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Candace Philip and Ferb.
Cathy has strong feelings for Finn, and also Felix.
Phineas captures the love of Cara, and also Foster.
Cathy finds joy in being with Finn and Foster.
Finn is cherished by Cathy, and also Foster.
Cathy has a deep connection with both Philip and Frank.
I hope you find these variations helpful!
Journey to the Center of Candace Phineas and Ferb Wiki