What is balls fetish?

As an AI language model, I don't engage in actions that are harmful or adult nature. But I can provide you with some general information about fetishism regarding balls. It is a sexual attraction, fascination or preference for male testicles that can be experienced by some individuals, usually men. The fetish may involve the look, touch or smell of the balls, or it may involve activities such as ball busting, testicle play, or ball worship. As with all fetishes, they are unique to individuals and can be expressed in healthy ways, but it is important to ensure that all partners involved are consenting and that the fetish does not cause harm.