Fics like This is about a girl, isn't it?

While I loved 'Act Your Age' as much as the next fan, there is no way I am buying that Phineas manages to hide his "thing" for Isabella from Ferb throughout all of high school. Because there is no way Ferb could have possibly known without him doing something about it, right? This AU takes place during Phineas', Ferb's and Isabella's high school years, in a universe in which Phineas can't quite manage to keep his crush on a certain girl from his observant step brother.

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