Anna quickly finishes to take off her pumps and, with an evil grin, lowers her sweaty feet on her sister's face.
The poor Nina can only watch as her sister begins to slowly rub her smelly feet, spreading the sweat carefully in every inch.
Seeing her sister's horrified face, Anna says: "Don't worry, honey. You'll learn to like it. When i'm finished with you, you will beg me to worship my divine feet"
She continues then to rub her feet for several minutes, until Nina's face actually smells like her feet, an humiliating scent impossible to wash off.
She then stops and, holding one foot on her face, asks her: "So, 'sis...you have two choices:surrender, and accept the humiliation or go on, and let me punish you some more."

What does she do?