Briefs de inmersión sin protección

Hello guys good day, last time i got an unusual encounter with a transwoman , the riskiest thing that we do is dipping briefly for 5-10s there is no full insertion but the thing is she put her penis into my anus for 5s then i remove it because there was no condom. there is no blood and there is no pre-C for sure. because all i do is only oral with condom. no more no less this one is only the riskiest i did so for in my entire life

am i infected with std? or Hiv? please help thanks should i test for stis?