You take a dick, make sure you squirt a little bit of lubricant in your hands, you don't want to hurt your guy, do you? Then, you slowly start running your fingers up and down his dick, making it bigger and bigger. Don't forget you can use both hands, and lightly massage his balls, some guys really love it too when you stick one of your fingers in his asshole, turns them on really good! When he's all stiff and really hard, then run your hands up and down his dick, sometimes make them fast strokes, sometimes go really slow... of course you'll want to use your mouth too, guys love blowjobs! When you're all finished, then it's your turn!