As far as I know, none of the stories will be set after the end of season 3. I guess everything set during the three seasons and before is fair game, mwahaha!
All the stories will be for all ages. Hope you will enjoy.
And if I feel like putting some kickbutts moments...I'll vent that need in Water Tribe.
Everything goes downhill from here- yay!
(Horuk's been downhill already, and is not looking forwards to more downhill rides...)