Important thing to remember.. guys will accept hearing basically anything when they're about to get laid. Once we get turned on.. almost anything goes. You have no need to be embarrassed... whatever you say to him or make him do, he'll be happy about because he's going to get laid. Be as vulgar and bossy as you want.
Also, challenging/offering a reward is a fantastic way to go. Ie.. "If you want me to even touch your dick, you're going to have to get me off with your tongue first."
Try just ripping off his pants, shoving him onto the bed, and then getting on top. Anytime he tries to touch you, push his hands away while you ride away. It'll drive him crazy.
Be a tease. Guys love teases (when they eventually get some!) Do the same thing as above when you're getting started.. keep pushing his hands away and touch him everywhere but his dick. Eventually he'll get more and more aggressive.
Get some handcuffs! Whip them out when he's not expecting it, cuff him to the bedpost, and then torture him with your lips and tongue. He'll love you for it.
Lots of things you can do!