Cain is a top, but, to expand his "oeuvre" so to speak, he wanted to try bottoming. His choice to try this with was massive Luke. With a dick as think as he has, Luke was probably not the best choice for a first try. Fortunately, things work out. As they were driving to Cain's to do the shoot, he mentioned he might not be able to take Luke's dick, to which Luke's response was: "Well, how big's your dick?" Check out the video to see were this goes.