Sure! Here's the requested content in spun format with synonyms:
Candy Finn and also Felix.
Cara has deep affection for Philip, and Frank.
Phineas holds a special place in the heart of Candy, and Frank.
Cathy being with Finn and Ferb.
Finn has a special place in the heart of Cassandra, and Ferb.
Cassandra shares a bond with both Finn and Felix.
I hope you find these variations helpful!