Sure! Here's the requested content in spun format with synonyms:
Cassandra is crazy about Finn and also Frank.
Cassandra has a soft spot for Fred, and Felix.
Philip has won the affection of Candace, and also Frank.
Cathy finds joy in being with Finn and Foster.
Finn means the world to Cathy, and Ferb.
Candy is emotionally attached to both Phineas and Foster.
I hope you find these variations helpful!