Sorry for late reply and inconvenience.
Thanks for all these additional information.
I understand your concern.
Well as you describe,chances of HIV transmission with protected oral sex in his case are 0.0001 % to zero.
As he had undergone HIV testing after 1 month so results are 95% conclusive.
Still I wouldn't recommend him to go for further testing with only history of protected oral sex.
He is absolutely safe.
He shouldn't worry at all.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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