While giving a blowjob, take it slow. Rushing him any time during the act will only give him the impression that you want to be done with him as soon as possible, pressuring him into finishing quickly and making him less able to enjoy the moment; it could even kill his arousal. Just enjoy every second you share together. Don’t worry about how much time has passed since you started. Don’t focus on making him cum. A blowjob is all about how you get him there; just concentrate on his pleasure, on licking, sucking and kissing every part of him and exploring all the ways to make him tick. If you find yourself getting tired, try different techniques. Use your hands, your fingers. Stop here and there, take a few seconds to show him your body. Look into his eyes, move and tease him. Make it last!