Recently I went to a massage place. After the usual massage, the girl asked me if I wanted extras and also offered sex which I categorically refused. She then offered a body-to-body massage which I accepted, however to my surprise she opened all her clothes including underwear. She lay down beside me and I sucked her nipples for a bit and then she stroked my penis a little. All this while I was careful not to touch her vagina with my fingers.
Then she offered that I rub my penis between her thighs which I foolishly agreed but remember that I was looking at the lower portion of her thighs and aiming to do it there as I am generally very careful (even paranoid) about HIV. I was on top of her and then ejaculated between her thighs. I do not believe I touched her Vagina with my penis as I way low down on her. I further do remember checking where the semen was on the thighs (did not see any near her Vagina) and even asking her if I touched her Vagina (The answer is now a bit muddled in my head but I believe she said no.)
Since then paranoia has gripped me with several what-if questions especially since she was fully naked. Please let me know if there is any risk at all. If I had at all penetrated her, I would know, right? I was not drunk at that time. I am in a country where testing is not easy and even can lead to trouble so do not want to test unless necessary. Your help is much appreciated.