Inventions weren't merely for entertainment. They were an escape. (AU in which everything's black and white until you meet your soulmate) Rated T just in case.
Phineas and Ferb - Rated: T - English - Angst/Romance - Chapters: 1 - Words: 1,101 - Reviews: 4 - Favs: 22 - Follows: 6 - Published: 3/22/2015 - [Phineas, Isabella] - Complete