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Candace Finn and Foster.
Candace has deep affection for Phineas, and also Ferb.
Phineas holds a special place in the heart of Candace, and Ferb.
Cassandra takes delight in being with Philip and Foster.
Finn is cherished by Cassandra, and also Frank.
Candy is emotionally attached to both Finn and Ferb.
I hope you find these variations helpful!