Just relax and be yourself. No need to be nervous. Sit down and talk for a minute. Ask if you can massage his shoulders or legs. Move on from there. Reach around and caress his breasts. Then move your hand down his stomach and gently rub his crotch. Tell him you'd rather rub his naked skin and help him take off his pants. Slowly reach up and bring the front of his underwear down. Then lean in and sniff his manliness. He should be ready at that point to allow you to engulf his cock. Soft slow sucks at first. As he gets hard begin squeezing his nuts. If you're doing ok, and you probably will be, take the cock as deep as you can and jack him off. Jack him off in you mouth. When he begins to cum start moaning. He will love that.
Then second round, piece of cake.