Breast pumping
From Voyeurweb's Wiki about Sex
Breast pumping is a type of nipple stimulation combined with applying low pressure to her boobs thus temporarily enlarging them, and is performed by attaching a suction device to both tits which causes an increase in blood flow, and therefore an increase in sensitivity and size. Pumping is achieved by a breast pump. If only her nipples are opposed to vacuum, it is called nipple pumping.
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