What are the features of best friends whenever fanfiction rated M about Cyd and Naldo?

Yes, they do. In some fanfictions, their relationship progresses to a kiss.

The rating could be due to mature themes, intense emotions, or maybe some explicit content involving the characters.

You might consider writing a fanfic where Cyd and Naldo start a business and face all kinds of challenges and successes. It could show their friendship growing stronger through teamwork and determination.

Yes, Cyd was abused in some versions of the fanfiction.

It could be due to mature themes, intense drama, or explicit content. These elements often contribute to a higher rating like M.

I'm not sure exactly what happened to Cyd Hurt. You might need to read the fanfiction to find out for sure.

It could be a funny and light-hearted one where Naldo's sneezes lead to comical situations among the friends.

Cyd has quite an adventure. She gets stuck in a time loop and has to find a way to break free.

Maybe Naldo hurt himself while trying to do something heroic or risky. Or perhaps there was a misunderstanding that led to his injury.

The abusive relationship in the fanfiction is pretty serious. There's emotional manipulation, control, and sometimes even physical aggression. It makes for a very intense and disturbing read.