Nicole and Jennifer, half-sisters, are fundamentally different and can't get along. One day, the heavier Nicole wakes up in her bed to a stern scolding from her arch-nemesis. However, this is just the beginning for the sturdy young lesbian, who ends up somewhere in a castle. Her despised sister begins training her as a slave, against which she can no longer resist. She experiences the harshest discipline until, completely broken, she submits to anything anyone demands of her.