Tell him what you are about to do to him. I start by telling them how I'm going to come over, take my clothes off, take his clothes off and how badly I want to go down on him. I tell him that once I'm done doing that I want him to stick his hard dick in me.you get the point.
Describe going down on him. Tell him that you are going to run your tongue from one side of his penis up to the tip and down the other side. Tell him after that you are going to swallow every inch of him and swirl your tongue on the way back up but before you do he has to be hard as a rock!