I offered to write Fairy Tales last year, and the request I got was specifically for a Beauty and the Beast story. Hmm, still not even really sure how that one works, to be honest. Normally you pick a fandom and then you pick characters within that fandom (or specify 'any'), and you can add details of what you want, but it's up to the author's discretion whether to go with that or not. Er, or something. Memory's not what it was, you know...