A sudden cock erection
On the one of the gay voyeur videos I got there is a black man caught on spy cam washing in the showers. You can really see how big dick he got becasue of a sudden erection – and that is because of other hot naked men he saw there!
So, on the video you can see how this young black athlete is washing and then is dries with his towel and get dressed. All that time you can spy for his swinging big soft cock.