No, an account on fanfiction . net is free.

There are many fanfiction sites that are not fanfiction-dot-net, however, they are going to be the larger fandoms such as Twilight, Harry Potter, Star Trek, and such. Most of the smaller fandoms like manga and lesser-known books and shows, are just going to have a few fanfiction stories and those will most likely be on fanfiction-dot-net.

Type "___ fanfiction" into your search engine, where the blank is the type of fiction you're looking for, and it will show whatever's out there.

You might also try LiveJournal and search for communities that feature fanfiction.

No, it doesn't. It's basically just writing a story based on another. You can post it on fanfiction (dot) net for free.

I don't have the ability to read fanfiction, but there are many great Spuffy AU fanfiction stories available online. Websites like Archive of Our Own or Fanfiction.net are good places to find new and interesting stories to read.

Fanfiction Net has a few good ones but the best site for a Uke Yusuke,would be Adult FanFiction.