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Practice and frequent contact may help too. For example you can stop when you feel that the moment approaches, rest a little and then resume. Or you can keep yourself busy while she is doing it on you, for example do the same for her at the same time, although the outcome depends on how much you do enjoy giving oral pleasure to your girl (so the combination could "finish" you even earlier).
As I said, it is up to you to find your way. An understanding girl is very helpful in such situations.
You should get a little more control after some more experience. Also, if you make the PC muscles stronger that will help as well. To find that muscle, just stop the flow of urine while you are going pee. Work on contracting that muscle as often as possible. Trying not to think about it during helps as well, but I know that's difficult to do.
There are exercises which will help you last longer as well. Now there are devices which can do the exercises for you also. A really good solution is using the device in conjunction with the exercises for good results. That's what has helped me last longer with my wife.