Allow some spit to dangle from your mouth to his penis as you move your head away from it. The spit will create a chain from your lips down to the tip of the penis. As the spit begins to settle, lurch downward a slurp it around the penis. The added lubrication will allow your tongue and lips to glide around the shaft, creating an incredible surge in pleasure for him. This technique is regarded as "nasty", but nasty in a good way. Guys will do anything to get a nasty blowjob.