Fics like Early Days

Phineas became good friends with Ferb before their parents married. But he'd never heard the shy child laugh before... [Pure, childish fluff.]

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5. Remind Me (That I'm Worth It) by HidingintheInkwell (Phineas and Ferb)
6. Boyfriend Material by Chaos_Valkyrie (Phineas and Ferb)
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8. Better left unsaid by KissingLizard (Phineas and Ferb)
9. Maybe He's Just Taciturn by BlackEyedGirl (Phineas and Ferb)
10. A Forgone Conclusion by wordsmith_kari (Phineas and Ferb)
11. Coffee Stains and Creaky Floorboards by Dippingmytoesindreams (Phineas and Ferb)
12. Fletcher Antiques and Restoration by KissingLizard (Phineas and Ferb)
13. Hoping to Find a Savior by Chaos_Valkyrie (Phineas and Ferb)
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15. Just You by jmandrake (Phineas and Ferb)
16. Summer Rain by Iron_Tony604 (Phineas and Ferb)
17. Lines in the Sand by The_Bookkeeper (Phineas and Ferb)
18. Store your nemesis under your bed by KissingLizard (Phineas and Ferb)
19. Waterlogged by TolkienScholar23 (Phineas and Ferb)
20. Playing Dead by PopcornFairy28 (Phineas and Ferb)