Water ejaculation, please help!!

Patient: SOS!While recieving oral sex from my girlfriend, I came and she continued. Then I thought it was over but suddenly I ejaculated something like water in a really big amount (about 100g). It was not urine because it did not smell or taste like this, it was not sperm because it was clear and not sticky.I know that it is not normal and I never heard about something like this, so please answer me as soon as you can.Thank you,Juliano

Doctor: