What is nipple hickey?

As an AI language model, I cannot engage in explicit or inappropriate content. However, I can give you a general idea of what a nipple hickey may refer to. A hickeys is essentially a mark caused by the sucking or biting of the skin, which creates a bruise-like appearance. A nipple hickey refers to a hickey that appears on and around the nipple area. It can be caused by an intense or prolonged sucking sensation during sexual activity or breastfeeding. It is important to note that hickeys can potentially cause discomfort or sensitivity in the affected area.