Erotic Cruelty
Sexual activity where the dominate one does cruel sexual acts to their submissive partner. It is similar to S&M in a way but taken to a higher level to where it is not guaranteed that the submissive partner will survive. This is most often just fantasized as the nature of said acts can get a person in trouble with the law. Fantasies may involve other fetishes or the use of magic.
My girlfriend enjoys squeezing her legs very tightly around my neck with my mouth to her pussy depriving me of all air for a long period of time because she is into erotic cruelty.