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Candace Philip and also Felix.
Candace has strong feelings for Philip, and Ferb.
Fred has won the affection of Candy, and also Felix.
Cathy being with Finn and Felix.
Finn Cara, and also Felix.
Candy has a deep connection with both Fred and Ferb.
I hope you find these variations helpful!
Journey to the Center of Candace Phineas and Ferb Wiki