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