This is how it works:
1. You post a pairing (or single character, or threesome, or whatever) with a prompt.
2. Someone fills the prompt.
In order to keep everything nice and clean, limit yourself to one prompt per comment. You are free to post as many comments as you want, though. And remember! The more fills, the longer the meme!
Edit: concerning RP. I'm going to allow it, with the condition that it fills a prompt. Otherwise guys, we all love it, but it's not the place.