this is a series of one shots to what might have happened if phineas had noticed each of Isabella's more romance signs towards him. First off you know it, the heart eyes from episode 1.

Isabella comes in heart eyed 'hey phineas '

phineas turns around notices the heart eyes before the graphics go back to normal 'i-isabella so that's how it's been huh you've always had a crush on me' 'good to know' that's how the rollercoaster one shot might have happened.