Fics like The First Step is All it Takes

When Perry Fletcher receives the call from his father telling him that his brother passed away along with his sister-in-law, he doesn't know what to expect. And becoming the legal guardian of their three children was definitely not what he'd thought would happen.

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1. Secret Santa (December 2013) by shopgirl152 (Phineas and Ferb)
2. Ow, my neck! by KissingLizard (Phineas and Ferb)
3. well, i wanna go back (but i'm halfway to the place where we will meet) by flibbertygigget (Phineas and Ferb)
4. The Doofenshmirtz Heirloom Theft by KissingLizard (Phineas and Ferb)
5. What's She Doing Here? by kittyhazelnut (Phineas and Ferb)
6. The Transmigratinator by Boomchick (人渣反派自救系统 - 墨香铜臭 | The Scum Villain's Self-Saving System - Mòxiāng Tóngxiù, Phineas and Ferb)
7. A Platypus Habitat by KissingLizard (Phineas and Ferb)
8. forget-me-not (Phineas and Ferb)
9. Let's all assume the worst by KissingLizard (Phineas and Ferb)
10. Be Right There by orphan_account (Phineas and Ferb)
11. Maybe He's Just Taciturn by BlackEyedGirl (Phineas and Ferb)
12. You pulled all your stitches out because you had to fistfight me by KissingLizard (Phineas and Ferb)
13. Perry-digm Shift by talanashta (Phineas and Ferb)
14. And In This Crazy Life by CongressIsAliens (Phineas and Ferb)
15. Watching the Cipher-Verse by Mandalore_the_Atreides (Phineas and Ferb, Phineas and Ferb the Movie: Across the 2nd Dimension (2011), more)
16. Early Days by LoonyLoomy (Phineas and Ferb)
17. If Doofenshmirtz had a penny everytime he saved a little girl in Japan, he would have two penny and two additionnal daughters. by Monsieur%20Otter (Phineas and Ferb, 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga))
18. For Now by ren_galileo (Phineas and Ferb)
19. Team Teal Talks by Wanderbird (Phineas and Ferb)
20. Waterlogged by TolkienScholar23 (Phineas and Ferb)