Sure! Here's the requested content in spun format with synonyms:
Cassandra loves
Phineas and Frank.
Cara has strong feelings for Fred, and Frank.
Phineas captures the love of Cara, and also Ferb.
Candy being with Fred and Felix.
Finn is cherished by Candace, and also Felix.
Candace shares a bond with both Philip and Foster.
I hope you find these variations helpful!