Hey, I don't understand what the problem is. The premise is ambiguous enough to invite creativity. You'd probably stumble upon a lot more innovation and playfulness here than in, say, the Sherlock Holmes fanfic section, where people would have to deal with character and setting established over decades.

(Note: I'm really just speculating here. I haven't read any of the fanfic here, and the only Sherlock Holmes fanfic I've read is Neil Gaiman's. I could be wildly wrong.)