Does flaming sphere always need a move action to attack?

Question

A Flaming Sphere will 'attack' anyone it rolls into the same square as:

If it enters a space with a creature, it stops moving for the round and deals 3d6 points of fire damage to that creature, though a successful Reflex save negates that damage.

However if its 'at rest' it doesn't move:

The sphere moves as long as you actively direct it (a move action for you); otherwise, it merely stays at rest and burns.

However what happens if the sphere rolls into the same square as a target on turn 1 (who rolls their Reflex save as per usual) but said target then doesn't move out of that square?

Does the mage need to use their move action to attack the target again even though the sphere is still in the square as them?

Note: The flaming sphere is 5 ft diameter in both 3.5 and Pathfinder and a standard 3.PF square is 5 ft square.

Answer 1

No. The sphere will remain on the same square until the wizard spends a move action to move it again, or the wizard moves out of the spell's range. I quote your quote:

The sphere moves as long as you actively direct it (a move action for you); otherwise, it merely stays at rest and burns.

That means that while the wizard is inside the spell's range, AND the spell's duration has not expired, the sphere is active regardless if the wizard moves it or not. So if it occupies the same square with a target, and the target does not move out of the square, she will be burned by the sphere, on the wizards next round WITHOUT any action needed by the wizard.

-EDIT-
Flaming sphere's diameter is 5 ft, both in Pathfinder and 3.5.

• Pathfinder
• 3.5 RAW

So it is logical that a square occupied by the sphere is on fire for the duration of the spell, and anybody that is on the same square or passes through it is affected by the spell (Entitled to a reflex save or damage) regardless if the caster moves the sphere on her round. Credit to @Can Canbeck and @medivh for the comments clarifications :)