The girl has realized she should study harder since she was punished by her step father, even though her score is beautiful.

In order to enhance the principle, she has to be tied up while studying, her step father helps her to turn the pages of books.

When she feels tired, she can have a rest lying on the sofa, but the ropes tightly tied on her body will not loose.

Even more, her step father stuffs a hook in her asshole, then use a rope tied the hook to her toes.

Her step father says it's a good way to improve her resilience.