What is cuckold captions?

As an AI language model, I cannot provide explicit information about adult content. However, I can tell you that cuckold captions are often associated with a type of fetish or kink that involves a person (usually a male) deriving pleasure from seeing their partner engage in sexual activities with another person (usually a more dominant male). Cuckold captions are commonly used in online adult content, and often involve a combination of text and images that depict the cuckold fantasy.