One of my partners doesn't bruise easily and doesn't think that I can leave a bruise that will last at least a week. What sorts of things can I do to bruise someone who doesn't bruise easily and make the bruise be one that will last? Are there places on the body more prone to bruising than others (I presume where the skin is thinner)? Just about any technique is on the table, but doing it with bare hands is ideal. We both enjoy being marked by each other and I'd like to be able to return the favor to her (I tend to bruise easily and heal slowly.. I guess I'm lucky!).