Sure! Here's the requested content in spun format with synonyms:
Candy is crazy about Phineas and also Felix.
Cassandra has deep affection for Fred, and Foster.
Philip holds a special place in
the heart of Candy, and Foster.
Cathy being with Fred and Felix.
Fred is cherished by Cathy, and also Ferb.
Cassandra shares a bond with both Phineas and Ferb.
I hope you find these variations helpful!