Thanks for using health care magic for posting your query.
I have gone through your given history in detail.
In your description yo have mentioned that you have had a sore throat
3 days after having oral sex
It could be a coincidence. But the other possibility is that you could be having an allergy
to penile secretions. As you have said that it has happened a second time, it is possible to be allergic in nature.
Infections can occur after oral sex. Penis has a lot of bacteria and you could get infected. You can try gargling after you are done with the act.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.