Fics like Summer Rain

Due to an accident that separated Phineas as a baby, Phineas never knew his family, and Ferb never knew his brother. Now, 13 years later, Phineas is a runaway from the foster system, homeless and surviving on the streets. Ferb doesn't know much yet about the quiet yet wickedly smart boy he runs into, but feels strangely drawn to him, and is determined to figure out why.

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4. Malfunction by shadowfire125 (Phineas and Ferb)
5. Perry-digm Shift by talanashta (Phineas and Ferb)
6. Be Right There by orphan_account (Phineas and Ferb)
7. forget-me-not (Phineas and Ferb)
8. Don't Take Candy (From Anyone) by LigerCat (Phineas and Ferb)
9. 'Cause We're Nemesis by that_1Anon (Phineas and Ferb)
10. Mistakes and Worry by Fangirlwriting (Phineas and Ferb)
11. Let's all assume the worst by KissingLizard (Phineas and Ferb)
12. A Break by bamboozledeagle (DuckTales (Cartoon 2017), Phineas and Ferb)
13. Masterweaver's Random Seeds by Masterweaver (Mass Effect Trilogy, Horizon: Zero Dawn (Video Game), more)
14. Maybe He's Just Taciturn by BlackEyedGirl (Phineas and Ferb)
15. Izuku Doofenschmirtz by orphan_account (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), Phineas and Ferb)
16. Blut ist Dicker als Wasser by DesdemonaKaylose (Phineas and Ferb)
17. Watching the Cipher-Verse by Mandalore_the_Atreides (Phineas and Ferb, Phineas and Ferb the Movie: Across the 2nd Dimension (2011), more)
18. Into The Mysterious Force by NaluFanForLife (Phineas and Ferb, Phineas and Ferb the Movie: Across the 2nd Dimension (2011))
19. The Stuff of Legend by Rehearsal_Dweller (Phineas and Ferb)
20. What's She Doing Here? by kittyhazelnut (Phineas and Ferb)