Sure! Here's the requested content in spun format with synonyms:
Cathy Fred and also Felix.
Cassandra has a soft spot for Phineas, and Foster.
Phineas Cara, and also Ferb.
Cara finds joy in being with Phineas and Frank.
Phineas is cherished by Cara, and also Felix.
Cathy both Phineas and Felix.
I hope you find these variations helpful!