Very fun to see things work out!

The eye joint has an Target/Aim-At tag applied, directing it to an invisible null object that's offset from the Eye Target object which itself has Restriction tags applied so it'll never make the eye roll into a position it shouldn't. Putting in those numbers took some eyeballing, moving the target and then adjusting the values on the Protection Tag's "Limit Position" fields until the eye stopped moving any further in a given direction.

Visual example: https://www.furaffinity.net/view/64455670/



Will be moved to Scraps in a bit