Expose her to the Sun.

You pulled Anne out of her stand, and threw her onto the ground. The sun beat on her breasts, and you could feel them gurgle. Milk blasted out of her tits. Her little nipples couldn't push all the milk out at once.

Anne's breasts began to expand.

"O-oooh! Ooooh!!!" Anne moaned.

Her breasts pulsed, as mink continued to spray. You clung onto her inflating breasts and sucked on her ever-growing boobs.

"Make it stop! Make it stooop!!!"

You wouldn't let it stop. You wanted her breasts to keep growing like this, just for your pleasure.