Shrink-wrapped balls

[NickManchester]

This is a very strange fantasy. Every now and again I see a porn video where a guy’s balls get tighter and tighter and move around and apart the closer he gets to cumming. When I say ‘tighter’ I don’t mean that his ball sack draws the balls up close to the body, that’s normal, what I mean is that the two balls literally get shrink wrapped by the scrotum and stand visibly out so you can see practically all round them. They even move around like they are on stalks. It doesn’t happen very often but when I see it it I instantly have to blow my load because it’s so hot. Hard to explain but if anyone has any photos or videos I’d love to see them. Thanks