During the battle, Mirko brainwashes the enemy's personality and obedience [she listens to everything he says].
If you accept it, you will become a body that listens to whatever the man says.

Due to the effects of brainwashing, her body has been modified to suit men, and her breast milk and sensitivity have doubled.
This is a story where Mirko resists brainwashing, but she succumbs to the big cock.