Hello, Help. I am not an expert, rather more of a facilitator here. The odds of oral transmission you described are very slight:
http://www.goaskalice.columbia.edu/1047.htmlI would also venture an opinion that if the anal sex was with properly used condums, that your risk is also very low. Of course, it is possible to use condums improperly and increase risk of infection. This is a good read;
http://www.thebody.com/cdc/factcond.htmlMy guess is that your risk of infection is very low.
best wishes,
Willy