I hoped you like it, it turned out a bit harder than I thought. My original idea was based on the future details Chris gave them from his timeline.
Wyatt would go evil,
Chris would feel neglected by Leo and
Piper would die on Chris's 14th birthday (well for the purposes of this story anyway).
I was interested in exploring why these things might occur, how this knowledge would affect everyones behaviour and how they might try to prevent them happening again. I originally thought they should fail and the original ending was to have been along the lines of
Alternative Ending
Piper had to die no matter what because, as the TV show says once the A of D gets involved he always gets his mark. Wyatt was going to be really pissed off about the premonition violation, believing that they were just trying to control him. He would be particularly mad at Chris and decide that Chris had gone to the past to lie to their family about him (Wyatt) to get Leo's approval. Wyatt and Chris would have a big fight at the beach party, Piper would interven and Chris, not Wyatt, would have accidentily killed her. (HA! HA! Weren't expecting that were you, that was my twist).
Chris would turn to Leo for comfort, but Leo would have immediately orbed out to that place in "Awakening" to try and save Piper, He would fail and to punish him for trying to do this totally taboo thing a second time the Elders have his soul recycled. He never gets a chance to see his sons again, Chris wouldn't know what happened to Leo and just think he abandoned them when they needed him most. Wyatt would find out and hate the Elders. Not sure how far into the future I'd have gone, but in my head Paige and Phoebe would have died quite soon without the protection of being the charmed ones. Wyatt would blame Chris for everything that went wrong, but be unable to hurt him due to the promise he made Piper and it was going to end with Chris (the only person who did not know he had originally gone back in time) vowing to change it all somehow.
I think the above would probably have made a better story, but it was making me miserable and when it came to writing it I found I just couldn't kill Piper. I hope that happy ending wasn't an anticlimax. I am interested to know if you think I chose the right ending.
Thank you
Finally I just wanted to say thank you again for the people that reviewed this. I know I keep saying it, but it doesn't make it less true, I really, really appreciate the reviews and the people who reviewed lots of chapters you totally rock. Although when you missed a one I'd find myself going, "Oh no, where've they gone, they hated it, and then I'd obsess about what it was you didn't like in a very sad loser way.