Men love oral sex in general. Few are those who do not want their lovers to satisfy them this way - but many women do it because they "have to " and not because they want or like it and so on. And when sex becomes a chore, the passion lacking and when the passion is lacking you better do anything else.
First, you need to relax and let the stress and tension away. If you can not think of pleasant things, then do not think about anything and just concentrate on what you do. Further, drink something before you start the oral sex for your mouth to be as wet as possible so that he can feel as much pleasure as possible- the more you use saliva, the better he will feel.
Grab with one hand the base of the penis and make slight circular moves on the surface of his "member" . At first you move the hand on the head slowly, but grow in intensity along with his moans of pleasure. If he is not the kind of man who makes sounds when he feels good, you can take a look to his mimic, but do not stare.
With the other hand you can stimulate his testicles. You can grab them in your hand and easily caress them, or if you find difficult to do many things at once, you can just hold them in your hand without squeezing.
Deep throat, or when the penis goes deep into the mouth all the way to the neck - most women can not do that because they are tense or afraid they will choke. If you want to try it, you need to relax and not to push yourself if you see that it does not work. If you do not feel comfortable, you better not try it.
After you've played a lot with his gland and he is very excited, you can stimulate his penis with your hand while you kiss and lick balls with your tongue. Play with them until you feel that your boyfriend is going crazy of too much pleasure ...
And when he feels he can not handle it anymore, take him to ecstasy. For this you will need to find a fast rhythm and coordinate your hand and head movements, so that you go with both in one direction at a time. In the end, you have a choice: either he ejaculates in your mouth - most men love to do that - either you swallow or spit, or ask him to let you know when he will let it go, not take you by surprise.