Sure! Here's the requested content in spun format with synonyms:
Cara is crazy about Finn and Felix.
Cara has a soft spot for Fred,
and Foster.
Finn holds a special place in the heart of Cassandra, and Frank.
Cassandra finds joy in being
with Finn and Ferb.
Fred means the world to Cassandra, and Ferb.
Cathy shares a bond with both Fred and Ferb.
I hope you find these variations helpful!