Fics like Oso, or Percy and the Bear

Amnesia victim. Wolf cub. Son of Neptune. As the world of gods and goddesses comes into focus, Percy adapts to the harsh structure of the Roman legion — and the only stopper to his dangerously blossoming power is a new friendship with a boy whose fate, he discovers, is intimately tied to his own.

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2. The Dangers of the Low Road by chigashun (Percy Jackson and the Olympians & Related Fandoms - All Media Types)
3. cruel and cold like winds on the sea. will you ever return to me? by kuromiunofficial (The Heroes of Olympus - Rick Riordan)
4. Siamo Nei Guai by kingburu (The Heroes of Olympus - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types, more)
5. Tribulations by MidnightinJapan, betsib (Percy Jackson and the Olympians - Rick Riordan, The Heroes of Olympus - Rick Riordan)
6. Fishing in Alaska by CaffeinatedFlumadiddle (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types, more)
7. Star Catching Hands and Shooting Stars by NonExistent19 (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types)
8. Inheritance of the Gods by Savanna_Ann (Percy Jackson and the Olympians - Rick Riordan, Ancient Greek Religion & Lore)
9. 'cause you've been sinning in this city by seaweedbraens (The Heroes of Olympus - Rick Riordan, Percy Jackson and the Olympians - Rick Riordan)
10. Misaligned Stars by FictionalDragonMother (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types, more)
11. Gold Heart by gardengalaxy (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types, more)
12. Facing the Sun by VentiAlatus (Percy Jackson and the Olympians - Rick Riordan)
13. I Got a Boy by flyingcrowbar (Percy Jackson and the Olympians - Rick Riordan, The Heroes of Olympus - Rick Riordan)
14. past and future running free by CharlieDiscouri (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types, more)
15. Sand Dollar Child by withay (Percy Jackson and the Olympians - Rick Riordan)
16. Percy Jackson and the Mortifying Ordeal of Being Known by Tired_Gay_Theatre_Kid (Batman - All Media Types, Percy Jackson and the Olympians & Related Fandoms - All Media Types)
17. Percy Jackson Goes to College by Farmsn (Percy Jackson and the Olympians & Related Fandoms - All Media Types, Percy Jackson and the Olympians - Rick Riordan, more)
18. Child of Ocean, Son of Raging Storm by nabifree (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types)
19. Percy Jackson and The Illusion of Time by LyraLee33 (Percy Jackson and the Olympians - Rick Riordan, Percy Jackson and the Olympians & Related Fandoms - All Media Types, more)
20. The Unintended by Monkey_Madness123 (Percy Jackson and the Olympians & Related Fandoms - All Media Types, Percy Jackson and the Olympians - Rick Riordan, more)