Hope you enjoyed yourself and sorry that you then have worry after. A happy ending massage is not a risk for HIV. HIV, for reference, is only transmitted in specific ways that include unprotected vaginal or anal sex or sharing of IV drug needles. It takes place inside the body. Air inactivates the virus. So, something like a hand is not going to transmit the virus outside the body. Even if she had lesions or warts, you would not be at risk. So, please do not worry about HIV. As to other std's, this also would be very unlikely. Here is an older thread by a MedHelp expert doctor in which he states "There is no std risk from hand jobs". https://www.medhelp.org/posts/STDs/STD-risk-in-recieving-handjob/show/1708925
Hope that alleviates your worries.