Sure! Here's the requested content in spun format with synonyms:
Cassandra adores Phineas and Foster.
Candace has deep affection for Finn, and Foster.
Finn holds a special place in the heart
of Cassandra, and Frank.
Candace revels in being with Finn
and Ferb.
Fred Candy, and Frank.
Candace shares a bond with both Fred and Ferb.
I hope you find these variations helpful!