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Hi there kindly answer following questions for further advice:
Age? Male or female?
Past medical history?
Any medicines using?
Smoking and alcohol?
Do you have any cuts in your mouth or penis?
Oral sex carries little to no risk for getting or transmitting HIV. The risk is very low, and much lower than with anal or vaginal sex.
I think you are fine. Next time use full protection
Stay calm. Best of luck