A gay masseur put my erect penis into his mouth - only for 2 seconds, as I did not want him to continue. We then rubbed our penises against each other’s. The heads of our penises touched each other and possibly pre-ejaculation fluid was exchanged. There are no visible lesions on my penis. I could not see his and I do not know whether he is infected with HIV or has any STDs.
What is the risk of me being infected? Should I go a Post-Exposure Prophylaxis treatment (48 have not passed yet)? As I have a long-term relationship (and do not use a condom) with my girlfriend, should I abstain from sex with her until I get tested? In that case, for how long do I have to wait if I have to do an HIV test and/or test for other STDs?