IamTheGuilty
First fanfic: this is right after The Last Day of Summer, Phineas and Ferb are going to school. NOTE this story follows the timeline of the TV show, you might see some references to episodes...
Also, this won't be functioning like a normal fanfic, each chapter is an "episode", like the TV show, so you can basically read any part without any context.
Plots will be replaced, Phineas and Ferb building things will be in a school, perry and Doofensmirtz will not be fighting, but working together at the highschool, and Candace is replaced since she's at the highschool.