You may not continue to post anxiety-driven follow-up comments about outlandish HIV transmission scenarios. I deleted the one about insect bites. If you post anything more, the entire thread will be deleted without reply.
As you suspect, there are no data by which to judge risk based on the details of oral sex. But even doubling an extremely low risk still means extremely low risk. You should not lose sleep over something like 1 in 5,000 versus 1 in 10,000.