Sure! Here's the requested content in spun format with synonyms:
Cassandra adores Phineas and also Foster.
Cassandra Phineas, and Frank.
Phineas Candace, and also Frank.
Cathy takes delight in being with Phineas and Ferb.
Phineas is cherished by Candace, and also Foster.
Candy is emotionally attached to both Philip and Ferb.
I hope you find these variations helpful!