I write for the prompts I like. If there is already a fic, I just make sure the tagline indicates it's different.

I have not claimed any because honestly, when you start acting a three year old during a kink meme I start to think your porn isn't any good. I did leave a post to an OP that I was working on their fic, since it was early in the post and I know they've asked for the same prompt the past several memes, but I did not "claim" it LOL.