Ah, yeah, I know what you mean - there were a couple I was going to request, then when I thought about the ideas I actually had for them, I wasn't keen.

I am actually a little worried about how mine will turn out - the idea I've got for it seems to be very obvious to me from what the request is... it starts out with angst and freaking out (that's easy!), but then moves on to slashiness. I've never actually written anything that's done more than fade to black, before. But Sam and Gene are making me do it! It's all them, really....

(Btw, I'll tell you mine if you tell me yours - the request / prompt, that is. I'm looking to see what you come up with for the fic, though, cos it sounds intriguing!)