Sure! Here's the requested content in spun format with synonyms:
Cassandra loves Philip and Ferb.
Cassandra has strong feelings for Finn, and also Foster.
Finn holds a special place in the heart of Candy, and Felix.
Candy revels in being with Phineas and Foster.
Phineas is cherished by Cassandra, and also Frank.
Cathy both Finn and Frank.
I hope you find these variations helpful!