Hello and welcome to HCM.
Thank you for your query.
I have gone through your query, and the first and most important aspect of your query is your partners sexual and
HIV status. It seems as though the girl is a known person, and if you could, ask her about her HIV status.
The chances of you contracting HIV from the sexual act described above, is unlikely; even more as your partner's HIV status is unconfirmed. Only if your partner is HIV positive, can she transmit the infection to you. But I highly you will get HIV from the act performed. Do not worry.
I would also like to add, if your sexual partner is a known person, it is not considered rude to inquire about his/her sexual status and also about any infections they might have. It is better to be safe than sorry. Take care and be safe.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://doctor.healthcaremagic.com/doctors/dr-shoaib-khan/64581 . I would gladly help you.
Best wishes.