Make it wet and do it without inhibitions. You're in! Incorrectly touch him in this area and it can cause pain. And, yes, I've jacked off thinking about it after each time I sucked him. What is hepatitis? This will be music to his hears and get him even hotter.
Close your hand around his penis and move your hand back and forth along with your mouth. Less common but potentially more serious is Hep C. Use the following tips to keep from gagging:
It allows you to give each other blow jobs at the same time.