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Cara is crazy about Philip and also Frank.
Candy has a soft spot for Finn, and also Foster.
Fred has won the affection of Cassandra, and Felix.
Cathy being with Fred and Felix.
Phineas means the world to Cara, and Foster.
Candy both Philip and Foster.
I hope you find these variations helpful!
Phinéas et Ferb le film Candice face à l'univers Wikipédia