiction, they get drawn into the world the writer is creating and it brings them closer together.
One interesting Rated M Twilight one - shot could be about a more intense and angsty encounter between Bella and Edward in a dangerous situation. Maybe they are facing a new and powerful vampire threat and their relationship is put under extreme stress.
I'm not sure specifically what 'm7707 twilight fanfic' is about as the 'm7707' part seems rather unclear. However, a Twilight fanfic generally is a fan - created story based on the Twilight series. It could be about different relationships from the series, like Bella and Edward's relationship from a new perspective, or it could explore the backstories of other characters in the Twilight universe.
You can try fanfiction websites like Archive of Our Own (AO3). It has a wide range of fanfiction, including Twilight - related ones with different ratings. Just use the search function and type in 'Rated M Twilight One - Shots' to narrow down your results.