I should say that I share most of the advices given below with some exceptions, that depends on the knowledge you have of what things your boyfriend likes the most, for example I do not think anyone would like her girlfriend suddenly peek his ass, even in the event that if you are able to stimulate his prostate you will blow off his brain, on the other side biting hard a dick is something I wouldnt like to feel, massaging nuts with your hand, even squeezing a bit while you are sucking is great, and either the control of the tempo, I mean you can handle the times for example when he is about to cum you slow the rhythm, for the guy not to cum, and then increase it for about three times, you can perform it sucking and then hand jobing faster; and something I like much is to have my girl sucking while I am cumming till I finish, the body feeling is great but also the psichological factor of watching a beautiful girl doing it, I can say there are women able to do it perfect without dripping a bit of cum.