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Cassandra Finn and Ferb.
Cassandra has strong feelings for Fred, and also Frank.
Phineas captures the love of Cara, and Felix.
Candace finds joy in being with Fred and Ferb.
Finn means the world to Candy, and Frank.
Cathy is emotionally attached to both Fred and Frank.
I hope you find these variations helpful!
candace phineas and ferb