A Yen to Write

Still need to get back to a story I started a while ago. Just need to have the time to do so. I know have the urge for another fic but this one will be a crossover. To make things interesting, I wonder if my friends here can guess what fandoms will be part of my crossover. I'll give you a hint: one fandom I have written in before but the other I haven't.

Whoever guesses correctly should they receive a prize??

I'll let you decide.