Fics like let me repay the favor

After Gary stands up to his mom for him, Marshall finds a way to repay the favor. — Or, Marshall stands up to Gary’s boss for him, and the two of them are madly in love.

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  3. Embers by EverlastingMoonlight02 (Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023))
  4. Cyclical by moth_infernum (Adventure Time: Fionna and Cake (Cartoon 2023), Adventure Time (Cartoon 2010))
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  7. Wrath of the Wishmaster by Void_Ink_Studios (Adventure Time: Fionna and Cake (Cartoon 2023))
  8. Living with a witch by RaggedyPina (Adventure Time: Fionna and Cake (Cartoon 2023), Adventure Time (Cartoon 2010))
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  10. misery loves company by sparklinggrapesoda (Adventure Time: Fionna and Cake (Cartoon 2023))
  11. Smoke, Scotch and a Virgin King by IceandWeird (Adventure Time: Fionna and Cake (Cartoon 2023), Adventure Time (Cartoon 2010))
  12. Part of the Madness by RedFeatheredReptile (Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023))
  13. Mercy Is Just Another Word For Desire by Rachrar (Adventure Time: Fionna and Cake (Cartoon 2023), Adventure Time (Cartoon 2010))
  14. The Ultimate Crossover by orphan_account (tumblr sexyman - Fandom, Undertale (Video Game), more)
  15. Caught in a Brine by roo_hoo (Adventure Time: Fionna and Cake (Cartoon 2023), Adventure Time (Cartoon 2010))
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  17. The Lion of Embers Rewrite by Unicornmachine (Adventure Time: Fionna and Cake (Cartoon 2023))
  18. and yesterday, you were here with me by withtheginkotrees (Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023))
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  20. Killing Time by SinnerDinner (Adventure Time: Fionna and Cake (Cartoon 2023), Adventure Time (Cartoon 2010))