Based on the available database, there has not been even a single case of HIV transmission via oral sex alone, in the history of HIV/AIDS spread over 3 decades and involving tens of million infected people to date.
You may find at some websites (like CDC) oral sex a "low risk" activity, which in my opinion, a theoretical risk where probability is negligible. Here all the knowledgeable answerers believe that oral sex has no risk of HIV transmission.
thanks for yr reply. just to reconfirm yr answer remains the same on the specific situation listed above ?
Yes. Oral sex is practically no HIV risk, no matter what.