The risk here is really low. Oral sex is lower risk than vaginal or anal sex, and given that it was so brief, that helps.
The risks are for gonorrhea, chlamydia, syphilis and genital herpes type 1, if you don't already have oral herpes type 1.
If you don't get any sores, discharge, or burning with urination in a few weeks, I wouldn't worry at all.