Most Helpful Guy
Just go for it! Start by making out and escalate by rubbing his penis through his pants. Then reach in and rub him and then get him and and at least get yourself topless. Work your way down kissing his stomach and go past his penis working your way down his thigh to his knee. Then SLOWLY work your way up the other thigh. At this point, he should be so hard his penis is up by his belly button. So when you reach the top of his thigh, tongue his balls, and the spot just behind them. Take your time--dont go up to his penis right away. After about a minute he should be going crazy. Then SLOWLY lick your way up his shaft. Take a full minute before you contact his head. At this point he should be excited out of his mind. Then, fully engulf his head in your mouth and gently suck while tonguing the underside of his penis where the head meets the shaft. Nice, firm steady rhythm. Use the back of your tongue to keep your throat closed because he'll be liable to have a massive orgasm at this point.
Good luck! Tell us how it goes! ;-)