Lead him in to the bedroom telling him that you have a very special surprise for him and that it will be something he will always remember. You will most probably have given your man many blow jobs before and will be quite comfortable to take his cum in your mouth and swallow it and also, know exactly which point of your stimulation brings him to his point of no return. Sit on the edge of the bed with him and reach over for a couple of pillows. Push him on to his back and place the pillows under his head making sure that his head is tipped slightly forward so that he can observe everything you are doing. Remove his trousers and underwear. Part his legs and approach his cock from below with your mouth slightly open and your tongue licking your top and bottom lips until they are really wet. Tell him that he is about to receive the best blow job of his life and that he should just relax and let you take control of the situation. He should already have at least a semi hard on at this stage so take his cock in your hand and very slowly start to wank him, bring your wet lips close to his cock and do full, slow strokes so that the corona is exposed from his foreskin on the downward stroke and it is fully covered on the upward stroke.
Don't be shy and encourage him to watch you playing with his cock, any man loves to see his cock disappear deep into a woman's mouth. This will be one of the most erotic scenes either of you will ever experience. Occasionally, pause the downward stroke long enough to give the corona a long lick with your wet tongue. Look up to see the response on his face each time your tongue touches different parts of his cock and let him see that you are wanting him to enjoy every minute of it. Close your eyes down to a slit and make erotic facial gestures. No man can stay soft under these circumstances, especially in anticipation of what you have made clear that you are going to do for him next. Anticipation and teasing are all part of giving tremendous oral sex but don't spend too much time in this area or his cock may stop responding and could even go limp on you. Once you have started to wank and lick his cock, it will obviously become very hard and swollen. Gaze into his eyes lovingly and open your mouth fairly wide, then slowly take his cock as deep into your mouth as possible, hold this moment for as long as you feel is right then very slowly pull back until his cock is just at the tip of your lips. Pull down on his foreskin as far as you can to reveal his corona.