There are exercises you can do to strengthen yourself up and withold your orgasm allowing you to go longer ..

You should see a sex therapist about this it could be easily what you’re thinking at the time

You could try useing a cock ring to sustain your erection

I would highly suggest on working on your "eating out" skillz …

some women get annoyed easily .. some find it normal … some are used to it ..some women do get mad that the guy gets off and doesn’t finish the job …

but remember all women are different so they wont all react the same way ..everyone has had different experiances in life.

one last thing off the top of my head .. You could masturbate before you have sex .. this way it will take you longer to reach orgasm the second time