Headmistress' Favorite Sport Part 8

They furthermore ordered her to masturbate at least three times while at school and at least four times while at home, without cuming of course. To make sure that their orders were obeyed, they gave Mandy a special watch. In the watch were pulse- and blood pressure monitors and a small computer. The twins had recorded the way in which Mandy's pulse and blood pressure behaved when she came, and the computer was set to recognize this pattern. If the computer recognized the pattern it sent an SMS to the twins cell phone alerting them of Mandy's breach of orders and swift and brutal punishment would follow.

Mandy was kept on the edge for weeks and months without being allowed to cum. Constantly aroused her nipples now seemed to be erect all the time and she had to dry the insides of her thighs for juices several times a day. Had the twins not bossed her around, making her do her homework and behave like nothing had happened, she would have been unable to do anything but think about sex. Every time she saw the twins she would beg and plead to allowed to cum and every time the twins' reply would be "no" followed by some new punishment or humiliation.

When the twins had removed the last remnant of independence from Mandy, they decided it was time to deal with her mother.

Mandy's mother, Angela, had felt no desire to remarry after her husband's death. This was in spite of the fact that she was both physically and economically desirable. She simply preferred being the boss. Controlling Mandy was simple; the girl was sweet and Angela loved her daughter, but she had no taste, no flair and of course no spine. She had to be guided, as Angela liked to call her iron-fisted control of Mandy.

So Angela was a not only surprised, but extremely dismayed by the sight that met her one Friday afternoon when she came back from a shopping trip to town. In her living room were two girls, whom she only after a couple of seconds recognized as the twins from Mandy's class.