When a character's breasts are replaced with balls.

If the body parts in question are shared between multiple people (acting as balls for one character and breasts for another character) then both breast_balls and testicle_breasts may apply.

Not to be confused with:

• breast_balls (when a character's balls have nipples or are replaced with breasts)

Also see:

• dickhead
• crotch_head
• dicknipple_balls
• unusual_anatomy
• unusual_balls_placement