Hi and thanks for your question. Oral sex is considered to be very low risk for HIV transmission. There is a much higher risk of sexually transmitted infections like syphilis, gonorrhea and chlamydia being transmitted in the activity you described. If the three of you are planning to be sexual again, then having the conversation with each other about recent STI testing is recommended. Following through with each person testing on a regular basis can be reassuring to the individual and to the group. Hope this helps. Health Nurse