Another rule: If you have a good idea, please, please for God's sake develop it the right way! My anecdote: I'm a GSR fan, so I don't like to read fanfic that contradicts my ship. But for some reason, I read one Grillows fanfic where it turned out, Grissom and Catherine were Sara's real parents, and Grissom was Lindsay's real father (making Sara and Lindsay sisters) and they were secretly married for like 1000 years. On a GSR perspective I thought "that blows", but intellectually speaking, it was a good idea. Problem is, for starters Cath's only 10 years older than Sara. And no, there's no way in the world Grissom could go all "Oh Sara, you know why I haven't corresponded to your unrequited love for me? Because I've been married to Catherine! And she's your mommy! And I'm your daddy! and Lindsay's your little sister!" and then have Sara go all "Oh, so that was it? Ok! Mommy, Daddy, Sister, I'm so happy for you! And for me! Let's be a happy family!", and then have a Happy Anniversary cake in the break room and everybody happy. It-doesn't-work-like-that! To the author: just imagine that happening to yourself. How would you react? wouldn't there be some drama (or better yet, trauma) involved? Can it really be resolved in a one-shot?