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The nipple clamps had rings in the ends of them and tightened when the rings were pulled. Long cords were tied to the rings. He gently carressed her right nipple until it was firm and hard, and then fastened a clamp to it.
By the time the pain had subsided enough for her whimpering to stop, he was repeating the process on the left side. He drew the ends of both cords up behind her back, under her arms, and pulled them tight.