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