Anyone know any good forums + comment swap

I'm desperate to get involved in a forum, does anyone know any good ones? I want to get more involved with Mibba and I think forums would be a good way to go

Comment swap
I would prefer it to be original fiction, but I don't mind fan fiction one shots
Please nothing above r-rated, that is overly sexual or whatever
You comment first, then I comment

If your story is under 5,000 words please comment on this
If your story is 5,000 + please comment on this

Thank you very much!

Xxx