This is not a risk for HIV. Here is how HIV is transmitted in adults. By having unprotected vaginal or anal sex or sharing IV needles to inject drugs. You will not get HIV from breast milk. Air and saliva inactivate the virus.
Breast milk is only a risk for newborns, who do not have adequately developed immune systems. No adult has ever contracted HIV from breast milk.
Was there a penis in your anus during the sucking? No, so move on and probably also see a mental health therapist.